| 摘要 |
A carbothermic reduction process for extracting commercially pure aluminum from sources of alumina containing substantial amounts of compounds of elements in the group comprising iron, silicon and titanium is disclosed. The method involves selective reduction of alumina-bearing ores with coal, or other impure sources of carbon containing oxides of elements other than aluminum, to produce a molten slag containing alumina and diminished levels of the impurity oxides, followed by removal of trace impurities from the slag and then recovery of commercially pure aluminum by reaction with substantially pure, carbon, or aluminum carbide derived therefrom, in electrically heated furnaces.
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