A method for reducing impurity content in molten magnesium chloride for magnesium electrolysis

A technology of impurity content and magnesium chloride, applied in the field of non-ferrous metal smelting, can solve the problems of high impurity content, affecting the smooth progress of the electrolysis process and the improvement of economic and technical indicators, and achieves the effects of safe operation, improved purity, and improved economic and technical indicators

Active Publication Date: 2019-05-24
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

It adopts the magnesium chloride down-flow production technology, and the impurities can be discharged from the reduction reactor in time, but the by-product magnesium chloride melt has a high impurity content, which affects the smooth progress of the electrolysis process and the improvement of economic and technical indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. The impurity content (mass percentage) in the magnesium chloride melt from the steaming process is respectively: MgO: 1.25%, total iron: 0.035%, and total titanium: 0.046%. Melt temperature is 752.9 ℃ in the gravity settling purification furnace, after stirring for 5min, let it stand for 2h to settle, after the settling finishes, the MgO content is 0.10% (mass percentage) to the upper clear liquid sampling test, after prolonging the settling time for 60min, in the upper clear liquid MgO content is 0.05% (mass percentage);

[0031] B. Extract the clarified melt from the upper part of the purification furnace and continuously add it to the purification electrolytic cell. The electrolytic cell uses KCl-NaCl-CaCl 2 Molten salt system, the molten salt composition (mass percentage) is KCl: 58%, NaCl: 25%, CaCl 2 : 3.0%, MgCl 2 : 14%, the melt temperature is 725°C, graphite anode and steel cathode are used, the electrolysis voltage is 4.9V, the electrode distance is 40mm, a...

Embodiment 2

[0033] A. The impurity content (mass percentage) in the magnesium chloride melt from the steaming process is respectively: MgO: 1.06%, total iron: 0.05%, and total titanium: 0.22%. Melt temperature is 756.5 ℃ in the gravity settling purification furnace, after stirring for 5min, let it settle down for 1.6h, after the settling finishes, the MgO content is 0.06% (mass percentage) to the upper clarified liquid sampling test;

[0034] B. Extract the clarified melt from the upper part of the purification furnace and continuously add it to the purification electrolytic cell. The electrolytic cell uses KCl-NaCl-CaCl 2 Molten salt system, the molten salt composition (mass percentage) is KCl: 55%, NaCl: 28%, CaCl 2 : 2.0%, MgCl 2 : 15%, the melt temperature is 713°C, graphite anode and steel cathode are used, the electrolysis voltage is 4.8V, the electrode distance is 40mm, and the current density is 0.3A / cm 2 . The impurity content (mass percentage) in the obtained purified melt is...

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Abstract

The invention belongs to the field of non-ferrous metal metallurgy, particularly relates to a method for reducing content of impurities in magnesium chloride melts for magnesium electrolysis and aimsto solve the technical problems to provide the method for reducing content of impurities in magnesium chloride melts for magnesium electrolysis. The method comprises steps as follows: (1) the magnesium chloride melts are put in a purification furnace to be heated to 750 DEG C plus / minus 10 DEG C, stirred and left to stand and settle until the mass percentage of upper clarified melts MgO is smallerthan or equal to 0.10%; (2) the clarified melts are extracted from the upper part of the purification furnace and added to a purification electrolytic bath, wherein the purification electrolytic bathadopts a KCl-NaCl-CaCl2 molten salt system, the temperature of the melts ranges from 690 DEG C to 730 DEG C, a graphite anode and a steel cathode are adopted, the electrolytic voltage is 2.8-5.5 V, the electrode distance is 30-60 mm and the current density is 0.2-0.8 A / cm<2>. By means of the method, the content of impurities such as MgO, Fe, Ti and the like in the magnesium chloride melts can beeffectively reduced, the purity of MgCl2 in the melts is improved, and the method has an important influence on improving the operation state and the current efficiency in the magnesium electrolysis process.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal smelting, in particular to the field of magnesium electrolysis matched with the sponge titanium production process, and more specifically to a method for reducing the impurity content in molten magnesium chloride for magnesium electrolysis. Background technique [0002] Titanium and titanium alloys have the advantages of high melting point, corrosion resistance, high specific strength, excellent high and low temperature mechanical properties and good biocompatibility, and are widely used in aerospace, marine development, petrochemical, clinical medicine, sports and leisure and other fields. Sponge titanium is used as the initial raw material for the preparation of metal titanium and titanium alloys, and its industrial production is made by magnesia thermal reduction-vacuum distillation. The whole process of magnesium thermal method to produce sponge titanium mainly includes three major processes: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/02C22B34/12
Inventor 苗庆东朱福兴马尚润李开华
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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