FREMGANGSM}TE TIL UTVINNING AV ALUMINIUMMETALL OG FERROSILICIUM FRA KYANITTMALM.

摘要

A process for producing aluminum from raw aluminum silicate ore, especially kyanite, including crushing and grinding a natural or raw mined kyanite ore to a desired particle size, beneficiating the ore to form a kyanite concentrate, compacting the concentrate along with a carbon reductant into agglomerates such as briquettes, pellets or other suitable form and to a desired size, carbothermically reducing the ore compacts in an electric arc furnace into an aluminum-silicon alloy, comminuting the aluminum-silicon alloy into a desired particle size, hydroaluminating the aluminum-silicon alloy particles with hydrogen and propylene to form tripropylaluminum and dipropylaluminum hydride, pyrolyzing or decomposing the tripropylaluminum and dipropylaluminum hydride in an oil medium or bath to form an aluminum powder, filtering, washing and drying the aluminum powder, and fluxing and casting the aluminum powder into pigs or other suitable form, thereby forming a substantially pure aluminum product.