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Purification method of magnesium hydroxide and method for recovery of magnesium hydroxide from magnesium air batteries and preparation of magnesium oxide therefrom

A magnesium hydroxide, air battery technology, applied in magnesium hydroxide, magnesium oxide, chemical instruments and methods, etc., can solve the problems of limited increase of calcium-silicon ratio and inability to ensure

Active Publication Date: 2019-11-26
北京镁德百世科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not only that, even if concentrated alkali is used for washing, the increase in calcium-silicon ratio is relatively limited, and it cannot be guaranteed to reach more than 2

Method used

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  • Purification method of magnesium hydroxide and method for recovery of magnesium hydroxide from magnesium air batteries and preparation of magnesium oxide therefrom
  • Purification method of magnesium hydroxide and method for recovery of magnesium hydroxide from magnesium air batteries and preparation of magnesium oxide therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Conduct discharge experiments with self-made magnesium-air batteries, and convert electrodes made of pure magnesium into magnesium hydroxide;

[0042] Magnesium-air battery setup:

[0043] Effective area of ​​the air electrode (that is, the area that is effectively facing the magnesium electrode): 20m*25cm; Catalyst: 20% platinum carbon, purchased from Johnson Matthey; Catalyst loading: 0.1mg / cm 2 ; Magnesium electrode size: 20cm*26cm*0.5cm; Magnesium purity: ≥99.90%, the electrolyte is NaCl aqueous solution, the concentration is 10wt.%;

[0044] The above-mentioned magnesium-air battery was discharged with a constant current of 3A until the magnesium electrode was consumed to the point that it could not continue to discharge. Take out all the white solid residue, wash it with deionized water three times, 300mL each time, dry it at 80°C to a white powder, and weigh 900g for use.

Embodiment 2

[0046] Weigh out 100g from the white powder prepared in Example 1, use 50mL concentration of 1wt.% edetate disodium magnesium aqueous solution to rinse, then rinse three times with deionized water, each time 100mL, rinse The washed white powder is placed in a muffle furnace and calcined at 1000°C for 6 hours to obtain magnesium oxide.

Embodiment 3

[0048] The method of Example 2 was adopted, except that the aqueous solution of magnesium disodium edetate was replaced by an aqueous solution of magnesium citrate with a concentration of 1 wt.%.

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Abstract

Belonging to the technical field of inorganic chemistry and chemical industry, the invention provides a purification method of magnesium hydroxide and a method for recovery of magnesium hydroxide frommagnesium air batteries and preparation of magnesium oxide therefrom. The purification method of magnesium hydroxide and the method for recovery of magnesium hydroxide from magnesium air batteries adopts a cleaning agent containing anions, which have complexing ability, are conducive to dissolving calcium, iron, aluminum and other impurities, and at the same time can combine silicon impurities (e.g. silicon impurities in the form of silicon dioxide) to disperse silicon impurities in a cleaning agent solution even in the case of insolubilization, thus lowering the silicon content, and then thefinally obtained magnesium oxide can have a silicon-calcium ratio higher than 2. In addition, the method for recovery of magnesium hydroxide from magnesium air batteries provided by the invention also realizes recycling of magnesium hydroxide, and acquires the ultra-high purity magnesium oxide with a magnesium oxide purity higher than 99.8wt.%.

Description

technical field [0001] The present invention relates to the technical field of inorganic chemistry and chemical industry, and in particular to a method for purifying magnesium hydroxide, a method for recovering magnesium hydroxide from a magnesium-air battery, and purifying magnesium hydroxide recovered from a magnesium-air battery to prepare an oxide Magnesium way. Background technique [0002] Pure magnesium hydroxide is an important chemical raw material, and one of its important uses is to prepare ultra-high-purity magnesium oxide, that is, magnesium oxide with a purity of more than 99.50 wt.%. Ultra-high-purity magnesia is an excellent refractory material for the iron and steel industry. At present, the industrial preparation method of ultra-high-purity magnesium oxide is mainly to extract magnesium salt from seawater or bittern, and then make magnesium oxide through a series of post-processing. However, the traditional method has the problem of low purity of magnesia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C01F5/08
CPCC01F5/08C01F5/145C01P2006/80
Inventor 梁靓王翊钧陈泽森董明明张钰周阳
Owner 北京镁德百世科技有限公司
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