CN112986539B - Coal-series graphite mineral resource grading evaluation method - Google Patents

Coal-series graphite mineral resource grading evaluation method Download PDF

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CN112986539B
CN112986539B CN202110515037.8A CN202110515037A CN112986539B CN 112986539 B CN112986539 B CN 112986539B CN 202110515037 A CN202110515037 A CN 202110515037A CN 112986539 B CN112986539 B CN 112986539B
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graphite
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刘亢
宁树正
曹代勇
黄少青
张莉
邹卓
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General Survey and Research Institute of China Coal Geology Bureau
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Abstract

The invention relates to a coal-series graphite mineral resource grading evaluation method, which comprises the steps of identifying the type of coal-series graphite and evaluating the coal-series graphite resource; the identification of the coal-based graphite type comprises the following steps: collecting a coal rock sample from a coal mine area, and detecting the coal rock sample; grading and identifying the coal rock sample according to the detection result data and the predetermined evaluation standard of each category of coal-series graphite; the evaluation of the coal-based graphite resource comprises the following steps: testing the coal rock sample; and comparing the test result data with the evaluation standards of the predetermined working degree, geological conditions and mineral conditions, and evaluating the coal-series graphite.

Description

Coal-series graphite mineral resource grading evaluation method
Technical Field
The invention belongs to the technical field of coal-based graphite resource evaluation, and particularly relates to a coal-based graphite mineral resource grading evaluation method.
Background
Graphite belongs to new strategic mineral products and is widely applied to the fields of refractory materials, energy storage and conductive materials, nuclear industry, military aerospace, new energy automobiles and the like. In the national mineral resource planning (2016-2020), 24 mineral products such as graphite are listed as strategic mineral products for the first time, and graphite is listed as one of 35 key minerals in 2018 in the United states.
Graphite can be divided into two major categories, crystalline graphite and aphanitic graphite (coal-based graphite). According to the data display of the China Association for non-metallic mineral industries, by the end of 2018, the resource reserve of crystalline graphite deposits (points) in China is found to be 4.37 hundred million tons; the resource reserve of 1.00 million tons is found out from the ore deposit (point) of the cryptocrystalline graphite (coal-based graphite). In fact, due to the lack of scientific indexes for identifying coal-based graphite, about half of the coal-based graphite is mixed with anthracite for use, and therefore, the resource reserves of the existing coal-based graphite can be greatly underestimated.
Coal-based graphite, also known as coal-formed graphite, is the main type of cryptocrystalline graphite and is the product of coal deterioration caused by thermal contact with magma and structural dynamic deterioration. China coal-series graphite ores are mainly distributed in Hunan, Guangdong, Fujian and other places, the graphite grade of a plurality of large-scale graphite ore bases is above 70% at the lowest, the average graphite grade is about 80%, the mined graphite resources can be directly exported basically without mineral separation, and the method has strong competitiveness in the international market. Compared with crystalline graphite, the coal-based graphite has the characteristics of concentrated ore body, high grade, easy development and the like.
However, no index and evaluation standard for identifying coal-based graphite exists so far, and the mining administration is not based on the index, so that the discovered coal-based graphite mineral is difficult to be recognized, the positivity of exploration of the coal-based graphite mineral resources is inhibited, and even part of mines use the coal-based graphite as coal for mining and utilization, so that the strategic resources are greatly wasted.
Disclosure of Invention
Aiming at the problems, the invention provides a coal-based graphite mineral resource grading evaluation method which can enhance the strategic guarantee capability of the graphite requirement in China, improve the reasonable development and utilization degree of the coal-based mineral resource and promote the repeated conversion of coal from single fuel to fuel and industrial raw materials.
The coal-series graphite mineral resource grading evaluation method comprises the steps of identifying the type of the coal-series graphite and evaluating the coal-series graphite resource;
the identification of the coal-based graphite type comprises the following steps: collecting a coal rock sample from a coal mine area, and detecting the coal rock sample;
grading and identifying the coal rock sample according to the detection result data and the predetermined evaluation standard of each category of coal-series graphite;
the evaluation of the coal-based graphite resource comprises the following steps: testing the coal rock sample;
and comparing the test result data with the evaluation standards of the predetermined working degree, geological conditions and mineral conditions, and evaluating the coal-series graphite.
Optionally, the collecting the coal rock sample from the coal mining area includes: and collecting coal rock samples from the coal seam, the gangue and the coal seam top and bottom plate of the coal mine area.
Optionally, the various classes of coal-based graphite include graphite, semi-graphite, and graphitized anthracite.
Optionally, the classifying and identifying the coal rock sample according to the detection result data and predetermined evaluation criteria of each category of coal-series graphite includes:
determining the evaluation standard of the composition parameters according to the predetermined classification of vitrinite reflectivity, the classification of volatile component yield and the classification of hydrogen-carbon element ratio;
and determining the evaluation standard of the structural parameters according to the predetermined grading of the carbon layer spacing and the grading of the structural defect parameters.
Optionally, the comparing the test result data with the predetermined evaluation criteria of the working degree, the geological condition and the mineral condition to evaluate the coal-series graphite includes:
determining an evaluation standard of the working degree according to the predetermined classification of the density of the sampling points;
determining an evaluation standard of geological conditions according to a predetermined standard of structural deformation strength, a predetermined standard of structural stress, a predetermined standard of rock mass scale and thermal action strength and a predetermined standard of rock mass and coal seam distance;
and determining the evaluation standard of mineral conditions according to the evaluation standard of the composition parameters and the evaluation standard of the structure parameters.
Optionally, the vitrinite reflectance is graded as follows: less than 5.5%, 5.5-6.5%, 6.5-7.5% and more than 7.5%.
Optionally, the volatile yield is graded as: less than 3.8%, 3.8-4.5%, 4.5-6.5% and more than 6.5%.
Optionally, the grading of the hydrogen-carbon element ratio is as follows: less than 0.1, 0.1-0.15, 0.15-0.2 and more than 0.2.
Optionally, the grading of the carbon layer spacing is as follows: 0.3354-0.3370, 0.3370-0.3440 and > 0.3440.
Optionally, the structural defect parameters are classified as: less than or equal to 0.60, 0.60-0.65, 0.65-0.70 and more than 0.70.
Optionally, the classification of the density of the sampling points comprises <3, 3-6 and ≧ 6.
Optionally, the standard of the structural deformation strength is as follows: the structural complexity is divided into three stages: simple, medium, complex; simple criteria are: the ore body (layer) is monoclinic or wide-faced and anticline, and has no fracture structure and vein rock; the medium criteria are: the ore body (layer) has the next-level flexure or local compact flexure, and has fracture and vein rock cutting; the complex criteria are: faults, ruffles or vein rocks develop and the ore body (layer) is severely damaged.
