Novel multi-stage aluminium production: part 2–experimental investigation on carbosulphidation of Al<inf>2</inf>O<inf>3</inf>using H<inf>2</inf>S and sodiothermic reduction of Al<inf>2</inf>S<inf>3</inf>
MetadataShow full item record
© 2016 Institute of Materials, Minerals and Mining and The AusIMM. In this paper, experimental investigation on the carbosulphidation of alumina (Al 2 O 3 ) for aluminium (Al) production and the sodiothermic reduction of aluminium sulphide (Al 2 S 3 ) are presented. Hydrogen sulphide (H 2 S) was used as a reductant and source of sulphur. This work is the second of two-parts paper series. The experimental investigations of the Stage-1 process (Al 2 O 3 carbosulphidation) were carried out at 1100–1600°C using a laboratory scale horizontal tube resistance-furnace. H 2 S gas, diluted with argon (5% H 2 S and 95% Ar), was reacted with pellets of a mixture of ?-Al 2 O 3 and C powders (1:6 molar ratio) to produce Al 2 S 3 . The effects of gas injection rate, pelletizing pressure, temperature and reaction time on the conversion of Al 2 O 3 to Al 2 S 3 were investigated. The X-ray diffraction results confirmed the formation of Al 2 S 3 (s) in the reaction product above 1400°C. The conversion of Al 2 O 3 to Al2S3 was found to be 99.5% at 1600°C and 12 h. The kinetics analysis of alumina sulphidation using Ginstling-Brounshtein diffusion model suggested the overall reaction was controlled by the diffusion of H 2 S gas through the reaction product (liquid Al 2 S 3 ). The activation energy of the alumina sulphidation reaction was calculated to be 148.5 kJ mol -1 . It has also been demonstrated in this study that Al can be extracted from Al 2 S 3 by sodiothermic reduction using Na or NaH. In the case of Na, a level of Al conversion of 75% has been observed for reaction at 290°C.
Showing items related by title, author, creator and subject.
Formation and characteristics of glucose oligomers during the hydrolysis of cellulose in hot-compressed waterYu, Yun (2009)Energy production from fossil fuels results in significant carbon dioxide emission, which is a key contributor to global warming and the problems related to climate change. Biomass is recognized as an important part of ...
Catalytic partial oxidation of propylene to acrolein: the catalyst structure, reaction mechanisms and kineticsFansuri, Hamzah (2005)Bismuth molybdates have long been known as active catalysts for selective oxidation of olefins. There are several phases of bismuth molybdates but only three of them are known to be active for partial oxidation of propylene ...
Sandison, Carolyn M. (2001)The importance of organic sulphur fixation in the preservation of organic matter in humic coal-forming environments is demonstrated in this thesis. The transgression of coal depositional systems by marine waters during ...