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Bischofite dehydration-electrolysis method for refining magnesian

A bischofite and anhydrous magnesium chloride technology, applied in the direction of magnesium chloride, magnesium halide, etc., can solve the problems of large amount of electrolytic furnace slag, decreased current efficiency, and electrolyte consumption, and achieve high conductivity, reduced impact, and reduced recycling costs Effect

Inactive Publication Date: 2006-02-22
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

Because the solubility of magnesium oxide in the electrolyte is extremely low, if the content of magnesium oxide is greater than 0.5%, it will have a great impact on the electrolysis process. The insoluble magnesium oxide exists in a floating state, which will cause the electrolyte to boil during the electrolysis process, and the current efficiency will drop seriously. The amount of slag is large, the electrolyte consumption is serious, and the energy consumption is high

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  • Bischofite dehydration-electrolysis method for refining magnesian

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preparation example Construction

[0028] (2) Preparation of electrolytic magnesium smelting electrolyte;

[0029] Its main components are still: NaCl-KCl-MgCl 2 -CaCl 2 , adding fluoride (such as MgF 2 , LiF, NaF, CaF 2 etc.) and containing rare earth chlorides (such as NdCl 3 、LaCl 3 etc.), effectively increasing the solubility of MgO in complex electrolyte systems. Wherein the weight percent scope of each component of electrolytic solution is:

[0030] NaCl: 20-40, KCl: 10-30, MgCl 2 : 7~15, CaCl 2 : 20-30, fluoride: 2~6, rare earth chloride: 3~5.

[0031] Wherein the fluoride is selected from MgF 2 , LiF, NaF, CaF 2 One or several mixtures.

[0032] Wherein the rare earth chloride is selected from NdCl 3 、LaCl 3 One or several mixtures.

[0033] Physical and chemical indicators of the new electrolyte: electrical conductivity: 2.2-2.87 ohm-1.cm-1, surface tension: 0.09-0.14N / m, density: 1.5-1.67g / cm3, primary crystal temperature: 550-652°C.

[0034] (3) Coupling reaction crystallization to pre...

Embodiment 1

[0050] In a 5-liter reactor, add 3,500 grams of magnesium chloride organic solution prepared at a rate of 3 liters / hour, containing 10% magnesium chloride, 11.7% water, 1.0% ammonium chloride, 45% methanol, and ethylene dichloride. Alcohol 32.7%; under the condition of normal temperature and stirring, the precipitant ammonia gas is introduced at a rate of 0.8m3 / h. After the feeding is completed, continue to stir and mature and recrystallize for 1 hour, filter the slurry-like feed liquid, and saturate it with ammonia Washed with a mixture of 100 grams of methanol and 20 grams of ethanol, the solid product was dried at 120°C for 1.2 hours with isolated air, and melted and deaminated at 760°C for 1.2 hours. Anhydrous magnesium chloride, the molten anhydrous magnesium chloride can be used for electrolysis. The content is less than 0.3%, the magnesium oxide content is 1.4%, and the productive rate of magnesium chloride is 89.3%.

[0051] Add 2000 grams of electrolyte in the electro...

Embodiment 2

[0053] The preparation method of anhydrous magnesium chloride is with embodiment 1.

[0054] Add 2500 grams of electrolyte to the electrolyzer in the tank without separator, its composition NaCl: 45%, KCl: 10%, MgCl 2 : 12%, CaCl 2 : 25%, MgF 2 : 3%, CaF 2 : 2%, NdCl 3 : 3%,. The conductivity of the electrolyte: 3.02S / m, the solubility of MgO in the electrolyte is 1.70g / 100g, the electrolysis voltage is 4.9V, the electrolysis current is 40 amperes, and the pole distance is 8cm. Current efficiency: 91.2%, power consumption: 12.1kWh / Kg-Mg, purity of magnesium: 99.9%.

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Abstract

The invention relates to method to dewater to bischofite and electrolyse to obtain magnesium. Wherein, using improved reaction crystal coupling dewater technique to prepare anhydrous magnesium chloride with magnesia of 1-2% more cheaper, adding new electrolyte system with fluorides (such as, MgF2, LiF, NaF and CaF2) and rare-earth chloridate (such as, NdCl3, LaCl3) to increase effectively the solubility of MgO in complex electrolyte system and make the said anhydrous magnesium chloride fit to the require raw material, eliminating the negative effect of MgO in the process. This method can increase the current efficiency, makes the MgO impurity achieve 3%, and decease dewatering cost.

Description

technical field [0001] The invention relates to a method for dehydrating bischofite and then electrolytically refining magnesium, in particular to a method for preparing anhydrous magnesium chloride by dehydrating bischofite in salt lake production, and electrolytically refining magnesium from anhydrous magnesium chloride. technical background [0002] Magnesium is a "green and environmentally friendly material" in the 21st century. It is widely used in aerospace, transportation and electronic communication fields due to its excellent performance. Focus, the production of magnesium metal has attracted widespread attention. The extraction of metal magnesium mainly includes molten salt electrolysis and metal thermal reduction. The advantage of electrolytic production of magnesium metal is continuous operation. Through the optimized design of the electrolytic cell, the production scale can be expanded, and it is also environmentally friendly. Except for China, the production ...

Claims

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Application Information

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IPC IPC(8): C01F5/34C25C3/04
Inventor 宋兴福李冰李小松汪瑾陈金钟刘江宁于建国
Owner EAST CHINA UNIV OF SCI & TECH
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