Optionally, the construction stress criteria are: less than 20MPa, 20-30MPa and more than 30 MPa.
Optionally, the standards of the rock mass scale and the thermal action strength are as follows: the method is divided into three stages according to rock mass properties: (1) invasion of dikes, cliffs and bedrock; (2) invasion of acidic and medium-acidic rock bases and rock strains; (3) an invasion of acidic granite or neutral acidic amphibole.
Optionally, the standard of the distance between the rock mass and the coal seam is as follows: more than 10km, 3-10km, 1-3 km.
Identifying coal and coal-based graphite according to the composition parameters and the structural parameters of the coal rock sample, and dividing the graphitization grade of the coal-based graphite; the graphitization grade is divided into I grade and II grade1Stage II2Grade I is graphite, grade II1Stage and II2The grade III corresponds to graphitized anthracite, and the rest is coal;
optionally, in the identification of the type of the coal-based graphite, the composition parameters include vitrinite reflectance (Romax), volatile yield (Vdaf) and hydrogen-carbon element ratio (H/C), and the composition parameters are used for evaluating the quality of the coal and the coal-based graphite based on material composition differences and can also be used for initially distinguishing the coal and the coal-based graphite in a resource exploration phase. The structural parameter comprises a carbon layer spacing (d)002) And structural defect parameter (R)2) The method is used for accurately identifying the coal-based graphite and determining the graphitization degree of the coal-based graphite according to the structural order degree.
The resource evaluation index system of the coal-series graphite in the coal is established by evaluating the coal-series graphite resources, the resource evaluation index system comprises a condition level and an index level, and the condition level comprises a working degree, a geological condition and a mineral condition; the index hierarchy includes seven indices.
The working degree comprises indexes of sampling point density, the geological conditions comprise four indexes of structural deformation strength, structural stress, rock mass scale and thermal action strength and rock mass and coal bed distance, and the mineral conditions comprise two indexes of structural parameters and component parameters.
The evaluation of the coal-series graphite resource is respectively provided with corresponding index preset values and weight values for the seven indexes; respectively comparing the actual data of the coal rock sample with corresponding index preset values, taking corresponding numerical values according to comparison results, and multiplying the taken numerical values by the weight values of the corresponding indexes to obtain evaluation values of the corresponding indexes;
adding the evaluation values of all indexes belonging to the same condition to obtain the evaluation value of the condition;
and the three conditions of the condition level are respectively provided with corresponding preset ranges, the evaluation values of different conditions fall into the corresponding preset ranges respectively, the coal mine area is graded, and corresponding development strategies are adopted according to the grading.
Optionally, the specific method for comparing the actual data of the coal rock sample with the corresponding index preset values respectively and taking corresponding values according to the comparison result includes: after the actual values of the seven indexes are compared with the preset values, when the values are taken, the preset values are used as horizontal coordinates and the boundary values of the value ranges are used as vertical coordinates in the determined value ranges, when the data are less than two groups, the data are complemented by 0, a fitting straight line is drawn, then the actual values are used as the horizontal coordinates and are substituted into the equation of the obtained fitting straight line, and the corresponding values are obtained through calculation; and when the value is [0.8,1.0), the value obtained by calculation is more than 1, and the value is 1.
Optionally, the working degree is provided with two preset ranges, namely (0,0.6) and [0.6, 1.0); the evaluation value of the working degree falls in the range of (0,0.6), which indicates that the working degree is poor, the sampling points are few, the obtained data representativeness of other six indexes is insufficient, and the sampling points are increased; the evaluation value of the degree of operation falls within the range of [0.6,1.0), indicating that the degree of operation is acceptable.
Optionally, the geological condition has three preset ranges, namely (0,0.6), (0.6,0.8) and (0.8, 1.0); the evaluation value of the geological condition falls in the range of (0,0.6), which indicates that the geological condition of the coal-series graphite is poor and the mining difficulty is high; the evaluation value of the geological condition falls in the range of [0.6,0.8), which indicates that the geological condition of the coal-series graphite is moderate and the mining difficulty is moderate; the evaluation value of the geological conditions falls within the range of [0.8,1.0 ], which indicates that the geological conditions of the coal-series graphite are good and the mining difficulty is low.
Optionally, the mineral conditions are provided with three preset ranges, namely (0,1.56), [1.56,2.08), and [2.08, 2.6); the evaluation value of mineral conditions falls within the range of (0,1.56), indicating that the development resource is graphitized anthracite, and is rated as grade III; the evaluation value of mineral conditions falls within the range of [1.56,2.08), indicating that the development resource is semi-graphite and is rated as class II; the evaluation value of mineral conditions falls within the range of [2.08,2.6), indicating that the development resource is graphite and is rated as class I.
According to the coal-based graphite mineral resource grading evaluation method, firstly, graphite resources in coal are identified, coal and coal-based graphite are distinguished, then, graphite, semi-graphite and graphitized anthracite in the coal-based graphite are further distinguished through grading of the coal-based graphite, and accordingly, technicians in the field can conveniently make different development strategies aiming at coal-based graphite with different qualities. Specifically, the two types of parameters, namely the component parameters and the structural parameters, which can reflect the difference between coal and coal-based graphite and the different qualities of the coal-based graphite most, are selected, so that the coal-based graphite can be identified more accurately and conveniently.
According to the evaluation of the coal-based graphite resource, on the basis of the identification of the coal-based graphite type, condition levels and subordinate index levels are designed, an evaluation index system which is suitable for coal mine exploration and is beneficial to representing the coal-based graphite in coal is established, and the comprehensive evaluation of the coal-based graphite in coal is realized. The working degree is the basis of the evaluation of the coal-based graphite in the coal, and the credibility of the evaluation result is increased along with the improvement of the working degree; the sampling point density can simply and visually reflect the working degree. The geological conditions consider the influence factors of coal-series graphite mineralization and development and utilization scale, four indexes of structural deformation strength, structural stress, rock mass scale and thermal action strength and distance between a rock mass and a coal bed are selected, and the geological conditions of the coal-series graphite are scientifically and reasonably represented from the principle of coal-series graphite mineralization. The mineral product conditions are main parameters for calculating the coal-based graphite resource amount of the evaluation unit, and determine the economic value and the development benefit of the coal-based graphite mineral product.
Detailed Description
The embodiment provides a coal-series graphite mineral resource grading evaluation method, which comprises the steps of identifying the type of coal-series graphite and evaluating the coal-series graphite resource;
the identification of the coal-based graphite type comprises the following steps: collecting a coal rock sample from a coal mine area, and detecting the coal rock sample;
grading and identifying the coal rock sample according to the detection result data and the predetermined evaluation standard of each category of coal-series graphite;
the evaluation of the coal-based graphite resource comprises the following steps: testing the coal rock sample;
and comparing the test result data with the evaluation standards of the predetermined working degree, geological conditions and mineral conditions, and evaluating the coal-series graphite.
