CN114620972A - Electric heating cement plate and preparation method thereof - Google Patents
Electric heating cement plate and preparation method thereof Download PDFInfo
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- CN114620972A CN114620972A CN202210170594.5A CN202210170594A CN114620972A CN 114620972 A CN114620972 A CN 114620972A CN 202210170594 A CN202210170594 A CN 202210170594A CN 114620972 A CN114620972 A CN 114620972A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides an electric cement board and a preparation method thereof, wherein the preparation method of the electric cement board comprises the following steps: placing the crushed graphite mining waste stone into an ore grinding machine for ore grinding treatment; and mixing the ground graphite mining waste stone, cement, water and spherical graphite tailings, adding the mixture into a mold, inserting electrodes into two sides of the mold, demolding after curing, continuing curing, and drying to obtain the electric heating cement plate. The preparation method of the invention selects the graphite mining waste stone and the spherical graphite tailing as main raw materials, and the prepared electric cement board has effective heating function, low energy consumption and environmental protection value, and can achieve lower volume resistivity, higher compression resistance and higher breaking strength on the basis of not adding steel fibers or carbon fibers by embedding stainless steel or copper mesh electrodes into the graphite mining waste stone and the spherical graphite tailing after ore grinding treatment as the raw materials by adopting a dipolar method.
Description
Technical Field
The invention relates to the technical field of electric heating plate preparation, in particular to an electric heating cement plate and a preparation method thereof.
Background
China is a big graphite exploitation country, and with the increase of the exploitation amount of graphite, the yield of waste graphite exploitation rocks is also increased rapidly. The traditional treatment method for graphite mining waste rocks is stacking in open-pit mine areas, and long-time stacking occupies a large amount of land, thereby causing environmental pollution and resource waste. The comprehensive utilization of resources is the subject of the current social development, and the graphite mining waste rocks are used for building cement-based materials instead of natural sand, so that the method is an effective way for solving the problems of natural aggregate resource shortage and resource utilization rate improvement.
The spherical graphite tailing is micro powder generated in the processing of spherical graphite, has the characteristics of small particle size, low tap density and the like, has the yield of more than 50 percent, and is mainly used as a carburant, a pencil lead or a graphite coating at present. Because the output is too large and the supply and demand are over, the spherical graphite tailing is overstocked seriously, which becomes a difficult problem which troubles spherical graphite manufacturers.
However, at present, no scheme for preparing the electric cement plate by taking graphite mining waste rocks and spherical graphite tailings as main raw materials exists.
Disclosure of Invention
In view of the above, the present invention provides an electric cement board and a method for manufacturing the same, so as to solve or partially solve the problems in the prior art.
In a first aspect, the invention provides a preparation method of an electric heating cement plate, which comprises the following steps:
pre-crushing the graphite mining waste rocks;
placing the crushed graphite mining waste stone into an ore mill for ore milling treatment;
mixing the graphite mining waste stone after the ore grinding treatment, cement, water and spherical graphite tailings, adding the mixture into a mold, inserting electrodes into two sides of the mold, demolding after curing, continuing curing, and drying to obtain the electric heating cement plate.
Preferably, the preparation method of the electric hot cement plate further comprises the following step of proportioning the graphite mining waste rocks after the ore grinding treatment according to the following grading table before mixing the graphite mining waste rocks after the ore grinding treatment:
preferably, the preparation method of the electric hot cement plate comprises the following specific steps of putting the crushed graphite mining waste rock into an ore mill for ore milling treatment: grinding at a rotation speed of 60-80r/min and a grinding mass fraction of 40-80% for 5-25 min.
Preferably, in the preparation method of the electric heating cement plate, the ratio of the mass of cement to the mass of water to the sum of the mass of the graphite mining waste rock and the mass of the spherical graphite tailings is (20-24) to (11-15) to (63-67), and the spherical graphite tailings are 7-14% of the mass of the graphite mining waste rock.
Preferably, the preparation method of the electric heating cement plate comprises the steps of mixing the graphite mining waste stone after ore grinding, cement, water and spherical graphite tailings, adding the water reducing agent, and then adding the mixture into a mold.
