CN115305348A - Method for improving structural distribution uniformity of sintered ore bed of super-thick material bed - Google Patents
Method for improving structural distribution uniformity of sintered ore bed of super-thick material bed Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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Abstract
A method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps: firstly, mixing a magnesium-containing flux with oily solid waste with a calorific value not lower than 2.5 MJ/kg; loading the crushed fuel into a fuel bin; respectively loading the uniformly mixed mineral aggregate into uniformly mixed mineral silos; the material layer from bottom to top on the material conveying belt is as follows: uniformly mixing an ore bed, a magnesium-containing flux, a mixed bed of oily solid waste with a calorific value not lower than 2.5MJ/kg, a quicklime bed, a fuel bed, a limestone bed and a return ore bed; conventional granulation and conventional sintering are carried out; and carrying out layered detection on the uniformity of the sinter bed structure. The invention ensures that the thickness of the sintering material layer is kept at 850-1000 mm, and the distribution uniformity of CaO and FeO in the sintering ore layer structure is reduced from the existing range of not less than 1.45% to not more than 1.1%, thereby greatly improving the distribution uniformity of the sintering ore layer structure.
Description
Technical Field
The invention relates to the technical field of sintered pellets in ferrous metallurgy, in particular to a method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material layer; it is especially suitable for the material layer with thickness of 850-1000 mm.
Background
In recent years, with increasingly strict national requirements on environmental protection, low-carbon smelting becomes a development trend of the steel industry.
In the iron ore sintering process, because the thick material layer has the functions of heat storage and heat preservation, the thermal efficiency can be effectively improved, the consumption of solid fuel is reduced, and further the carbon emission in the sintering process is reduced, therefore, the thick material layer sintering technology is widely used. It has been proposed to increase the height of the bed gradually to 900 mm. Generally, the thicker the bed, the greater its heat storage capacity. Through retrieval, a document 'research progress of an energy consumption mathematical model in an iron and steel sintering process' published in 2018 journal indicates that in order to reasonably utilize the heat storage amount of material layers, the temperature of the lower material layer is not too high, so that the fuel distribution needs to be segregated when the material layers are distributed, and the lower fuel distribution is less than that of the upper layer. The qualitative improvement of a brown sugar stone material in a brown sugar test, which is published in the document of iron 12392in 2017, namely 1239512362123699 (124271251012464124931247912412412412412479124521248812412424124279. Document Jingtang 550m published in the sintered pellet in 2013 2 The research on the materials and the sintered ore in different areas on a sintering pallet and the analysis on the chemical components and the microstructure of the willow steel sintered ore published in the sintered pellet in 2020 sample the material layers layer by layer and analyze the granularity and the components of the samples of different material layers, and the results show that the granularity of the lower part of the material layer is coarse, the fuel is less and the flux is less, in addition, the alkalinity of some samples of the lower part of the material layer is lower than 1.7, which deviates from the reasonable alkalinity range generated by the liquid phase. The essence of iron ore sintering is that part of materials in the mixture are melted to generate liquid phase and are bonded with other unmelted minerals, and the fusing agent is used for reducing the melting point of iron ore and leading the iron ore and the fusing agent to generate liquid phase at high temperature, so the segregation distribution of the fusing agentThe liquid phase of the sinter bed is not uniform, the generation condition of calcium ferrite is deteriorated, and the quality of the sinter is reduced. Meanwhile, the segregation of the fuel and the combustion zone gradually widen from top to bottom, and the air permeability changes (namely the change of oxygen supply) in the sintering process, so that the FeO generation environment changes layer by layer. The non-uniformity degree published in the literature of 'chemical composition and microstructure analysis of the willow steel sinter' is as follows: the thickness of a 750mm material layer is divided into five layers for sampling, the range of CaO content is 1.22-1.67wt%, and the range of FeO content is 2.58-3.81wt%, and