Method for leaching weathering crust eluvial type rare earth ore with aluminum inhibition

Abstract

The invention provides an impurity-inhibiting leaching method for inhibiting leaching of aluminum during weathering crust eluvial type rare earth ore leaching process. The method comprises that acetates are added in an ore leaching solution, the ore leaching solution is an ammonium sulfate solution or an ammonium chloride solution or a composite ammonium salt solution composed of the above solutions, the acetates are any one of ammonium acetate, sodium acetate and potassium acetate or any mixture thereof, and the addition amount of the acetates in the ore leaching solution is 0.005wt%-2wt%. In the method, the addition of the aluminum inhibitors can lower the aluminum ion content in the rare earth leaching solution by above 91% effectively, and has no influence on the leaching rate of rare earth, which are beneficial to subsequent processing of the rare earth mother solution. The addition of the aluminum inhibitors can inhibit expansion of clays well. The acetates are non-poisonous and the cost is low.

Description

technical field [0001] The invention belongs to the field of rare earth hydrometallurgy, and in particular relates to an impurity suppression leaching method for suppressing the leaching of aluminum during the leaching process of weathering crust leaching type rare earth ore. Background technique [0002] The weathering crust leaching type rare earth ore is a unique rare earth ore in my country. The content of medium and heavy rare earth is high and it is mainly adsorbed on clay minerals in the form of ions. Physical methods cannot enrich rare earths into corresponding rare earth concentrates, and only chemical method, using cations in a strong electrolyte (Na + 、K + , NH 4 + etc.) exchange with rare earth ions to extract rare earths to be enriched. The weathering crust leaching type rare earth ore contains not only ionic phase rare earths, but also ionic phase metal impurities, which can also be leached together with rare earths. Aluminum is the most abundant metal elem...

AI Technical Summary

Problems solved by technology

The idea of ​​using the hydroxyl aluminum cross-linked structure in the weathering crust elution-type rare earth ore makes the exchangeable aluminum ions between the mineral layers into a non-exchangeable structure. There is no report on this related aspect.