Optionally, the collecting the coal rock sample from the coal mining area includes: and collecting coal rock samples from the coal seam, the gangue and the coal seam top and bottom plate of the coal mine area.
Optionally, the various classes of coal-based graphite include graphite, semi-graphite, and graphitized anthracite.
Optionally, the classifying and identifying the coal rock sample according to the detection result data and predetermined evaluation criteria of each category of coal-series graphite includes:
determining the evaluation standard of the composition parameters according to the predetermined classification of vitrinite reflectivity, the classification of volatile component yield and the classification of hydrogen-carbon element ratio;
and determining the evaluation standard of the structural parameters according to the predetermined grading of the carbon layer spacing and the grading of the structural defect parameters.
Optionally, the comparing the test result data with the predetermined evaluation criteria of the working degree, the geological condition and the mineral condition to evaluate the coal-series graphite includes:
determining an evaluation standard of the working degree according to the predetermined classification of the density of the sampling points;
determining an evaluation standard of geological conditions according to a predetermined standard of structural deformation strength, a predetermined standard of structural stress, a predetermined standard of rock mass scale and thermal action strength and a predetermined standard of rock mass and coal seam distance;
and determining the evaluation standard of mineral conditions according to the evaluation standard of the composition parameters and the evaluation standard of the structure parameters.
Optionally, the vitrinite reflectance is graded as follows: less than 5.5%, 5.5-6.5%, 6.5-7.5% and more than 7.5%.
Optionally, the volatile yield is graded as: less than 3.8%, 3.8-4.5%, 4.5-6.5% and more than 6.5%.
Optionally, the grading of the hydrogen-carbon element ratio is as follows: less than 0.1, 0.1-0.15, 0.15-0.2 and more than 0.2.
Optionally, the grading of the carbon layer spacing is as follows: 0.3354-0.3370, 0.3370-0.3440 and > 0.3440.
Optionally, the structural defect parameters are classified as: less than or equal to 0.60, 0.60-0.65, 0.65-0.70 and more than 0.70.
Optionally, the classification of the density of the sampling points comprises <3, 3-6 and ≧ 6.
Optionally, the standard of the structural deformation strength is as follows: the structural complexity is divided into three stages: simple, medium, complex; simple criteria are: the ore body (layer) is monoclinic or simple wide and oblique, has no fracture structure and vein rock, and has little influence on the shape of the ore body; the medium criteria are: the ore body (layer) has secondary first-order flexure or local compact flexure, has fracture and vein rock cutting, and has certain influence on the shape of the ore body (layer); the complex criteria are: faults, ruffles or vein rocks develop and the ore body (layer) is severely damaged.
And judging the structural complexity by referring to DZ/T0326-2018 & lt geological survey standards of graphite and muscovite minerals.
Optionally, the construction stress criteria are: less than 20MPa, 20-30MPa and more than 30 MPa.
Optionally, the standards of the rock mass scale and the thermal action strength are as follows: the method is divided into three stages according to rock mass properties and thermal action time: (1) the invasion of the dikes, the rock walls and the bedrock, and the heat action time is short; (2) the invasion of acid and medium acid rock bases and rock strains, and the action time of heat is longer; (3) large-scale invasion of acid granite or neutral acid amphibole, sufficient heat and long action time.
Optionally, the standard of the distance between the rock mass and the coal seam is as follows: more than 10km, 3-10km, direct contact, contact metamorphic-deformation belt width 1-3 km.
Identifying coal and coal-based graphite according to the composition parameters and the structural parameters of the coal rock sample, and dividing the graphitization grade of the coal-based graphite; the graphitization grade is divided into I grade and II grade1Stage II2Grade I is graphite, grade II1Stage and II2The grade III corresponds to graphitized anthracite, and the rest is coal;
and evaluating the coal-based graphite resource according to the working degree, geological conditions and mineral conditions of the coal mining area, and evaluating the resource quantity of the coal-based graphite.
Optionally, in the identification of the type of the coal-based graphite, the composition parameters include vitrinite reflectance (Romax), volatile yield (Vdaf) and hydrogen-carbon element ratio (H/C), and the composition parameters are used for evaluating the quality of the coal and the coal-based graphite based on material composition differences and can also be used for initially distinguishing the coal and the coal-based graphite in a resource exploration phase. The structural parameter comprises a carbon layer spacing (d)002) And structural defect parameter (R)2) The method is used for accurately identifying the coal-based graphite and determining the graphitization degree of the coal-based graphite according to the structural order degree.
Optionally, the carbon layer spacing is analyzed using X-ray diffraction, and the structural defect parameters are characterized by raman spectroscopy.
The vitrinite reflectance is a parameter reflecting the degree of coal deterioration, and the inventor summarizes and analyzes the difference of coal and coal-based graphite in vitrinite reflectance according to the long-term research result of the skilled in the art on the coal-based graphite, and sets a reasonable identification range of vitrinite reflectance of different types of coal, coal-based graphite and coal-based graphite.
Optionally, as shown in table 1, the vitrinite reflectance is provided with a first preset value, a second preset value and a third preset value, and when the vitrinite reflectance of the sample is smaller than the first preset value, the sample is identified as coal; when the reflectivity of the sample vitrinite body is not less than a first preset value and less than a second preset value, the sample is identified as grade III, and the grade III corresponds to the graphitized anthracite; when the reflectivity of the sample vitrinite is not less than the second preset value and not more than the third preset value, the sample is identified as II grade and corresponds to the half graphite; and when the reflectivity of the sample vitrinite is greater than a third preset value, the sample is identified as belonging to I grade and corresponds to graphite.
Optionally, the first preset value is 5.5%, the second preset value is 6.5%, and the third preset value is 7.5%.
The volatile yield is a parameter reflecting the degree of deterioration, the graphitization is the continuation of the coalification, the evolution is substantial, and the element change shows carbon enrichment, dehydrogenation and deoxidation, and the molecular arrangement shows ordering enhancement. The invention specifies the volatile matter yield V by analyzing the volatile matter data of coal and coal-based graphite of a large number of literature and research examplesdafLess than or equal to 6.5 percent and is used as the boundary grade of the coal-series graphite.
Optionally, the volatile component yield is provided with a fourth preset value, a fifth preset value and a sixth preset value, when the volatile component yield of the sample is smaller than the fourth preset value, the sample is identified as grade I, and grade I corresponds to graphite; when the volatile component yield of the sample is not less than a fourth preset value and not more than a fifth preset value, the sample is identified as II grade, and the II grade corresponds to the half graphite; when the volatile component yield of the sample is greater than a fifth preset value and not greater than a sixth preset value, the sample is identified as grade III, and the grade III corresponds to the graphitized anthracite; and when the volatile content yield of the sample is greater than the sixth preset value, the sample is identified as the coal.
