Patents
The invention describes an improved process for production of high alumina refractory aggregate from sillimanite beach sand. The process involves the mixing of sillimanite, bauxite and synthetic alumina and milling of the mixture. Then it was fired at a temperature range 1500 to 165000. The novel composition helps densification without detoriating high temperature properties. As in this process no synthetic additive is used so it is a cost effective process and very much important for the manufacture of high alumina refractory aggregate. Impurities present in bauxite (TiO2, Fe2O3) act as additive in the high alumina composition. The dense aggregate produced in this process have the high alumina content, in the range of 60-70 N203, and have almost zero porosity and RUL value is 1600 to 164000.