Preferably, the preparation method of the electric heating cement plate comprises the steps of curing at 19-21 ℃ for 1-3 days, and then demolding.
Preferably, the preparation method of the electric heating cement plate is used for continuously maintaining the electric heating cement plate in a standard maintenance room for 24-28 days.
Preferably, the drying temperature of the preparation method of the electric heating cement plate is 45-55 ℃.
An electric heating cement plate is prepared by the preparation method.
Compared with the prior art, the electric cement board and the preparation method thereof have the following beneficial effects:
1. according to the preparation method of the electric heating cement board, the graphite mining waste stone and the spherical graphite tailings are selected as main raw materials, and the prepared electric heating cement board has an effective heating function, is low in energy consumption, has an environmental protection value, and more meets the market demand. According to the preparation method of the electric heating cement board, solid waste and cheap conductive phase materials are adopted, compared with the traditional electric heating cement board raw materials, the excitation of the conductivity of the raw materials is carried out, the waste is utilized to the greatest extent, and the preparation method has technical value. Furthermore, the graphite mining waste rock is subjected to ore grinding treatment, aggregate particle shaping and residual graphite performance excitation are performed on the graphite mining waste rock, the overall strength of the electric heating plate is improved, and the volume resistivity of the electric heating plate is reduced. The graphite mining waste rock and the spherical graphite tailing after ore grinding treatment are used as raw materials, a dipolar method is adopted to embed a stainless steel or copper mesh electrode, and lower volume resistivity, higher compression resistance and higher breaking strength can be achieved on the basis of no addition of steel fibers or carbon fibers. By controlling the alternating voltage, the electric heating plates with different heating temperatures can be obtained, and the heating rate of the plates is high, the heating power is low, and the heating temperature is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of an electric heating cement plate in one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides a preparation method of an electric heating cement plate, which comprises the following steps:
s1, pre-crushing the graphite mining waste rocks;
s2, placing the crushed graphite mining waste stone into an ore mill for ore milling treatment;
and S3, mixing the graphite mining waste stone after the ore grinding treatment, cement, water and spherical graphite tailings, adding the mixture into a mold, inserting electrodes into two sides of the mold, demolding after curing, continuing curing, and drying to obtain the electric heating cement plate.
The preparation method of the electric cement board has the advantages that the graphite mining waste rock and the spherical graphite tailings are selected as main raw materials, and the prepared electric cement board has an effective heating function, is low in energy consumption and has an environmental protection value, and meets the market demand more and more. The electric heating cement board material prepared by the invention adopts solid waste and cheap conductive phase materials. Compare in traditional electric cement board raw materials, carried out the excitation of raw and other materials electric conductivity, furthest has carried out the utilization of discarded object, has technical value. Furthermore, by carrying out ore grinding treatment on the graphite mining waste stone, aggregate particle shaping and residual graphite performance excitation are carried out on the graphite mining waste stone, the overall strength of the electric heating plate is improved, and the volume resistivity of the electric heating plate is reduced. The graphite mining waste rock and the spherical graphite tailing after ore grinding treatment are used as raw materials, a dipolar method is adopted to embed a stainless steel or copper mesh electrode, and lower volume resistivity, higher compression resistance and higher breaking strength can be achieved on the basis of no addition of steel fibers or carbon fibers. By controlling the magnitude of the alternating current voltage, the electric heating plates with different heating temperatures can be obtained, the heating rate of the plates is high, the heating power is low, the heating temperature is high, the preparation process is simple, and the cost is low. The preparation method of the electric heating cement plate has the advantages of simple preparation process, easily available raw materials, low process production cost, high plate yield and good economic value. By controlling the process conditions such as material proportion, forming pressure, forming moisture and the like and changing the voltage, the electric heating plate with different density grades, strength grades and heating temperatures can be prepared, the requirements of different building fields on the mechanical property and the heating temperature of the plate are met, the application range is wide, and the electric heating plate has application value.
