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Method for preparing magnesium-zinc master alloy by molten salt electrolysis

A molten salt electrolysis and master alloy technology, which is applied in the field of magnesium-zinc master alloy preparation by molten salt electrolysis, can solve the problems of high energy consumption and increased oxidation loss, and achieve low corrosion, less volatilization loss, and uniformity Effect

Inactive Publication Date: 2017-02-01
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process of preparing and applying alloys is relatively long and consumes high energy consumption, especially the energy consumption of preparing the metal itself is relatively high. The preparation of alloys through secondary smelting will lead to higher energy consumption and increased oxidation losses.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: with MgCl 2 -LiCl-KCl-NaCl is the electrolyte system, the mass percentages of each component are 15%, 20%, 30%, and 35% respectively, the initial total mass of the electrolyte is 800g, 30g of zinc liquid is used as the sinking cathode, and the graphite crucible It can also be used as an anode, the electrolysis temperature is 660°C, the electrolysis voltage is 4.5-5.1V, and the anode current density is 0.1A / cm 2 , add 10g of anhydrous magnesium chloride to the electrolyzer every 30min. After 2 hours of constant current electrolysis at 10A, 35.40g of magnesium-zinc alloy with uniform composition was produced at the bottom of the electrolytic cell. The magnesium content in the alloy was 21.15wt%. X-ray diffraction analysis confirmed that the Mg-Zn alloy phase was MgZn 2 . The current efficiency of electrolysis is 82.56%.

Embodiment 2

[0045] Embodiment 2: with MgCl 2 -LiCl-KCl-NaCl is the electrolyte system, the mass percentages of each component are 15%, 15%, 35%, and 35% respectively, the initial total mass of the electrolyte is 800g, and 30g of zinc liquid is used as the sinking cathode, and the graphite crucible It can also be used as an anode, the electrolysis temperature is 670°C, the electrolysis voltage is 4.5-5.1V, and the anode current density is 0.1A / cm 2 , add 10g of anhydrous magnesium chloride to the electrolyzer every 30min. After 2 hours of 11A constant current electrolysis, 37.79g of magnesium-zinc alloy with uniform composition was produced at the bottom of the electrolytic cell. The magnesium content in the alloy was 24.79wt%, and the current efficiency of electrolysis was 93.92%.

[0046] In the above-mentioned examples 1 and 2, the electrolyte system consists of MgCl 2 , LiCl and other alkali metal chlorides KCl and NaCl.

Embodiment 3

[0047] Embodiment 3: with MgCl 2 -LiCl-KCl-NaCl-NaF is the electrolyte system, the mass percentage of each component is 10%, 10%, 40%, 39.5%, 0.5%, the initial total mass of the electrolyte is 800g, and 30g of zinc liquid is used as the following Sinking cathode, Ф5cm graphite rod as anode, electrolysis temperature 680°C, electrolysis voltage 4.5-5.1V, pole distance 3cm, anode current density 0.5A / cm 2 , add 15g of magnesium chloride dihydrate to the electrolyzer every 30min. After 2 hours of 10A constant current electrolysis, 34.17g of magnesium-zinc alloy with uniform composition was obtained at the bottom of the electrolytic cell. The magnesium content in the alloy was 17.76wt%, and the current efficiency was 66.95%.

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Abstract

The invention discloses a method for preparing a magnesium-zinc intermediate alloy through molten salt electrolysis. The method comprises the steps of taking liquid zinc or liquid magnesium-zinc alloy as a negative electrode and graphite as a positive electrode, wherein an electrolyte system contains magnesium chloride and lithium chloride, further contains chloride of non-lithium alkali metal or chloride of non-magnesium alkaline-earth metal, and the magnesium chloride accounts for 10-30% by mass in the electrolyte system; switching on power to electrolyze, keeping electrolysis temperature at 580-680 DEG C and electrolysis cell pressure under 3.5-5.5V, adding magnesium chloride to the electrolysis system as an electrolysis raw material along with electrolysis reaction, so that content of the magnesium chloride in the electrolyte system is kept within a range of 10-30% by mass, thus obtaining a magnesium-zinc alloy in an electrolysis cell.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy, in particular to a method for preparing a magnesium-zinc master alloy by a molten salt electrolysis method. Background technique [0002] The production of magnesium adopts different production methods according to different raw materials, namely silicon thermal method and electrolytic method. The silicothermal method is further divided into Pidgeon method, Bolzano method and Magnit method. At present, magnesium metal is mainly produced by the Pidgeon process in my country. The Pidgeon method to produce metal magnesium is based on calcined dolomite as raw material, ferrosilicon as reducing agent and fluorite as catalyst, and the reduction is carried out after batching. Due to the low investment of this method, and our country has cheap raw materials and labor, the Pidgeon method has a cost advantage over the electrolytic method of magnesium smelting. Therefore, the export share of ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
Inventor 吴志坚王世栋火焱叶秀深李权孙庆国周园朱军庞全世谭忠赵世帮刘伟朝
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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