Optionally, the fourth preset value is 3.8%, the fifth preset value is 4.5%, and the sixth preset value is 6.5%.
The hydrogen-carbon element ratio reflects the enrichment degree of carbon elements and is a good index for evaluating the graphitization degree.
Optionally, the hydrogen-carbon element ratio is provided with a seventh preset value, an eighth preset value and a ninth preset value, when the hydrogen-carbon element ratio of the sample is smaller than the seventh preset value, the sample is identified as grade I, and grade I corresponds to graphite; when the hydrogen-carbon element ratio of the sample is not less than the seventh preset value and less than the eighth preset value, the sample is identified as II grade, and the II grade corresponds to the half graphite; when the hydrogen-carbon element ratio of the sample is not less than the eighth preset value and not more than the ninth preset value, the sample is identified as grade III, and the grade III corresponds to the graphitized anthracite; and when the hydrogen-carbon element ratio of the sample is greater than the ninth preset value, the sample is identified as coal.
Optionally, the seventh preset value is 0.1, the eighth preset value is 0.15, and the ninth preset value is 0.2.
XRD analysis of the graphite showed that d002The peak is the strongest peak, which represents the lattice spacing d002Reflecting the degree of crystallinity of the graphite sheet, the carbon layer spacing is of great significance in evaluating coal-based graphite. In combination with the following identification method, the invention specifies a carbon layer spacing of 3.44 a as the boundary grade of the coal-based graphite.
Optionally, the distance between the carbon layers is provided with a 10 th preset value, an 11 th preset value and a 12 th preset value, when the distance between the carbon layers of the sample is not less than the 10 th preset value and not more than the 11 th preset value, the sample is identified as a grade I, and the grade I corresponds to graphite; when the distance between the carbon layers of the sample is greater than the 11 th preset value and not greater than the 12 th preset value, the sample is identified as II grade, and the II grade corresponds to the half graphite; and when the spacing between the carbon layers of the sample is greater than the 12 th preset value, the sample is identified as III-grade and above III-grade, and corresponds to graphitized anthracite and coal.
Optionally, the 10 th preset value is 0.3354, the 11 th preset value is 0.3370, and the 12 th preset value is 0.3440.
Therefore, graphitized anthracite and coal cannot be distinguished only by virtue of the carbon layer spacing, and other structural parameters are required to be set for auxiliary identification.
At present, the intensity ratio R is an index often adopted for evaluating coal-based graphite by using Raman spectrum1= ID/(ID + IG) and area ratio R2= AD/(AD + AG), wherein ID and IG are a D peak (structural defect peak of graphite) and a G peak (sp 2 carbon atom) respectivelyIn-plane vibration peak of (1), AD and AG are the areas of the D peak and the G peak, respectively, but since the half widths of the D peak and the G peak are often greatly different, the present invention employs R2The coal-based graphite evaluation is more accurate. In combination with the following identification method, the invention specifies the structural defect parameter as 0.70, which is taken as the boundary grade of the coal-based graphite.
Optionally, the structural defect parameter is provided with a 13 th preset value, a 14 th preset value and a 15 th preset value, when the structural defect parameter of the sample is not greater than the 13 th preset value, the sample is identified as a grade I, and the grade I corresponds to graphite; when the structural defect parameter of the sample is more than the 13 th preset value and not more than the 14 th preset value, the sample is identified as II1A stage; when the structural defect parameter of the sample is greater than the 14 th preset value, the sample is identified as II2A stage; when the structural defect parameters of the sample are not less than the 14 th preset value and not more than the 15 th preset value, the sample is identified as grade III, and the grade III corresponds to the graphitized anthracite; and when the structural defect parameter of the sample is greater than the 15 th preset value, the sample is identified as coal.
Optionally, the 13 th preset value is 0.6, the 14 th preset value is 0.65, and the 15 th preset value is 0.7.
It can be seen that II2The range of structural defect parameters of grade III and grade III overlap, and experiments show that the structural defect parameter is 0.65 as a boundary in the semi-graphite, and II1Stage and II2Stages have different qualities, so stage II should be further divided into II1Stage and II2And (4) stages. As for II2The identification of grade and III can be assisted by the spacing between carbon layers and composition parameters.
Figure 456791DEST_PATH_IMAGE001
By the method for identifying the type of the coal-based graphite, the coal-based graphite is divided into three stages. The grade I graphite has higher structural order degree, larger size development of a carbon layer, complete disappearance of organic components of coal, conversion of the organic components into graphite components such as granular graphite components, filamentous graphite components and the like, and has the physical and chemical properties of typical graphite minerals. Semi-graphite grade II, wherein II1The spacing between the carbon layers is relatively small, and the structural order degree is relatively highHigh, the microscopic component is mainly granular graphite component; II2And the graphite carbon layer has smaller spacing, but relatively more structural defects, and has partial graphite ore characteristics. The grade III graphitized anthracite has relatively poor graphitization degree, disordered long-range carbon layer, but good conductivity and thermal stability, can be used as a low-end industrial raw material, and has certain practical value.
The identification of the coal-series graphite type finds the method for identifying the coal and the coal-series graphite by analyzing the components and the structural characteristics of the coal and the coal-series graphite and grades the coal-series graphite, greatly enriches the evaluation theoretical system of the coal-series graphite and provides a basis for actual mining and industrial application. In addition, the component parameters and the structural parameters are matched and supplemented with each other, so that a set of complete identification system and method is formed, and the practical operation, popularization and application are facilitated.
The resource evaluation index system of the coal-series graphite in the coal is established by evaluating the coal-series graphite resources, the resource evaluation index system comprises a condition level and an index level, and the condition level comprises a working degree, a geological condition and a mineral condition; the index hierarchy includes seven indices.
The working degree comprises indexes of sampling point density, the geological conditions comprise four indexes of structural deformation strength, structural stress, rock mass scale and thermal action strength and rock mass and coal bed distance, and the mineral conditions comprise two indexes of structural parameters and component parameters.
The evaluation of the coal-series graphite resource is respectively provided with corresponding index preset values and weight values for the seven indexes; comparing the actual data of the sample with corresponding index preset values respectively, taking corresponding numerical values according to comparison results, and multiplying the taken numerical values by the weight values of the corresponding indexes to obtain evaluation values of the corresponding indexes;
adding the evaluation values of all indexes belonging to the same condition to obtain the evaluation value of the condition;
and the three conditions of the condition level are respectively provided with corresponding preset ranges, the evaluation values of different conditions fall into the corresponding preset ranges respectively, the coal mine area is graded, and corresponding development strategies are adopted according to the grading.
