How is aluminium ingot produced?
1, electrolytic aluminum production process: bauxite - alumina - electrolytic aluminum.2, in accordance with the main component content of aluminum ingot can be divided into three categories: advanced pure aluminum (aluminum content of 99.93-99.999), industrial high-purity aluminum (aluminum content of 99.85-99.90), industrial pure aluminum (aluminum content of 98.0-99.7).
Aluminum electrolysis can be divided into three types: side inserted anode rod, self baking cell, inserted anode rod, self baking cell and prebaked anode tank. Since the production of electrolytic aluminum baking tank has the characteristics of simple equipment technology, short construction period, less investment, but not the flue gas treatment, serious environmental pollution, mechanical difficulties, high labor intensity, is not easy to scale, single low yield, such as not easy to overcome the shortcomings of the production process is being phased out. At present, most countries in the world and production enterprises are using prebakedanodecells, the strength of the current slot has reached more than 350KA, not only a high degree of automation, low energy consumption, single high yield, but also meet the requirements of environmental protection regulations.
There are mainly three types of bauxite for the production of alumina: gibbsite, diaspore and diaspore. 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. Because of the different characteristics of the three kinds of bauxite, different production processes have been adopted in the alumina production enterprises. At present, there are three kinds of Bayer process, the alkali lime sintering method and the Bayer sintering combined method. 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.
The production of aluminum ingot is made up of bauxite mining, alumina production, aluminum electrolysis and other production links.
