... :2000 Certificate factory for refractory and ceramic products best quality&cheap Calcined Alumina It adopts high ... quality indutrial Al2O3 as raw materials ,then calcined by 1400-1600 celsius degree, then crushed, ... refractory materials, like producing refractory bricks,castable.etcpolishing, like polishing marble, granite,stainless steel, etc.doing ceramic products, etc. calcined alumina (refractory ...