Alumina process recovers gas and water

摘要

Rising plumes of vapour are a sign ofrna working alumina refinery. The flue gas is generated by the calcination process that converts gibbsite into alumina. For each tonne of smelting-grade alumina, the calciners produce 1.2t-1.4t of gas. Normally, it is treated to remove alumina dust and is then vented into the atmosphere.rnBut Alcoa World Alumina has developed a way of recovering some of the energy in the flue gas. Peter Hay from the company's technology delivery group at the Kwinana refinery in WA described the technique in a paper presented at the Chemeca conference in Perth in September.