HIGH-VALUE COMPREHENSIVE UTILIZATION METHOD FOR LITHIUM SLAG

摘要

A comprehensive utilization method for lithium slag, which is used on slag obtained after extracting lithium from spodumene by means of a sulfuric acid method and which comprises the following steps: (1) slurrying and stirring lithium slag such that a sulfate mineral in the lithium slag is in a dispersed suspension state; (2) desulfurizing the product obtained in step (1) by using a manner of physical mineral separation to obtain a desulfurization slurry and a tailing output slag; (3) magnetically separating the desulfurized slurry obtained in step (2) under the condition of a magnetic field strength of 0.5-2.0 T to obtain a magnetic separation slurry and a magnetic separation tailing slag; then, concentrating, filtering and drying the obtained magnetic separation slurry to obtain a pyrophyllite raw material for use with glass fiber. The tailing output slag obtained in step (2) is dried and dehydrated, and then used as a gypsum-based putty or a mortar filler raw material; the magnetic separation slag obtained in step (3) is used as a building material, and the building material comprises a cement admixture or a brick making raw material.