METHOD OF ALUMINO-CALCAREOUS SLAGS RECEIVING Russian patent published in 2009 - IPC C22B7/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to nonferrous and ferrous metallurgy, particularly to manufacturing of cast iron manufacturing and alumina of low-grade high-sulphur and sideritised raw materials, and also for complex treatment of red sludges of aluminium industry. Alumina-bearing raw materials are molten with reductant and following metal is extracted. After melting outside the furnace into discharged high-aluminous melt it is introduced limestone from the rate of formation in the received sludge twelve-calcium semi-aluminate 12CaO·7Al₂O₃ and calcium orthosilicate 2CaO·SiO₂.

EFFECT: receiving of two complete products - conversion pig iron and alumocalcite sludge, to use low-grade alumina-bearing raw material, to fully treat the letter with simultaneous improvement of engineering-and-economical performance of manufacturing, and essentially decrease energy- and warm consumption.

1 dwg, 1 tbl