METHOD FOR EXTRACTION OF GALLIUM FROM FLY ASH Russian patent published in 2014 - IPC C22B58/00 C22B3/24 C22B7/02 

FIELD: metallurgy.

SUBSTANCE: method involves fly ash crushing, removal of Fe by magnetic separation; then, its dilution in a hydrochloric acid so that a hydrochloric leaching product is obtained. Then, adsorption of gallium contained in the hydrochloric leaching product is performed by means of macroporous cationic resin with further production of eluent containing gallium; addition of sodium hydroxide solution to the eluent for carrying out the reaction and obtaining a sodium metaaluminate solution containing gallium. Then, CO₂ is added to the sodium metaaluminate solution containing gallium for carbonisation with further separation of gallium from aluminium and production of double aluminium-gallium salt at the gallium to alumina weight ratio comprising more than 1:340. Then, double aluminium-gallium salt is added to sodium hydroxide so that an alkali solution containing gallium and aluminium is obtained, and an electrolysis of the alkali solution containing gallium and aluminium is performed so that metallic gallium is obtained.

EFFECT: simplifying process and increasing gallium extraction degree.

20 cl, 3 dwg, 1 tbl, 10 ex