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Method for extracting aluminum oxide from fly ash and coproducing cement by carbide slag or cyanamide slag

A technology for calcium carbide slag and fly ash, which is applied in the field of extracting alumina and co-producing cement, can solve problems such as increasing production costs, and achieve the effect of reducing mining

Inactive Publication Date: 2007-12-12
张克嶷
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Problems solved by technology

[0005] The above aluminum production process is no different from the traditional method, and limestone is still needed as raw material, which increases the production cost

Method used

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Experimental program
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Embodiment Construction

[0012] 1. The process of extracting alumina

[0013] 1) Ingredients process

[0014] Table 1 shows the components of fly ash and cyanamide slag. According to theoretical calculations, 3000 kg of fly ash and 6060 kg of carbide slag are required to extract 1000 kg of alumina. Slurry and sand should be separated by a mud washing machine. After separation, the particles of calcium carbide slag slurry are very fine, and they do not need to be ground again. They are directly poured into the slurry warehouse for preparation. 60% of the fly ash is powdered and 40% is granular. The two kinds of slurry are mixed according to the pre-calculated ratio, and then sent to the mixing tank for homogenization with machine rake and compressed air.

[0015] Table 1 Composition of fly ash and carbide slag

[0016] Al 2 o 3

SiO 2

CaO

CO 2

Fe 2 o 3

C

C a f 2

MgO

CN 2 h 2

RO

SO 3

That

...

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Abstract

The invention provides a method for extracting alumina cement from dust coal by using carbide mud residue. It is characterized in that it takes aluminum- rich dust coal as aluminum source, and carbide mud residue or cyandiamide slag as calcium source, produces calcium aluminate and calcium aluminate sintering material through sintering, and prepares alumina through processes of soda digestion, de-silicon, removing carbon and sintering. The produced slag is used as silicon and calcium material for cement production, the sintering of carbide mud residue or cyandiamide slag and dust coal is carried out with wet grinding and dry coking process. The invention employs carbide mud residue or cyandiamide slag to replace lime carbonate and be used as medium for alumina extraction, which on one hand reduces lime carbonate mining, and on the other hand makes full use of s carbide mud residue or cyandiamide slag.

Description

[0001] Technical field: the invention belongs to the technical field of inorganic chemical industry, and relates to a method for extracting alumina from fly ash to produce cement by using carbide slag. Background technique: [0002] The extraction of alumina from fly ash started in Europe in the 1960s. This process is called "Gerimek-Tatabon Method" ("Gerta Method" for short). Firstly, fly ash and limestone are mixed and calcined to form a sintered material of calcium aluminate and calcium silicate, and then soda ash (sodium carbonate) solution is used to convert the calcium aluminate in the sintered material into soluble sodium aluminate, sodium hydroxide and Solid calcium carbonate, after solid and liquid separation, carbon dioxide is passed into the filtrate, sodium aluminate becomes solid aluminum hydroxide and sodium carbonate, sodium hydroxide becomes sodium carbonate and remains in the solution for recycling, hydroxide The aluminum is sent to a calciner to remove moistu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C04B7/24
CPCY02P40/10
Inventor 张克嶷
Owner 张克嶷
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