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Method for simultaneously producing sodium aluminofluoride and silica white

A technology of white carbon black and cryolite, applied in the field of co-production of cryolite and white carbon black, which can solve the problems of high sodium ion content, poor transparency, and environmental pollution

Inactive Publication Date: 2006-06-14
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: due to the high temperature required for the reaction, the reaction of synthesizing fluoroaluminic acid is violent, the operation is not easy to control, and accidents of leaking tanks and hurting people are prone to occur; and because the entire production is carried out under acidic conditions, and The temperature is high, the equipment is severely corroded, and acid waste residue is produced, polluting the environment
[0011] The disadvantages of this process are: (1) using sodium fluorosilicate and dilute ammonia water to react white carbon black seed crystals, since sodium fluorosilicate is a solid phase, the reaction is not complete, and the content of sodium ions in the prepared seed crystals Larger, poor seed crystal quality, and there are solid particles, poor transparency, whitish color
(2) The white carbon black slurry obtained by using sodium fluorosilicate to make seed crystals has more crystals of sodium fluoride, which is inconvenient for washing and separation, which greatly affects the purity of white carbon black
(3) The prepared cryolite molecules are relatively high, generally above 2.8, and cannot be adjusted downwards, so they can only be used in the slotting stage of electrolytic aluminum production

Method used

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  • Method for simultaneously producing sodium aluminofluoride and silica white
  • Method for simultaneously producing sodium aluminofluoride and silica white

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the method for preparing cryolite co-production white carbon black in the present invention is: add ice mother and ammoniacal liquor to water and prepare dilute ammoniacal liquor, filter to obtain the dilute ammoniacal liquor that concentration is 0.8mol / l, mix fluosilicic acid solution with prepared dilute ammoniacal liquor Ammonia reaction is made white carbon black seed crystal, and the pH value of white carbon black seed crystal is controlled as 6.2, and reaction temperature is 32 ℃; Add 25% white carbon black seed crystal in the ammonolysis tank, and add ice mother, then In the presence of seed crystals, sodium fluorosilicate and ammonia water are subjected to ammonolysis reaction at a temperature of 58°C, the pH value at the end of the reaction is greater than 8.0, and the white carbon black slurry generated by the ammonolysis reaction is filtered and washed to obtain white Carbon black ointment, the filtrate is a mixed solution of ammon...

Embodiment 2

[0032] Such as figure 1 As shown, the method for preparing cryolite co-production white carbon black of the present invention is: add ice mother and ammoniacal liquor to water and prepare dilute ammoniacal liquor, filter to obtain the dilute ammoniacal liquor that concentration is 0.9mol / l, mix fluosilicic acid solution with prepared dilute ammoniacal liquor Ammonia reaction is made white carbon black seed crystal, and the pH value of white carbon black seed crystal is controlled as 7.0, and reaction temperature is 35 ℃; Add 33% white carbon black seed crystal in the ammonolysis tank, and add ice mother, then In the presence of seed crystals, sodium fluorosilicate and ammonia water are subjected to ammonolysis reaction at a temperature of 60°C, the pH value at the end of the reaction is greater than 8.0, and the white carbon black slurry generated by the ammonolysis reaction is filtered and washed to obtain white Carbon black ointment, the filtrate is a mixed solution of ammon...

Embodiment 3

[0034] Such as figure 1As shown, the method for preparing cryolite co-production of white carbon black in the present invention is: add ice mother and ammoniacal liquor to water to prepare dilute ammoniacal liquor, filter the dilute ammoniacal liquor that concentration is 1.0mol / l, mix fluosilicic acid solution with prepared dilute ammoniacal liquor Ammonia reaction is made white carbon black seed crystal, and the pH value of white carbon black seed crystal is controlled as 7.6, and reaction temperature is 40 ℃; Add 40% white carbon black seed crystal in the ammonolysis tank, and add ice mother, then In the presence of seed crystals, sodium fluorosilicate and ammonia water are subjected to ammonolysis reaction at a temperature of about 62 ° C. The pH value at the end of the reaction is greater than 8.0. The white carbon black slurry generated by the ammonolysis reaction is filtered and washed to obtain White carbon black ointment, the filtrate is a mixed solution of ammonium f...

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Abstract

The invention relates to a method for producing cryolite co-production of white carbon black, which comprises the following steps: (1) adding ice mother and ammonia water to water to prepare dilute ammonia water, reacting fluosilicic acid solution with dilute ammonia water to prepare white carbon black Carbon black seed crystals, the pH value of the white carbon black seed crystals is controlled between 6-8, and the reaction temperature is 30-40°C; (2) Add a certain amount of white carbon black seed crystals to the ammonolysis tank, wherein the crystals The amount of seed added can be adjusted as needed, and an appropriate amount of ice mother is added. Under the condition of the presence of seed crystals, sodium fluorosilicate and ammonia water are subjected to ammonolysis reaction at a temperature of about 60 ° C, and the pH value at the end of the reaction is greater than 8.0 , the white carbon black slurry that ammonolysis reaction generates is filtered, washed to obtain white carbon black ointment, wherein filtrate is ammonium fluoride, sodium fluoride mixed solution, and white carbon black ointment is dried to obtain white carbon black finished product; (3) will The mixed solution of ammonium fluoride and sodium fluoride produced by the ammonolysis reaction reacts with the sodium aluminate solution at a temperature of 80-100°C to form a cryolite slurry, which is filtered and dried to obtain a finished product of cryolite.

Description

technical field [0001] The invention relates to a method for producing cryolite and co-producing white carbon black. Background technique [0002] The chemical name of cryolite is sodium fluoroaluminate, and the molecular formula is Na 3 AlF 6 , It is mainly used in industry as a flux for aluminum smelting, in the silicate industry as an opalescent agent for glass and enamel, and in agriculture as a pesticide. The main raw material used in the aluminum smelting industry in the world is cryolite . The traditional production process of cryolite is the soda ash-fluoroaluminic acid method. First, hydrofluoric acid is reacted with aluminum hydroxide to form fluoroaluminic acid, and then reacted with soda ash to form cryolite. The chemical reaction formula is as follows: [0003] <chemistry num="001"> <chem file="03118447_cml001.xml" / > < / chemistry> [0004] <chemistry num="002"> <chem file="03118447_cml002.xml" / > < / chemistry> [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/54C01B33/113
Inventor 李世江候红军杨华春李海生张富山皇甫根利
Owner DO FLUORIDE CHEM CO LTD
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