Optionally, as shown in table 2, the density of the sampling point is provided with a 16 th preset value and a 17 th preset value, and when the density of the actual sampling point is less than the 16 th preset value, the value range corresponding to the density index of the sampling point is (0, 0.6); when the density of the actual sampling point is not less than the 16 th preset value and less than the 17 th preset value, the value range corresponding to the density index of the sampling point is [0.6,0.8 ]; and when the density of the actual sampling point is not less than the 17 th preset value, the value range corresponding to the density index of the sampling point is [0.8,1.0 ].
Optionally, the 16 th preset value is 3 points/km2The 17 th preset value is 6 points/km2。
Optionally, the weight value corresponding to the density of the sampling point is 1.
Optionally, when the structural deformation strength of the sample is judged to be simple, the value corresponding to the structural deformation strength index is 0.6; when the structural deformation strength of the sample is judged to be moderate, the value corresponding to the structural deformation strength index is 0.8; when the structural deformation strength of the sample is judged to be complex, the value corresponding to the structural deformation strength index is 1.0.
Optionally, the weight value corresponding to the structural deformation strength is 0.3.
Optionally, the structural stress is provided with an 18 th preset value and a 19 th preset value, and when the structural stress of the sample is smaller than the 18 th preset value, the value range corresponding to the structural stress index is (0, 0.6); when the structural stress of the sample is not less than the 18 th preset value and not more than the 19 th preset value, the value range corresponding to the structural stress index is [0.6,0.8 ]; and when the structural stress of the sample is greater than the 19 th preset value, the value range corresponding to the structural stress index is [0.8,1.0 ].
Optionally, the 18 th preset value is 20MPa, and the 19 th preset value is 30 MPa.
Optionally, the weight value corresponding to the construction stress is 0.2.
Optionally, the tectonic stress of the sample is an average value of the tectonic stresses of all sampling points, and the tectonic stress is calculated as follows:
Figure 505387DEST_PATH_IMAGE002
wherein the content of the first and second substances,
Figure 91089DEST_PATH_IMAGE003
(in Mp) is differential stress and D (in microns) is sample particle diameter; a and m are constants, m =0.68, the value of A is different according to different rock mass types of samples, and A =5.56 when the samples are quartz; when the sample is olivine, a = 14.6; when the sample was calcite, a = 7.5; when the sample was anorthite, a = 7.8.
According to the classification of the cause types of graphite ore deposits of graphite and crushed mica mineral geological survey regulations, coal-series graphite belongs to a contact metamorphic type, the contact metamorphic action decomposes carbon (coal), and the carbon is re-enriched to form graphite ore mainly containing cryptocrystalline substances (earthy substances). The quality and scale of the ore are closely related to the contact deterioration, and the graphite is produced in layers. Namely, the coal-series graphite is formed by the contact and deterioration of rock slurry entering a coal bed, and the properties of the rock mass are generally related to acid or medium-acid rock mass such as a rock base and a rock strain. The acidic magma has low consistency and good fluidity, is beneficial to heat transfer, and meanwhile, the magma is rich in volatile gases containing fluorine, boron and the like, plays the role of a catalyst and a fluxing agent, and is beneficial to the conversion of carbon into graphite. Therefore, the invention sets the indexes of rock mass scale and thermal action strength to evaluate the coal-series graphite.
Optionally, when the sample rock mass is judged to be the invasion of the dike, the rock wall and the bedrock, the value range of the rock mass scale corresponding to the thermal action strength index is 0.6; when the sample rock mass is judged to be invaded by acidic and medium-acidic rock foundations and rock strains, the value range of the rock mass scale corresponding to the thermal action strength index is 0.8; when the sample rock mass is judged to be invaded by large-scale acid granite or medium acid amphibole, the value range of the rock mass scale corresponding to the thermal action strength index is 1.0.
Optionally, the weight value of the rock mass scale corresponding to the thermal action strength is 0.3.
The sample rock mass can be judged by adopting an observation method.
Optionally, the distance between the rock mass and the coal seam is provided with a 20 th preset value and a 21 st preset value, and when the actual distance between the rock mass and the coal seam is greater than the 20 th preset value, the value range corresponding to the distance index between the rock mass and the coal seam is (0, 0.6); when the actual distance between the rock mass and the coal seam is not more than the 20 th preset value and is more than the 21 st preset value, the value range corresponding to the distance index between the rock mass and the coal seam is [0.6,0.8 ]; and when the actual distance between the rock mass and the coal seam is not more than the 21 st preset value, the value range corresponding to the distance index between the rock mass and the coal seam is [0.8,1.0 ].
Optionally, the 20 th preset value is 10km, and the 21 st preset value is 3 km.
Optionally, the weight value corresponding to the distance between the rock mass and the coal seam is 0.2.
Alternatively, the actual rock mass to coal seam distance may be measured in the field.
Optionally, the structural parameter includes two indexes, namely a carbon layer spacing and a structural defect parameter, and a weight value corresponding to the structural parameter is 0.4.
Optionally, the distance between the carbon layers is provided with a 10 th preset value, an 11 th preset value and a 12 th preset value, and when the distance between the carbon layers of the sample is greater than the 12 th preset value, the value range corresponding to the distance index between the carbon layers is (0, 0.6); when the spacing between the carbon layers of the sample is greater than the 11 th preset value and not greater than the 12 th preset value, the value range corresponding to the spacing index of the carbon layers is [0.6,0.8 ]; and when the spacing between the carbon layers of the sample is not less than the 10 th preset value and not more than the 11 th preset value, the value range corresponding to the spacing index of the carbon layers is [0.8,1.0 ]. The spacing between carbon layers is 0.3441nm, which corresponds to 0.
Optionally, the structural defect parameter is provided with a 13 th preset value, a 14 th preset value and a 15 th preset value, and when the structural defect parameter of the sample is not less than the 14 th preset value and not more than the 15 th preset value, a value range corresponding to the structural defect parameter index is (0, 0.6); when the structural defect parameter of the sample is greater than the 13 th preset value and not greater than the 14 th preset value, the value range corresponding to the structural defect parameter index is [0.6,0.8 ]; and when the structural defect parameter of the sample is not more than the 13 th preset value, the value range corresponding to the structural defect parameter index is [0.8,1.0 ].
Optionally, the component parameters include three indexes, namely vitrinite reflectivity (Romax), volatile yield (Vdaf) and hydrogen-carbon element ratio (H/C), and the weight values corresponding to the component parameters are 0.6.
Optionally, the vitrinite reflectivity is provided with a first preset value, a second preset value and a third preset value, and when the vitrinite reflectivity of the sample is not less than the first preset value and less than the second preset value, the value range corresponding to the vitrinite reflectivity index is (0, 0.6); when the reflectivity of the sample vitrinite is not less than the second preset value and less than the third preset value, the value range corresponding to the reflectivity index of the vitrinite is [0.6,0.8 ]; and when the reflectivity of the sample vitrinite is not less than the third preset value, the value range corresponding to the reflectivity index of the vitrinite is [0.8,1.0 ].
