Silica sol as the main raw material to the silicate refractory fiber, because of its excellent energy-saving and high temperature resistance, is widely used as heat insulation materials and industrial furnaces and other heat, work on the device. Silica sol as binder with other monolithic refractories, because of its low melting point will not be brought into the various oxides, improve performance, and has a mold release high strength, high temperature volume stability, high temperature and good thermal shock resistance . Another treatment of the acid with the silica sol cement or ceramics, can be prepared Nengnai acid chemical equipment, to prevent and withstand high pressure acid Shentou.