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Method for preparing sodium fluoride

A sodium fluoride and sodium carbonate technology, applied in the direction of alkali metal fluoride, can solve the problems of complex production methods, long process routes, and high raw material consumption, and achieve the effects of convenient operation, simple process, and pollution reduction

Inactive Publication Date: 2017-05-31
衡阳市锦轩化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods have long process routes, complex production methods, and high raw material consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing sodium fluoride, comprising the steps of:

[0022] (1) Weigh sodium carbonate and grind it to 200 mesh, then dissolve it in water to make an aqueous solution of sodium carbonate and store it at 30°C for later use;

[0023] (2) put H 2 SiF 6 Mix with an appropriate amount of mother liquor, which is filtered by H 2 SiF 6 When the filtrate obtained, the mother liquor and H 2 SiF 6 The mass ratio is 5:1, add it into a three-necked flask to make a suspension, start stirring, heat up to 85°C, and slowly add Na prepared in step (1) into the three-necked flask with a dropping funnel. 2 CO 3 solution, Na 2 CO 3 The drip rate of the solution was 10ml / min, and the feeding time was 10 minutes; during the operation, the temperature was controlled at 90°C, and the reaction time was 150 minutes until no bubbles were generated in the reaction solution;

[0024] (3) Turn on the stirring, control pH = 6.6 during stirring, heat and stir at 85°C for 30 minut...

Embodiment 2

[0027] A method for preparing sodium fluoride, comprising the steps of:

[0028] (1) Weigh sodium carbonate and grind it to 300 mesh, then dissolve it in water to make an aqueous solution of sodium carbonate and store it at 40°C for later use;

[0029] (2) put H 2 SiF 6 Mix with an appropriate amount of mother liquor, which is filtered by H 2 SiF 6 When the filtrate obtained, the mother liquor and H 2 SiF 6 The mass ratio is 6:1, add it into a three-necked flask to make a suspension, start stirring, heat up to 87°C, and slowly add Na prepared in step (1) into the three-necked flask with a dropping funnel. 2 CO 3 solution, Na 2 CO 3 The dropping rate of the solution was 25ml / min, and the feeding time was 20 minutes; during the operation, the temperature was controlled at 93°C, and the reaction time was 180 minutes until no bubbles were generated in the reaction solution;

[0030] (3) Start stirring, control pH = 7.0 during stirring, heat and stir at 87 °C for 50 min, l...

Embodiment 3

[0033] A method for preparing sodium fluoride, comprising the steps of:

[0034] (1) Weigh sodium carbonate and grind it to 260 mesh, then dissolve it in water to make an aqueous solution of sodium carbonate and store it at 35°C for later use;

[0035] (2) put H 2 SiF 6 Mix with an appropriate amount of mother liquor, which is filtered by H 2 SiF 6 When the filtrate obtained, the mother liquor and H 2 SiF 6 The mass ratio is 6:1, add it into a three-necked flask to make a suspension, start stirring, heat up to 86°C, and slowly add Na prepared in step (1) into the three-necked flask with a dropping funnel. 2 CO 3 solution, Na 2 CO 3 The drip rate of the solution is 10-25ml / min, and the feeding time is 15 minutes; during the operation, the temperature is controlled at 92°C, and the reaction time is 160 minutes, until no bubbles are generated in the reaction solution;

[0036] (3) Turn on the stirring, control pH = 6.8 during stirring, heat and stir at 85-87 °C for 40 mi...

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Abstract

The invention discloses a method for preparing sodium fluoride. The method comprises the following steps: (1) dissolving sodium carbonate in water so as to prepare a sodium carbonate solution; (2) mixing H2SiF6 with a proper amount of mother liquor so as to prepare a suspension, stirring, heating to 85-87 DEG C, and slowly dropping the Na2CO3 solution prepared in the step (1) into a 3-neck flask by using a solution funnel; (3) starting stirring, performing heating stirring for 30-50 minutes at 85-87 DEG C, leaving to stand, performing heat-preservation aging for 0.5-1 hour, filtering, and washing so as to obtain a mixture of solid sodium fluoride and a byproduct silica; (4) separating the mixture by using a gravity settlement method, thereby obtaining a solid sodium fluoride product. The method is simple in process and convenient to operate, raw materials such as sodium hydroxide, hydrochloric acid or ammonium bicarbonate added in a two-step method are not needed, and compared with a conventional production method, the quality is ensured, pollution is reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of sodium fluoride preparation, in particular to a method for preparing sodium fluoride. Background technique [0002] At present, sodium fluoride (NaF) is an important fluoride salt, mainly used in agricultural pesticides, wine industry fungicides, fermentation disinfectants, wood preservatives, electrolytic aluminum mediators, toothpaste fluorides, ceramics Pigment, light metal fluoride salt treatment agent, smelting and refining, and protective layer, etc. White carbon black (silicon dioxide) can be used in rubber to have a reinforcing effect similar to carbon black. It is used as a thickener and thixotropic agent in the plastics industry, and is also used in paint, pesticide, medicine, food, feed and papermaking industries. Phosphate fertilizer production in my country produces a large amount of fluosilicic acid, most of which are recovered in the form of sodium fluosilicate, but sodium fluosilicate has...

Claims

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Application Information

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IPC IPC(8): C01D3/02
Inventor 贺军陈新文张群志罗小平
Owner 衡阳市锦轩化工有限公司
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