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Preparation method of sodium fluoride

A technology of sodium fluoride and silicon fluoride, applied in the direction of alkali metal fluoride, alkali metal silicate, silicate, etc., can solve the problems of high cost, high risk, large loss, etc., and meet the low requirements of equipment , reduce production costs, and reduce emissions

Inactive Publication Date: 2015-04-08
SONGXIAN ZHONGKE INCUBATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires high temperature and high pressure, high loss and high risk
At the same time, sodium fluorosilicate with higher purity is used as raw material, and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of sodium fluoride includes the following steps:

[0020] Decomposition of albite: first preheat albite and fluorite at 100°C for about 30 minutes, then add 98% sulfuric acid to react the three at 100°C and autogenous pressure for about 5 hours to obtain calcium sulfate and sodium sulfate With the solid residue of aluminum sulfate and the gas product containing silicon fluoride, the mass ratio of albite, fluorite, and 98% sulfuric acid is 1:1.55:3.28. The reaction principle is:

[0021] CaF 2 + H 2 SO 4 = 2HF + CaSO 4

[0022] 2NaAlSi 3 O 8 + 24HF + 4H 2 SO 4 = Na 2 SO 4 + Al 2 (SO 4 ) 3 + 6SiF 4 ↑ + 16H 2 O

[0023] Preparation of fluorosilicic acid solution: the above-mentioned gas product containing silicon fluoride is introduced into the dust removal filter to remove dust; the gas after dust removal and filtration is passed into the primary absorption tower and is absorbed and hydrolyzed by the absorption liquid in the primary absorption tower Th...

Embodiment 2

[0029] A preparation method of sodium fluoride includes the following steps:

[0030] Decomposition of albite: The specific implementation of this step in this example is basically the same as the specific implementation of decomposition of albite in Example 1, except that the preheating temperature is 150°C and the preheating time is 20 minutes; the reaction temperature is 150°C, and the reaction time is 3.5 hours; wherein the mass ratio of albite, fluorite, and 98% sulfuric acid is 1:2:4;

[0031] Preparation of fluorosilicic acid solution: The specific implementation of this step in this example is the same as the implementation of preparing the fluorosilicic acid solution in Example 1;

[0032] Preparation of a slurry containing sodium fluoride and silica: The specific implementation of this step in this example is basically the same as the specific implementation of preparing a slurry containing sodium fluoride and silica in Example 1, with the difference The point is: the temp...

Embodiment 3

[0035] A preparation method of sodium fluoride includes the following steps:

[0036] Decomposition of albite: The specific implementation of this step in this example is basically the same as the specific implementation of decomposition of albite in Example 1, except that the preheating temperature is 200°C and the preheating time is 15 minutes; the reaction temperature is 200°C, the reaction time is 2 hours, and the mass ratio of albite, fluorite, and 98% sulfuric acid is 1:2.5:4.6;

[0037] Preparation of fluorosilicic acid solution: The specific implementation of this step in this example is the same as the implementation of preparing the fluorosilicic acid solution in Example 1;

[0038] Preparation of a slurry containing sodium fluoride and silica: The specific implementation of this step in this example is basically the same as the specific implementation of preparing a slurry containing sodium fluoride and silica in Example 1, with the difference The point is: the temperatur...

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PUM

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Abstract

The invention provides a preparation method of sodium fluoride. The preparation method utilizes a silicon fluoride-containing gas product produced by albite decomposition and sodium hydroxide as raw materials to product sodium fluoride. The preparation method comprises the following steps that the silicon fluoride-containing gas product is fed into an absorbing tower and is hydrolyzed to produce a fluosilicic acid solution, the fluosilicic acid solution is put into a reactor and reacts with added sodium hydroxide to produce sodium fluoride, sodium hydroxide is added into the reactor until the solution pH value in the reactor is greater than or equal to 10, and sodium fluoride crystals are precipitated, then are filtered and then are dried to form sodium fluoride finished products. The preparation method has the advantages of simple processes, low energy consumption, small environmental pollution and good application prospect.

Description

Technical field [0001] The invention relates to a method for preparing sodium fluoride, in particular to a method for preparing sodium fluoride by using albite. 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 is mainly used for inlay steel of mechanical blades and planers to enhance welding strength; secondly, it is used as wood preservatives, brewing fungicides, agricultural pesticides, medical preservatives, welding fluxes, and drinking water Fluorine treatment agent; also used in the production of other fluoride and casein gum, sodium fluoride toothpaste, as well as adhesives, papermaking and metallurgical industries; in the production of elemental fluorine, used to remove trace hydrogen fluoride. In addition, it is also used in enamel and pharmaceutical industries. [0003] The traditional sodium fluoride production method is: 99% sodium fluorosi...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01B33/32
Inventor 付建国胡安慧梁国栋
Owner SONGXIAN ZHONGKE INCUBATOR
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