Quick impurity removing method for rare earth leach liquor of weathering crust elution-deposited rare earth ores

Abstract

The invention provides a quick impurity removing method for the rare earth leach liquor of weathering crust elution-deposited rare earth ores, and aims to solve the problems that the content of metal ions of impurities in the leach liquor of the weathering crust elution-deposited rare earth ores is high, a conventional impurity removing method is longer in process flow and complicated in operation, the precipitation and sedimentation speed of generated flocculated impurities is lower, and the quantity of adsorbed and carried rare earth is large. The method specifically comprises the following steps of (1) directly adding a mixed solution of ammonium hydrogen carbonate and inorganic sulfide into the rare earth leach liquor; (2) adding ammonia water or sulfuric acid to adjust the pH value of the mixed solution; (3) under the condition of stirring, adding a flocculating agent solution into the mixed solution, continuously stirring for 1h to 3h, then standing for sedimentation, and extracting supernatant liquor to obtain low-impurity rare earth leach liquor. According to the method, the sedimentation time of the impurities can be effectively shortened, the production efficiency is greatly improved, quick and full sedimentation of the impurities can be achieved, the rare earth of the obtained low-impurity rare earth leach liquor is high in recovery rate and high in purity, and the method is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a rapid impurity removal method for rare earth leaching liquid of weathering crust leaching type rare earth ore. Background technique [0002] Weathering crust eluvial rare earth ores are widely distributed in seven provinces including Jiangxi, Guangdong, Fujian, Hunan, Yunnan, Guangxi and Zhejiang. Because they are rich in medium and heavy rare earths with high commercial value, the mining of this mine has always been popular. It has been highly valued at home and abroad and has been identified as a strategic mineral. It is composed of rare earth-containing granite and volcanic rocks and other proto-rocks, which are weathered to form clay minerals such as kaolinite, halloysite, montmorillonite and illite through biological, chemical and physical actions in a warm and humid climate. The easily weathered rare earth minerals are also weathered and dissociated to form rar...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rapid impurity removal method for the rare earth leaching solution of weathering crust leaching type rare earth ore. The method is fast and thorough in impurity precipitation and settlement, and the recovery rate of rare earth is high, which can effectively solve the complicated impurity removal process in the existing impurity removal technology. , slow sedimentation speed, more rare earths entrained by adsorption and incomplete solid-liquid separation