the problem is only analyzed, and no problem solving measure is provided; document "Jingtang 550m 2 The research on the materials and the sintered ores on the sintering machine trolley in the partitioned manner' provides a measure for reducing the use of the iron ore powder with large granularity and a measure for adjusting the distribution parameters aiming at the problems, wherein the reduction of the use of the iron ore powder with large granularity can play a role in reducing the segregation of a flux, but limits the use conditions of iron ore powder resources, and the measure for adjusting the distribution parameters cannot solve the essential contradiction that the segregation is needed by fuels and the segregation is not needed by the flux. The document 'thick material layer sintering height direction homogeneity research' published in 2013 on sintered pellets shows that the FeO content of a finished product ore is distributed at the highest level at the lower layer, the middle layer is at the lowest level, the upper layer is at the middle value, a 850mm material layer is sampled in three layers (the sampling in three layers is poor in representativeness), the range of CaO content is 1.45-2.10wt%, the range of FeO content is 1.39-2.91wt%, aiming at the problem of uneven material layer distribution, the uniformity degree of ferrous iron content of sintered ores of different ore layers is improved by increasing the grain size content of more than 3mm in a fusing agent, a good effect is achieved, the range of FeO content is reduced to 0.69wt% after improvement, but the grain size coarse fusing agent of the fusing agent is not in contact with iron ore powder, so that the generation of a liquid phase is influenced, and the sintered ores are easy to grow and waste caused; also, the 'Shanxi Han steel super thick material layer homogeneous sintering technical industrial practice' published in Shanxi metallurgy in 2020 shows that the FeO content distribution of sintering finished ore with 900mm material layer increases from top to bottom layer by layer, the range of the FeO content between the upper layer and the lower layer is as high as 5.76wt%, and the range of the CaO content between the upper layer and the lower layer is as high as 2.41%, and three types of measures are adopted aiming at the problems: 1. proportioning structure of flux for improving yieldThe dosage of lime, reinforced granulation; 2. optimizing process parameters; 3. raw material management: optimizing the granularity of iron ore powder and fuel, reducing the use of coarse-fraction iron ore powder, and controlling the granularity of the fuel to be less than 3mm, and controlling the content of the coarse-fraction iron ore powder to be 75-78wt%. The measures 1 and 2 are conventional strengthening operation measures in the sintering process, and the operable space is small. The control of the size fraction of the raw material is an effective measure for controlling segregation, and the measure limits the selection range of the iron ore powder. The different distribution laws of FeO content in the above different documents are caused by different fuel conditions, combustion zone thickness and air permeability conditions.
Aiming at the problems, the method for improving the structural distribution uniformity of the sintered ore bed of the super-thick material bed is provided. In the existing conventional process, in order to meet the segregation degree of the sintering fuel of 900 material layers in the literature of Bao steel sintering solid fuel granularity control exploration and practice (journal issue: sintering pellets, 2010), sintering plants and the like of Bao steel control the fuel granularity to be at a level that the-3 mm granularity content accounts for 80 percent through research, and the heating efficiency of the fuel is influenced because the content of the-3 mm granularity content is increased due to the increase of the-0.5 mm granularity part in the fuel and the fuel is too fine. In the method provided by the patent, the fuel with the size fraction of-0.5 mm can be preferentially adhered, and the utilization efficiency of the fuel with the size fraction of-0.5 mm is improved, so that the fuel size fraction can be controlled to be finer (-3 mm is not less than 85%), the difference of the temperature of a material layer is more favorably reduced, and the difference of FeO content is further reduced.
Disclosure of Invention
Aiming at the problem of uneven material layer distribution when the thickness is 850-1000 mm in the prior art, the invention provides the method for improving the even distribution degree of the sintered ore layer structure of the super-thick material layer, which ensures that the thickness of the sintered ore layer is below 850-1000 mm and reduces the even distribution degree of CaO and FeO in the sintered ore layer structure from the existing range difference of not less than 1.45% to not more than 1.1%.
