A kind of reducing molten salt medium and preparation method thereof

Abstract

The invention relates to the technical field of metal material preparation, and specifically discloses a reducing molten salt medium and a preparation method thereof. The preparation method of described reducing molten salt medium, it uses mixed salt MaOH-Ma 2 CO 3 ‑MaCl as raw material, mixture MaY‑MeY 2 Flux for molten salt medium; MaOH‑Ma 2 CO 3 ‑MaCl melts to form MaOH‑Ma 2 CO 3 ‑MaCl molten salt, put into molten MaY‑MeY 2 In the molten salt medium flux, the electrolytic reaction is carried out to obtain the described reducing molten salt medium; the described reducing molten salt medium is MaY-MeY 2 ‑Ma; wherein, Ma represents an alkali metal; Me represents an alkaline earth metal; Y represents a halogen element. The preparation method of the invention can effectively solve the problems of low production efficiency and high energy consumption in the preparation of metal materials in the prior art.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to a reducing molten salt medium and a preparation method thereof. Background technique [0002] The basic methods for extracting valuable metals from minerals include: (1) extracting concentrates with high metal oxide or sulfide content from minerals by beneficiation; (2) converting concentrates into crude metals by smelting, and then Refining crude metals to obtain high-purity metals; or (3) first converting concentrates into metal compounds (metal oxides, metal halides, metal sulfides, etc.), 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] Lively Metal M 1 Thermal reduction of another metal compound M 2 X belongs to one of the high-temperature chemical preparat...

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Problems solved by technology

In addition, the metallothermic reduction process is accompanied by the release of a large amount of reaction heat, so that the reaction metal products are easily sintered with each other in situ to form porous particles with a sponge-like shape, and it is impossible to prepare ultra-fine metal powders.

[0007] In metallothermal reduction method, alkali metal (Ma) and alkaline earth metal (Me) have been widely used as reducing agent to prepare various metals in metallothermal reduction method, and its main deficiency is: (1) alkali metal, alkaline earth metal The high price itself leads to high cost of the reduction process; (2) Due to the chemical activity of alkali metals and alkaline earth metals, direct use of these metal reducing agents causes operational hazards, high safety management requirements, and great difficulty; (3) The thermal reduction process releases a large amount of reaction (4) Due to the strong volatility of alkali metals and alkaline earth metals at high temperatures, chemical erosion of furnace lining materials is likely to occur; (5) The production process is complicated; 6) The production cycle is long and the cost is high (7) The process consumes a lot of energy; (8) The process is a mass production process, which is difficult to achieve continuous or semi-continuous

[0016] (ii) Auxiliary electrolysis of molten salt medium containing alkaline earth metal oxide MeO to generate and regenerate alkali metal reducing agent in situ: solve the problem of excessive use of alkali metal reducing agent in existing alkali metal thermal reduction; overcome the limitation of existing metal thermal reduction It is difficult to realize the disadvantage of serialization in the mass production process

[0017] However, in the actual production process, the patent CN105274576B method has the problems of low production efficiency and increased energy consumption

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