In some embodiments, before mixing the graphite mining waste rock after the ore grinding treatment, the method further comprises proportioning the graphite mining waste rock after the ore grinding treatment according to the following grading table:
specifically, the grading table of the graphite mining waste rock is prepared according to GB-T14684-2001. The content of each grade of the graphite mining waste rock is expressed by accumulated screen residue (percentage of oversize part to total mass after complete screening), wherein the accumulated screen residue of 10.00mm grade is 0%, the accumulated screen residue of 4.75mm grade is 0-10%, the accumulated screen residue of 2.36mm grade is 10-56%, the accumulated screen residue of 1.18mm grade is 56-76%, the accumulated screen residue of 0.60mm grade is 85-76%, the accumulated screen residue of 0.30mm is 90-85%, the accumulated screen residue of 0.15mm grade is 95-90%, and the accumulated screen residue of 0.075mm grade is 100-95%.
In some embodiments, the ore grinding treatment of the crushed graphite mining waste rock in an ore mill is specifically as follows: grinding at a rotation speed of 60-80r/min and a grinding mass fraction of 40-80% for 5-25 min. Preferably, grinding for 10min at the rotation speed of 70r/min and the grinding mass fraction of 60%.
And determining the optimal ore grinding conditions, so that the crushed graphite mining waste stone particles are fractured at the fracture, performing particle shaping, exposing residual graphite, reducing the yield of stone powder, and improving the mechanical strength and the conductivity. Specifically, the movement mode of the steel balls in the ore mill adopts a cascading type, grinding is mainly performed, impact is assisted, and an ore grinding test is performed under the condition that the ore grinding mass fraction is 60%, and the result shows that the ore grinding mass fraction is 60%, and the ore grinding time is 10min, so that the electric heating plate with low stone powder yield, high compressive and flexural strength and low volume resistivity can be obtained.
In some embodiments, the ratio of the mass of the cement to the mass of the water to the sum of the mass of the graphite mining waste rock and the mass of the spherical graphite tailings is (20-24) to (11-15) to (63-67), and the spherical graphite tailings is 7-14% of the mass of the graphite mining waste rock.
In some embodiments, the graphite mining waste rock after ore grinding, cement, water and spherical graphite tailings are mixed, and then added with a water reducing agent, and then added into a mold.
Specifically, the water reducing agent is a polycarboxylic acid water reducing agent, and the adding amount of the water reducing agent is properly added according to the fluidity of the mortar, for example, the adding amount of the water reducing agent is 1-5% of the mass of the cement.
In some embodiments, the mold is removed after curing at 19-21 ℃ for 1-3 days.
In some embodiments, curing is continued in a standard curing room for 24-28 d. Specifically, the concrete curing room is special curing equipment for the concrete testing room, and accords with the national GB/T50081-2002 standard of mechanical property test method for common concrete: the temperature of the concrete standard curing room is ensured to be 20 +/-2 ℃, and the relative humidity is more than 95% RH.
In some embodiments, the drying temperature is 45-55 ℃.
In some embodiments, the electrode may be a stainless steel electrode mesh, and the mold may be determined according to the use requirement, for example, the mold is provided with a rectangular cavity, so that the formed electrothermal cement board is also rectangular and includes two electrodes.
Based on the same invention concept, the embodiment of the application also provides an electric heating cement plate which is prepared by the preparation method, the structure of the electric heating cement plate is shown in figure 1, the electric heating cement plate comprises a cement plate 1 and electrodes 2, obviously, the cement plate 1 is matched with a mould, graphite mining waste stone after ore grinding, cement, water and spherical graphite tailings are mixed and added into the mould, then the electrodes are inserted into two sides of the mould, the mould is released after maintenance, the maintenance is continued, and the electric heating cement plate comprising the cement plate 1 and the electrodes 2 is obtained after drying. The electric heating cement board has higher compression strength and bending strength in mechanical property, and is not easy to damage when being used for wall surface pasting. In the aspect of electrical performance, the volume resistivity is low, the heating temperature can be higher under the safety voltage, the heating power is low, and the electric energy consumption is reduced. In the aspect of thermal property, the heating rate of the electric heating plate is higher, the temperature can reach higher temperature within 0.5-1h, and the final temperature can be basically reached within 1.5 h. When the electric heating plate is used, the electrodes are connected with a power supply, the electric heating plates with different heating temperatures can be obtained by controlling the size of alternating current voltage, the heating speed of the plates is high, the heating power is low, the heating temperature is high, the preparation process is simple, and the cost is low.