The measures for realizing the aim are as follows:
a method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps:
1) Fully mixing magnesium-containing flux and oily solid waste with a calorific value not lower than 2.5MJ/kg under online, wherein the mixing ratio is as follows: the magnesium-containing flux is not less than 90wt%, and the oily solid waste is not more than 10wt%; fully mixing and then loading into a magnesium-containing flux bin;
2) Loading the crushed fuel into a fuel bin, and controlling the part of the fuel with the granularity of less than or equal to 3mm to be not less than 85wt% and the part of the fuel with the granularity of more than 3mm to be not more than 15wt%;
3) Respectively loading the mixed mineral aggregate into a mixed mineral bin, loading the returned mineral aggregate into a returned mineral bin, loading quicklime into a quicklime bin, and loading limestone into other flux bins;
4) The material that will each participate in the batching is carried to defeated material belt according to conventional ratio on, and the bed of material of the output of material from bottom to top on defeated material belt is in proper order: uniformly mixing an ore bed, a magnesium-containing flux, a mixed bed of oily solid waste with a calorific value not lower than 2.5MJ/kg, a quicklime bed, a fuel bed, a limestone bed and a return ore bed;
the material layer on the material conveying belt from bottom to top follows the following principle:
one of the mixed ore layer and the return ore layer is arranged at the lowest layer, and the other is arranged at the uppermost layer;
the limestone layer is a second material layer or a penultimate layer from bottom to top on the conveying belt;
fixing the sequence of a mixed material layer of a magnesium-containing flux and oily solid waste with the calorific value not less than 2.5MJ/kg, a quicklime layer and a fuel layer as fixed; is arranged above or below the limestone layer;
5) Conveying the materials participating in the burdening to a uniformly mixing and granulating cylinder by a conveying belt in the step 4), and fully mixing and granulating;
6) Conventional sintering is carried out after conventional granulation;
7) Carrying out layered detection on the uniformity of the sinter bed structure:
A. equally dividing the sintered material into not less than 4 material taking layer sections in the height direction of the sintered material;
B. at least 3 evenly distributed sampling points are arranged in each material taking layer section, and the material taking amount of each sampling point is not less than 1000g;
C. after the material taking amount of each material taking layer section is uniformly mixed, detecting and recording CaO and FeO in the taken materials;
D. the maximum value CaO in the CaO data detected by the sections which are not less than 4 material taking layers is divided Maximum of With a minimum value of CaO Minimum size Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Maximum- CaO Minimum size ＝CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With a minimum value FeO Minimum size Subtracting to obtain a difference FeO Extreme difference I.e. by
FeO Maximum- FeO Minimum size ＝FeO Extreme difference ；
When CaO is contained Extreme difference And FeO Extreme difference When the average value is less than or equal to 1.1, the uniformity of the sinter bed structure is good.
It is characterized in that: the oily solid waste with the calorific value not lower than 2.5MJ/kg is as follows: sludge and sludge produced by cold rolling, silicon steel, hot rolling and steel making.
Further: the water content of the oily solid waste with the calorific value not lower than 2.5MJ/kg is controlled to be not lower than 5%.
It is characterized in that: the ore blending raw materials and the weight percentage content are as follows: and (3) mixing mineral aggregate uniformly: 50-70%, return mineral aggregate: 20-35%, a mixture of magnesium-containing flux and oily solid waste with a calorific value not lower than 2.5 MJ/kg: 2-6%, quicklime: 1 to 7%, fuel: 2-5%, limestone: not exceeding 7%.
It is characterized in that: according to the layout of the mixed material layer and the return ore layer, when other raw materials need to be added, the other raw materials are inserted into the sequence interval of the mixed material layer and the return ore layer except the sequence layer of the mixed material layer, the quicklime layer and the fuel layer which are fixed with magnesium-containing flux and oily solid waste with the calorific value not lower than 2.5 MJ/kg.
