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Method for utilizing coal gangue waste

A technology for coal gangue and waste, which is applied in the field of resource regeneration and utilization, can solve problems such as the difficulty of efficient and high-quality utilization of coal gangue, and achieve the effects of large-scale industrial application value, production cost reduction, and wide use.

Active Publication Date: 2018-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 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

[0038] A method for utilizing coal gangue waste, the specific steps are as follows:

[0039] 1) Crush and grind coal gangue waste and waste cathode carbon blocks from the aluminum electrolysis industry to -400 mesh respectively, and dry them at 300°C for 24 hours. : Cathode carbon block=1:1 is evenly mixed to obtain mixed powder material;

[0040] 2) Disperse the mixed powder material obtained in the previous step in the mass ratio of powder: lye = 1:10 in NaOH lye with a concentration of 4mol / L, and stir at 90°C for 10h , the stirring speed is 300r / min;

[0041]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. After obtaining the mixed powder after impurity removal, dry it for 24 hours at a temperature of 300°C, and wait until all the water in it...

Embodiment 2

[0044] A method for utilizing coal gangue waste, the specific steps are as follows:

[0045] 1) Separately crush the coal gangue waste and the waste cathode carbon block from the aluminum electrolysis industry, grind and sieve to obtain a 300-400 mesh powder, and dry it at a temperature of 150°C for 12 hours. After all the internal water evaporates, Mix evenly according to the mass ratio of coal gangue: cathode carbon block = 1:0.5 to obtain a mixed powder material;

[0046] 2) Disperse the mixed powder material obtained in the previous step in a mass ratio of powder: lye = 1:5 in NaOH lye with a concentration of 3mol / L to remove Al 2 o 3 Wait for impurities, stir at a temperature of 70°C for 5 hours, and the stirring speed is 100r / min;

[0047] 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...

Embodiment 3

[0050] A method for utilizing coal gangue waste, the specific steps are as follows:

[0051] 1) Crush and grind coal gangue waste and waste cathode carbon blocks from the aluminum electrolysis industry to -300 mesh respectively, and dry them at 100°C for 8 hours. : cathode carbon block=1:2.0 uniformly mixed to obtain mixed powder material;

[0052] 2) Disperse the mixed powder material obtained in the previous step in a mass ratio of powder: lye = 1:8 in NaOH lye with a concentration of 5mol / L to remove Al 2 o 3 For impurities, stir for 8 hours at a temperature of 80°C, and the stirring speed is 200r / min;

[0053] 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. The mixed powder obtained after impurity removal was dried at 200°C for 12 hours to ...

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Abstract

The invention relates to a comprehensive utilization method for coal gangue waste combined with spent cathode carbon blocks in the aluminum electrolysis industry. The method comprises the following concrete steps: smashing coal gangue and the spent cathode carbon blocks into powder, drying, then burdening in a certain proportion, removing alkaline soluble impurities in a mixed material by using astrong alkali liquid, washing to be neutral with hot water, drying, then in an inert or reducing atmosphere, heating to 1400-1700 DEG C, carrying out heat preservation for a period of time, so that mixed powder containing silicon carbide is obtained, then oxidizing and combusting the powder in an oxidizing atmosphere for removing residual carbon powder, dispersing the obtained powder into hydrofluoric acid for removing residual silicon dioxide, cleaning, and drying, so that silicon carbide powder can be obtained. The obtained silicon carbide product is high in purity and small in particle sizeand has extremely high industrial application value; meanwhile, industrial solid wastes coal gangue and spent cathode carbon blocks are taken as raw materials, so that the method provided by the invention has positive significance in directions of reducing waste pollution, protecting the environment and recycling resources.

Description

Technical field: [0001] The invention relates to a utilization method of coal gangue waste, in particular to the technical field of harmless treatment of coal gangue waste combined with waste cathode carbon blocks of the aluminum electrolysis industry and resource regeneration and utilization. Background technique: [0002] Coal gangue is a rock mixed in the coal-measure strata. It is a black rock with lower carbon content and harder than coal that is associated with the coal seam during the coal-forming process. It is a mixture of inorganic matter and a small amount of organic matter. The accumulation 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 o...

Claims

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Application Information

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IPC IPC(8): C01B32/963
CPCC01P2004/62
Inventor 肖劲张留运唐雷田忠良赖延清
Owner CENT SOUTH UNIV
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