Views: 261 Author: seppe Publish Time: 2018-04-11 Origin: seppe
Corundum, or alpha alumina, is the most thermodynamically stable form of alumina. In fact the term corundum is generally applied when the alpha alumina has been produced by a fusion process. The alumina source is melted, typically in an electric-arc furnace, then slow-cooled, with the objective of forming an alumina single crystal on a macroscopic scale.
Typically, alumina based raw materials are melted in a triphased electric arc furnace with a pivoting base. For white fused alumina the raw material is calcined alumina. However, for the production of brown corundum, bauxite and recycled products of white and brown corundum are melted, and also reduced using coke. This reduction fusion, generates a co-product: titanium ferrosilicon. It’s important to know how to deal with this to optimise the operation of the furnace and the quality of the production. To operate the arc furnace it is important to respect the following points:
to adapt the chemical composition of the melt to the specifications of the targeted product;
to adapt the electrical adjustments (power, voltage) to the targeted product and to the composition of the melt;
to adapt the flow and the spatial distribution of the products in the furnace to the injected electric power;
to seek chemical and electrical stability of the furnace
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