The action and mechanism of each main process in the invention
The invention adopts the mixture of magnesium-containing flux and oily solid waste with the calorific value not less than 2.5MJ/kg, and the mixing proportion is controlled as follows: the magnesium-containing flux is not less than 90wt%, and the oily solid waste is not more than 10wt%, because the oily solid waste contains impurities, the oily solid waste is not suitable to be added too much in the sintering process, and the addition of the oily solid waste in a certain proportion can cause bad influence on the sintering process, so the proportion is controlled to be lower.
The invention controls the fuel with the granularity less than or equal to 3mm not to be lower than 85wt%, and the fuel with the granularity more than 3mm not to be higher than 15wt%, because the sintering heat storage effect of the super-thick material layer is larger, the granularity of the fuel is controlled to ensure that the fuel is more distributed towards the upper layer and less distributed at the lower layer, the thickness of the combustion zone at the lower layer is reduced, and the uniform distribution of heat in each material layer is more facilitated.
The invention controls the material layer sequence of the mixture of the magnesium-containing flux and the oily solid waste material with the calorific value not less than 2.5MJ/kg, the quicklime and the fuel, namely, a quicklime layer is formed on the mixture layer of the magnesium-containing flux and the oily solid waste material with the calorific value not less than 2.5MJ/kg, a fuel layer is formed on the quicklime layer, the mixture of the magnesium-containing flux and the oily solid waste material with the calorific value not less than 2.5MJ/kg is mixed, and the quicklime layer on the upper layer is formed so as to ensure that the surface of the magnesium-containing flux has viscosity and has better granulation effect, so that the flux particles can be enlarged after granulation and are further distributed on the lower layer of a sinter layer, and the phenomenon that the flux particles are less distributed in the material layer on the lower part is weakened; the mixing of the magnesium-containing flux and the oily solid waste material with the calorific value not lower than 2.5MJ/kg and the making of the upper layer of the limestone as a fuel layer are used for making more fine-fraction fuel adhered to the surface of the magnesium-containing flux, so that the fine-fraction fuel is distributed relatively to a lower material layer, and simultaneously more heat sources around the flux generate higher temperature, thereby being beneficial to forming a liquid phase in the place containing the magnesium-containing flux and improving the content of ferrous oxide with stable quality of the sintering ore.
The invention equally divides the sintered material into no less than 4 material taking layer sections in the height direction, because the sampling points are too few, the distribution rule has poor presentation.
The invention at least sets 3 evenly distributed sampling points in each taking layer section, the material taking quantity of each sampling point is not less than 1000g, because each taking layer section carries out multi-point sampling, the representativeness of sampling can be ensured.
The present invention detects not less than 4 material taking layer sectionsCaO data of (2) Maximum of With a minimum value of CaO Minimum size of Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Maximum- CaO Minimum size of ＝CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With a minimum value FeO Minimum size of Subtracting to obtain a difference value FeO Extreme difference I.e. FeO Maximum of —FeO Minimum size of ＝FeO Extreme difference (ii) a When CaO is contained Extreme difference And FeO Extreme difference When the average value is less than or equal to 1.1, the uniformity of the sinter bed structure is good, because the range can represent the non-uniformity degree, the larger the range is, the larger the non-uniformity degree is, and the smaller the range is, the better the uniformity degree is.
Compared with the prior art, the invention ensures that the thickness of the sintering material layer is 850-1000 mm, and the distribution uniformity of CaO and FeO in the sintering ore layer structure is reduced from the existing range of not less than 1.45% to not more than 1.1%, thereby greatly improving the distribution uniformity of the sintering ore layer structure.
Detailed Description
The present invention is described in detail below:
comparative example 1 (sintering site parameters according to 900mm layer thickness, without the method according to the invention)
The ore blending raw materials and the weight percentage content of the comparative example are as follows: and (3) mixing mineral aggregate uniformly: 61.40%, return mineral aggregate: 24.4%, magnesium-containing flux: 4.6%, quicklime: 4.8%, fuel: 3.1%, limestone: 1.7 percent.