Optionally, the volatile component yield is provided with a fourth preset value, a fifth preset value and a sixth preset value, and when the volatile component yield of the sample is greater than the fifth preset value and is not greater than the sixth preset value, the value range corresponding to the volatile component yield index is (0, 0.6); when the volatile component yield of the sample is not less than the fourth preset value and not more than the fifth preset value, the value range corresponding to the volatile component yield index is [0.6,0.8 ]; and when the volatile component yield of the sample is less than a fourth preset value, the value range corresponding to the volatile component yield index is [0.8,1.0 ].
Optionally, the hydrogen-carbon element ratio is provided with a seventh preset value, an eighth preset value and a ninth preset value, and when the hydrogen-carbon element ratio of the sample is not less than the eighth preset value and not more than the ninth preset value, the value range corresponding to the hydrogen-carbon element ratio index is (0, 0.6); when the hydrogen-carbon element ratio of the sample is not less than the seventh preset value and less than the eighth preset value, the value range corresponding to the hydrogen-carbon element ratio index is [0.6,0.8 ]; and when the hydrogen-carbon element ratio of the sample is smaller than a seventh preset value, the value range corresponding to the hydrogen-carbon element ratio index is [0.8,1.0 ].
Figure 333983DEST_PATH_IMAGE004
Optionally, the specific method for comparing the actual data of the sample with the corresponding index preset values respectively and taking the corresponding numerical values according to the comparison result includes: after the actual values of the seven indexes are compared with the preset values, when the values are taken, the preset values are used as abscissa and the boundary values of the value taking range are used as ordinate in the determined value taking range; when the value is (0,0.6), and the data is less than two groups, complementing by 0, drawing a fitting straight line, taking the actual value as a horizontal coordinate to be substituted into an equation of the obtained fitting straight line, and calculating to obtain a corresponding value; and when the value is [0.8,1.0), the value obtained by calculation is more than 1, and the value is 1.
For example, for the index of sampling point density, the actual sampling point density is 5 points/km2Not less than 16 th preset value of 3 points/km2And is less than 17 th preset value of 6 points/km2The value range is [0.6,0.8 ], 3 and 6 are used as abscissa, 0.6 and 0.8 are used as ordinate, that is, two points (3,0.6) and (6,0.8) are used to draw a fitting straight line, so as to obtain a straight line equation y =0.067x +0.4, then 5 is used as abscissa and is substituted into the equation, the corresponding value is calculated to be 0.733, and the value 0.733 is multiplied by the weighted value 1 corresponding to the density of the sampling point, so as to obtain 0.733, which is the evaluation value of the working degree.
For another example, for geological conditions, according to DZ/T0326-2018 & lt geological survey standards for mineral products of graphite and muscovite, the structural complexity of the sample is judged to be medium, the value is 0.8, and the value is multiplied by the weight value of structural deformation strength to be 0.3, so that 0.24 is obtained, namely the evaluation value of the structural deformation strength index;
the construction stress of a sample is 40 MPa, the value range is [0.8,1.0 ], a fitting straight line is drawn by two points of (0,0) and (30,0.8) to obtain a straight line equation y =2x/75, then 40 is taken as a horizontal coordinate to be substituted into the equation, the corresponding value is calculated to be 1.067 and is greater than the boundary value 1 of the value range, so the value is 1, and the value is multiplied by the weight value of the construction stress to be 0.2 to obtain 0.2, namely the evaluation value of the construction stress index;
the actual distance between the rock mass and the coal seam is 7km, the value range is [0.6,0.8 ], a fitting straight line is drawn by two points of (3,0.6) and (10,0.8) to obtain a straight line equation y =1x/35+0.514, then 7 is taken as a horizontal coordinate and is introduced into the equation, the corresponding value is calculated to be 0.714, and the value is multiplied by the weighted value of the distance between the rock mass and the coal seam to obtain 0.143, namely the evaluation value of the distance index between the rock mass and the coal seam;
the sample rock mass is judged to be the invasion of acid and medium acid rock bases and rock strains, the heat action time is longer, the value of the rock mass scale corresponding to the heat action strength index is 0.8, and the value is multiplied by the weighted value of the rock mass scale corresponding to the heat action strength index to be 0.3, so that 0.24 is obtained; the evaluation value of geological conditions was 0.24+0.2+0.143+0.24= 0.823.
For mineral conditions, the spacing between sample carbon layers is 0.34405nm, the value range is (0,0.6), two points of (0.344,0.6) and (0.3441,0) are used for drawing a fitting straight line, and a straight line equation y = -6 × 10 is obtained3x +2064.6, then, taking 0.34405 as a horizontal coordinate into the equation, and calculating to obtain a corresponding value of 0.3;
the structural defect parameter of the sample is 0.67, the value range is (0,0.6), a fitting straight line is drawn by two points of (0.7,0) and (0.65,0.6), a straight line equation y = -12x +8.4 is obtained, then 0.67 is taken as a horizontal coordinate and is substituted into the equation, and the corresponding value is calculated to be 0.36;
the sum of the value of the sample carbon layer spacing and the value of the structural defect parameter is 0.3+0.36=0.66, and then the sum is multiplied by the weight value of the structural parameter of 0.4 to obtain the evaluation value of the structural parameter of 0.264. At this time, the sample is identified as grade III, corresponding to graphitized anthracite.
The reflectivity of the sample vitrinite is 6.0%, the value range is (0,0.6), two points of (5.5,0) and (6.5,0.6) are used for drawing a fitting straight line to obtain a straight line equation y =0.6x-3.3, then 6.0 is taken as a horizontal coordinate to be substituted into the equation, and the corresponding value is calculated to be 0.3;
the yield of the volatile component of the sample is 5.6%, the value range is (0,0.6), a fitting straight line is drawn by two points of (6.5,0) and (4.5,0.6), a straight line equation y = -0.3x +1.95 is obtained, then 5.6 is taken as a horizontal coordinate and is substituted into the equation, and the corresponding value is calculated to be 0.27;
the hydrogen-carbon element ratio of the sample is 0.17, the value range is (0,0.6), a fitting straight line is drawn by two points of (0.2,0) and (0.15,0.6), a straight line equation y = -12x +2.4 is obtained, then 0.17 is taken as a horizontal coordinate and is substituted into the equation, and the corresponding value is calculated to be 0.36;
the sum of the reflectivity of the sample vitrinite, the volatile yield and the hydrogen-carbon element ratio is 0.3+0.27+0.36=0.93, and then the sum is multiplied by the weight value of the component parameter to obtain the evaluation value of the component parameter as 0.558. The evaluation value of the mineral condition was 0.264+0.558= 0.822.
In addition, the detection values of the component parameters of the sample are all in the value range corresponding to the grade III, which shows that the identification of the coal-series graphite type has universality.
