Refractory Raw Materials for Global Industry

Tabular alumina is a fully sintered, densified alpha alumina produced above 1800 °C without additives. Its coarse hexagonal crystals, very low porosity, outstanding refractoriness and excellent thermal-shock resistance make it the first-choice aggregate for high-performance shaped and monolithic refractories.

Calcined alumina is produced by calcining alumina at controlled temperatures to convert it into the stable alpha phase (5–100 %). With high purity, high thermal conductivity and refractoriness, dimensional stability and excellent abrasion resistance, it is supplied in a range of grain sizes and soda contents.

Reactive alumina has a very fine particle size and high specific surface area, acting as the matrix component of shaped and unshaped refractories. Low open porosity, excellent sintering reactivity, high purity and reduced water demand optimise the performance of low-cement and cement-free castables.

Calcined bauxite is produced by calcining low-iron, low-alkali bauxite at 1600–1800 °C, forming the refractory phases corundum and mullite. With low thermal expansion, excellent creep resistance and good chemical stability, it is among the most important raw materials for refractories in steel, foundry, glass and cement.

High-density alumina grinding media with a hard, smooth surface and very low wear rate. Because they abrade far less than steel or flint media, they grind ceramic bodies and glazes without discolouring or contaminating the batch.

Flake graphite provides excellent thermal conductivity, natural lubricity and outstanding non-wetting behaviour against molten slag and metal. It is the essential carbon source in magnesia-carbon and alumina-carbon refractories, sharply improving thermal-shock and corrosion resistance.