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Preparation method of aluminum fluoride

A technology of aluminum fluoride and silicon fluoride, which is applied in the field of preparing aluminum fluoride by using albite, can solve the problems of large investment in dry process equipment, high raw material price and high production cost, and achieves low raw material price and simple preparation method. , the effect of improving productivity

Inactive Publication Date: 2015-03-25
SONGXIAN ZHONGKE INCUBATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these production processes have problems such as high raw material prices, high production costs, large investment in dry process equipment, and complicated processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment provides a kind of preparation method of aluminum fluoride, comprises the following steps:

[0023] Decomposition of albite powder: first preheat albite powder 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, and obtain calcium sulfate, sulfuric acid The solid residue of sodium and aluminum sulfate and the gas product containing silicon fluoride, among them, the mass ratio of albite powder, fluorite, and 98% sulfuric acid is 1:1.55:3.28, and the reaction principle is:

[0024] CaF 2 + H 2 SO 4 = 2HF + CaSO 4 ,

[0025] 2NaAlSi 3 o 8 + 24HF + 4H 2 SO 4 = Na 2 SO 4 +Al 2 (SO 4 ) 3 + 6SiF 4 ↑ + 16H 2 O;

[0026] Gas absorption hydrolysis: filter the gas product containing silicon fluoride with a dust removal filter; pass the gas product after dust removal and filtration to the first and second absorption towers for hydrolysis, and contro...

Embodiment 2

[0034] The preparation method of the aluminum fluoride provided in this embodiment and embodiment 1 is basically the same, the difference is:

[0035] During the decomposition process of the albite powder, the preheating temperature of the albite is 150°C, the preheating time is 20 minutes, the decomposition reaction temperature is 150°C, and the decomposition reaction time is 3.5 hours, and the albite powder, The mass ratio of fluorite and 98% sulfuric acid is 1:2:4;

[0036] In the process of gas absorption and hydrolysis, the absorption liquid is a mixed solution of ammonia water with a concentration of 22% by mass and sodium nitrilotriacetate with a weight of 0.2% of silicon fluoride, and the hydrolysis temperature of silicon fluoride is about 85°C, and The pH value at the end of the hydrolysis reaction is about 8.5; the added amount of the ammonia water is 115% of the mass required according to the reaction theory, and the hydrolyzate is aged at 35°C for 2.5 hours;

[00...

Embodiment 3

[0041] The preparation method of the aluminum fluoride provided in this embodiment and embodiment 1 is basically the same, the difference is:

[0042] In the process of albite powder decomposition, the preheating temperature is 200°C, and the preheating time is 15 minutes; the reaction temperature is 200°C, and the reaction time is 2 hours;

[0043] In the process of gas absorption and hydrolysis, the absorption liquid is a mixture of ammonia water with a mass percent concentration of 28% and sodium nitrilotriacetate with a silicon fluoride weight of 0.3%, and the hydrolysis temperature of silicon fluoride is about 90°C, and The pH value at the end point of the hydrolysis reaction is about 9; the amount of ammonia water added is 130% of the mass required according to the reaction theory; the hydrolyzate is aged at 40°C for 2 hours;

[0044] In the process of pyrolysis, the decomposition temperature of the ammonium fluoride solution is 180°C;

[0045] In the process of leachin...

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Abstract

The invention provides a preparation method of aluminum fluoride. The preparation method comprises steps as follows: solid residues containing calcium sulfate, sodium sulfate and aluminum sulfate and a gas product containing silicon fluoride are generated through albite powder decomposition; the gas product containing silicon fluoride is subjected to ammonia absorption and hydrolysis to prepare an ammonium fluoride solution, and the ammonium fluoride solution is subjected to high-temperature decomposition to prepare an ammonium hydrogen fluoride solution; the solid residues are leached and extracted in a leaching tank to obtain an acidic leaching solution, the acidic leaching solution is subjected to adsorption and elution treatment by cation exchange resin columns to obtain an eluting solution which is neutralized by ammonium hydroxide to generate aluminum hydroxide slurry; and the aluminum hydroxide slurry is added to the ammonium hydrogen fluoride solution to react to prepare an aluminum fluoride solution, and the aluminum fluoride solution is crystalized and dried to prepare a finished product of aluminum fluoride. According to the method, the process is simple, the production cost is low, the environmental pollution is small, and the method is suitable for popularization and application.

Description

technical field [0001] The invention relates to a method for preparing aluminum fluoride, in particular to a method for preparing aluminum fluoride by using albite. Background technique [0002] Aluminum fluoride is colorless or white crystal, insoluble in water, acid and alkali. The chemical properties are relatively stable and can be hydrolyzed when heated. It is mainly used in aluminum smelting to lower the melting point and increase the conductivity of the electrolyte. Aluminum fluoride is used as a by-fermentation inhibitor in ethanol production. Aluminum fluoride can also be used as flux and glaze component of ceramic glaze and enamel glaze. Aluminum fluoride can also be used as a flux for smelting non-ferrous metals. Therefore, aluminum fluoride is a widely used chemical product, so it is very necessary to study the preparation of aluminum fluoride. [0003] The traditional processes for generating aluminum fluoride mainly include hydrogen fluoride dry process an...

Claims

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Application Information

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IPC IPC(8): C01F7/50
CPCC01F7/50
Inventor 李英春胡安慧付建国
Owner SONGXIAN ZHONGKE INCUBATOR