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A kind of method that prepares cryolite with fluorite

A cryolite and fluorite technology is applied in the field of preparing cryolite with fluorite as a raw material, which can solve the problems such as complicated processes and toxic gases, and achieve the effects of improving purity, safety, environmental protection, and process safety.

Inactive Publication Date: 2018-09-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method disclosed by Zhang Dadian in the document "A New Method for Preparing Cryolite from Low-grade Fluorite Ore" has a cumbersome process and generates a large amount of toxic gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Ⅱ. Preparation process of cryolite

[0029] 1) Slowly add 7-10mol / L sodium hydroxide solution to the filtrate, control the dropping rate of sodium hydroxide to 0.05-0.07ml / s, and the reaction temperature to 80°C-100°C, reduce the acidity of the filtrate until the solution Adjust the pH value to 2.0-3.0;

[0030] 2) Aging the solution in step 4) for 1 to 2 hours, and then filtering again, the filter residue is cryolite.

Embodiment 1

[0033] Ⅰ. Fluoride extraction process

[0034] Crush and grind 1Kg fluorite mineral, pass through a 325-mesh sieve to obtain fluorite powder; first detect the content of calcium fluoride in fluorite powder, and then use the molar ratio of calcium fluoride to aluminum chloride of fluorite powder as 5:2 Mix fluorite powder and aluminum chloride to obtain a mixture; add hydrochloric acid to the mixture under stirring according to the mass ratio of hydrochloric acid and fluorite powder at a ratio of 2:1, the concentration of hydrochloric acid is 2mol / L, and heat up to 80°C for reaction After 2 hours, the filtrate was obtained after filtration, and the filtrate was the acidic solution of the fluoroaluminum complex, which was used in the subsequent cryolite preparation process.

[0035] Ⅱ. Preparation process of cryolite

[0036] After the above reaction is completed, slowly add 7mol / L sodium hydroxide solution to the filtrate to adjust the pH value of the filtrate and introduce a ...

Embodiment 2

[0038] Ⅰ. Fluoride extraction process

[0039] Crush and grind 1Kg of fluorite mineral, pass through a 300-mesh sieve to obtain fluorite powder; first detect the content of calcium fluoride in the fluorite powder, and then use the molar ratio of calcium fluoride to aluminum chloride in the fluorite powder as 3:1 Mix fluorite powder and aluminum chloride to obtain a mixture; add hydrochloric acid to the mixture under stirring according to the mass ratio of hydrochloric acid and fluorite powder at a ratio of 5:1, the concentration of hydrochloric acid is 5mol / L, and heat up to 100°C for reaction After 8 hours, the filtrate was obtained after filtration, and the filtrate was the acidic solution of the fluoroaluminum complex, which was used in the subsequent cryolite preparation process.

[0040] Ⅱ. Preparation process of cryolite

[0041] After the above reaction is completed, slowly add 10mol / L sodium hydroxide solution to the filtrate to adjust the pH value of the filtrate and...

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Abstract

The invention discloses a method for preparing cryolite from fluorite and belongs to the technical field of the cryolite preparation method. The method comprises a fluorine extracting process and a cryolite preparation process. The method specifically comprises the following steps: 1) crushing, milling and screening fluorite ore, thereby obtaining fluorite powder; 2) mixing the fluorite powder with aluminum chloride at a ratio, thereby obtaining a mixture; 3) adding hydrochloric acid slurry into the mixture while stirring and then reacting while increasing temperature and filtering, thereby obtaining a filtrate; 4) slowly adding a sodium hydroxide solution into the filtrate, thereby reducing the acidity of the filtrate; and 5) aging the solution obtained in the step 4), filtering and then obtaining the filter residue, namely, cryolite. The preparation method disclosed by the invention is safe and environment-friendly in process and is short in process.

Description

technical field [0001] The invention relates to the field of a preparation method of cryolite, in particular to a method for preparing cryolite by using fluorite as a raw material. Background technique [0002] Fluorspar, also known as fluorspar, is an important chemical mineral in my country and the foundation of the entire fluorine chemical industry. Subsequent fluorine chemical products are all deep-processed on the basis of it. Fluorite is widely used in metallurgy, aluminum smelting, ceramics, cement, glass, fluorine chemical industry and other industries. It affects national security, national economy and social development. Our country is rich in fluorite resources, forming a natural advantage for the development of fluorine chemical industry. However, my country's fluorine chemical production has not entered a mature stage. At present, the main methods for the development and utilization of fluorite resources in my country are: mixing fluorite powder with hydrofluo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/54
CPCC01F7/54C01P2006/80
Inventor 祝宏帅孙金峰赵隽孟永强
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY