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Method for producing sodium fluoride

A production method, sodium fluoride technology, applied in the direction of alkali metal fluoride, silicon oxide, etc., can solve the problem of high production cost

Inactive Publication Date: 2008-03-05
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional production method of sodium fluoride is to use sodium fluorosilicate and soda ash as raw materials, react sodium fluorosilicate and soda ash in the water phase to generate a mixture slurry of sodium fluoride and silicon dioxide, and separate the two according to gravity sedimentation , get sodium fluoride product, its production cost is higher

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] The production method of the sodium fluoride of the present embodiment, take fluosilicic acid and sodium chloride as raw material, comprise the following steps:

[0019] (1) react 10% fluosilicic acid solution and sodium chloride solid at normal temperature for 30 minutes, after the reaction is finished, filter to obtain sodium fluosilicate solid and return for decomposition reaction, and discharge the hydrochloric acid waste liquid;

[0020] (2) Decompose sodium fluorosilicate at 350°C for 4 hours to generate sodium fluoride solid and silicon tetrafluoride gas;

[0021] (3) Absorb and hydrolyze silicon tetrafluoride gas with water, filter to obtain 10% fluorosilicic acid solution and silicon dioxide solid, 10% fluorosilicic acid solution can be used as raw material and then put into use, wash and dry the silicon dioxide solid to obtain Silica.

Embodiment 2

[0023] The production method of the sodium fluoride of the present embodiment, take fluosilicic acid and sodium chloride as raw material, comprise the following steps:

[0024] (1) React 20% fluosilicic acid solution and 30% sodium chloride solution at room temperature for 20 minutes. After the reaction, filter to obtain sodium fluosilicate solid and return it for decomposition reaction. Hydrochloric acid waste liquid is treated and discharged ;

[0025] (2) Decompose sodium fluorosilicate at 450°C for 3 hours to generate sodium fluoride solid and silicon tetrafluoride gas;

[0026] (3) Absorb silicon tetrafluoride gas with water and hydrolyze it, filter to obtain 20% fluosilicic acid solution and silicon dioxide solid, 10% fluosilicic acid solution can be used as raw material and then put into use, wash and dry the silicon dioxide solid Obtain white carbon black.

Embodiment 3

[0028] The production method of the sodium fluoride of the present embodiment, take fluosilicic acid and sodium chloride as raw material, comprise the following steps:

[0029] (1) React 35% fluosilicic acid solution and 20% sodium chloride solution at room temperature for 15 minutes. After the reaction is over, filter to obtain sodium fluosilicate solid and return it for decomposition reaction, and discharge the hydrochloric acid waste liquid ;

[0030] (2) Decompose sodium fluorosilicate at 750°C for 2 hours to generate sodium fluoride solid and silicon tetrafluoride gas;

[0031] (3) Absorb silicon tetrafluoride gas with water and hydrolyze it, filter to obtain 35% fluorosilicic acid solution and silicon dioxide solid, 10% fluorosilicic acid solution can be used as raw material and then put into use, wash and dry the silicon dioxide solid to obtain Silica.

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PUM

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Abstract

The present invention relates to process of producing sodium fluoride with fluorosilicic acid and sodium chloride as material. The process includes the following steps: 1. reacting fluorosilicic acid solution and sodium chloride for 10-30 min, filtering to obtain solid sodium fluorosilicate and waste hydrochloric acid solution to be treated and drained; 2. decomposing sodium fluorosilicate at 300-800 deg.c for 1-5 hr to produce solid sodium fluoride product and silicon tetrafluoride gas; and 3. absorbing silicon tetrafluoride gas with water and hydrolyzing, filtering to obtain fluorosilicic acid solution and solid silica, and washing and drying silica to obtain carbon white. The process utilizes fluorosilicic acid as one side product of phosphate fertilizer production as one main material, and has low cost and environment friendship.

Description

technical field [0001] The invention relates to a production method of sodium fluoride, in particular to a method for producing sodium fluoride by using fluosilicic acid and sodium chloride as raw materials. Background technique [0002] Sodium fluoride, molecular formula NaF, used in the manufacture of boiling steel, fluoridation of drinking water, pesticides, smelting and refining of light metals and as a protective layer, cleaning fluid for steel and other metals, brazing flux and flux, ceramics, glass and Fluxes and opacifiers for enamel, hide and skin treatment in the tanning industry, wood preservation, glue preservation. The traditional production method of sodium fluoride is to use sodium fluorosilicate and soda ash as raw materials, react sodium fluorosilicate and soda ash in the water phase to generate a mixture slurry of sodium fluoride and silicon dioxide, and separate the two according to gravity sedimentation , to obtain sodium fluoride product, its production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02C01B33/113
Inventor 李世江侯红军杨华春皇甫根利闫春生范晓磊贾雪枫
Owner DO FLUORIDE CHEM CO LTD
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