Aluminum shapes, method and reactor for the production of aluminum and aluminum shapes by carbothermic reduction of alumina

摘要

The present invention relates to a process for carbothermic production of aluminum where a molten bath comprising aluminum carbide and aluminum oxide is produced in a low temperature compartment (20), and continuously flows into a high temperature compartment (3) where the aluminum carbide is reacted with alumina to produce a top aluminum layer (31), where the aluminum layer (31) forms a layer on the top of a molten slag layer and is tapped from the high temperature compartment (3) at outlet (5), and where off-gases from the two compartments are treated in reactors (10) fed by one or more columns (9, 19). Also, the present invention relates to a reaction vessel (1) in which are located the low temperature compartment (2) separated from the high temperature compartment (3) by an underflow partition wall (4). The present invention further relates to aluminum shapes such as ingots (62) formed by casting degassed aluminium from which aluminium carbide had been precipitated and filtered.