Metallurgical Grade Bauxite composition offered by us : A12O3 more than 44% and up to 55% and SiO2 4% (max.). Bauxite should have A12O3 40% SiO2 5% and Fe2O3 30 – 40% bauxite for use in cement industry. In the steel industry metallurgical grade bauxite is used as a flux as partial replacement of fluorspar.If monohydrate, high temperature and higher concentration of soda is necessary while the trihydrate variety is digested at low temperature and lower concentrates.