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Method for producing sodium fluoride

A production method and sodium fluoride technology, applied in the field of sodium fluoride production, can solve the problems of poor product quality, short reaction process, high cost, etc., and achieve the effect of good product quality, short process and low cost

Inactive Publication Date: 2009-03-04
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The neutralization method is to neutralize hydrofluoric acid with soda ash or caustic soda. The reaction process is short, easy to control, and the product quality is good, but it has the disadvantage of high cost; the sodium fluorosilicate method uses sodium fluorosilicate to decompose in an alkaline solution. Yes, the cost is low, but the process is longer and the product quality is poor

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  • Method for producing sodium fluoride

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Effect test

Embodiment 1

[0020] The production method of sodium fluoride of the present invention is to take ammonium fluoride, sodium hydroxide as raw material, comprises the following steps:

[0021] (1) Add the ammonium fluoride solution with a concentration of 45% and the sodium hydroxide solution with a concentration of 35% into the reaction kettle at the same time in a molar ratio of 1:1, the feeding time is 15 minutes, and then stir for 30 minutes after feeding, Prepare sodium fluoride slurry;

[0022] (2) Filter the obtained sodium fluoride slurry to obtain sodium fluoride ointment, and dry the magnesium fluoride ointment at a temperature of 200° C. for 2 hours to obtain high-quality sodium fluoride;

[0023] (3) Concentrating the mother liquor to crystallize the sodium fluoride in the mother liquor to obtain a sodium fluoride product.

[0024] Among them, ammonium fluoride is obtained by ammonolysis of fluosilicic acid, a by-product of phosphate fertilizer.

[0025] The ammonia gas released...

Embodiment 2

[0027] The production method of sodium fluoride of the present invention is to take ammonium fluoride, sodium hydroxide as raw material, comprises the following steps:

[0028] (1) Add the ammonium fluoride solution with a concentration of 30% and the sodium hydroxide solution with a concentration of 25% into the reaction kettle at the same time in a molar ratio of 1:1, the feeding time is 30 minutes, and then stir for 15 minutes after feeding, Prepare sodium fluoride slurry;

[0029] (2) Filter the obtained sodium fluoride slurry to prepare sodium fluoride ointment, and dry the magnesium fluoride ointment at a temperature of 250° C. for 1.5 hours to obtain high-quality sodium fluoride;

[0030] (3) Concentrating the mother liquor to crystallize the sodium fluoride in the mother liquor to obtain a sodium fluoride product.

[0031] Among them, ammonium fluoride is obtained by ammonolysis of fluosilicic acid, a by-product of phosphate fertilizer.

[0032] The ammonia gas relea...

Embodiment 3

[0034] The production method of sodium fluoride of the present invention is to take ammonium fluoride, sodium hydroxide as raw material, comprises the following steps:

[0035] (1) Add the ammonium fluoride solution with a concentration of 25% and the sodium hydroxide solution with a concentration of 30% into the reaction kettle at the same time in a molar ratio of 1:1, the feeding time is 30 minutes, and then stir for 15 minutes after feeding, Prepare sodium fluoride slurry;

[0036] (2) Filter the obtained sodium fluoride slurry to prepare sodium fluoride ointment, and dry the magnesium fluoride ointment at a temperature of 300° C. for 1 hour to obtain high-quality sodium fluoride;

[0037] (3) Concentrating the mother liquor to crystallize the sodium fluoride in the mother liquor to obtain a sodium fluoride product.

[0038] Among them, ammonium fluoride is obtained by ammonolysis of fluosilicic acid, a by-product of phosphate fertilizer.

[0039] The ammonia gas released...

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Abstract

The invention relates to a manufacturing method of sodium fluoride, which takes ammonium fluoride and sodium hydroxide as raw material and comprises the steps as follows: (1) an ammonium fluoride solution whose concentration is 20 to 50 percent and a sodium hydroxide solution whose concentration is 20 to 35 percent are added in a reaction kettle at the same time; the material feeding time is 15 to 30 minutes, the stirring is conducted for 15 to 30 minutes after the material feeding, and a sodium fluoride ground-paste is prepared; (2) the obtained sodium fluoride ground-paste is filtered to prepare a sodium fluoride paste which is dried for 1 to 2 hours at the temperature ranging from 100 to 300 DEG C to obtain the sodium fluoride with excellent quality; (3) a mother solution which is processed through filtration is concentrated to lead the sodium fluoride in the mother solution to be crystallized to obtain a sodium fluoride product. Compared with the neutralization method, the manufacturing method of the sodium fluoride has obvious advantage on the price; compared with the sodium fluosilicate method, the ammonium fluoride has extremely low silicon dioxide content, the product quality is easy to be controlled during the production process, the flow is short, and the product quality is better. In addition, the manufacturing method generates no three wastes during the reaction process, and has remarkable environmental protection benefit; a product which is generated during the reaction process can be recycled, thereby lowering the manufacturing cost to a certain extent.

Description

technical field [0001] The invention relates to a method for producing sodium fluoride, in particular to a method for producing sodium fluoride with ammonium fluoride and sodium hydroxide as raw materials. Background technique [0002] Sodium fluoride is a colorless bright crystal or powder, soluble in water, slightly soluble in alcohol, the aqueous solution is alkaline, can corrode glass, dissolve in hydrofluoric acid, and form sodium bifluoride, which is a flux for aluminum smelting and welding. Medical and wood preservatives, brewing fungicides, agricultural insecticides and fluoridation treatment agents for drinking water, can also be used for pickling of steel and stainless steel, raw materials for making other fluorides, and also used in the enamel pharmaceutical industry, etc. . [0003] The existing sodium fluoride production methods mainly include: neutralization method and sodium fluorosilicate method. The neutralization method is to neutralize hydrofluoric acid ...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01C1/02
Inventor 皇甫根利李世江侯红军杨华春闫春生贾雪峰范晓磊
Owner DO FLUORIDE CHEM CO LTD
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