Method of coproducing aluminium oxide, white carbon black and low ash carbon by coal gangue ecological utilization

A technology of coal gangue and alumina, applied in chemical instruments and methods, silicon oxide, inorganic chemistry, etc., can solve the problems of acid recycling, environmental pollution, and low alumina recovery rate, and can solve environmental pollution and The effect of occupying land, simple technology and high recovery rate

Inactive Publication Date: 2007-01-31
NINGXIA UNIVERSITY
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Problems solved by technology

However, this method is suitable for high-quality coal gangue (coal series kaolinite), that is, coal gangue with low carbon and iron content and high alumina content. For other low-quality coal gangue with large

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  • Method of coproducing aluminium oxide, white carbon black and low ash carbon by coal gangue ecological utilization

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Experimental program
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Effect test

Embodiment 1

[0023] Take by weighing 25 grams of 180 purpose coal gangue fine powder, this gangue aluminum oxide content is 27.58%, silicon dioxide is 34.96%, fixed carbon 34%, surplus is other impurity, adding 100ML concentration is the sulfuric acid solution of 12 mol / liter, Add 2.5 grams of fluorite, heat to a slight boil, and keep for 2 hours. Then add 100 ml of hot water at 80° C., stir for 10 minutes, and filter while hot to obtain a filtrate containing aluminum ions and a primary residue. Wash the residue with 40 ml of hot water for 2-3 times, combine the filtrate, add 9 grams of ammonium sulfate under strong stirring, stir to completely dissolve the ammonium sulfate, then heat and concentrate to a liquid volume of about 150 ml, cool to room temperature, and crystallize And isolate 42 grams of ammonium alum, and the mother liquor is left as a circulating acid solution to enter the next extraction and use. Add 50ML of 25% caustic soda solution to the residue once, heat to boil and k...

Embodiment 2

[0026] Replace the above-mentioned coal gangue with 25 grams of coal series kaolinite with a carbon content of less than 5%. The gangue has an alumina content of 35.6%, a silicon dioxide content of 41.6%, fixed carbon content of 3.5%, and the balance being other impurities. Add fluorine Ammonium chloride is 2 grams, and other process parameters are basically unchanged, but the concentration of acid-extracted alumina is adjusted to 9 mol / liter; the amount of caustic soda solution added when extracting silicon oxide from the residue is increased to 60ML. The results show that the extraction rate of alumina is 88%, the extraction rate of aluminum by silicon oxide is 98%, and the coal with ash content less than 15% can be recovered.

Embodiment 3

[0028] In embodiment 1, the ammonium sulfate added is changed into potassium sulfate, and other processes are unchanged. The analysis shows that the extraction rate of alumina is 81%, the average extraction rate of silicon oxide is 94%, and the coal with ash content less than 30% can be recovered.

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Abstract

The present invention relates to a method for coproducing alumina, white carbon black and low-ash carbon. Said method is characterized by that it uses the minerals of coal gangue and kaolinite containing different S:O2 and Al2O3 contents as raw material, and makes said raw material be undergone the processes of breaking, beating to make extraction by using sulfuric acid solution and separation so as to obtain aluminium sulfate solution, in the course of extraction and separation small quantity of fluoride as activating agent can be added, then the sulfate as cocrystallization agent is added in said solution, then the above-mentioned material is undergone the processes of concentration and crystallization so as to obtain high-grade alum salt crystal, at the same time the acid mother liquor can be circularly utilized to make next extraction, the residuum can be extracted by alkaline liquor to obtain silicon oxide and recover carbon. Said invention is simple, and the extraction rate of alumina is high, the high-grade aluminium salt can be easily obtained.

Description

technical field [0001] The invention relates to a method for extracting alumina and its by-products from coal gangue, in particular to a method for co-producing alumina, white carbon black, and low-ash carbon through the ecological utilization of coal gangue. Background technique [0002] Coal gangue, referred to as gangue for short, is a kind of hard black rock with low carbon content that is associated with coal seams during the coal formation process, and becomes waste in the coal production process. Coal gangue is the industrial waste with the largest annual emission and accumulated accumulation in my country. In the process of coal production, the discharge of coal gangue accounts for about 10% of coal production. The annual discharge of coal gangue in my country is about 200 million tons, accounting for about 40% of the total industrial solid waste in the country. There are still more than 1,500 coal gangue hills in the country, accumulatively stockpiling 3.4 billion ...

Claims

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Application Information

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IPC IPC(8): C01F7/26C01B33/113C01B31/02
Inventor 刘万毅
Owner NINGXIA UNIVERSITY
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