Production process of aluminium ingot
Because of the different characteristics of the three kinds of bauxite, different production processes have been adopted in the alumina production enterprises, including Bayer process, alkali lime sintering method and Bayer sintering combined method, three kinds. High grade bauxite is usually produced by Bayer process, and medium or low grade bauxite is produced by combined method or sintering method. Because of its simple process and low energy consumption, Bayer process has become the most important method in the production of alumina at present, and the output is about 95% of the total alumina production.
In the world has proven reserves of bauxite, 92% is weathering lateritic bauxite, belonging to gibbsite type bauxite. The characteristics of these is low silicon, high iron and high silicon aluminum ratio, concentrated in West Africa, Oceania and central and South america. The remaining 8% are sedimentary type bauxite, belong to diaspore and diaspore type, low grade, mainly in Greece, the former Yugoslavia and Hungary and other places.
The production of aluminum ingot is made up of bauxite mining, alumina production, aluminum electrolysis and other production links.First a bauxite mining, water washing, grinding and other processes to produce aluminum powder, alumina roasting by complex processes such as four by bauxite alumina production, there are three main types: gibbsite and diaspore, boehmite.