The following further describes the preparation method and preparation method of the electric heating cement plate of the present application with specific examples. The graphite mining waste rocks and the spherical graphite tailings used in the following examples are all from a certain mineral plant in Yunshan, North Rongjiang.
Example 1
The embodiment of the application provides a preparation method of an electric heating cement plate, which comprises the following steps:
s1, crushing the graphite mining waste rocks to a proper size fraction by a jaw crusher and a double-roller crusher;
s2, placing the graphite mining waste stone of the S1 into an ore grinding machine, and grinding for 15min at the rotating speed of 70r/min and the ore grinding mass fraction of 60%;
s3, mixing the graphite mining waste rocks after grinding according to the following grading table:
| size fraction/mm | 4.75 | 2.36 | 1.18 | 0.60 | 0.30 | 0.15 | 0.075 | 0.00 |
| Cumulative percent sifting/percent | 3.36 | 55.47 | 75.37 | 82.35 | 86.50 | 91.65 | 96.31 | 100.00 |
；
S4, mixing cement of 52.5 grade and water uniformly in a stirring pot, adding the graphite mining waste stone ground in the step S3, continuously stirring, pouring the uniformly stirred materials into a mould, inserting a stainless steel electrode net into two sides of the mould, compacting, curing at 20 ℃ for 2 days, demoulding, continuously placing into a standard curing chamber, curing for 26 days, and drying at 50 ℃ after curing is finished to obtain a cement board;
wherein the ratio of the mass of the cement of the 52.5 grade, the mass of water and the graphite mining waste rock is 22:11: 67;
wherein, the mould has a forming cavity of 4cm multiplied by 16cm (namely, the length and the width are both 4cm, and the height is 16 cm).
Example 2
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as the embodiment 1 except that the ore grinding mass fraction in the step S2 is 40%, and the rest processes are the same as the embodiment 1.
Example 3
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as the embodiment 1, except that the ore grinding mass fraction in the step S2 is 50%, and the rest processes are the same as the embodiment 1.
Example 4
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as that of embodiment 1, except that the ore grinding mass fraction in step S2 is 70%, and the rest processes are the same as those of embodiment 1.
Example 5
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as the embodiment 1, except that the ore grinding mass fraction in the step S2 is 80%, and the rest processes are the same as the embodiment 1.
Example 6
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as that of embodiment 1, except that the ore grinding time in step S2 is 5min, and the rest processes are the same as those of embodiment 1.
Example 7
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as that of embodiment 1, except that the ore grinding time in step S2 is 10min, and the rest processes are the same as those of embodiment 1.
Example 8
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as that of embodiment 1, except that the ore grinding time in step S2 is 20min, and the rest processes are the same as those of embodiment 1.
Example 9
The embodiment of the application provides a preparation method of an electric heating cement plate, which is the same as that of embodiment 1, except that the ore grinding time in step S2 is 25min, and the rest processes are the same as those of embodiment 1.
