METHOD OF EXTRACTION OF LITHIUM FROM THE MIXTURE OF THE LEPIDOLITE AND SPODUMENE CONCENTRATES Russian patent published in 2007 - IPC C22B26/12 

FIELD: metallurgy industry; methods of reprocessing of the lepidolite and spodumene concentrates.

SUBSTANCE: the invention is pertaining to the field of metallurgy industry, in particular, to the method of reprocessing of the lepidolite and spodumene concentrates. The method provides for preparation of the charge out of the mixture of the concentrates and the flux, activating preparation of the charge, the water leaching of the activated charge. Preparation of the charge is made out of the mixture of the concentrates to obtain the mass ratio SiO₂ /(Na₂O+K₂O-Li₂O) in the mixture equal to 4.5, and soda ash on the basis of obtaining of the mass ratio SiO₂ / (Na₂O+K₂O+Li₂O) in the charge equal to 2.5. The activating preparation of the charge is conducted by the charge smelting at the temperature of 1350°С, the following granularities of a fusion cake by the water, grinding of the granulated fusion cake, and before the water leaching prepare the fine pulp composed of the ground granular fusion cake and add in it sulfuric acid for the lithium conversion into the water-soluble lithium sulfate. The technical result of the invention is the increased degree of extraction of the lithium, the reduced consumption of the flux and reduction of the prime cost.

EFFECT: the invention ensures the increased degree of extraction of lithium, the reduced consumption of the flux and reduction of the prime cost.

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