One of the most robust refractories is alumina, which consists of aluminum oxide and traces of other materials. Alumina is highly stable chemically and has superior hardness, strength and spalling resistance. Refractory suppliers manufacture alumina that is suitable for lining furnaces operating at temperatures up to 3350 degrees Fahrenheit.
Established in 1999, Great Lakes Minerals (GLM) is a leading processor of alumina-based refractory materials, including calcined bauxite. This is a strong and highly durable material. We are well known for the high quality of our products, ensuring that our quality assurance process starts at the raw materials supply stage. China and Guyana are our two main markets for calcined bauxite.
Our calcined bauxite products have high alumina and low iron content, making them ideal refractory materials. We use our state-of-the-art crushing and sizing technology to supply customers with the highest quality sized calcined bauxite and brown fused alumina. Quality is of the utmost importance and we are constantly aware that any deviation from our high standards could have major implications for refractory lining stability.
GLM is a supplier of several refractory-grade calcined bauxite materials, ranging in size from 25mm to -325 mesh flours:
- GLM RD-88. This uniformly-fired Chinese bauxite has a high density, with a minimum alumina content of 87 percent.
- GLM-90. This Chinese bauxite contains 88 percent alumina. It is a high density product with a BD of 3.35 g/cc.
- RASC. Our Refractory “A” Grade Super Calcined (RASC) bauxite is sourced from Guyana and is universally considered the most “refractory” bauxite available in the world. High in alumina, this material is very low in impurities.
We also produce a brown fused alumina product, BFA-96. This has a high alumina and low iron content with low magnetic properties. It is processed in an electric arc furnace, giving it excellent hardness, strength and durability. Its thermal properties make it an excellent choice for many refractory applications.