Preparation,Properties And The Behavior Of High Temperature Erosion Of CA₆-MA Light-Material

New lightweight and energy conservation refractory was developed to meet the demand of energy conservation and emission reduction. In this research, using rich reserves and low cost dolomite mineral andγ-Al₂O₃ as raw materials, A6/Spinel lightweight and multiphase refractory were prepared by solid phase reaction. The component of calcium and magnesium in dolomite mineral were utilized efficiently. the effect of synthetic temperature and the addition of dolomite as well as two step sintering technological proccess on phase, micro-morphology and the performance at room temperature and high temperature were investigated. Then solid particle erosion behavior at elevated themperature of the material was researched. The result shows that the major phase of the multiphase material is spinel and CA6 as the addition of dolomite is 15-20wt%. The microstructure of CA6 presents mainly laminated structure or platy structure. The optimum sintering temperature is 1600℃ 1650℃. The volume density is 1.61g/cm³ 1.67g/cm³, while the bending strength is 9.52MPa ⁹.68MPa. Using the two-step method, the sintering temperature is higher than one-step method. The volume density and the apparent porosity of the material is close to that of material prepared by one-step method. But the bending strength is higher. The volume of the material is affected significantly by sintering temperature. The refire change rate of the multiphase material is 0.1% and the thermal shock resistance of the multiphase material is the best, while the twice effect of thermal shock bending strength retention is highest when the addition of dolomite is 15-20wt% and the sintering temperature is 1700℃. The volume stability is poor when the material is sintered by two-step method compared to in-situ synthesis. The solid particles erosion behavior results show that the volume erosion rate of the sample is 0.136cm³/g when the temperature is from room temperature to 800℃. When the temperature is from 800 to 1200℃, the volume erosion rate is 0.136cm³/g. The sample erosion-wear is so severe that it can not be used in crisis parts in furnace. With light weight aggregate added in the lightweight brick, CA6/Spinel is prepared, the volume density is 0.97¹.09g/cm³ and the compressive strength is 1.4MPa which is near to high-alumina lightweight brick sell in market.The high properties and new lightweight and energy conservation refractory is prepared. A new technical route for comprehensive and high efficiency of the dolomite mineral was developed.