Problems to Be Aware of When Running a Wet Ball Mill

The wet ball mill is the key equipment for crushing the material after it has been crushed. Ball mills are widely used in the production of cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal dressings and glass ceramics, dry or wet grinding of various ores and other grindable materials.

The wet ball mill is the key equipment for crushing the materialafter it has been crushed. It consists of the main parts such as the feedingpart, the discharging part, the turning part and the transmission part. Ballmills are widely used in the production of cement, silicate products, newbuilding materials, refractory materials, fertilizers, black and non-ferrousmetal dressings and glass ceramics, dry or wet grinding of various ores andother grindable materials. This article mainly discusses the problems that needto be paid attention to when running the wet ball mill.

First, the wet ball mill should operate at the optimum output(usually the design force) and should not easily change the output. The outputis too small, which not only increases the power consumption of the grindingunit weight limestone, but also reduces the concentration of the productslurry, which does not meet the design requirements, or makes the liquid levelof the first and second-stage recirculation tanks difficult to maintain. If theoutput is too large, the ball mill will be overloaded, the ball mill currentwill increase, the milling effect will be reduced, the level of the first-stagerecirculation tank will rise rapidly and it will be difficult to adjust, thelimestone slurry will become thicker, and the pump and pipeline blockage willeasily occur, the cycle rate increases and the material wear increases. Insevere cases, the ball mill will be blocked or the steel ball will be takenout, which will endanger the safety of the equipment.

Second, the limestone particle size entering the ball mill shouldbe below the designed maximum particle size. Operating experience has shownthat excessive limestone particles can put an extra burden on the ball mill,and individual large limestone particles are not easily broken by the steelball, which will lead to a decrease in the output of the ball mill and anincrease in power consumption. Therefore, the particle size of the limestone onthe feeder should be closely monitored during operation. When the particle sizeexceeds the designed maximum particle size, the feedstock should be reducedimmediately or the feedstock should be stopped, and corresponding measuresshould be taken to ensure the particle size of the feedstock is qualified.

Third, the ball mill should regularly add steel balls to maintainthe optimal ball load of the ball mill. Too few steel balls will affect theoutput of the ball mill. Too many steel balls, the steel ball can not beeffectively lifted by the cylinder, it will also affect the output of the ballmill and increase power consumption. After a period of operation, all steelballs should be selected and replaced with new balls to ensure theeffectiveness of the ball mill.

Fourth, the recirculation pump, pipeline and recirculation tankshould be flushed regularly during operation. The cyclone should also beswitched and flushed regularly to prevent blockage and affect normal operationand product quality.

Fifth, changing the diameter of the underflow nozzle of the secondarycyclone, the ratio of the underflow of the cyclone to the amount of overflowslurry can be adjusted, thereby affecting the concentration, the amount ofwater flowing through the ball mill, and the system circulation rate. Thenozzle size should not be easily adjusted unless there is a major change in thesystem.

Sixth, in the operation, we should pay close attention to theanalysis report of limestone composition, and the mineral content of Fe203 andSiO2 will increase the wear of the steel ball. When the quality of thelimestone changes significantly, the system should be re-adjusted, and theoptimal ball loading and maximum output of the ball mill can be obtainedthrough the test method.

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