Process for preparing rare earth silicon alloy with rare earth enrichment

Abstract

The invention relates to the field of preparation of rare earth alloys, in particular to a process for preparing rare earth silicon alloys from rare earth enriched materials. Mix the rare earth enrichment, carbon powder, and plant adhesives, extrude them into agglomerates, and then put the agglomerates into the submerged arc furnace for self-baking and coking. During the inner surface layer and sinking process of the submerged arc furnace, Self-baking and coking treatment into coking agglomerates; adding silica, gas coke and charcoal to the coking agglomerates, smelting in submerged arc furnaces; then casting and crushing to obtain rare earth silicon alloy finished products. The rare earth recovery rate of the present invention is more than or equal to 96%, the power consumption is reduced to 8000-9000kwh / t, the furnace life is extended to more than 25 months, and the product quality is stable.

Description

technical field [0001] The invention relates to the field of preparation of rare earth alloys, in particular to a process for preparing rare earth silicon alloys from rare earth enriched materials. Background technique [0002] At present, there are four main production methods of rare earth alloys: electrothermal silicon method, carbon reduction method, molten salt electrolysis method or blending method. [0003] The above methods have their own advantages and disadvantages, but there are common problems such as energy consumption, low recovery rate of rare earths, short furnace life or long production cycle, which restrict the development of rare earth alloy industry. [0004] The patent application proposed by the inventor, the application number is: 01107843.X, the application time is February 28, 2001, and the patent application named "process and product thereof for producing high rare earth ferroalloy in submerged arc furnace" has proposed The fifth method, the fifth...

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Problems solved by technology

[0005] 1. The raw material requirements for rare earth enrichment are high, and the selection range is narrow, so the cost of rare earth silicon alloy is relatively high;

[0006] 2. The bonding degree of the adhesive is low, resulting in insufficient agglomerate strength, which affects the yield of rare earth, and the carbon-based adhesive pollutes the environment;

[0007] 3. The raw materials selected for this process limit its potential gradient, which can only be limited to small-scale production in small furnaces. If it is copied to large furnaces, it will cause the problem of rising the furnace bottom in the high-temperature crucible area, and the furnace life will be short;

[0008] 4. The rare earth recovery rate of this process is low

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