Method for continuously producing high-quality rare-earth ferrosilicon alloy by adopting carbon-thermal method process

Abstract

The invention discloses a method for continuously producing rare-earth ferrosilicon alloy by a carbon-thermal method. The method aims to overcome the defects of an existing method for preparing rare-earth iron alloy by a carbon-thermal reduction process in the aspect of continuous production and to solve the problem of the existing method for preparing the rare-earth iron alloy by the carbon-thermal reduction process in the aspect of improving the product quality. The core content of the scheme is a batching process method based on a core-shell multi-layer structure and a batching and smeltingprocess method, one-step smelting is carried out through a submerged arc furnace so that the furnace bottom rising situation can be effectively avoided, therefore, continuous operation is realized and a high-quality rare-earth ferrosilicon alloy product is obtained, meanwhile, the smelting operation condition is similar to that of the ferrosilicon alloy, the operation procedure of a working surface becomes simpler and more convenient, and the energy consumption level is obviously reduced.

Description

technical field [0001] The invention relates to a method for continuously producing high-quality rare earth ferrosilicon alloy by carbothermal process, which belongs to the technical field of rare earth alloy preparation by pyrometallurgy. Background technique [0002] Rare earth ferrosilicon alloy is the main product of my country's rare earth master alloy industry, and it is also the key raw material for the production of rare earth magnesium ferrosilicon and other rare earth silicon-based alloys. Both are extremely important special alloys for metallurgical industry. [0003] The production methods of rare earth alloys mainly include electrosilicothermal method, carbothermal reduction method, molten salt electrolysis method and blending method. For the industrial production of rare earth ferroalloys, only the first two methods can meet the conditions for large-scale industrial production. and industry value. The most traditional method of producing rare earth ferrosilico...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of the carbothermal process is that the reaction intermediate product "carbides of rare earth metals" is easy to gather and form furnace nodules during smelting, which makes the furnace bottom rise rapidly and the furnace condition deteriorates, which seriously affects the continuous production of rare earth ferrosilicon.

In the actual process of production technology development, although the domestic rare earth ferroalloy technology and industry have made a series of improvements and adjustments in ingredients, electrical operation, and power configuration after years of research and industrialization tests, they can only delay the development of the furnace. Bottom rise cannot fundamentally solve the problem of continuous production

Another problem with industrial commonality is that compared with the electrosilicon thermal process, the quality of the rare earth ferrosilicon alloy products of the carbothermal process is significantly different, and the quality control is often not stable enough.