Optionally, the working degree is provided with two preset ranges, namely (0,0.6) and [0.6, 1.0); the evaluation value of the working degree falls in the range of (0,0.6), which indicates that the working degree is poor, the sampling points are few, the obtained data representativeness of other six indexes is insufficient, and the sampling points are increased; the evaluation value of the degree of operation falls within the range of [0.6,1.0), indicating that the degree of operation is acceptable.
Optionally, the geological condition has three preset ranges, namely (0,0.6), (0.6,0.8) and (0.8, 1.0); the evaluation value of the geological condition falls in the range of (0,0.6), which indicates that the geological condition of the coal-series graphite is poor and the mining difficulty is high; the evaluation value of the geological condition falls in the range of [0.6,0.8), which indicates that the geological condition of the coal-series graphite is moderate and the mining difficulty is moderate; the evaluation value of the geological conditions falls within the range of [0.8,1.0 ], which indicates that the geological conditions of the coal-series graphite are good and the mining difficulty is low.
Optionally, the mineral conditions are provided with three preset ranges, namely (0,1.56), [1.56,2.08), and [2.08, 2.6); the evaluation value of mineral conditions falls within the range of (0,1.56), indicating that the development resource is graphitized anthracite, and is rated as grade III; the evaluation value of mineral conditions falls within the range of [1.56,2.08), indicating that the development resource is semi-graphite and is rated as class II; the evaluation value of mineral conditions falls within the range of [2.08,2.6), indicating that the development resource is graphite and is rated as class I.
In the above example, the evaluation value of the degree of operation was 0.733, which falls within the range of [0.6,1.0 ], indicating that the degree of operation is acceptable; the evaluation value of the geological condition is 0.823, and the evaluation value falls in the range of [0.8,1.0 ], which indicates that the geological condition of the coal mine is better and the mining difficulty is lower; the evaluation value of mineral conditions was 0.822, falling within the range of (0,1.56), indicating that the development resource was graphitized anthracite, rated as grade III.
For another example, for mineral conditions, the spacing between sample carbon layers is 0.34nm, the value range is [0.6,0.8 ], a fitting straight line is drawn by two points of (0.344,0.6) and (0.337,0.8), a straight line equation y = -28.57x +10.43 is obtained, then 0.34 is taken as a horizontal coordinate into the equation, and the corresponding value 0.716 is calculated;
the structural defect parameter of the sample is 0.63, the value range is [0.6,0.8 ], a fitting straight line is drawn by two points of (0.65,0.6) and (0.6,0.8) to obtain a straight line equation y = -4x +3.2, then 0.63 is taken as a horizontal coordinate to be substituted into the equation, and the corresponding value is calculated to be 0.68;
the sum of the value of the spacing between the sample carbon layers and the value of the structural defect parameter is 0.716+0.68=1.396, and then the sum is multiplied by the weight value of the structural parameter to obtain the estimated value of the structural parameter of 0.558. At this time, the sample was identified as II1Grade, corresponding to half graphite.
The reflectivity of the sample vitrinite is 7.0%, the value range is [0.6,0.8 ], a fitting straight line is drawn by two points of (6.5,0.6) and (7.5,0.8), a straight line equation y =0.2x-0.7 is obtained, then 7.0 is taken as a horizontal coordinate to be substituted into the equation, and the corresponding value is calculated to be 0.7;
the yield of the volatile components of the sample is 4.1%, the value range is [0.6,0.8 ], a fitting straight line is drawn by two points of (4.5,0.6) and (3.8,0.8) to obtain a straight line equation y = -0.286x +1.887, then 4.1 is taken as a horizontal coordinate to be substituted into the equation, and the corresponding value is calculated to be 0.714;
the hydrogen-carbon element ratio of the sample is 0.13, the value range is [0.6,0.8 ], a fitting straight line is drawn by two points of (0.15,0.6) and (0.1,0.8) to obtain a straight line equation y = -4x +1.2, then 0.13 is taken as a horizontal coordinate to be substituted into the equation, and the corresponding value is calculated to be 0.68;
the sum of the reflectivity of the sample vitrinite, the volatile yield and the hydrogen-carbon element ratio is 0.7+0.714+0.68=2.094, and the sum is multiplied by the weight value of the component parameter to obtain the evaluation value of the component parameter, namely 1.256. The evaluation value of the mineral condition was 0.558+1.256= 1.814.
In addition, the detection values of the component parameters of the sample are all in the value range corresponding to the II level.
The evaluation value of the mineral conditions of the above example was 1.814, which falls within the range of [1.56,2.08), indicating that the development resource was semi-graphitic and rated as class II.
For another example, for mineral conditions, the spacing between sample carbon layers is 0.3362nm, the value range is [0.8,1.0 ], a fitting straight line is drawn by two points of (0.337,0.8) and (0.3354,1.0), a straight line equation y = -125x +42.925 is obtained, then 0.3362 is taken as a horizontal coordinate into the equation, and the corresponding value is calculated to be 0.9;
the structural defect parameter of the sample is 0.6, the value range is [0.8,1.0 ], and the value is directly 0.8;
the sum of the value of the sample carbon layer spacing and the value of the structural defect parameter is 0.9+0.8=1.7, and then the sum is multiplied by the weight value of the structural parameter of 0.4 to obtain the evaluation value of the structural parameter of 0.68. At this point, the sample was identified as grade I, corresponding to graphite.
The reflectivity of the sample vitrinite is 8.0%, the value range is [0.8,1.0 ], a fitting straight line is drawn by two points of (7.5,0.8) and (0,0) to obtain a straight line equation y =8x/75, then 8.0 is taken as a horizontal coordinate to be substituted into the equation, and the corresponding value is calculated to be 0.853;
the yield of the volatile component of the sample is 2.2%, the value range is [0.8,1.0 ], a fitting straight line is drawn by two points of (3.8,0.8) and (0,1) to obtain a straight line equation y = -x/19+1, then 2.2 is taken as a horizontal coordinate to be introduced into the equation, and the corresponding value is calculated to be 0.884;
the hydrogen-carbon element ratio of the sample is 0.08, the value range is [0.8,1.0 ], a fitting straight line is drawn by two points of (0.1,0.8) and (0,1) to obtain a straight line equation y = -2x +1, then 0.08 is taken as a horizontal coordinate and is substituted into the equation, and the corresponding value is calculated to be 0.84;
the sum of the reflectivity of the sample vitrinite, the volatile yield and the hydrogen-carbon element ratio is 0.853+0.884+0.84=2.577, and the sum is multiplied by the weight value of the composition parameter of 0.6, so that the evaluation value of the composition parameter is 1.546. The evaluation value of the mineral conditions was 0.68+1.546= 2.226.
