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Preparation method of aluminium fluoride

A technology of aluminum fluoride and aluminum hydroxide, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of complex process, high price of raw materials for production process, high production cost, and achieve simple principle, easy process control and low cost. Effect

Inactive Publication Date: 2014-09-24
ANHUI JINYANG FLUORINE CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The raw material price of the above-mentioned production process is high, the production cost is high, and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] A preparation method for aluminum fluoride, comprising the steps of:

[0017] (1) Measure the fluosilicic acid solution with a concentration of 8%-14% from the phosphoric acid plant, put it into the aluminum fluoride reaction tank, and heat the fluosilicic acid solution to 70-80°C;

[0018] (2) Add aluminum hydroxide with a theoretical amount of 95% to the reaction tank, keep the solution acidic, add aluminum hydroxide uniformly and continuously within 15-30 minutes and stir, the stirring speed is 200r / min, and the stirring time is 20- 30min, with the help of reaction heat, the temperature rises to 90-95°C;

[0019] (3) Keep the reaction at 95°C for 0.5-1h, and filter after the reaction is completed;

[0020] (4) Wash the filter cake silica gel with hot water at 60-70°C.

Embodiment 1

[0022] A preparation method for aluminum fluoride, comprising the steps of:

[0023] (1) Measure the fluosilicic acid solution with a concentration of 8% from the phosphoric acid plant, put it into the aluminum fluoride reaction tank, and heat the fluosilicic acid solution to 70°C;

[0024] (2) Add aluminum hydroxide with a theoretical amount of 95% to the reaction tank, keep the solution acidic, add aluminum hydroxide uniformly and continuously within 15 minutes and stir, the stirring speed is 200r / min, and the stirring time is 20min. heat, the temperature rises to 90°C;

[0025] (3) Keep the reaction at 95°C for 0.5h, and filter after the reaction is completed;

[0026] (4) Wash the filter cake silica gel with hot water at 60°C.

Embodiment 2

[0028] A preparation method for aluminum fluoride, comprising the steps of:

[0029] (1) Measure the fluosilicic acid solution with a concentration of 14% from the phosphoric acid plant, put it into the aluminum fluoride reaction tank, and heat the fluosilicic acid solution to 80°C;

[0030] (2) Add aluminum hydroxide with a theoretical amount of 95% to the reaction tank, keep the solution acidic, add aluminum hydroxide uniformly and continuously within 30 minutes and stir, the stirring speed is 200r / min, and the stirring time is 30min. heat, the temperature rises to 95°C;

[0031] (3) Keep the reaction at 95°C for 1 hour, and filter after the reaction is completed;

[0032] (4) Wash the filter cake silica gel with hot water at 70°C.

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Abstract

The invention relates to a preparation method of aluminium fluoride. The preparation method comprises the following steps: (1) putting a fluosilicic acid solution from a phosphoric acid device into an aluminium fluoride reaction tank after metering the solution and heating the fluosilicic acid solution to 70-80 DEG C; (2) adding aluminium hydroxide to the reaction tank, maintaining the acidity of the solution, uniformly and continuously adding the rest aluminium hydroxide within 15-30 minutes and stirring aluminium hydroxide and raising the temperature to 90-95 DEG C with the help of reaction heat; (3) maintaining reaction at 95 DEG C for 0.5-1 hour and carrying out filtration after reaction is completed; (4) washing filter cake silica gel with hot water at a temperature of 60-70 DEG C. The preparation method has the beneficial effects that the principle is simple; the flow is easy to operate; the process is easy to control; the obtained product has high yield, is low in cost and has higher market competitiveness.

Description

technical field [0001] The invention relates to a preparation method of aluminum fluoride. Background technique [0002] Aluminum fluoride is used as an additive in the production of electrolytic aluminum to lower the melting point of the electrolyte and increase the conductivity of the electrolyte. The traditional production processes include hydrofluoric acid-dry process and hydrofluoric acid-wet production process. The raw materials of hydrofluoric acid-dry process are hydrofluoric acid and aluminum hydroxide, and its production process includes pretreatment of aluminum hydroxide to remove crystal water, and then powdered aluminum hydroxide and hydrogen fluoride gas at 500-600 ° C Fully mixed at high temperature for reaction, aluminum trifluoride is generated at the bottom of the reactor, aluminum trifluoride is sent into the drum, and the finished product is obtained after cooling. Hydrofluoric acid is the raw material of the wet process, and aluminum oxide is generated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50
Inventor 陈喜
Owner ANHUI JINYANG FLUORINE CHEM
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