Method for preparing silicon carbide from coal gangue and waste activated carbon

A technology for the preparation of activated carbon and coal gangue, which is 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 industrial application value, wide application, and reduced production costs

Active Publication Date: 2018-05-18
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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] 1) The coal gangue waste is crushed and passed through 400 meshes, dried for 24h at a temperature of 300℃, and after all the internal moisture has evaporated, compared with the waste activated carbon treated at 1000℃ for 1h in an argon atmosphere by mass. Gangue: waste activated carbon=1:1 uniformly mixed to obtain mixed powder material;

[0039] 2) Disperse the mixed powder material obtained in the previous step in a mass ratio of powder: acid solution = 1:10 in a HCl acid solution with a concentration of 4mol / L, and stir for 10 hours at a temperature of 90°C , The stirring speed is 300r / min;

[0040] 3) The solid-liquid mixture obtained above is separated by suction filtration. The mixed powder obtained after suction filtration is washed with hot water at 90°C and vacuum filtration, repeated several times until the pH value of the liquid after washing reaches 7.0. Obtain the mixed powder after impurity removal, and dry it at a temperature of 300°C for 24...

Example Embodiment

[0042] Example 2

[0043] 1) The coal gangue waste is crushed, pulverized and sieved to obtain 300-400 mesh powder, dried at a temperature of 150 ℃ for 12 hours, after all the internal moisture has evaporated, and treated at 800 ℃ in an argon atmosphere The 2h waste activated carbon is uniformly mixed according to the mass ratio of coal gangue: waste activated carbon=1:0.5 to obtain a mixed powder material;

[0044] 2) Disperse the mixed powder material obtained in the previous step in a mass ratio of powder: acid solution = 1:5 in a concentration of 3mol / L H 2 SO 4 In solution, remove Al 2 O 3 Impurities, stir at 70℃ for 5h, stirring speed is 100r / min;

[0045] 3) The solid-liquid mixture obtained above is separated by suction filtration. The mixed powder obtained after the suction filtration is washed with 70°C hot water and vacuum filtration, repeated several times until the pH value of the liquid after washing reaches 7. Obtain the mixed powder after impurity removal, and dry it...

Example Embodiment

[0047] Example 3

[0048] 1) Crush and grind the coal gangue waste to -200 mesh, and dry it for 8 hours at a temperature of 100°C. After all the internal moisture has evaporated, press it with the waste activated carbon treated at 600°C for 5 hours in an argon atmosphere. Mass ratio coal gangue: waste activated carbon=1:2.0 uniformly mixed to obtain mixed powder material;

[0049] 2) Disperse the mixed powder material obtained in the previous step in the mass ratio of powder: acid solution = 1:8 in the HCl acid solution with a concentration of 5mol / L to remove Al 2 O 3 Other soluble impurities, stir at 80℃ for 8h, stirring speed is 200r / min;

[0050] 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 and vacuum filtration, repeated several times until the pH value of the liquid after washing reaches 7. Obtain the mixed powder after impurity removal, and dry it for 12 h...

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PUM

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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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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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