In addition, the detection values of the component parameters of the sample are all in the value range corresponding to the I level.
The evaluation value of the mineral conditions of the above example was 2.226, falling within the range of [2.08,2.6), indicating that the development resource was graphite and was rated as class I.
The identification of the coal-series graphite type and the evaluation of the coal-series graphite resource can mutually verify the grading and the classification of the coal-series graphite, and is convenient for technical personnel to check the reliability of data.

Claims (6)

1. A coal-series graphite mineral resource grading evaluation method is characterized by comprising the steps of identifying the type of coal-series graphite and evaluating the coal-series graphite resource;
the identification of the coal-based graphite type comprises the following steps: collecting a coal rock sample from a coal mine area, and detecting the coal rock sample; grading and identifying the coal rock sample according to the detection result data and the predetermined evaluation standard of each category of coal-series graphite;
the evaluation of the coal-based graphite resource comprises the following steps: testing the coal rock sample; comparing the test result data with the evaluation standards of the predetermined working degree, geological conditions and mineral conditions, and evaluating the coal-series graphite;
the working degree comprises indexes of sampling point density, the geological conditions comprise four indexes of structural deformation strength, structural stress, rock mass scale and thermal action strength and rock mass and coal seam distance, and the mineral conditions comprise two indexes of structural parameters and component parameters;
the evaluation of the coal-series graphite resource is respectively provided with corresponding index preset values and weight values for the seven indexes; respectively comparing the actual data of the coal rock sample with corresponding index preset values, taking corresponding numerical values according to comparison results, and multiplying the taken numerical values by the weight values of the corresponding indexes to obtain evaluation values of the corresponding indexes;
adding the evaluation values of all indexes belonging to the same condition to obtain the evaluation value of the condition;
the three conditions of the condition level are respectively provided with corresponding preset ranges, the evaluation values of different conditions fall into the corresponding preset ranges respectively, the coal mine area is graded, and corresponding development strategies are adopted according to the grading;
the concrete method for comparing the actual data of the coal rock sample with the corresponding index preset values respectively and taking the corresponding numerical values according to the comparison result comprises the following steps: after the actual values of the seven indexes are compared with the preset values, when the values are taken, the preset values are used as horizontal coordinates and the boundary values of the value ranges are used as vertical coordinates in the determined value ranges, when the data are less than two groups, the data are complemented by 0, a fitting straight line is drawn, then the actual values are used as the horizontal coordinates and are substituted into the equation of the obtained fitting straight line, and the corresponding values are obtained through calculation; when the value is [0.8,1.0), the value obtained by calculation is more than 1, and the value is 1;
the working degree is provided with two preset ranges, namely (0,0.6) and [0.6, 1.0); the evaluation value of the working degree falls in the range of (0,0.6), which indicates that the working degree is poor, the sampling points are few, the obtained data representativeness of other six indexes is insufficient, and the sampling points are increased; the evaluation value of the working degree falls in the range of [0.6,1.0), and the working degree is qualified;
the geological condition is provided with three preset ranges, namely (0,0.6), [0.6,0.8) and [0.8, 1.0); the evaluation value of the geological condition falls in the range of (0,0.6), which indicates that the geological condition of the coal-series graphite is poor and the mining difficulty is high; the evaluation value of the geological condition falls in the range of [0.6,0.8), which indicates that the geological condition of the coal-series graphite is moderate and the mining difficulty is moderate; the evaluation value of the geological condition falls in the range of [0.8,1.0 ], which indicates that the geological condition of the coal-series graphite is better and the mining difficulty is lower;
the mineral conditions are provided with three preset ranges, namely (0,1.56), [1.56,2.08) and [2.08, 2.6); the evaluation value of mineral conditions falls within the range of (0,1.56), indicating that the development resource is graphitized anthracite, and is rated as grade III; the evaluation value of mineral conditions falls within the range of [1.56,2.08), indicating that the development resource is semi-graphite and is rated as class II; the evaluation value of mineral conditions falls within the range of [2.08,2.6), indicating that the development resource is graphite and is rated as class I.
2. The method of claim 1, wherein the individual classes of coal-based graphite comprise graphite, semi-graphite, and graphitized anthracite.
3. The method according to claim 2, wherein the classification and identification of the coal petrography sample based on the test result data and predetermined evaluation criteria for each category of coal-based graphite comprises:
determining the evaluation standard of the composition parameters according to the predetermined classification of vitrinite reflectivity, the classification of volatile component yield and the classification of hydrogen-carbon element ratio;
and determining the evaluation standard of the structural parameters according to the predetermined grading of the carbon layer spacing and the grading of the structural defect parameters.
4. The rating method of claim 3, wherein the evaluation of coal-based graphite by comparing the test result data with predetermined evaluation criteria for working degree, geological conditions and mineral conditions comprises:
determining an evaluation standard of the working degree according to the predetermined classification of the density of the sampling points;
determining an evaluation standard of geological conditions according to a predetermined standard of structural deformation strength, a predetermined standard of structural stress, a predetermined standard of rock mass scale and thermal action strength and a predetermined standard of rock mass and coal seam distance;
and determining the evaluation standard of mineral conditions according to the evaluation standard of the composition parameters and the evaluation standard of the structure parameters.
5. The graded assessment method according to claim 3, wherein the vitrinite reflectance is graded as: less than 5.5%, 5.5-6.5%, 6.5-7.5% and more than 7.5%;
the volatile yield was graded as: less than 3.8%, 3.8-4.5%, 4.5-6.5% and more than 6.5%;
the grading of the hydrogen-carbon element ratio is as follows: less than 0.1, 0.1-0.15, 0.15-0.2 and more than 0.2;
the carbon layer spacing is graded as: 0.3354-0.3370, 0.3370-0.3440 and > 0.3440;
the structural defect parameters are graded as follows: less than or equal to 0.60, 0.60-0.65, 0.65-0.70 and more than 0.70.
6. The rating method according to claim 4, wherein the criterion of the structural deformation strength is: the structural complexity is divided into three stages: simple, medium, complex; simple criteria are: the ore body/ore layer is monoclinic or wide and oblique, and has no fracture structure and vein rock; the medium criteria are: the ore body/ore layer has secondary first-order flexure or local compact flexure, and has fracture and vein rock cutting; the complex criteria are: fault, ruffle or gangue rock development, the ore body/layer is severely damaged;
the construction stress criteria are: less than 20MPa, 20-30MPa and more than 30 MPa;
the standards of the scale and the thermal action strength of the rock mass are as follows: the method is divided into three stages according to rock mass properties: (1) invasion of dikes, cliffs and bedrock; (2) invasion of acidic and medium-acidic rock bases and rock strains; (3) invasion of acidic granite or neutral acidic amphibole;
the standard of the distance between the rock mass and the coal seam is as follows: more than 10km, 3-10km, 1-3 km.
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