METHOD OF PROCESSING ALUMINUM-CONTAINING RAW MATERIAL Russian patent published in 2007 - IPC C01F7/38 C22C33/04 

FIELD: non-ferrous metallurgy; processing aluminum-containing raw material for production of alumina.

SUBSTANCE: proposed method includes preparation of charge from aluminum-containing raw material - nepheline concentrate, iron-containing and alkaline-containing additives and reductant at molar ratio of R₂O/Al₂O₃ equal to 0.95-1.15, where R is alkaline metal in terms of sodium. Then reducing melting is carried out at temperature of 1450-1660°C. After melting, aluminum-containing phase and ferrosilicon are separated by segregation. Aluminum-containing phase is leached-out and aluminate solution thus obtained is processed by carbonization.

EFFECT: reduced power requirements; reduced emissions into surrounding medium.

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