A method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps:
1) Firstly, loading a magnesium-containing flux into a magnesium-containing flux bin on line;
2) Loading the crushed fuel into a fuel bunker, and controlling the fuel with the granularity less than or equal to 3mm to be 71.3wt% and the fuel with the granularity more than 3mm to be 28.7wt%;
3) Respectively loading the mixed mineral aggregate into a mixed mineral bin, loading the returned mineral aggregate into a returned mineral bin, loading quicklime into a quicklime bin, and loading limestone into other flux bins;
4) The material that will each participate in the batching is carried to defeated material belt according to conventional ratio on, and the bed of material of the output of material from bottom to top on defeated material belt is in proper order: uniformly mixing an ore layer, a quicklime layer, a magnesium-containing flux layer, a fuel layer, a limestone layer and a return ore layer;
5) Conveying the materials participating in the batching to a blending and granulating cylinder by a conveying belt in the step 4), and fully blending and granulating;
6) Conventional sintering is carried out after conventional granulation;
7) Carrying out layered detection on the uniformity of the sinter bed structure:
A. equally dividing the sintered material into 5 material taking layer sections in the height direction of the sintered material;
B. 3 uniformly distributed sampling points are arranged on each material taking layer, and 1500g of material is taken from each sampling point;
C. after the material taking amount of each material taking layer section is uniformly mixed, detecting and recording CaO and FeO in the material taking;
D. the maximum value CaO in the CaO data detected by the divided 5 material taking layer sections Maximum of With a minimum value CaO Minimum size Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Maximum- CaO Minimum size ＝CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With the minimum value FeO Minimum size Subtracting to obtain a difference value FeO Extreme difference I.e. FeO Max- FeO Minimum size of ＝FeO Extreme difference 。
CaO and FeO test result list of this comparative example
In the comparative example, the fixed magnesium-containing flux and the mixture layer of the oily solid waste with the calorific value not lower than 2.5MJ/kg, the quicklime layer and the fuel layer are not mixed in sequence according to the invention; and because only magnesium-containing flux is added, oily solid waste with the calorific value not lower than 2.5MJ/kg is not added, and the fuel granularity is not controlled according to the fuel not less than 85wt% and less than or equal to 3mm, the extreme difference of CaO is as high as 2.29, and the extreme difference of FeO is as high as 1.64, which indicates the uniform distribution degree of the sintered ore bed structure.
Example 1
(sintering site parameters according to 900mm material layer thickness)
The ore blending raw materials and the weight percentage content of the embodiment are as follows: and (3) mixing mineral aggregate uniformly: 61.40%, return mineral aggregate: 24.4 percent of magnesium-containing flux and the mixture of oily solid waste with the calorific value not less than 2.5 MJ/kg: 4.6%, quicklime: 4.8%, fuel: 3.1%, limestone: 1.7 percent.
