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Method for refining industrial salt

A technology of industrial salt and brine, applied in the purification of aluminum fluoride, aluminum halide, alkali metal halide, etc., can solve the problem of high cost, and achieve the effect of reducing refining cost, reducing dosage and saving cost

Inactive Publication Date: 2007-08-15
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, although the refining effect is better, the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take the mother liquor produced by the clay brine method to produce cryolite, and adjust it to a solution with a pH value of 6.0, then add industrial salt to the solution, fully dissolve to form turbid brine, and then filter to obtain pure industrial brine .

Embodiment 2

[0013] Take the mother liquor of cryolite produced by clay brine method and the mother liquor of cryolite produced by sodium fluorosilicate method, and adjust it to a solution with a pH value of 7.5, then add industrial salt to the solution, fully dissolve, and form cloudy brine, Then filter to get pure industrial brine.

Embodiment 3

[0015] Take the mother liquor of cryolite produced by clay brine method and the mother liquor of cryolite produced by sodium fluorosilicate method, and adjust it to a solution with a pH value of 8.0, then add industrial salt to the solution, fully dissolve, and form cloudy brine, Then filter to get pure industrial brine.

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PUM

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Abstract

This invention relates to a method of fuulyrefined industrial salt. The procedures are that waste water with fluorine is prepared to solution of pH=6-8, then industrial salt is added into the solution to get turbid salt water, pure salt water is got after filtration. The industrial salt water made by this invention can be used as material of clay bittern method to produce cryolite technique, materials can be cyclic used and cost is reduced. The content of calcium ion and magnesium ion in the industrial salt can be reduced from 1-2% to 0.01% and the content of calcium ion and magnesium ion in saturated industrial salt water can be reduced from 3g / l to below 0.03g / l.

Description

technical field [0001] The invention relates to a method for refining industrial salt, in particular to a method for refining industrial salt, the raw material for producing cryolite by clay brine method. Background technique [0002] At present, the industrial salt used in industrial production contains impurities such as calcium ions and magnesium ions, which must be refined to remove impurities such as calcium ions and magnesium ions in the application process. The traditional refining method is to make industrial salt into a saturated solution, and then add OH - or CO 3 2- , so that calcium ions and magnesium ions form carbonate or hydroxide precipitation under alkaline conditions, and pure brine is obtained after separation. In this way, although the refining effect is better, the cost is higher. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide a method for refining industrial salt, to reduce the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/16C01F7/54
Inventor 李世江侯红军杨华春皇甫根利于贺华
Owner DO FLUORIDE CHEM CO LTD
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