Method for lithium extraction by leaching from spodumene and desulfurization

Abstract

A method for lithium extraction by leaching from spodumene and desulfurization is provided. The method includes: extracting lithium by leaching from spodumene to obtain lithium leaching solution and spodumene smelting slag; performing desulfurization on the spodumene smelting slag to obtain a gypsum product and desulfurized lithium slag; wherein the desulfurization comprises: S21, mixing the spodumene smelting slag with water, and adjusting a pH value to 8-12.5 to prepare a mineral slurry; S22, adding a conditioning agent to the mineral slurry for conditioning to obtain slurry 1; wherein the conditioning agent includes sodium silicate, sodium citrate, and ethylenediaminetetra(methylenephosphonic acid) sodium salt; and S23, adding a collecting agent to slurry 1, performing flotation desulfurization, followed by filtration and drying, to obtain the gypsum product and the desulfurized lithium slag. The desulfurization method provided in the present disclosure achieves high desulfurization efficiency and a simple process flow.

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