A method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps:
1) Firstly, fully mixing a magnesium-containing flux with oily solid waste with a calorific value not lower than 2.5MJ/kg under on-line conditions, wherein the mixing ratio is as follows: magnesium-containing flux: 91wt% and 9wt% of oily solid waste; fully mixing and then loading into a magnesium-containing flux bin;
2) Loading the crushed fuel into a fuel bunker, and controlling the fuel with the granularity less than or equal to 3mm to be 87.53wt% and the fuel with the granularity more than 3mm to be 12.47wt%;
3) Respectively loading the mixed mineral aggregate into a mixed mineral bin, loading the returned mineral aggregate into a returned mineral bin, loading quicklime into a quicklime bin, and loading limestone into other flux bins;
4) The material that will each participate in the batching is carried to defeated material belt according to conventional ratio on, and the bed of material of the output of material from bottom to top on defeated material belt is in proper order: uniformly mixing an ore bed, a magnesium-containing flux, a mixed bed of oily solid waste with a calorific value not lower than 2.5MJ/kg, a quicklime bed, a fuel bed, a limestone bed and a return ore bed;
5) Conveying the materials participating in the batching to a blending and granulating cylinder by a conveying belt in the step 4), and fully blending and granulating;
6) Conventional sintering is carried out after conventional granulation;
7) Carrying out layered detection on the uniformity of the sinter bed structure:
A. equally dividing the sintered material into 5 material taking layer sections in the height direction of the sintered material;
B. 4 uniformly distributed sampling points are arranged on each material taking layer, and each sampling point takes 1000g of material;
C. after the material taking amount of each material taking layer section is uniformly mixed, detecting and recording CaO and FeO in the material taking;
D. the maximum value CaO in the CaO data detected by the divided 5 material taking layer sections Maximum of With a minimum value CaO Minimum size Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Max- CaO Minimum size ＝CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With the minimum value FeO Minimum size of Subtracting to obtain a difference value FeO Extreme difference I.e. by
FeO Maximum- FeO Minimum size ＝FeO Extreme difference (ii) a The units are all in wt%;
when CaO is contained Extreme difference And FeO Extreme difference When the average content is less than or equal to 1.1wt%, the uniformity of the sinter bed structure is good.
CaO and FeO detection result list in this example
Compared with the comparative example, the five-layer difference and the extreme difference of the CaO and FeO contents are obviously less than or equal to 1.1wt%, which shows that the structure distribution of the sinter ore layer is very uniform.
Example 2
(sintering site parameters according to 920mm material layer thickness)
The ore blending raw materials and the weight percentage content of the embodiment are as follows: and (3) mixing mineral aggregate uniformly: 56.40%, return mineral aggregate: 28 percent of magnesium-containing flux and the mixture of oily solid waste with the calorific value not lower than 2.5 MJ/kg: 3.7%, quicklime: 2.8%, fuel: 3.2%, limestone: 5.9 percent.
A method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps:
1) Firstly, fully mixing a magnesium-containing flux with oily solid waste with a calorific value not lower than 2.5MJ/kg under on-line conditions, wherein the mixing ratio is as follows: magnesium-containing flux: 91.3wt% and 8.7wt% of oily solid waste; fully mixing and then loading into a magnesium-containing flux bin;
2) Loading the crushed fuel into a fuel bin, and controlling the fuel with the granularity less than or equal to 3mm to account for 88.10wt% and the fuel with the granularity more than 3mm to account for 11.90wt%;
3) Respectively loading the mixed ore materials into a mixed ore bin, loading the returned ore materials into a return ore bin, loading quicklime into a quicklime bin, and loading limestone into other flux bins;
4) The materials participating in the batching are conveyed to a conveying belt according to the conventional proportion, and the material layer of the output of the materials from bottom to top on the conveying belt is as follows: uniformly mixing an ore bed, a limestone bed, a mixed bed of magnesium-containing flux and oily solid waste with a calorific value not lower than 2.5MJ/kg, a quicklime bed, a fuel bed and a return ore bed;
5) Conveying the materials participating in the batching to a blending and granulating cylinder by a conveying belt in the step 4), and fully blending and granulating;
6) Conventional sintering is carried out after conventional granulation;
7) Carrying out layered detection on the uniformity of the sinter bed structure:
A. equally dividing the sintered material into 5 material taking layer sections in the height direction of the sintered material;
B. 3 evenly distributed sampling points are arranged in each material taking layer section, and 1050g of material is taken from each sampling point;
C. after the material taking amount of each material taking layer section is uniformly mixed, detecting and recording CaO and FeO in the material taking;
D. the maximum value CaO in the CaO data detected by the divided 5 material taking layer sections Maximum of With a minimum value of CaO Minimum size of Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Maximum- CaO Minimum size ＝CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With a minimum value FeO Minimum size Subtracting to obtain a difference FeO Extreme difference I.e. by
FeO Maximum- FeO Minimum size of ＝FeO Extreme difference (ii) a The units are all in wt%;
when CaO is contained Extreme difference And FeO Extreme difference When the average content is less than or equal to 1.1wt%, the uniformity of the sinter bed structure is good.
