Method for heating, melting, converting and decomposing rare earth mine

Abstract

The invention discloses a method for heating, melting, converting and decomposing a rare earth mine. Carbon materials (natural graphite, artificial graphite and the like) are added to an intermediatefrequency furnace or an electric arc furnace, and the rare earth mine added to a phosphorus removal and fluorine fixation material is molten by the functions of heating and electric arc heating of thecarbon materials. According to the method for heating, melting, converting and decomposing the rare earth mine, materials which can generate alloy heating and electric arc heating with rare earth arenot used, the extraction ratio of rare earth oxides is effectively improved, at the same time, noxious gas and waste water with fluorine are not produced, the phosphorus can be further recycled and utilized, and the industrial cost is lowered while environmental protection is achieved.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for heating, melting, transforming and decomposing rare earth ores. Background technique [0002] Rare earth ore is an important rare earth resource in the world, including mixed rare earth ore, bastnaesite rare earth ore, monazite rare earth ore, etc. [0003] At present, there are various smelting and separation methods for rare earth elements, and many acidic rare earth solution systems are involved. Among them, sulfuric acid is widely used in the smelting and separation process due to its high stability, low volatility, and weak corrosion to equipment, such as roasting transformation of Baotou mine sulfuric acid decomposition method. The process of enriching and recovering rare earths in sulfuric acid rare earth solution or mixed acid solution system is relatively common, but converting and decomposing rare earths in the way of medium temperature roasting i...

AI Technical Summary

Problems solved by technology

The process of enriching and recovering rare earths in sulfuric acid rare earth solution or mixed acid solution system is relatively common, but converting and decomposing rare earths in the way of medium temperature roasting in sulfuric acid, it is easy to produce hydrogen fluoride and a large amount of sulfide gas, and at the same time, phosphorus is solidified in non-rare earth slag Discarding is not conducive to environmental protection, and there is a waste of phosphate rock resources