calcium aluminate clinker is produced by burning the raw materials of high grade crude aluminous bauxite and limestone in arc-furnace kiln. it is mainly used in refining ladle to remove the sulfide impurities from steel liquid and keeping good fluidity of slag. specifications first type: chemical composition : size (mm) 0-25mm/0-30mm cao: 49-54% al2o3:40-45% sio2: 4.5%max specifications second type:chemical composition : size (mm) 0-25mm/0-30mm cao: 34-40% al2o3:49-55% sio2: 6%max we have strict control about company & quality;our service is full-around and first-class. so we¡¯re you wise choice.don¡¯t hesitate to contact us. contact person: ms. liang xiaofei(sales manager) helen(at)rs-abrasive.com tel:+86 379 65285888-0 13015581246 fax:+86 379 66285889