=12px[color=#000000]The rod mill has the same structure as the ball mill. The difference lies in the shape of the grinding medium: one is a steel rod and the other is a steel ball. The stick mill has simple orange, easy operation and reliable operation. It is suitable for rock with various hardnesses. Sand, the product particle size distribution is excellent, as long as the sand selected to the desired fineness modulus is controlled, the sand composition is generally consistent. Generally speaking, the rod grinding mechanism sand has no super-diameter particles and the grain shape is also good. As long as the parameters of the operation are determined to be constant, the fineness modulus of the sand can be stably controlled within ±0.20, and it is possible to reach within ±010.[/color]=12px[color=#000000]The operating parameters of the sand making equipment depend on the following factors, the physical properties of the rock, the grain size of the rock mass, the grinding ratio, the amount of the rod, the ratio of the rod diameter, the slurry concentration and the mill speed.[/color]=12px[color=#000000]When the Robo Sand Crusher rock is selected, the feed size of the rock block is very important and is the fundamental measure to control the product specifications. The rock mass mined in the mine shall be subjected to three-stage crushing and sieving and fed to the rod mill for feeding, and the maximum particle size shall not exceed 25 mm. Because the maximum particle size is too large, the height of the rod and the rod will be raised, causing a large gap, reducing the chance of the fine particles being ground, so that the fine particles are quickly taken away by the water, thereby making the product too coarse and the productivity is lowered. Only for large rod mills with a mill diameter greater than 2500 mm, the feed size can be appropriately increased, such as allowing an increase to Dmax < 30 mm. The economical and optimal feed size is about 10 mm, and the crush ratio change can be adjusted in the range of 2-20.[/color]=12px[color=#000000]The rod grinding mechanism sand is generally produced by wet method. The concentration of the pulp is about 65% (or 60%-75%). The thinner slurry has better fluidity in the mill, which can shorten the residence time of the ore in the mill. Qualified products are discharged in time to avoid over-crushing. Wet sand making can avoid dust flying, and the processing capacity of sand making is about 30% higher than that of dry sand making.[/color]=12px[color=#000000]The rod grinding amount of the rod grinding mechanism and the ratio of the rods are generally made of wear-resistant manganese steel as much as possible, the rod diameter is 40-125 mm, and the rod length is 10-15 mm shorter than the rod mill inner liner. Bars can also be made of high carbon steel (containing 0.8%-1% carbon). The rods must be straight and must be calendered and straightened. The specific gravity of the bar is between 7.7 and 7.9. The density of the rod is 6250-7000 kg/m3. The density of the grading rod is 15%-20% greater than the density of the rod of the same diameter. The filling rate of the rod in the rod mill is about 35%-40%, which is equivalent to the height of the loading is 100-200mm lower than the axis.[/color]=12px[color=#000000]Generally speaking, the rotational speed of the rod mill directly affects the fineness of the artificial sand for construction. For example, when the rod mill speed is 22.5r/min, the fineness modulus FM of the sand is 2.85; if the rotation speed is increased to 26r/min, the fineness modulus FM of the sand is 2.62. It is generally believed that the rotation speed of the rod mill should be lower than the rotation speed of the same size ball mill, mainly considering the fear of loose bars, bent rods or broken rods. Therefore, it is proposed that the actual rotational speed range is 50%-75% of the critical rotational speed, and commonly used is 55%-65%. In the past few years, some metal (tungsten ore) concentrators increased the rotational speed of the rod mill from 65% of the critical speed to 80%-90%. As a result, the mill was operating normally, and the rod rolled in the mill without imaginary confusion. In the case, the productivity is increased and the processing capacity is increased by about 2 times. However, when increasing the rotational speed of the rod mill, the amount of the rod should be reduced accordingly (about 10%), and the ratio of the rods should be adjusted (roughly: the maximum rod diameter is 51%, and the middle rod diameter is 22). %, the minimum bar diameter is about 27%).[/color]=12px[color=#000000]In actual operation, to adjust the product size, gradation and fineness modulus, the simple operation method is to adjust the particle size and feed amount of the feed. The quality and quantity of stable feedstock is a key means of sand making. Therefore, choose a good feeder. At the same time, the crushing and screening of the "three broken" operations should also be well grasped. The second is to adjust the water supply. The pressure of the water supply and the flow meter should be stable and reliable, which is very important for the control of the yield and the amount of stone powder. Sometimes, the addition of trace amounts of surface active substances to the water supply activates the physical-chemical-mechanical mechanism of the occlusion wedge in the rock. The third is to adjust the amount of the load, but it is very troublesome, laborious and time consuming, and the operation is inconvenient.[/color]

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