METHOD OF EXTRACTION OF BERYLLIUM FROM BERYLLIUM CONCENTRATES Russian patent published in 2007 - IPC C01F1/00 C01F3/02 

FIELD: extraction of beryllium at processing the beryllium concentrates obtaining the beryllium sulfate solution.

SUBSTANCE: proposed method includes activation of concentrate, sulfating the activated concentrate by sulfuric acid, aqueous leaching-out of sulfated product, separation of leaching pulp into beryllium sulfate solution and cake, washing the cake with water for removal of beryllium sulfate, separation of pulp after washing into washing solution and waste cake. Beryllium concentrate is activated by grinding till obtaining roentgeno-amorphous product at size of particles lesser than 5 mcm; activated concentrate is sulfated by sulfuric acid for at least 0.5 h at temperature of 95-105°C at continuous mechanical removal of products of reaction from surfaces of concentrate particles, after which procedure is continued at temperature of 250-300°C for at least 1.5 h.

EFFECT: avoidance of use of fluxes; reduced number of operations at concentrate activation stage; reduced amount of waste cake.

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