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A kind of preparation method of ultrapure magnesium oxide powder

A magnesium oxide powder, sodium hydroxide technology, applied in the direction of magnesium oxide, magnesium hydroxide, etc., can solve the problems of low economic and technical competitiveness

Active Publication Date: 2016-04-27
GANSU KETE OPTICAL TECHNIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing high-purity MgO preparation methods include vacuum volatilization method, solvent evaporation method, inert gas evaporation method, liquid phase precipitation method, sol-gel method, alkoxide decomposition method and vapor phase deposition method, etc., and the product purity is usually 98%. -- Between 99.9%, although the organic magnesium salt decomposition method can obtain ultra-pure magnesium oxide, but the economic and technical competitiveness is not strong

Method used

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  • A kind of preparation method of ultrapure magnesium oxide powder
  • A kind of preparation method of ultrapure magnesium oxide powder
  • A kind of preparation method of ultrapure magnesium oxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add magnesium sulfate heptahydrate into pure water with a conductivity of 1.0 μs / cm to completely dissolve, and prepare a 1.5mol / L magnesium sulfate solution, filter to remove mechanical impurities and insoluble substances; add 0.0000675mol / L oxalic acid and keep stirring until complete After the reaction produces calcium oxalate precipitate, let it stand and separate until the upper layer becomes a clear liquid, then filter; add 0.00006mol / L hydrogen peroxide dropwise while stirring continuously, and finish adding dropwise within 0.5h, then continue to react for 1h, and stir fully at the same time And acidify, control pH = 4; add 2mol / L sodium hydroxide and keep stirring, after complete reaction, let it stand for 24 hours, extract the supernatant, add it to the polytetrafluoroethylene reactor, keep stirring and heat up After reaching 68°C, add 3.0 mol / L ammonia water dropwise and keep stirring, and the dropwise addition is completed within 4 hours to obtain a magnesium ...

Embodiment 2

[0026] Add magnesium sulfate heptahydrate into pure water with a conductivity of 1.0μs / cm to dissolve completely, and prepare a 2.0mol / L magnesium sulfate solution, filter to remove mechanical impurities and insoluble substances; add 0.0009mol / L oxalic acid and keep stirring until completely After the reaction produces calcium oxalate precipitate, let it stand and separate until the upper layer becomes clear liquid, then filter; add 0.00008mol / L hydrogen peroxide dropwise under constant stirring, finish adding dropwise within 0.8h, then continue to react for 1.5h, and fully Stir and acidify, control pH = 4; add 2.5mol / L sodium hydroxide and keep stirring, let stand for 48 hours after complete reaction, extract the supernatant, add to the polytetrafluoroethylene reactor, keep stirring and After heating up to 70°C, add 4.0 mol / L ammonia water dropwise and keep stirring, and the dropwise addition is completed within 4 hours to obtain a magnesium hydroxide suspension; after the pro...

Embodiment 3

[0028] Add magnesium sulfate heptahydrate into pure water with a conductivity of 1.0 μs / cm to dissolve completely, and prepare a 2.5mol / L magnesium sulfate solution, filter to remove mechanical impurities and insoluble substances; add 0.0001125mol / L oxalic acid and keep stirring until completely After the reaction produces calcium oxalate precipitate, let it stand and separate until the upper layer becomes clear liquid, then filter; add 0.0001 mol / L hydrogen peroxide dropwise under constant stirring, and finish adding dropwise within 1 hour, then continue to react for 2 hours, at the same time fully stir and Acidification, control pH = 4; add 3mol / L sodium hydroxide and keep stirring, after complete reaction, let it stand for 36 hours, extract the supernatant, add it to the polytetrafluoroethylene reactor, keep stirring and heat up to After 72°C, add 5.0 mol / L ammonia water dropwise and keep stirring, and the dropwise addition is completed within 4 hours to obtain a magnesium h...

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Abstract

The invention discloses a preparation method of ultrapure magnesium oxide powder. It includes the following steps: A, adding magnesium sulfate heptahydrate into pure water to dissolve completely, preparing a magnesium sulfate solution, filtering to remove mechanical impurities and insoluble substances; B, adding oxalic acid while stirring continuously, and pumping Filter to remove impurity calcium; C, add hydrogen peroxide dropwise to the solution after decalcification while constantly stirring, D, add sodium hydroxide aqueous solution while constantly stirring, after the complete reaction and leave to stand for stratification, extract the supernatant, Under normal pressure, adopt multi-stage precipitation and multi-stage filtration methods to remove impurities; E. Put the filtered clear liquid into a polytetrafluoroethylene reactor, add ammonia water dropwise and keep stirring to obtain pure magnesium hydroxide suspension ; After centrifuging the suspension product, washing and filtering, drying, and calcining for at least 5 hours to obtain 99.999% ultra-pure magnesium oxide powder.

Description

technical field [0001] The invention belongs to the category of inorganic materials in the category of new materials, and specifically relates to a preparation method of ultrapure magnesium oxide powder. Background technique [0002] In China, high-purity magnesium oxide generally refers to W （MgO） ≥98% (weight percent) products, so most of them are used in silicon steel sheet coating, high-temperature insulating materials, advanced ceramics, etc. MgO protective layer plating, which is a key part of plasma display PDP devices, is a bottleneck in the plasma display production line. High-purity magnesium oxide (MgO) is widely used in many fields such as electronic components and advanced ceramic materials, especially in the new generation of plasma flat panel display (PDP), its performance directly affects the working characteristics and life of PDP. At present, the purity of MgO mass-produced in China is usually below 99.9%, and the content of impurities such as iron, silic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/08
CPCC01F5/08C01F5/22C01P2006/80
Inventor 杨松涛张煊铭李洁徐玉江
Owner GANSU KETE OPTICAL TECHNIC MATERIAL