Henan Hongji Mine Machinery Co., Ltd has produced theball mill with belt dryer manufacturers, environmental protection, safety, low noise, easy to maintain stable structure, etc. Even so, the operation of the coal slime ball mill still have a lot problems to pay attention.The improper operation is also the common phenomenon so that the existence of the wall of the coal. When it is plugging coal or full coal, air circulation section reduces or is blocked lead to steel ball buried in coal ,almost lose ground coal role.Its common feature is: coal gangue broken machine Lord motor ammeter instructions is droping;It vomit big ore,pulp is out; this phenomenon that Shale crusher grade machine overflow "rough running is serious, return sand amount increased obviously; Coal gangue crusher ball mill run voice depressing, the steel ball of sound almost is not heared. This phenomenongenerally is the result of rotary dryer machine. Because certain specification and type of ball mill in certain grinding conditions, only allow certain the ability through . When the crude ore properties change, or increase the amount of ore or coarse grained ore larger than return , itself ability is outnumber , so it can appear plugging coal problem. Moreover, improper operation can also cause problems of coal wall. Coal cinder crusher : if we don't master ground water proper to directly influent the ground pulp density, and grinding excessive concentrations may cause plugging coal problem. And the total amount of grinding medium or the unreasonable ball size ratio unreasonable can also cause plugging coal problem.Facing this phenomenon, first we must analysis the changes of ore properties .Is normal ore amount, water amount, the return of sand amount, overflow particle size ? find out the problem, "suit the remedy to the case".(1) reducing ore amount of fluidized bed dryer or a short time to stop ,slime dryer can reduce load which ball millwork,and the ore amount which the ball grinding machine is through .(2) adjusting water consumption ground pulp density: we must strictly control the density, too big or too small will has bad impact. When concentration is high, the pulp flow speed is slow, and grinding medium impact becomes weak. Relative to the overflow type ball mill, ore size of the row coarsens, but the grid ball millmay appear "bulging belly" phenomenon.(3) coal ganguecrusher , we must reasonably add grinding medium if grinding machine within the medium load is not enough, we should fill appropriately to increase the size of the grinding medium.