Preparation of Magnesia Insulation Materials by Walnut Shell Powder Impregnated with Silica Sol  

作　　者：JIAO Changfa LI Guohua KANG Chi 

机构地区：[1]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China

出　　处：《China's Refractories》2022年第3期34-37,共4页中国耐火材料（英文版）

摘　　要：In order to reduce the thermal energy loss of high temperature kilns and furnaces and lower the surface temperature of the kiln body,magnesia insulation materials were prepared using self-made magnesia porous aggregates(using high purity magnesia powder as starting material and potassium oleate as the foaming agent),middle grade magnesia powder,calcium aluminate cement,and SiO_(2) micropowder as starting materials,introducing walnut shell powder impregnated with silica sol(short for Sws)as a pore-forming agent.The effects of the Sws addition(0,10%,15%,and 20%,by mass)and the sintering temperature(1300,1350,1400,and 1480℃)on the properties of magnesia insulation materials were studied.The results show that(1)for the specimens fired at 1480℃,when the Sws addition is 10%,the cold compressive strength is 22 MPa;when the Sws addition is 20%,the thermal conductivity is 0.368 W·m^(-1)·K^(-1)(350℃);(2)nano-silica in the silica sol reacts with MgO in the matrix to form forsterite,which encapsulates the pores volatilized from the walnut shell powder and forms closed pores.

关 键 词：foaming method ignition loss method walnut shell powder impregnated with silica sol magnesia porous aggregates magnesia insulation materials 

分 类 号：TQ175.713[化学工程—硅酸盐工业]