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Preparation process of magnesium fluoride

A preparation process, magnesium fluoride technology, applied in the direction of magnesium fluoride, magnesium halide, etc., can solve the problems of production enterprises and environmental losses, the increase of magnesium hydroxide filter cake landfill costs, waste of resources, etc., to achieve low energy consumption, saving The effect of simple preparation cost and preparation process

Inactive Publication Date: 2018-07-17
何朋飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The purpose of the present invention is to provide a preparation process of magnesium fluoride, which has the advantage of saving resources, and solves the problem that the discarding of magnesium hydroxide filter cake not only increases the cost of burying but also causes waste of resources in the process of extracting lithium from salt lake brine, A problem that will cause huge losses to production enterprises and the environment

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0040]Embodiment one: the present embodiment provides a kind of preparation technology of magnesium fluoride, comprises the steps:

[0041] Step S1: Using the magnesium hydroxide filter cake as a raw material, the magnesium hydroxide filter cake is subjected to impurity removal treatment to extract the magnesium hydroxide material in the magnesium hydroxide filter cake, specifically, in order to improve the purity of the final product of this example , Cl in the magnesium hydroxide material formed by the above impurity removal treatment - The mass fraction of the content is required to be below 0.001%.

[0042] In the magnesium hydroxide filter cake, the main substance is magnesium hydroxide, and also contains magnesium chloride impurities formed by part of sodium chloride and a small amount of unreacted magnesium ions. Therefore, in this embodiment, the magnesium hydroxide filter cake is firstly removed. deal with. The impurity removal treatment can adopt multi-step washing...

Embodiment 2

[0055] Embodiment two: the present embodiment provides a kind of preparation technology of magnesium fluoride, comprises the steps:

[0056] Step S1: Using the magnesium hydroxide filter cake as a raw material, the magnesium hydroxide filter cake is subjected to impurity removal treatment to extract the magnesium hydroxide material in the magnesium hydroxide filter cake, specifically, in order to improve the purity of the final product of this example , Cl in the magnesium hydroxide material formed by the above impurity removal treatment - The mass fraction of the content is required to be below 0.001%.

[0057] In the magnesium hydroxide filter cake, the main substance is magnesium hydroxide, and also contains magnesium chloride impurities formed by part of sodium chloride and a small amount of unreacted magnesium ions. Therefore, in this embodiment, the magnesium hydroxide filter cake is firstly removed. deal with. The impurity removal treatment can adopt multi-step washin...

Embodiment 3

[0070] Embodiment three: the present embodiment provides a kind of preparation technology of magnesium fluoride, comprises the following steps:

[0071] Step S1: Using the magnesium hydroxide filter cake as a raw material, the magnesium hydroxide filter cake is subjected to impurity removal treatment to extract the magnesium hydroxide material in the magnesium hydroxide filter cake, specifically, in order to improve the purity of the final product of this example , Cl in the magnesium hydroxide material formed by the above impurity removal treatment - The mass fraction of the content is required to be below 0.001%.

[0072] In the magnesium hydroxide filter cake, the main substance is magnesium hydroxide, and also contains magnesium chloride impurities formed by part of sodium chloride and a small amount of unreacted magnesium ions. Therefore, in this embodiment, the magnesium hydroxide filter cake is firstly removed. deal with. The impurity removal treatment can adopt multi...

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Abstract

The invention discloses a preparation process of magnesium fluoride. The preparation process comprises the following steps: step 1, using a magnesium hydroxide filter cake formed in a salt lake brinelithium extraction process as a raw material, and removing impurities of the magnesium hydroxide filter cake to extract a magnesium hydroxide material, wherein the mass fraction of Cl<-> in the magnesium hydroxide material is 0.001% or less; step 2, mixing the magnesium hydroxide material and hydrofluoric acid, and performing a neutralizing reaction to form magnesium fluoride; and step 3, performing separation on the formed magnesium fluoride crystal initial body, performing washing, and performing drying to obtain the magnesium fluoride crystal. The magnesium fluoride crystal with excellent quality obtained by the process provided by the invention is suitable for film coating of optical lenses and used in ceramic and electronic industry, and the waste magnesium hydroxide filter cake in the salt lake brine lithium extraction process is adopted as the raw material, so that the problem of burying of the waste magnesium hydroxide filter cake in the salt lake brine lithium extraction process is solved, and preparation costs of the magnesium fluoride crystal are effectively saved; and the preparation process has a simple process and low energy consumption, and is consistent with a concept of green circular economy.

Description

technical field [0001] The invention relates to the technical field of magnesium fluoride preparation, in particular to a preparation process for producing magnesium fluoride crystals by using waste magnesium hydroxide filter cake produced in the process of extracting lithium from salt lake brine. Background technique [0002] Magnesium fluoride, molecular formula MgF 2 , relative molecular mass 62.3. Colorless crystal or white powder, rutile crystal lattice, slightly purple fluorescence. Very slightly soluble in water (18°C, 87mg / L), slightly soluble in dilute acids (especially nitric acid). The relative density is 3.18. The melting point is 1248°C. The boiling point is 2260°C. Toxic and irritating. It shows weak purple fluorescence when heated under electric light, and its crystal has good polarization effect, especially suitable for ultraviolet and infrared spectra. Uses: Optical lens coating. The optical equipment is coated with a layer of magnesium fluoride film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/28
CPCC01F5/28
Inventor 何朋飞
Owner 何朋飞