CaO and FeO detection result list in this example
Compared with the comparative example, the five-layer difference and the range of the CaO and FeO contents are obviously less than or equal to 1.1wt%, which shows that the structure distribution of the sinter ore layer is very uniform.
Example 3
(sintering site parameters according to 890mm material layer thickness)
The ore blending raw materials and the weight percentage content of the embodiment are as follows: and (3) mixing mineral aggregate uniformly: 60.9%, return mineral aggregate: 24.5 percent of magnesium-containing flux and the mixture of oily solid waste with the calorific value not less than 2.5 MJ/kg: 3.2%, quicklime: 4.0%, fuel: 3.4%, limestone: 4.0 percent.
A method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps:
1) Firstly, fully mixing a magnesium-containing flux with oily solid waste with a calorific value not lower than 2.5MJ/kg under on-line conditions, wherein the mixing ratio is as follows: magnesium-containing flux: 91.67wt% and 8.33wt% of oily solid waste; fully mixing and then loading into a magnesium-containing flux bin;
2) Loading the crushed fuel into a fuel bunker, and controlling the fuel with the granularity less than or equal to 3mm to be 86.28wt% and the fuel with the granularity more than 3mm to be 13.72wt%;
3) Respectively loading the mixed mineral aggregate into a mixed mineral bin, loading the returned mineral aggregate into a returned mineral bin, loading quicklime into a quicklime bin, and loading limestone into other flux bins;
4) The material that will each participate in the batching is carried to defeated material belt according to conventional ratio on, and the bed of material of the output of material from bottom to top on defeated material belt is in proper order: a returned ore bed, a limestone bed, a mixed bed of magnesium-containing flux and oily solid waste with a calorific value not lower than 2.5MJ/kg, a quicklime bed, a fuel bed and a uniformly mixed ore bed;
5) Conveying the materials participating in the batching to a blending and granulating cylinder by a conveying belt in the step 4), and fully blending and granulating;
6) Conventional sintering is carried out after conventional granulation;
7) Carrying out layered detection on the uniformity of the sinter bed structure:
A. equally dividing the sintered material into 5 material taking layer sections in the height direction of the sintered material;
B. 3 evenly distributed sampling points are arranged on each material taking layer, and 2000g of material is taken from each sampling point;
C. after the material taking amount of each material taking layer section is uniformly mixed, detecting and recording CaO and FeO in the material taking;
D. the maximum value CaO in the CaO data detected by the divided 5 material taking layer sections Maximum of With a minimum value CaO Minimum size Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Maximum- CaO Minimum size ＝CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With the minimum value FeO Minimum size of Subtracting to obtain a difference value FeO Extreme difference I.e. by
FeO Max- FeO Minimum size of ＝FeO Extreme difference (ii) a The units are all in wt%;
when CaO is contained Extreme difference And FeO Extreme difference When the average content is less than or equal to 1.1wt%, the uniformity of the sinter bed structure is good.
