A method for preparing silicon carbide from coal gangue and waste activated carbon

A technology for the preparation of activated carbon and coal gangue, applied in the direction of silicon carbide, carbide, etc., can solve the problem that coal gangue is difficult to use effectively and with high quality, and achieve the effect of large-scale industrial application value, reduction of production cost, and wide application.

Active Publication Date: 2020-05-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems that the existing coal gangue is difficult to be effectively and high-quality utilized, a utilization method of coal gangue waste with high economic value and environmentally friendly process is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Crush the waste coal gangue and pass it through 400 meshes, and dry it at 300°C for 24 hours. After all the water in the gangue has evaporated, compare it with the waste activated carbon treated at 1000°C for 1 hour in an argon atmosphere according to the mass ratio of coal Gangue: waste activated carbon = 1:1 uniform mixing to obtain mixed powder material;

[0038] 2) Disperse the mixed powder material obtained in the previous step in the mass ratio of powder: acid solution = 1:10 in the HCl acid solution with a concentration of 4mol / L, and stir at a temperature of 90°C for 10h , the stirring speed is 300r / min;

[0039] 3) The solid-liquid mixture obtained above is separated by suction filtration, and the mixed powder obtained after suction filtration is washed with hot water at 90° C., vacuum suction filtration, and repeated several times until the pH value of the liquid after washing reaches 7.0. After obtaining the mixed powder after impurity removal, dry it for...

Embodiment 2

[0042]1) Crush, grind and sieve coal gangue waste to obtain 300-400 mesh powder, dry at 150°C for 12 hours, and after all the internal water evaporates, treat it with 800°C under argon atmosphere 2h waste activated carbon is evenly mixed according to the mass ratio coal gangue: waste activated carbon = 1:0.5 to obtain a mixed powder material;

[0043] 2) Disperse the mixed powder material obtained in the previous step in the H concentration of 3mol / L according to the mass ratio of powder:acid solution=1:5 2 SO 4 solution, remove Al 2 o 3 For impurities, stir for 5 hours at a temperature of 70°C, and the stirring speed is 100r / min;

[0044] 3) The solid-liquid mixture obtained above is separated by suction filtration, and the mixed powder obtained after suction filtration is washed with hot water at 70° C., vacuum suction filtration, and repeated several times until the pH value of the liquid after washing reaches 7. After obtaining the mixed powder after impurity removal, ...

Embodiment 3

[0047] 1) Crush and grind the waste coal gangue to -200 mesh, and dry it at 100°C for 8 hours. After all the water in it evaporates, it is mixed with the waste activated carbon treated at 600°C for 5 hours under an argon atmosphere. The mass ratio of coal gangue: waste activated carbon = 1:2.0 is evenly mixed to obtain a mixed powder material;

[0048] 2) Disperse the mixed powder material obtained in the previous step in the HCl acid solution with a concentration of 5mol / L according to the mass ratio of powder:acid solution=1:8, and remove Al 2 o 3 Wait for soluble impurities, stir at 80°C for 8 hours, and the stirring speed is 200r / min;

[0049] 3) The solid-liquid mixture obtained above is separated by suction filtration, and the mixed powder obtained after suction filtration is washed with hot water at 80° C., vacuum suction filtration, and repeated several times until the pH value of the liquid after washing reaches 7. After obtaining the mixed powder after impurity rem...

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Abstract

The invention relates to a method for preparing silicon carbide from coal gangue and waste activated carbon, and particularly relates to a comprehensive utilization method for combining the coal gangue waste with the waste activated carbon. The method comprises the following steps: crushing and drying coal gangue, mixing the dried coal gangue with waste activated carbon subjected to treatment of acertain temperature according to a certain proportion, removing acid soluble impurities by using a strong acid solution, carrying out washing with hot water to neutral, carrying out drying, then carrying out heating to a certain temperature at a protective atmosphere, keeping the temperature for a period of time to obtain powder containing silicon carbide, oxidizing and combusting the powder an oxidizing atmosphere to remove residual carbon powder, dispersing the combusted powder into a mixed acid for removing residual silicon dioxide and other impurities, and carrying out washing and dryingto obtain the silicon carbide powder. The silicon carbide prepared by the method provided by the invention has high purity, small particle size and high industrial application value. At the same time,the industrial solid waste coal gangue and the waste activated carbon are as raw materials, so that positive significance is achieved in the direction of waste pollution reduction, environment protection, and resource recycle and reuse.

Description

Technical field: [0001] The invention relates to a method for preparing silicon carbide from coal gangue and waste activated carbon, in particular to a method for comprehensive utilization of coal gangue waste combined with waste activated carbon for industrial use. Background technique: [0002] Coal gangue is a rock mixed in the coal-measure strata, and it is a mixed rock with a lower carbon content than coal that is associated and symbiotic with the coal seam during the coal-forming process. The hoarding of gangue in my country has reached 7 billion tons, covering an area of ​​70 km 2 , and the annual emissions are increasing at a rate of 150 million tons. However, the comprehensive utilization of coal gangue is still less than 15%, and the remaining coal gangue is mostly stacked naturally and loosely around the mine in a conical or valley dumping manner. It has become one of the largest waste residues discharged in my country. A large amount of coal gangue piled up wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/97
CPCC01P2004/61C01P2004/62C01P2006/80
Inventor 肖劲张留运唐雷田忠良赖延清
Owner CENT SOUTH UNIV
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