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Method for producing calcium metal by performing electrodeposition and refining synchronously

A metal calcium, electrowinning technology, applied in the field of molten salt electrolysis, can solve the problems of reducing current efficiency, increasing power consumption, interfering with anode operation, etc., to achieve the effect of improving purity and reducing losses

Active Publication Date: 2014-07-02
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 1. Electrolytic preparation and electrolytic refining are carried out in two different sets of equipment, resulting in increased heating energy consumption and low space utilization
Moreover, both electrolysis and refining need to provide current separately, and the power consumption increases;
[0009] 2. As the electrolysis proceeds, the calcium content in the calcium-tin alloy gradually increases, resulting in a gradual increase in the potential of electrolytically desorbing calcium metal, and an increase in power consumption
If the generated metallic calcium cannot enter the alloy in time, it is easy to form metallic calcium beads and float upward to the anode area, which not only interferes with the operation of the anode, but more importantly, reduces the current efficiency

Method used

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  • Method for producing calcium metal by performing electrodeposition and refining synchronously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] with CaCl 2 and BaCl 2 Prepare the heavy phase calcium-containing molten salt as the raw material, and the measured density at 850°C is 2.58g / cm 3. With pure CaCl 2 It is a light-phase calcium-containing molten salt with a density of 2.05g / cm at 850°C 3 . Prepare the mesophase with metal copper and metal calcium, and adjust the ratio so that the density is 2.26g / cm after it is completely melted at 850°C 3 . Under the protection of argon, the pre-melted heavy phase, intermediate phase, and light phase were respectively injected into the molten salt electrolytic cell whose temperature was stabilized at 850°C. Make it form a stable three-layer liquid structure. A graphite anode is inserted in the anode area, and an iron rod cathode is inserted in the light phase of the cathode area. Through direct current electrolysis. The cathode gradually produces metallic calcium floating on the surface of the molten salt. When metallic calcium accumulates to a certain extent,...

Embodiment 2

[0041] with CaCl 2 and BaCl 2 Prepare the heavy phase calcium-containing molten salt as the raw material, and the measured density at 850°C is 2.58g / cm 3 . with CaCl 2 Prepare light-phase calcium-containing molten salt with LiCl as raw material, and the measured density is 1.87g / cm at 850°C 3 . Prepare the mesophase with metal copper and metal calcium, and adjust the ratio so that the density after melting completely at 850°C is 2.20g / cm 3 . Under the protection of argon, the pre-melted heavy phase, intermediate phase, and light phase were respectively injected into the molten salt electrolytic cell whose temperature was stabilized at 850°C. Make it form a stable three-layer liquid structure. A graphite anode is inserted in the anode area, and an iron rod cathode is inserted in the light phase of the cathode area. Through direct current electrolysis. The cathode gradually produces metallic calcium floating on the surface of the molten salt. When metallic calcium accu...

Embodiment 3

[0043] with CaCl 2 and BaCl 2 Prepare heavy-phase calcium-containing molten salt as the raw material, and the measured density is 2.43g / cm at 800°C 3 . with CaCl 2 Prepare light-phase calcium-containing molten salt with KCl as raw material, and the measured density is 1.80g / cm at 800°C 3 . Prepare the mesophase with metal aluminum and metal calcium, adjust the ratio so that the density after melting completely at 800°C is 2.20g / cm 3 . Under the protection of argon, the pre-melted heavy phase, intermediate phase, and light phase were respectively injected into the molten salt electrolytic cell whose temperature was stabilized at 800 °C. Make it form a stable three-layer liquid structure. A graphite anode is inserted in the anode area, and an iron rod cathode is inserted in the light phase of the cathode area. Through direct current electrolysis. The cathode gradually produces metallic calcium floating on the surface of the molten salt. When metallic calcium accumulate...

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Abstract

The invention belongs to the technical field of molten salt electrolysis, and discloses a method for producing calcium metal by performing electrodeposition and refining synchronously. According to the method, three stable liquid layers with different densities are established in an electrolytic cell, wherein the three stable liquid layers respectively are light-phase calcium-containing molten salt of which the density is higher than calcium metal, heavy-phase calcium-containing molten salt of which the density is higher than the light-phase calcium-containing molten salt, and a molten calcium alloy intermediate phase of which the density is between the density of the heavy phase and the density of the light phase; the molten calcium alloy intermediate phase is taken as a bipolar electrode, the side of the molten calcium alloy intermediate phase, which is in contact with the heavy-phase calcium-containing molten salt is used as a liquid cathode for dissolving calcium metal generated by electrodeposition, and the side of the molten calcium alloy intermediate phase, which is in contact with the light-phase calcium-containing molten salt is used as a soluble anode for precipitating element calcium out of the heavy-phase calcium-containing molten salt in the form of calcium metal at the cathode. By adopting the method, the electrodeposition and refining of calcium metal are realized at the same time in one electrolytic cell, and physical isolation of the heavy phase from the light phase as well as holding of impurities are realized through the intermediate phase, so that the purity of the finished product of calcium metal is improved.

Description

technical field [0001] The invention belongs to the technical field of molten salt electrolysis, and in particular relates to a method for synchronously producing metallic calcium by electrowinning and refining. Background technique [0002] Metallic calcium and high-purity calcium are widely used in metallurgy, petrochemical industry, battery energy and other fields. As a reducing agent for many high-purity metals and rare earth materials, the purity of metallic calcium directly affects the purity of the resulting product, so the preparation of high-purity metallic calcium has very practical significance. [0003] Traditionally, the industrial methods for preparing calcium metal are mainly electrolysis and thermal reduction. The thermal reduction methods are mainly aluminothermic reduction method and silicon thermal reduction method. The calcium metal products are collected by using the volatile properties of calcium metal under high temperature and high vacuum. Due to t...

Claims

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Application Information

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IPC IPC(8): C25C3/02
Inventor 张绘齐涛杨轩王硕郭九吉杜志华李永利
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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