A method for the separation and production of rare earth ferrosilicon alloy by rotary hearth furnace

Abstract

The invention relates to a method for producing rare earth ferrosilicon alloy after separating iron-containing rare earth ore by using a rotary hearth furnace. Secondary agglomeration and (5) rare earth ferrosilicon smelting and other steps, by improving the setting of specific steps and each specific step, the overall efficiency of producing rare earth ferrosilicon alloy with iron-containing rare earth raw ore is improved, and the production cost is greatly reduced .

Description

technical field [0001] The invention belongs to the field of rare earth ore utilization, and in particular relates to a method for separating rare earth from iron-containing rare earth raw ore and then smelting rare earth ferrosilicon alloy. Background technique [0002] Rare earth ferrosilicon alloy is a very important additive in steel production. It can deoxidize, desulfurize and add rare earth in the steelmaking process. As the output of high value-added steel increases year by year, the demand for rare earth ferrosilicon alloy is also increasing, and There is also an increasing demand for rare earth content in rare earth ferrosilicon alloys. The traditional smelting of rare earth ferrosilicon alloys generally adopts ore-thermal method and carbon-thermal method. The ore-thermal method is mostly used in industrial production, which mainly uses lime as a solvent and ferrosilicon as a reducing agent to reduce rare earth ores, and produces rare earth ferrosilicon alloys by ...

AI Technical Summary

Problems solved by technology

However, due to the complex composition of rare earth ores, they are generally symbiotic with other metal ores. Many rare earth ores in northern my country are symbiotic deposits of rare earth, iron and niobium. and other impurities, and the reduction of metallic iron in an environment above 1700 °C will not only cause the charge to run smoothly, but also greatly increase the energy consumption of the submerged arc furnace, and the means of increasing the reducing dose such as coke will bring a great burden to the environment and higher production costs

It is difficult to smelt traditional iron-containing rare earth ores as raw materials for rare earth ferrosilicon alloys

[0003] After years of development, the rotary hearth furnace has become a common equipment for the production of pearl iron, sponge iron and metallized pellets. The rotary hearth furnace has the characteristics of low cost and high environmental friendliness as equipment for processing complex rare earth iron ore. However, the rotary hearth furnace There is no relevant report on the whole process of processing rare earth ore