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Method for preparing magnesium alloy by electrolysis using magnesium oxide as raw material

A magnesium oxide and magnesium alloy technology, applied in the preparation of magnesium alloys, using magnesium oxide as a raw material to electrolytically prepare magnesium alloys, can solve the problems of restricting the commercialization of magnesium alloys, difficulty in continuous production, complicated process, etc., and achieve low cost , small component segregation, simple process

Active Publication Date: 2017-08-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the segregation of alloy components is small and the burning loss of the alloy is small; the disadvantage is that the cathode needs to be replaced in time, it is not easy to carry out continuous production, and it is difficult to industrialize; in addition, the cathode of metal magnesium or magnesium alloy is prepared separately, which increases the process flow and increases cost
At present, the preparation of this electrolyte melt is carried out by using anhydrous magnesium chloride and anhydrous metal inorganic salts as raw materials, but the preparation process of anhydrous magnesium chloride and some anhydrous metal inorganic salts is complicated and the production cost is high, which restricts the preparation of this method. Commercialization of Magnesium Alloys

Method used

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  • Method for preparing magnesium alloy by electrolysis using magnesium oxide as raw material
  • Method for preparing magnesium alloy by electrolysis using magnesium oxide as raw material
  • Method for preparing magnesium alloy by electrolysis using magnesium oxide as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Mix 2.61g of magnesium oxide, 80.04g of lithium chloride monohydrate, 56.19g of potassium chloride, 3.18g of calcium fluoride and 28.20g of ammonium chloride into a 200mL crucible. After the crucible is covered with a lid, it is incubated at 300°C for 1.5 hours, then at 500°C for 0.5 hour, and the melt containing anhydrous magnesium chloride and anhydrous lithium chloride (the melt composition is: KCl (45.10wt.%) )-(2.26wt.%)NaCl-MgCl 2 (4.98wt.%)-LiCl(45.10wt.%)-CaF 2 (3.18 wt.%)). The melt was very pure and no impurities were observed. Then, the melt is electrolyzed in an electrolytic cell, wherein the electrolysis conditions are: the melt is an electrolyte, the spectrally pure graphite rod of Φ6mm is an anode, the steel wire of Φ1mm is a negative electrode, and a graphite crucible with a volume of 200mL is an electrolytic cell. The electrolysis temperature is 440°C, the pole distance is 4cm, and the cathode current density is 5.4A / cm 2 , the tank voltage is 8.3-8...

Embodiment 2

[0101] 6.97g magnesium oxide, 26.30g lithium chloride hydrate (LiCl 0.5H 2 (2), 43.40g potassium chloride, 2.17g sodium chloride, 4.02g calcium fluoride and 40.30g ammonium chloride are mixed and added in a 200mL crucible. After the crucible was covered with a lid, it was incubated at 300°C for 2 hours, then at 480°C for 1 hour, and a melt containing anhydrous magnesium chloride and anhydrous lithium chloride was obtained (melt composition: KCl (39.61wt.%) )-NaCl(1.98wt.%)-MgCl 2(15.13wt.%)-LiCl(39.61wt.%)-CaF 2 (3.67 wt.%)). The melt was very pure and no impurities were observed. Then, the melt is electrolyzed in an electrolytic cell, wherein the electrolysis conditions are: the melt is an electrolyte, the spectrally pure graphite rod of Φ6mm is an anode, the steel wire of Φ1mm is a negative electrode, and a graphite crucible with a volume of 200mL is an electrolytic cell. The electrolysis temperature is 480°C, the pole distance is 4cm, and the cathode current density is ...

Embodiment 3

[0105] Mix 14.00g of magnesium oxide, 100.00g of potassium chloride, 11.40g of lanthanum chloride heptahydrate, 4.88g of calcium fluoride and 66.24g of ammonium chloride into a 200mL crucible. After the crucible was covered with a lid, it was incubated at 400° C. for 1.5 hours, and then at 700° C. for 1 hour to obtain a melt containing anhydrous magnesium chloride and anhydrous lanthanum chloride (melt composition: KCl (68.65wt.%) )-MgCl 2 (23.14wt.%)-LaCl 3 (5.17wt.%)-CaF 2 (3.35wt.%)), the melt is very pure, no impurities can be observed. Then, the melt is electrolyzed in an electrolytic cell, wherein the electrolysis conditions are: the melt is an electrolyte, the spectrally pure graphite rod of Φ6mm is an anode, the steel wire of Φ1mm is a negative electrode, and a graphite crucible with a volume of 200mL is an electrolytic cell. The electrolysis temperature is 690°C, the pole distance is 4cm, and the cathode current density is 6.3A / cm 2 , the tank voltage is 7.9-8.3V,...

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Abstract

Provided is a method for preparing a magnesium alloy by electrolysis using magnesium oxide as a raw material, comprising: (a) evenly mixing magnesium oxide, compounds of the other metal elements in the magnesium alloy, ammonium chloride, potassium chloride and additives to prepare a mixture, wherein the compounds of the other metal elements in the magnesium alloy are selected from one of the group consisting of: chlorides of the other metal elements in the magnesium alloy, oxides of the other metal elements in the magnesium alloy, and chlorides and oxides of the other metal elements in the magnesium alloy; (b) heating the mixture prepared in step (a) to a melting state, so as to prepare an electrolyte melt; and (c) electrolysing the electrolyte melt prepared in step (b), so as to obtain the magnesium alloy. The method of the present invention has a simple process, enables a continuous production, has a high degree of automation, is easy to operate and control and good in terms of environmental protection, and at the same time omits the process of producing metal magnesium and metals for the alloy, thereby shortening the overall manufacturing process of the magnesium alloy and reducing emissions and energy consumption.

Description

technical field [0001] The invention belongs to the field of alloy preparation, and in particular relates to a method for preparing a magnesium alloy, in particular to a method for electrolytically preparing a magnesium alloy by using magnesium oxide as a raw material. Background technique [0002] Due to its low density, high specific strength and specific stiffness, good shock absorption, and easy recycling, magnesium alloys are widely used in automobile manufacturing, aerospace and other industries, and will become the "metal of the age" in the 21st century. ". [0003] At present, the preparation methods of magnesium alloys are as follows: [0004] (1) pair mixing method. It is to put magnesium metal and various metal elements into the melting furnace after pretreatment, and smelt it under the protection of flux to alloy it, and then make magnesium alloy. This method is simple in technology and is a commonly used method in industry at present. However, due to the low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
CPCC25C3/36
Inventor 卢旭晨张志敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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