A kind of low-density aluminum fluoride and its production process

A production process and technology of aluminum fluoride, applied in the field of low-density aluminum fluoride and its production process, can solve the problems of high density and small specific surface area of ​​aluminum fluoride, achieve the guarantee of silicon content, improve the specific surface area and density, and enhance the strength of aluminum fluoride. The effect of structure orientation

Active Publication Date: 2019-02-01
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production of aluminum fluoride by the direct method of fluosilicic acid has achieved great success abroad, but the aluminum fluoride currently produced has a high density and a small specific surface area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low-density aluminum fluoride is prepared by the following steps:

[0022] S1. In the reaction tank equipped with fluosilicic acid, add template agent and mix evenly, heat to 45°C, add sodium bicarbonate in batches, when the amount of sodium bicarbonate added is one-third of the total, add sulfuric acid, heat up to 90°C, add sodium bicarbonate, react for 1 hour, filter, wash and take the filtrate to obtain reaction solution 1;

[0023] S2. Heat the reaction solution 1 to 60°C, add aluminum chloride hexahydrate under stirring condition, react for 1 hour, add template agent, heat up to 95°C, concentrate to obtain crystallization and obtain wet material;

[0024] S3. Drying the wet material at 80°C and then performing stage-by-stage temperature-controlled calcining to obtain low-density aluminum fluoride, the calcining temperature being 300-600°C.

Embodiment 2

[0026] A low-density aluminum fluoride is prepared by the following steps:

[0027] S1. In the reaction tank equipped with fluosilicic acid, add template agent and mix evenly, heat to 50°C, add sodium bicarbonate in batches, when the amount of sodium bicarbonate added is one-third of the total, add sulfuric acid, and heat up to 80°C, add sodium bicarbonate, react for 1.5h, filter, wash and take the filtrate to obtain reaction solution 1, wherein the molar ratio of fluosilicic acid to sodium bicarbonate is 1:6, the weight of template agent and fluosilicic acid The ratio is 2:100, the concentration of sulfuric acid is 98wt%, and the molar ratio of sulfuric acid to sodium bicarbonate is 0.5:100;

[0028] S2. Heat the reaction solution 1 to 65°C, add aluminum chloride hexahydrate under stirring conditions, react for 0.5h, add template agent, heat up to 90°C, concentrate to obtain crystallization and obtain wet material, wherein aluminum chloride hexahydrate and The molar ratio of...

Embodiment 3

[0031] A low-density aluminum fluoride is prepared by the following steps:

[0032] S1. In the reaction tank equipped with fluorosilicic acid, add polyethylene glycol and mix evenly, heat to 48°C, add sodium bicarbonate in batches, and add sulfuric acid when the amount of sodium bicarbonate is one-third of the total , the temperature was raised to 85°C, and sodium bicarbonate was added, reacted for 1.5h, filtered, washed and the filtrate was obtained to obtain reaction liquid 1, wherein the molar ratio of fluosilicic acid to sodium bicarbonate was 1:6.5, polyethylene glycol and fluorine The weight ratio of silicic acid is 3:100, the concentration of sulfuric acid is 98wt%, and the molar ratio of sulfuric acid to sodium bicarbonate is 0.6:100;

[0033] S2. Heat the reaction solution 1 to 63°C, add aluminum chloride hexahydrate under stirring condition, react for 1h, add polyethylene glycol, heat up to 92°C, concentrate to obtain crystallization and obtain wet material, wherein ...

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Abstract

The invention discloses low-density aluminum fluoride and a production process thereof. The production process comprises the following steps: S1, adding a template agent into a reaction tank filled with fluosilicic acid, mixing uniformly, heating to 45 to 50 DEG C, adding sodium bicarbonate in batches, adding sulfuric acid when the adding amount of sodium bicarbonate is one third of the total amount, heating to 80 to 90 DEG C, adding the rest of sodium bicarbonate, reacting for 1 to 1.5 hours, filtering, washing and taking filtrate to obtain reaction liquid 1; S2, heating the reaction liquid 1 to 60 to 65 DEG C, adding aluminium chloride hexahydrate under the stirring condition, reacting for 0.5 to 1 hour, adding a template agent, heating to 90 to 95 DEG C, concentrating and crystallizing to obtain wet materials; and S3, drying the wet materials at 70 to 80 DEG C, and performing stepwise temperature control calcination to obtain low-density aluminum fluoride at the calcination temperature being 300 to 600 DEG C. The fluosilicic acid, ammonium bicarbonate and aluminium chloride hexahydrate serve as raw materials, and the template agent is added to cooperate with stepwise temperature control calcinations, so the specific surface area of aluminum fluoride is increased, the density of products is reduced and the reaction activity is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum fluoride preparation, in particular to a low-density aluminum fluoride and a production process thereof. Background technique [0002] As one of the important inorganic fluoride products, aluminum fluoride is mainly used in aluminum smelting industry and fine chemical industry. The production methods of aluminum fluoride are roughly divided into two categories. One is that the metallurgical industry has been using sulfuric acid to decompose fluorite to generate hydrofluoric acid, and then react with aluminum hydroxide to produce aluminum fluoride; the other is the acid method used in the phosphate fertilizer industry. Process production of phosphate fertilizers such as phosphoric acid ammonium, heavy superphosphate, calcium superphosphate and other by-products of fluosilicic acid, react with aluminum hydroxide to obtain aluminum fluoride wet material, and then dry, burn, and cool to obtain alumin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/50
CPCC01F7/50C01P2006/12C01P2006/16
Inventor 曹玉宽
Owner ANHUI JINYANG FLUORINE CHEM
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