Synthetic mullite, also classified as an aluminium silicate, is formed by melting alumina and silica, bauxite, and kaolin or alumina, kaolin, and kyanite, depending on the type of synthetic mullite desired. These materials are either sintered in rotary, periodic, or tunnel kilns, or fused in an electric arc furnace. ... Synthetic mullite, made by sintering and by electric arc fusion, is produced by Mulcoa (Mullite Company of America) in Andersonville, GA, and by Washington Mills Electro Minerals Corporation in Niagara Falls, NY.
Magnesium oxide produced by calcination of magnesium carbonate and arc fusion, taking the form of irregular granules ranging from colourless through yellowish to greyish brown. The granules consist of translucent to transparent crystalline particles of approximately 1 to 10 mm in size. ... Classification in this subheading is determined by the manufacturing process, calcination and electric arc fusion at a temperature of 2800 to 3000 °C, as indicated in the CN explanatory notes, subheading 2519 90 10, point 2.
Magnesium oxide produced by calcination of magnesium carbonate and arc fusion, taking the form of irregular granules ranging from colourless through yellowish to greyish brown. The granules consist of translucent to transparent crystalline particles of approximately 1 to 10 mm in size. ... Classification in this subheading is determined by the manufacturing process, calcination and electric arc fusion at a temperature of 2800 to 3000 °C, as indicated in the CN explanatory notes, subheading 2519 90 10, point 2.