Example 10
The embodiment of the application provides a preparation method of an electric heating cement plate, which comprises the following steps:
s1, crushing the graphite mining waste rocks to a proper size fraction by a jaw crusher and a double-roller crusher;
s2, placing the graphite mining waste stone of the S1 into an ore grinding machine, and grinding for 15min at the rotating speed of 70r/min and the ore grinding mass fraction of 60%;
s3, mixing the graphite mining waste rocks after grinding according to the following grading table:
| size fraction/mm | 4.75 | 2.36 | 1.18 | 0.60 | 0.30 | 0.15 | 0.075 | 0.00 |
| Cumulative percent sifting/percent | 3.36 | 55.47 | 75.37 | 82.35 | 86.50 | 91.65 | 96.31 | 100.00 |
；
S4, uniformly mixing the spherical graphite tailing, cement of 52.5 grade, water and a polycarboxylic acid water reducing agent in a stirring pot, adding the graphite mining waste stone ground in the step S3, continuously stirring, pouring the uniformly stirred material into a mold, inserting a stainless steel electrode net into two sides of the mold, compacting, curing at 20 ℃ for 2 days, demolding, continuously putting into a standard curing chamber for curing for 26 days, and drying at 50 ℃ after curing is finished to obtain the electric hot cement plate;
wherein the ratio of the mass of the cement with the 52.5 grade to the mass of the water to the sum of the mass of the graphite mining waste stone and the mass of the spherical graphite tailing is 22:13:65, the spherical graphite tailing accounts for 9 percent of the mass of the graphite mining waste stone, and the mass of the polycarboxylic acid water reducing agent accounts for 1.44 percent of the mass of the cement with the 52.5 grade;
wherein, the mould has a forming cavity of 4cm multiplied by 16cm (namely, the length and the width are both 4cm, and the height is 16 cm).
Example 11
The embodiment of the application provides a preparation method of an electric heating cement plate, which comprises the following steps:
s1, crushing the graphite mining waste rocks to a proper size fraction by a jaw crusher and a double-roller crusher;
s2, placing the graphite mining waste stone of the S1 into an ore grinding machine, and grinding for 15min at the rotating speed of 70r/min and the ore grinding mass fraction of 60%;
s3, proportioning the graphite mining waste rocks after grinding according to the following grading table:
| size fraction/mm | 4.75 | 2.36 | 1.18 | 0.60 | 0.30 | 0.15 | 0.075 | 0.00 |
| Cumulative percent sifting/percent | 3.36 | 55.47 | 75.37 | 82.35 | 86.50 | 91.65 | 96.31 | 100.00 |
；
S4, uniformly mixing the spherical graphite tailing, cement of 52.5 grade, water and a polycarboxylic acid water reducing agent in a stirring pot, adding the graphite mining waste stone ground in the step S3, continuously stirring, pouring the uniformly stirred material into a mold, inserting a stainless steel electrode net into two sides of the mold, compacting, curing at 20 ℃ for 2 days, demolding, continuously putting into a standard curing chamber for curing for 26 days, and drying at 50 ℃ after curing is finished to obtain the electric hot cement plate;
wherein the ratio of the mass of the cement of grade 52.5 to the mass of the water to the sum of the mass of the graphite mining waste stone and the mass of the spherical graphite tailing is 22:13:65, the mass of the spherical graphite tailing is 10 percent of the mass of the graphite mining waste stone, and the mass of the polycarboxylic acid water reducing agent is 1.52 percent of the mass of the cement of grade 52.5;
wherein, the mould has a forming cavity of 4cm multiplied by 16cm (namely, the length and the width are both 4cm, and the height is 16 cm).
Example 12
The embodiment of the application provides a preparation method of an electric heating cement plate, which comprises the following steps:
s1, crushing the graphite mining waste rocks to a proper size fraction by a jaw crusher and a double-roller crusher;
s2, placing the graphite mining waste stone of the S1 into an ore grinding machine, and grinding for 15min at the rotating speed of 70r/min and the ore grinding mass fraction of 60%;
s3, mixing the graphite mining waste rocks after grinding according to the following grading table:
| size fraction/mm | 4.75 | 2.36 | 1.18 | 0.60 | 0.30 | 0.15 | 0.075 | 0.00 |
| Cumulative percent sifting/percent | 3.36 | 55.47 | 75.37 | 82.35 | 86.50 | 91.65 | 96.31 | 100.00 |
；
S4, uniformly mixing the spherical graphite tailing, cement of 52.5 grade, water and a polycarboxylic acid water reducing agent in a stirring pot, adding the graphite mining waste stone ground in the step S3, continuously stirring, pouring the uniformly stirred material into a mold, inserting a stainless steel electrode net into two sides of the mold, compacting, curing at 20 ℃ for 2 days, demolding, continuously putting into a standard curing chamber for curing for 26 days, and drying at 50 ℃ after curing is finished to obtain the electric hot cement plate;
wherein the ratio of the mass of the cement with the 52.5 grade to the mass of the water to the sum of the mass of the graphite mining waste stone and the mass of the spherical graphite tailing is 22:13:65, the spherical graphite tailing accounts for 11% of the mass of the graphite mining waste stone, and the mass of the polycarboxylic acid water reducing agent accounts for 1.68% of the mass of the cement with the 52.5 grade;
wherein, the mould has a forming cavity of 4cm multiplied by 16cm (namely, the length and the width are both 4cm, and the height is 16 cm).
