high-grade bauxite (al2o3>76%)and high-quality soft burning powdered magnesium (mgo>95%)are used as initial reagents for the synthesis of magnesia alumina spinel.the starting materials are performed by the multistage refinement and the sintered in the ultra-temperature tunnel furnace at 1800¡æ to get our products.our products have the higher content of the mineral facies phase,high bulk density ,the homogeneous structure ,stable mass,the good corrosion resistant and resistance to abrasion and the best resistance to thermal shock.so it is the optimum raw materials in the magnesia alumina spine brick which is used as the hot zone of the rotary furnace producing cement,ladle brick ,ladle pouring materials and so on. 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