About Calcined Bauxite
Calcined bauxite is made by calcining/sintering superior grade bauxite at very high temperatures (1600-1800 degree Celsius). The process of heating up bauxite in rotary kilns removes moisture and allows for the mineral phase corundum and mullite to be formed. Reaching this important refractory phase is what gives calcined bauxite its high alumina and refractoriness, low iron and grain hardness and toughness. These properties earn calcined bauxite the workhorse raw material title in the production of many refractory and abrasive applications.
Calcined Bauxite Applications
High Friction Surface Treatment
Calcined bauxite is the aggregate of choice for HFST because of its abrasive qualities, hardness, and ability to hold frictional resistance over time. It is the only aggregate that has met the threshold for performance necessary to be called an HFST by the U.S. Department of Transportation Federal Highway Administration. GLM’s calcined bauxite for HFST, GRIPgrain®, is quality bauxite (rotary-kiln fired) and sized to state specifications in our modern and quality controlled U.S. sizing plant. Dust collectors on all of GLM’s sizing circuits ensures the finished product is virtually dust-free. GLM packages all GRIPgrain® in quality, durable, spout-bottom 4000 lb bulk bags; rain caps are added to keep material extra dry.