Example 13
The embodiment of the application provides a preparation method of an electric heating cement plate, which comprises the following steps:
s1, crushing the graphite mining waste rocks to a proper size fraction by a jaw crusher and a double-roller crusher;
s2, placing the graphite mining waste stone of the S1 into an ore grinding machine, and grinding for 15min at the rotating speed of 70r/min and the ore grinding mass fraction of 60%;
s3, mixing the graphite mining waste rocks after grinding according to the following grading table:
| size fraction/mm | 4.75 | 2.36 | 1.18 | 0.60 | 0.30 | 0.15 | 0.075 | 0.00 |
| Cumulative sift/percent | 3.36 | 55.47 | 75.37 | 82.35 | 86.50 | 91.65 | 96.31 | 100.00 |
；
S4, uniformly mixing the spherical graphite tailing, cement of 52.5 grade, water and a polycarboxylic acid water reducing agent in a stirring pot, adding the graphite mining waste stone ground in the step S3, continuously stirring, pouring the uniformly stirred material into a mold, inserting a stainless steel electrode net into two sides of the mold, compacting, curing at 20 ℃ for 2 days, demolding, continuously putting into a standard curing chamber for curing for 26 days, and drying at 50 ℃ after curing is finished to obtain the electric hot cement plate;
wherein the ratio of the mass of cement of grade 52.5 to the mass of water to the sum of the mass of graphite mining waste stone and spherical graphite tailing is 22:13:65, the spherical graphite tailing accounts for 7.4% of the mass of graphite mining waste stone, and the mass of polycarboxylic acid water reducing agent accounts for 1.52% of the mass of cement of grade 52.5;
wherein the mold has a molding cavity of 0.6cm × 16cm × 16cm (i.e., a length of 0.6cm, a width and a height of 16 cm).
The mass content (%) of stone powder in the graphite mining waste rock after ore grinding was tested according to the ore grinding treatment process in the above example 1 and examples 5 to 8, and the 28-day compressive strength (MPa), 28-day flexural strength (MPa), and 28-day oven-dry volume resistivity (Ω · m) of the electric cement board prepared according to the method in the above example 1 and examples 5 to 8, and the results are shown in table 1 below. Wherein the 28-day compressive strength, the flexural strength and the drying volume resistivity represent that the mold is demolded after curing for 2 days in the step S4, and curing is continued in a standard curing room for 26 days for 28 days in total.
TABLE 1-test results of different ore grinding mass fractions in examples 1 to 5
| Grinding mass fraction/%) | 40 | 50 | 60 | 70 | 80 |
| Stone dust mass content/%) | 15.44 | 18.54 | 17.71 | 16.78 | 17.25 |
| 28 days compressive strength (MPa) | 46.00 | 49.40 | 49.60 | 50.55 | 44.85 |
| 28 days rupture strength (MPa) | 7.80 | 8.20 | 8.50 | 8.30 | 8.00 |
| Volume resistivity (omega. m) after 28 days of drying | 393.46 | 472.91 | 384.22 | 390.95 | 393.05 |
The mass content (%) of stone powder in the graphite mining waste rock after ore grinding was tested according to the ore grinding treatment process in the above examples 1 to 5, and the 28-day compressive strength (MPa), 28-day flexural strength (MPa), 28-day drying volume resistivity (Ω · m) of the cement board prepared according to the method in the examples 1 to 5, and the results are shown in table 2 below. Wherein the 28-day compressive strength, the flexural strength and the drying volume resistivity represent that the mold is demolded after curing for 2 days in the step S4, and curing is continued in a standard curing room for 26 days for 28 days in total.
