Low-temperature synthesis of aluminium carbide

Authors

Jiuqiang Li, University of New South Wales
Guangqing Zhang, University of New South Wales
Dongsheng Liu, University of New South Wales
Oleg Ostrovski, University of New South Wales

RIS ID

53355

Publication Details

Li, J., Zhang, G., Liu, D. & Ostrovski, O. (2011). Low-temperature synthesis of aluminium carbide. Iron and Steel Institute of Japan (ISIJ) International, 51 (6), 870-877.

Abstract

The Hall-Héroult process, the only commercial technology for aluminum production requires high energy and is a major origin of perfluorocarbons and green house gases. A promising alternative process, carbothermal reduction of alumina to metallic aluminum has advantages of lower capital cost, less energy consumption, and lower emission of green house gases. Carbothermal reduction processes under development are based on formation of aluminum carbide-alumina melts at high temperatures. Solid state carbothermal reduction of alumina is possible at reduced CO partial pressure. This paper presents results of experimental study of carbothermal reduction of alumina into aluminum carbide in argon, helium and hydrogen atmospheres at 1500–1700°C. The reduction rate of alumina increased with increasing temperature, and was significantly faster in helium and hydrogen than in argon. Increasing gas flow rate and pellet porosity, and decreasing pressure favour the reduction.