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Abstract

The present invention relates to the technical field of comprehensive recovery and utilization of mineral resources, in particular to a method of extracting lithium from spodumene and meanwhile recovering low iron and low sulfur silicon aluminum micro-powder, high purity gypsum, tantalum niobium concentrate and lithium rich iron material. The method of the present invention comprises: mixing and leaching the lithium extraction acid clinker of spodumene with water; filtering the leached pulp to obtain the filtrate 1 and the filter residue 1; neutralizing the filtrate 1; filtering the neutralized pulp to obtain the filtrate 2 and high purity gypsum, extracting lithium from the filtrate 2 to obtain lithium salt; neutralizing and mixing the filter residue 1 to obtain the coarse and fine particles by classification; carrying out weak magnetic separation of fine particles to obtain lithium rich iron material and non-magnetic material; and carrying out strong magnetic separation, strong magnetic material gravity separation and tantalum niobium crude concentrate pickling on the non-magnetic material to obtain tantalum niobium concentrate. The present invention solves the major problem that the slag plaguing the lithium salt industry is difficult to deal with; and the present invention also gives priority to the separation of gypsum, which can simplify the subsequent treatment of lithium slag and provide high-quality low iron and low sulfur silicon aluminum micro-powder, high purity gypsum, tantalum niobium concentrate and lithium rich iron material.

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First Claim