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Preparation method of sodium fluoride

A technology of sodium fluoride and potassium fluoride, applied in the direction of alkali metal fluoride, etc., can solve the problems of high cost, complicated separation of sodium fluoride and silicon dioxide, etc., and achieve the effect of reducing production cost and reducing cost

Active Publication Date: 2011-04-06
BAIYIN ZHONGTIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN101717097A discloses a preparation method of sodium fluoride, which uses sodium fluorosilicate and soda ash to react in the water phase, and the generated silicon dioxide and sodium fluoride form a mixed material in the water phase, so that the sodium fluoride and di Sodium fluoride is obtained by separating silicon oxide, but the separation of sodium fluoride and silicon dioxide is more complicated and costly, and it cannot solve the problem of difficult separation of the mixed material formed by sodium fluoride and silicon dioxide from the source

Method used

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Effect test

Embodiment 1

[0030] The sodium fluoride preparation method of the present embodiment is as follows:

[0031] 1) at 5m 3 Add 3m to the reactor 3 Water, add 240 kg of sodium fluorosilicate and stir until suspended, then add 190 kg of potassium chloride, stir and heat and keep the temperature at about 60°C, a displacement reaction occurs, and the sodium chloride solution and potassium fluorosilicate precipitate are obtained, separated by filtration Obtain about 280 kilograms of potassium fluorosilicate and sodium chloride solution;

[0032] 2) React the filtered potassium fluorosilicate with potassium carbonate solution (containing 352 kg of potassium carbonate) at a concentration of 8-16%, adjust the pH value to 8 for alkaline hydrolysis reaction, and generate potassium fluoride solution and silica precipitation, Filter to obtain potassium fluoride solution, precipitate, wash and dry to obtain about 76 kg of white carbon black;

[0033] 3) Divide the obtained potassium fluoride solution i...

Embodiment 2

[0037] The sodium fluoride preparation method of the present embodiment is as follows:

[0038] 1) at 5m 3 Add 3m to the reactor 3 Water, add 450 kg of sodium fluorosilicate and stir to suspend, then add 356 kg, stir and heat and keep the temperature at about 85°C, a displacement reaction occurs, and sodium chloride solution and potassium fluorosilicate precipitate are obtained, separated by filtration to obtain 526 kg Potassium fluorosilicate and sodium chloride solution;

[0039] 2) React the filtered potassium fluorosilicate with a potassium carbonate solution (containing 660 kg of potassium carbonate) at a concentration of 8-10%, adjust the pH value to 11 for alkaline hydrolysis reaction, and generate potassium fluoride solution and silica precipitation, Filter to obtain potassium fluoride solution, precipitate, wash and dry to obtain about 143 kg of white carbon black;

[0040] 3) Divide the obtained potassium fluoride solution into three parts, and perform the followi...

Embodiment 3

[0044] The sodium fluoride preparation method of the present embodiment is as follows:

[0045] 1) at 5m 3 Add 240kg of fluosilicic acid (100%) into the reaction kettle, and then add potassium carbonate solution to keep the temperature at about 60°C for neutralization reaction;

[0046] 2) Adjust the pH to 9, continue to add potassium carbonate solution to undergo alkaline hydrolysis reaction, obtain potassium fluoride and silicon dioxide precipitation, filter to obtain potassium fluoride solution, precipitate and dry to obtain 100 kg of white carbon black;

[0047] In steps 1) and 2), the total amount of potassium carbonate added is three times the molar weight of fluosilicic acid (690 kg in total),

[0048] 3) Add 530 kg of sodium carbonate to the potassium fluoride solution obtained in step 2) to obtain potassium carbonate solution and sodium fluoride precipitation, filter to obtain potassium carbonate solution (containing 690 kg of potassium carbonate), precipitate and dr...

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Abstract

The invention discloses a preparation method of sodium fluoride. Sodium fluosilicate or fluosilicic acid is taken as a raw material, and potassium chloride or potassium carbonate is taken as an intermediate reaction medium to react with sodium carbonate to prepare the sodium fluoride, and simultaneously, the potassium chloride or the potassium carbonate is recycled. The preparation method of the sodium fluoride of the invention is used, so that the generation of the sodium fluoride and the generation of the silicon dioxide are respectively in different reactions to radically solve the problemof difficult separation of the sodium fluoride and the silicon dioxide, thereby lowering the production cost of the sodium fluoride.

Description

technical field [0001] The invention relates to a method for preparing sodium fluoride, belonging to the technical field of chemical synthesis. Background technique [0002] Sodium fluoride is an important fluoride salt and a raw material for the manufacture of other fluorides. Sodium fluoride has a wide range of uses: it can be used as agricultural pesticides, fungicides, wood preservatives, drinking water treatment agents, fluxes and opacifiers for ceramic glass and enamel; it can also be used for cleaning steel or other metals; It can be used in the manufacture of ceramic pigments and boiling steel; it can also be used in the treatment of raw hides and skins in the leather industry; in addition, sodium fluoride can also be used in the enamel pharmaceutical industry, paper production and building materials. CN101717097A discloses a preparation method of sodium fluoride, which uses sodium fluorosilicate and soda ash to react in the water phase, and the resulting silicon di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02
Inventor 李云峰侯智民刘海霞罗成果陈以春高月杨水艳
Owner BAIYIN ZHONGTIAN CHEM
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