Table 2-results of the different grinding times in example 1 and examples 6 to 9
| Grinding time/min | 5 | 10 | 15 | 20 | 25 |
| Mass content of stone dust/%) | 10.94 | 13.53 | 17.10 | 18.38 | 19.17 |
| 28 days compressive strength (MPa) | 49.95 | 43.70 | 49.60 | 50.30 | 55.25 |
| 28 days rupture strength (MPa) | 6.60 | 7.70 | 8.50 | 8.50 | 7.80 |
| Volume resistivity (omega. m) after 28 days of drying | 334.65 | 281.53 | 384.22 | 385.41 | 388.67 |
As can be seen from the above tables 1-2, the electric heating plate with low mountain flour yield, high compressive and flexural strength and low volume resistivity can be obtained by grinding ore with the mass fraction of 60% for 10 min.
The final temperature and heating power of the electric cement boards prepared in examples 10 to 13 after being electrified with 36V ac voltage (i.e., the electrodes of the electric cement boards are connected with ac voltage), and the corresponding compressive strength, flexural strength and volume resistivity at the temperature were tested, and the results are shown in table 3 below.
TABLE 3-Properties of electric cement boards prepared in examples 10 to 13
The electric cement boards prepared in examples 10 to 13 were tested for temperature after different energization times after being energized with a 36V ac voltage, and the results are shown in table 4 below.
TABLE 4 temperatures of the electric cement boards prepared in examples 10 to 13 after different energization times
As can be seen from the above tables 3-4, when the 36V alternating-current voltage is applied, the electric cement board can reach a higher heating temperature at a higher speed for 1 hour, and can reach 40-92 ℃ with a heating power of 1.05W-12.23W for 2 hours, and the electric cement boards with different heating temperatures can be selected according to application places.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The preparation method of the electric heating cement plate is characterized by comprising the following steps:
crushing the graphite mining waste rocks in advance;
placing the crushed graphite mining waste stone into an ore mill for ore milling treatment;
mixing the graphite mining waste stone after the ore grinding treatment, cement, water and spherical graphite tailings, adding the mixture into a mold, inserting electrodes into two sides of the mold, demolding after curing, continuing curing, and drying to obtain the electric heating cement plate.
2. The method for preparing the electric heating cement plate as claimed in claim 1, wherein before mixing the graphite mining waste rock after the ore grinding treatment, the method further comprises the following step of proportioning the graphite mining waste rock after the ore grinding treatment according to the following grading table:
3. the method for preparing the electric heating cement plate as claimed in claim 1, wherein the ore grinding treatment of the crushed graphite mining waste stone in an ore grinding machine comprises: grinding at a rotation speed of 60-80r/min and a grinding mass fraction of 40-80% for 5-25 min.
4. The method for preparing the electric heating cement plate as claimed in claim 1, wherein the ratio of the mass of the cement to the mass of the water to the sum of the mass of the graphite mining waste rock and the mass of the spherical graphite tailings is (20-24) to (11-15) to (63-67), and the spherical graphite tailings are 7-14% of the mass of the graphite mining waste rock.
5. The method for preparing an electric cement plate as claimed in claim 1, wherein the ore-ground graphite mining waste stone, cement, water and spherical graphite tailings are mixed, and then added with a water reducing agent, and then added into a mold.
6. The method for preparing the electric heating cement plate as claimed in claim 1, wherein the electric heating cement plate is cured at 19-21 ℃ for 1-3 days and then demoulded.
7. The method for preparing the electric cement plate as claimed in claim 1, wherein the curing is continued in a standard curing room for 24-28 days.
8. The method for preparing the electric cement sheet according to claim 1, wherein the drying temperature is 45-55 ℃.
9. An electric cement board, characterized by being prepared by the preparation method according to any one of claims 1 to 8.
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| CN1226526A (en) * | 1997-12-03 | 1999-08-25 | 韩国能源技术研究所 | Electrically conductive graphite cement boards and process for producing the same |
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| WO2010059169A1 (en) * | 2008-11-24 | 2010-05-27 | Board Of Regents Of University Of Nebraska | Conductive concrete for heating and elelctrical safety |
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