METHOD OF RECEIVING LITHIUM-BEARING ALUMINA FROM SPODUMENE CONCENTRATE Russian patent published in 2009 - IPC C22B26/12 C01F7/04 C22B3/08 

FIELD: metallurgy.

SUBSTANCE: method includes concentrate activation, its sulphation and leaching with extraction of aluminium sulfates and lithium into sulphate solution. From sulphate solution it is implemented deposition lithiumaluminiumbearing sediment. Before it sulphate solution is treated by caustic soda solution with deposition mixture of aluminium hydroxide and admixtures at pH=7.5÷8.0, mixture is separated from sulphate solution. From separated of mixture solution it is deposited lithiumaluminiumbearing sediment in the form of lithium hydrox-di- aluminate by solution of sodium aluminate and caustic soda, prepared by means of dissolution of technological aluminium hydroxide and precipitated from sulfate solution mixture of aluminium hydroxide and admixtures in solution of caustic soda, with following separation of received solution of sodium aluminate and caustic soda from insolubles. Deposited lithium hydrox-di-aluminate is tempered at temperature 400÷450°C with forming of stripped lithium-bearing alumina with increased content of lithium.

EFFECT: receiving of lithium-bearing alumina with increased content of lithium and low content of iron and silicon.

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