Method capable of improving rare-earth mineral conversion efficiency in rare-earth wet-process smelting

Abstract

The invention discloses a method capable of improving rare-earth mineral conversion efficiency in rare-earth wet-process smelting. The method comprises the following steps: performing oxidization roasting on rear-earth concentrate to obtain rare-earth roasted concentrate, adding alkaline into the rare-earth roasted concentrate to uniformly mix, roasting, and washing and pickling the obtained roasted concentrate. According to the method disclosed by the invention, the rare-earth concentrate is roasted and then is added with alkaline to roast, so that surface reaction defects of concentrate particles can be effectively eliminated, reaction inside the concentrate particles also can be complete, alkaline conversion effect is improved, and the low conversion efficiency problem at present is solved; and meanwhile, the rear-earth wet-process metallurgical process formed by the method can directly add acid into a reaction tank once to leach rare earth, is optimized, and avoids the problems that the original process materials are transferred by many times, energy consumption is high and production efficiency is low.

Description

technical field [0001] The invention relates to the technical field of rare earth hydrometallurgy, in particular to a method for improving the conversion rate of rare earth ore in rare earth hydrometallurgy. Background technique [0002] For a long time, for the smelting process of rare earth ore, the process flow of rare earth concentrate roasting, primary leaching, alkali conversion, water washing, and secondary leaching has been adopted. This process is long and the materials are transferred many times. It needs to continue to react for 16 hours in the stirring state of the tank to achieve a good conversion rate, and the process has very high requirements on alkalinity, temperature, stirring intensity and time. [0003] In order to shorten the process flow, reduce energy consumption, and increase the dissolution rate of rare earths, many people have also proposed that rare earth concentrates be directly roasted and converted by adding alkali. A large number of experiments...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the conversion rate of rare earth ore in rare earth hydrometallurgy in view of the above-mentioned problems. First, the rare earth concentrate is roasted, and then the addition and subtraction of roasting is carried out, so that the concentrate can be effectively eliminated. The surface reaction defects of the particles make the inside of the concentrate particles react completely, the alkali conversion effect is improved, and the deep conversion is achieved, which solves the problem of low conversion efficiency at present. At the same time, the rare earth hydrometallurgical process formed based on this method can directly The rare earth is leached with acid once in the reaction tank, which has been optimized in the process, avoiding the problems of multiple transfers of the original process materials, high energy consumption and low production efficiency