CaO and FeO test result list in this example
Compared with the comparative example, the five-layer difference and the extreme difference of the CaO and FeO contents are obviously less than or equal to 1.1wt%, which shows that the structure distribution of the sinter ore layer is very uniform.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (5)
1. A method for improving the structural distribution uniformity of a sintered ore bed of an ultra-thick material bed comprises the following steps:
1) Fully mixing magnesium-containing flux and oily solid waste with a calorific value not lower than 2.5MJ/kg under online, wherein the mixing ratio is as follows: the magnesium-containing flux is not less than 90wt%, and the oily solid waste is not more than 10wt%; fully mixing and then loading into a magnesium-containing flux bin;
2) Loading the crushed fuel into a fuel bin, and controlling the part with the granularity less than or equal to 3mm and the part with the granularity more than 3mm to be not less than 85wt% and not more than 15wt%;
3) Respectively loading the mixed ore materials into a mixed ore bin, loading the returned ore materials into a return ore bin, loading quicklime into a quicklime bin, and loading limestone into other flux bins;
4) The material that will each participate in the batching is carried to defeated material belt according to conventional ratio on, and the bed of material of the output of material from bottom to top on defeated material belt is in proper order: uniformly mixing an ore bed, a magnesium-containing flux, a mixed bed of oily solid waste with a calorific value not lower than 2.5MJ/kg, a quicklime bed, a fuel bed, a limestone bed and a return ore bed;
the material layer on the material conveying belt from bottom to top follows the following principle:
one of the mixed ore layer and the return ore layer is arranged at the lowest layer, and the other is arranged at the uppermost layer;
the limestone layer is the second layer or the last but one layer from bottom to top on the material conveying belt;
fixing the sequence of a mixed material layer of a magnesium-containing flux and oily solid waste with the calorific value not less than 2.5MJ/kg, a quicklime layer and a fuel layer as fixed; is arranged above or below the limestone layer;
5) Conveying the materials participating in the batching to a blending and granulating cylinder by a conveying belt in the step 4), and fully blending and granulating;
6) Conventional sintering is carried out after conventional granulation;
7) Carrying out layered detection on the uniformity of the sinter bed structure:
A. equally dividing the sintered material into not less than 4 material taking layer sections in the height direction of the sintered material;
B. at least 3 evenly distributed sampling points are arranged in each material taking layer section, and the material taking amount of each sampling point is not less than 1000g;
C. after the material taking amount of each material taking layer section is uniformly mixed, detecting and recording CaO and FeO in the material taking;
D. the maximum value CaO in the CaO data detected by the sections which are not less than 4 material taking layers is divided Maximum of With a minimum value of CaO Minimum size Subtracting to obtain a difference value CaO Extreme difference I.e. CaO Maximum- CaO Minimum size of =CaO Extreme difference (ii) a The maximum value FeO in the FeO data detected by not less than 4 material taking layer sections Maximum of With the minimum value FeO Minimum size Subtracting to obtain a difference FeO Extreme difference I.e. FeO Maximum- FeO Minimum size =FeO Extreme difference (ii) a The units are all in wt%;
when CaO is contained Extreme difference And FeO Extreme difference When the average content is less than or equal to 1.1wt%, the uniformity of the sinter bed structure is good.
2. The method of claim, wherein the step of uniformly distributing the sintered ore layer structure of the super-thick layer comprises: the oily solid waste with the calorific value not lower than 2.5MJ/kg is as follows: sludge and sludge produced by cold rolling, silicon steel, hot rolling and steel making.
3. A method for improving the uniformity of the structure distribution of a sintered ore layer with an ultra-thick layer according to claim 1 or 2, wherein: the water content of the oily solid waste with the calorific value not lower than 2.5MJ/kg is controlled to be not lower than 5%.
4. The method for improving the structural uniformity of the sintered ore layer with ultra-thick layer according to claim 1, wherein: the ore blending raw materials and the weight percentage content are as follows: and (3) mixing mineral aggregate uniformly: 50-70%, return mineral aggregate: 20-35%, a mixture of magnesium-containing flux and oily solid waste with a calorific value not lower than 2.5 MJ/kg: 2-6%, quicklime: 1 to 7%, fuel: 2-5%, limestone: not more than 7%.
5. The method for improving the structural uniformity of the sintered ore bed with the ultra-thick material layer according to claim 1, wherein: according to the layout of the mixed material layer and the return mineral material layer, when other raw materials need to be added, the other raw materials are inserted into the sequence interval of the mixed material layer and the return mineral material layer except the sequence layer of the mixed material layer, the quicklime layer and the fuel layer which fix magnesium-containing flux and oily solid waste with the calorific value not lower than 2.5 MJ/kg.
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