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Method for producing cryolite

A technology of cryolite and ammonium fluoroaluminate, which is applied in the direction of aluminum fluoride, aluminum halide, etc., can solve the problems of severe equipment corrosion, high equipment requirements, and difficult operation control, and achieve high production safety, reduce production costs, and respond The effect of mild conditions

Inactive Publication Date: 2003-11-19
DO FLUORIDE CHEM CO LTD
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Problems solved by technology

The disadvantages of this process are: (1) more process steps, more equipment required, higher requirements on equipment (acid resistance, high temperature resistance), and large equipment investment; (2) the reaction of synthetic fluoroaluminic acid is violent, and the operation is not easy to control (3) The whole production process is carried out under strong acidic conditions, which seriously corrodes the equipment, and produces acidic waste residue, which pollutes the environment; (4) The price of raw materials is high and the cost is high

Method used

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  • Method for producing cryolite
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Embodiment 1

[0014] Embodiment 1, a kind of method for producing cryolite, comprises the steps: (1) preparation soda ash aqueous solution, adds soda ash with deionized water or the circulation mother liquor in the reaction process and is made into the soda ash solution of soda ash content 20%; (2) ice crystal Stone synthesis, after adding deionized water or part of the mother liquor into the synthesis tank, add aluminum profile surface treatment waste residue - ammonium fluoroaluminate (purity 98%) under constant stirring, so that the concentration reaches 20%, open the steam valve, and pass the steam Make its temperature rise to 90°C, slowly add the sodium carbonate solution from the metering tank to the synthesis tank for reaction, the feeding time is 40 minutes, the molar ratio of ammonium fluoroaluminate to soda ash is 2:3, and cryolite slurry is obtained after the reaction is completed; (3 ) The cryolite slurry is filtered with a horizontal spiral centrifuge to obtain an ointment (less...

Embodiment 2

[0015] Embodiment 2. In this embodiment, the concentration of soda ash is 15%, the concentration of ammonium fluoroaluminate is 15%, the reaction temperature of cryolite synthesis is 95°C, the feeding time is 50 minutes, and the drying temperature of ointment is 200°C. Others are the same as embodiment 1.

Embodiment 3

[0016] Embodiment 3 In this embodiment, the concentration of soda ash is 25%, the concentration of ammonium fluoroaluminate is 25%, the cryolite synthesis reaction temperature is 95°C, the feeding time is 45 minutes, and the ointment drying temperature is 300°C. Others are the same as embodiment 1.

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Abstract

A process for preparing cryolite includes such steps as reacting between ammonium fluoroaluminate and sodium carbonate in water plase at 90-100 deg.C, filtering, and drying at 150-300 deg.C. The gas generated by reaction can be absorbed to obtain by-product. Its advantages are simple process and no environmental pollution.

Description

technical field [0001] The invention relates to a method for producing cryolite. The method can use ammonium fluoroaluminate as a raw material, which is waste slag from surface treatment of aluminum profiles. Background technique [0002] The chemical name of cryolite is sodium fluoroaluminate, and the molecular formula is Na 3 AlF 6 . It is divided into natural and man-made. It is mainly used as a cosolvent for aluminum smelting in industry, as an opalescent agent for making glass and enamel in the silicate industry, and as a pesticide in agriculture. The world's aluminum smelting industry mainly uses artificial cryolite. The traditional production process of artificial cryolite is soda ash-fluoroaluminic acid method. First, hydrofluoric acid and aluminum hydroxide react to form fluoroaluminic acid, and then use fluoroaluminic acid to react with soda ash to form cryolite. The chemical reaction formula is as follows: [0003] <chemistry num="001"> <chem file="...

Claims

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Application Information

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IPC IPC(8): C01F7/54
Inventor 杨华春李世江李海生皇甫根利李克平侯红军张富山
Owner DO FLUORIDE CHEM CO LTD
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