Summary: Huazhong Coal Mine analyzed the influencing factors of lining life of rotary kiln and the relationship between curing time and strength. There are many factors that affect the life of lining in rotary kiln operation, mainly in refractory materials, construction quality, welding strength and density of claw nails and so on. Huazhong Coal Mine analyzed the factors affecting the life of rotary kiln lining and the relationship between curing time and strength. There are many factors that affect the life of rotary kiln lining in operation, mainly in refractory materials, construction quality, welding strength and density of claw nails and so on. Among them, three kinds of unshaped refractories are used in the refractories for rotary kiln. The construction quality of refractory in rotary kiln is very important. The amount of water added to each castable has certain requirements. Too much or too little will affect the pouring quality. Whether the stirring is uniform or not, and whether the time from stirring to pouring exceeds the limit will affect the lining of rotary kiln. Different refractories from different producing areas have different textures, which leads to great differences in the service life of the village. Some need to be overhauled once a year, and some can be used for more than two years. In addition, if the refractory is wet and out of date, the service life of the rotary kiln lining will be shortened. The welding strength and density of castable claw nails in rotary kiln can not be ignored. Before lining pouring, claw nails should be welded on the rotary kiln cylinder. The function of claw nail is to make the cylinder and lining firmly connected into a whole and prevent the lining from falling off. Claw nails should be staggered, with a spacing of about 300 mm If the density is too thin, the connection strength between the cylinder and the lining in the rotary kiln will be weakened, and the welding strength of the claw nail will be insufficient, which will also weaken the connection tension between the cylinder and the lining, increase the possibility of the lining falling off and shorten the service life of the rotary kiln lining. In addition, the strength and material of the claw nail itself also affect the lining, and the claw nail should be made of materials with good heat resistance, small thermal expansion coefficient and high strength. The tamping time during pouring is also very important. Short vibration time and insufficient vibration of castable lead to loose lining structure of rotary kiln and short lining life. If the vibration time is too long, the castable will segregate, the surface particles will decrease, and the lining will easily peel off during use, which will affect the lining life. The curing time of castable is also an important factor affecting the lining life. Lightweight thermal insulation materials should be cured for three days, fully drained and strengthened. The longer the curing time, the better.