Method for producing magnesium using bischofite as raw material

A bischofite and metal magnesium technology, applied in the field of metal materials, can solve the problems of difficult preparation of anhydrous magnesium chloride, etc., and achieve the effect of good crystal form, excellent texture and uniform particle size

Inactive Publication Date: 2005-09-07
UNIV OF SCI & TECH BEIJING
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method for producing magnesium metal from bischofite as raw material against the disadvantage of difficult dehydration of bischofite to produce anhydrous magnesium chloride

Method used

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Embodiment 1

[0016] Embodiment 1: In 120KA magnesium electrolyzer without clapboard, bischofite is raw material production of metallic magnesium

[0017] Using bischofite as raw material, use ammonia method at reaction temperature 50°C, reaction time 25min, magnesium-ammonia equivalent ratio 1:1.2, MgCl 2 Concentration is under the condition of 45g / L, produces magnesium hydroxide, calcines magnesium hydroxide in the range of 950 ℃ for 3h to obtain the high-purity magnesium oxide that purity is 99.5%; With lanthanum chloride and magnesium chloride mixed molten salt as electrolyte, lanthanum chloride and The mole percentage of magnesium chloride is 20%, the solubility weight percentage of magnesium oxide is 10%, the electrolysis temperature is 720°C, graphite is the anode, the cell voltage is 4.7V, the current efficiency reaches 90%, and the DC power consumption per kilogram of Mg is 11.53kWh, metal magnesium The purity of 99.95%.

Embodiment 2

[0018] Embodiment 2: in 65KA there is the magnesium electrolyzer of dividing plate to be raw material to produce metal magnesium

[0019] Using bischofite as raw material, use ammonia method at reaction temperature 40°C, reaction time 30min, magnesium-ammonia equivalent ratio 1.5:2.2, MgCl 2 Under the condition of 50g / L concentration, magnesium hydroxide is produced, and magnesium hydroxide is calcined within 1000°C for 4 hours to obtain high-purity magnesium oxide with a purity of 99.95%; the mixed molten salt of lanthanum chloride and magnesium chloride is used as electrolyte, lanthanum chloride and The mole percentage of magnesium chloride is 10%, the solubility weight percentage of magnesium oxide is 8%, the electrolysis temperature is 750°C, graphite is the anode, the cell voltage is 4.5V, the current efficiency reaches 85%, and the DC power consumption per kilogram of Mg is 11.67kWh. 99.95% pure.

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Abstract

A method of preparing magnesium metal with bischofite, pertains to the field of metallic material. The invention is characterized in that it takes the bischofite as stock and prepare magnesium hydroxide with ammonia process under the following conditions: at the temperature between 45~55 DEG C for 20~30 minutes, with the proportion between magnesium and ammonia 1:1.2~1.5:2.2 and with the concentration of magnesium chloride about 35~55 g/L, calcinating the magnesium hydroxide under the temperature of 900~1000 DEG C for 3-4hours, getting the magnesia with the purity of more than 99.5%,in the molten salt electrolyte system of lanthanum chloride and magnesium chloride, the proportion between lanthanum chloride and magnesium chloride in moles is 10~30%, the solubility of magnesia is 5~10 mass%, thaw temperature is 700~750 DEG C, the tank voltage 4.5~6.5 volt, the current efficiency comes to 85~90%, the consumption of the direct current of magnesium is 11~12.5kWh per kilogram and the purity of magnesium is above 95%. The method avoids the dehydration process of bischofite and is characterized by the energy-saving and consumption-deducing, the highly effective and cleaning of electrolytic process, particularly for its not emitting chlorine and not polluting the environment.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a method for producing magnesium metal using bischofite as a raw material. Background technique [0002] Qinghai Salt Lake is rich in potassium and magnesium resources. Among them, Chaerhan Salt Lake is located in the south-central Qaidam Basin of Qinghai Province. It is the only potassium fertilizer production base in my country, and its magnesium chloride reserves are 1.62 billion tons. In the production of potash fertilizer, every ton of potassium chloride produced can produce 10 tons of magnesium chloride by-product. After annual potash production in the Chaerhan Salt Lake area, a large amount of old brine can be produced, and the main component of the old brine is bischofite (MgCl 2 ·6H 2 O). At present, these old brines are not used and discarded, which not only causes a huge waste and pollution of resources, so that it becomes a "magnesium hazard", destroys th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02C01F5/20C22B3/14
CPCY02P10/20
Inventor 卢惠民
Owner UNIV OF SCI & TECH BEIJING
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