Fired brick belongs to building material, and refractory brick belongs to industrial kiln material. Fired brick is usually used for road surface, sidewalk, landscape engineering, etc. in the residential area, and refractory brick is used for building all kinds of kilns in the workshop, heat insulation in high temperature area, etc. obviously, the use of fired road brick and refractory road brick is different from that of others. Fired road brick should be of strong vacuum extrusion type, Its characteristics: wear-resistant, high compressive strength, non weathering, non decolorization, freeze-thaw resistant brick in the form of water saturation and anti freeze-thaw repeat more than 50 times

The fire-resistant compression pavement brick is not suitable for the application of pavement brick in high-temperature kiln, because it is not frost resistant; it is easy to be weathered, the brick is easy to grow moss, and the service life is short. The composite of cement and clay is used. When the participation of cement and clay is 3%, the fire-resistant spray coating can obtain the strength and spray bonding function suitable for the essential requirements

The use of converging phosphate can reduce the water content of raw materials moderately, but too much participation can easily cause spray collapse of raw materials. The compound of retarder and accelerator can control the surface repair time, the later tough time and the later tough strength of fire-resistant spray coating. When the amount of retarder is 0.3% and the amount of accelerator is 0.02%, the desired spray construction control effect can be achieved

Due to the huge amount of work in the simulation spraying experiment, the feasibility of the simulation spraying experiment can be inferred through the small-scale experiment, and a discussion method of the blast furnace refractory spraying is determined, so as to greatly increase the research and development efficiency of the refractory spraying products