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Preparation technology 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: 2017-11-17
QINGHAI SALT LAKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Preparation technology of magnesium fluoride

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Embodiment 1

[0040] Embodiment 1: The present embodiment provides a preparation process of magnesium fluoride, comprising the following 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 a...

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, which comprises the following steps: step S1: using the magnesium hydroxide filter cake formed in the process of extracting lithium from salt lake brine as a raw material, removing impurities from it to extract the magnesium hydroxide material, The mass fraction of Cl in the magnesium hydroxide material is 0.001% or less; Step S2: the magnesium hydroxide material is mixed with hydrofluoric acid, and neutralization reaction occurs to form magnesium fluoride; Step S3: the magnesium fluoride crystallization body that forms Separating the washing process and drying process to obtain magnesium fluoride crystals, the present invention obtains high-quality magnesium fluoride crystals, which are suitable for optical lens coating, use in ceramics and electronics industries, and use salt lake brine to extract hydrogen from waste in the production process of lithium Magnesium oxide filter cake is used as a raw material, which not only solves the problem of burying the waste magnesium hydroxide filter cake in the process of extracting lithium from brine, but also effectively saves the preparation cost of magnesium fluoride crystals. The process is simple, the energy consumption is low, and it is in line with the green cycle. Economic concept.

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 the 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 , the relative molecular mass is 62.3. Colorless crystal or white powder, rutile crystal lattice, slightly purple fluorescence. Very slightly soluble in water (18℃, 87mg / L), slightly soluble in dilute acid (especially nitric acid). Relative density 3.18. Melting point 1248 ℃. Boiling point 2260 ℃. 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 spectrum. Application: Optical lens coating. The optical equipment is coated with a layer of magnesium fluoride film, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/28
CPCC01F5/28
Inventor 刘林俊刘利德包庆山俞莅军
Owner QINGHAI SALT LAKE IND