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. furthermore, our company , henan ruishi special refractory co., ltd. is established according to the modern management in 1993. as one of the main manufacturers and exporters for abrasive, refractory materials and metallurgy industry in china. we have six plants (one fused plant ,three processing factories, one special refractory material plant,one metallurgy material plant,one acid washing and water washing plant, and sales department ).we can produce 80,000 tons annually. our products are main exported italy, france, russia, american, japan, spain ,canada ,korea and so on. 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