Method for producing rare earth ferrosilicon alloy

Abstract

The invention discloses a method for producing rare earth ferrosilicon alloy. The technical purpose is to provide a method which can increase the yield of rare earth in the alloy, increase the conversion and utilization rate of silicon in a silicon reducing agent, increase the content of Si in the alloy by reducing burning loss of silicon, lower the power consumption for reduction, and reduce thetechnological slag yield based on cerium-enriched slag raw materials aiming at the many insufficiencies of an existing silicothermic method of producing the rare earth ferrosilicon alloy. According tothe method, based on the cerium-enriched slag raw materials, the rare earth ferrosilicon alloy is produced, in the process of smelting the alloy under the temperature of 1,200 DEG C or below, the method can be smoothly implemented, the yield of the rare earth in the process of producing the rare earth ferrosilicon alloy by using the silicothermic process is greatly increased, and the technical purposes of increasing the conversion and utilization rate of the silicon element, and increasing the content of Si in the alloy by reducing the burning loss of silicon are achieved. In the meanwhile, the technology requirement for the smelting reduction temperature is lowered, the production period of the smelting processes is obviously shortened, and therefore, power consumption in the smelting process is obviously lowered.

Description

technical field [0001] The invention relates to a method for producing rare earth ferrosilicon alloy, which belongs to the technical field of rare earth pyrometallurgy; the technology requires the use of industrial waste residue as a metallurgical raw material, and also belongs to the technical field of comprehensive utilization of waste resources. Background technique [0002] Rare earth ferrosilicon alloy is the main product of my country's rare earth master alloy industry. It is a master alloy composed of rare earth and ferrosilicon. It can be used not only as a deoxidizer, desulfurizer and alloy additive in steelmaking production, but also as a cast iron production Inoculants, vermicularizers and nodulizers. It can significantly improve the plasticity and toughness of steel, especially the transverse plasticity and toughness and low temperature plasticity and toughness, and has good stamping performance. At present, various types of rare earth ferrosilicon alloys have be...

AI Technical Summary

Problems solved by technology

[0005] In recent years, based on the protection of rare earth resources, production cost factors and the promotion of balanced development of the rare earth industry chain, domestic rare earth ferrosilicon production enterprises have begun to try to use cerium-rich slag (derived from the process produced by Sichuan bastnaesite hydrometallurgy) Waste slag) as the rare earth raw material of the silicothermal method, although it has been continuously improved for several years, its rare earth yield can only reach about 45%, the unit power consumption is 3300-3400 degrees / ton, and the waste slag discharge of 1t alloy smelting is reduced to 1.5t

[0006] Generally speaking, the silicothermal process generally requires a reduction reaction at a high temperature above 1400°C, and there is a low recovery rate of rare earth elements (between 45% and 65% depending on the raw material), and the Si content in the alloy Low (generally less than 44%), high total power consumption (3300-3400kW h per ton of rare earth ferrosilicon alloy), and large amount of slag produced by the process

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