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A method for preparing metal by continuous reduction in molten salt medium

A molten salt medium and metal technology, applied in the field of metal material preparation, can solve the problems of complex metal thermal reduction process, high safety management requirements, difficulty in achieving continuity, etc., to overcome the mass production process, solve the high safety management requirements, The effect of improving purity and utilization

Inactive Publication Date: 2017-12-22
AUYONG ADVANCED MATERIALS TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the shortcomings of complex and dangerous operation of directly added alkali metal reducing agent; solves the problem of high safety management requirements and great difficulty; assists in-situ generation and regeneration of alkali metal reducing agent by electrolytic molten salt medium: solves the problem of excessive use of alkali metal reduction It overcomes the shortcomings of the traditional alkali metal thermal reduction batch production process, which is difficult to achieve continuous operation; it also overcomes the existing disadvantages of complex metal thermal reduction process in molten salt medium, long production cycle, high cost, and large energy consumption.

Method used

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  • A method for preparing metal by continuous reduction in molten salt medium
  • A method for preparing metal by continuous reduction in molten salt medium
  • A method for preparing metal by continuous reduction in molten salt medium

Examples

Experimental program
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Effect test

Embodiment 1

[0081] Step 1 (preparation of molten salt medium):

[0082] Weigh 1.35 kg of CaCl respectively 2 and 0.65 kg of NaCl to make 2 kg of CaCl 2 / NaCl salt mixture. Put the mixed salt into the reaction vessel, and then heat it to 550-1000°C under the protection of argon atmosphere. When the above salt mixture is molten, 40-100 grams of CaO and 90-300 grams of NaCl are added to the molten salt mixture. After 0.5-2 hours, start auxiliary electrolysis. The electrolysis conditions are: use stainless steel as the cathode material, graphite as the anode material, and control the cell voltage within the range of 2-3.2 volts. When the molten salt medium is Na-NaCl-CaCl saturated with metallic sodium 2 When melted, end the auxiliary electrolysis. The electrolysis time is between 0.5-15 hours.

[0083] Step 2 (sodium thermal reduction of Ta 2 o 5 ):

[0084] The melt temperature is controlled within the range of 600-800°C, and about 50 grams of Ta 2 o 5 powder, with the support of...

Embodiment 2

[0086] Step 1 (preparation of molten salt medium):

[0087] Weigh 9.95 kg of CaCl respectively 2 and 20.05 kg of KCl to make 30 kg of CaCl 2 / KCl salt mixture. Put the mixed salt into the reaction vessel, and raise the temperature to 650-1000°C under the protection of argon atmosphere. After the above salt mixture is melted, 320-500 grams of CaO and 850-1000 grams of KCl are added to the melt respectively. After 0.5-2 hours, start auxiliary electrolysis. The electrolysis conditions are as follows: use stainless steel as the cathode and graphite as the anode, and control the cell voltage within the range of 2-3.2 volts. When the melt transforms into K-KCl-CaCl saturated with potassium metal 2 When the molten salt medium is used, the auxiliary electrolysis is terminated, and the required electrolysis time is between 0.5-15 hours.

[0088] Step 2 (potassium thermal reduction of Ta 2 o 5 ):

[0089] Under the protection of argon atmosphere, the temperature of the above mel...

Embodiment 3

[0091] Step 1 (preparation of molten salt medium):

[0092] Weigh 20.21 kg of CaCl respectively 2 and 9.79 kg of NaCl to prepare 30 kg of CaCl 2 / NaCl salt mixture. Add the mixed salt into the reaction vessel, and heat to 550-1000°C under the protection of argon atmosphere. When the above mixed salt is melted, 320-600 grams of CaO and 670-1000 grams of NaCl are added to the molten salt medium. After 0.5-2 hours, start auxiliary electrolysis. The electrolysis conditions are: use stainless steel as the cathode material, graphite as the anode material, control the cell voltage in the range of 2-3.2 volts, when the molten salt medium is converted into Na-NaCl-CaCl saturated with metal sodium 2 When melted, terminate the auxiliary electrolysis. The electrolysis time is between 0.5-15 hours.

[0093] Step 2 (sodium thermal reduction of Ta 2 o 5 ):

[0094] The melt temperature is controlled within the range of 600-1000°C. Then, under the protection of argon atmosphere, add...

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Abstract

The invention relates to a method for preparing metal materials. A method for preparing metal through continuous reduction in a molten salt medium, which uses molten alkali metal and alkaline earth metal mixed halide MaY-MeY2 as the flux of the molten salt medium, and uses an alkaline earth metal soluble in MaY-MeY2 as the flux of the molten salt medium The oxide MeO / alkali metal halide MaY mixture replaces the alkali metal as the reducing agent. A molten salt of MeO‑MaY‑MeY2 is formed when a specially selected MeO / MaY mixture is added to molten MaY‑MeY2 flux. Then decompose and melt the MeO in the medium by carrying out electrolysis to this molten salt medium, finally get a kind of molten salt medium that is Ma-MaY-MeY2; The oxide MO is added to the MaY‑MeY2 molten salt medium, and the alkali metal Ma immediately thermally reduces the added oxide MO to prepare the metal M. The invention overcomes the disadvantages of complicated and dangerous operation of alkali metal reducing agent directly added in traditional thermal reduction; solves the problem of excessive use of alkali metal reducing agent, realizes continuous production; and has low cost and low energy consumption.

Description

technical field [0001] The invention relates to the preparation of metal materials, in particular to a method for preparing metal materials in a molten salt medium. Background technique [0002] Metal oxides or sulfides are the main mineral forms of metal elements in the earth's crust. The basic methods for extracting valuable metals from minerals include: (1) using beneficiation to extract concentrates with high metal oxide or sulfide content from minerals; (2) using smelting to convert concentrates into crude metals, and then Refining crude metals to obtain high-purity metals; or (3) first converting concentrates into metal compounds (metal oxides, metal sulfides, or other forms of metal compounds), and then preparing metals from these metal compounds. The traditional preparation of metals from metal compounds relies on: (1) hydrometallurgical preparation, (2) high-temperature chemical preparation, and (3) electrochemical preparation. [0003] With Lively Metal M 1 Comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/04
Inventor 颜晓勇
Owner AUYONG ADVANCED MATERIALS TECH SHANGHAI CO LTD
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