球磨仪研磨硫磺粉的静电作用

Electrostatic effect of sulfur powder grinding by ball mill

采用高频振动球磨仪研磨硫磺,对研磨过程中硫磺粉的起电特性进行测试和分析。结果表明:控制研磨转速分别为1 200、1 500、1 800 r/min时,薄片状硫磺带静电量到达饱和值的时间为40、60、100 s,荷质比增大速率为0.269、0.470、0.700 nC/(g·s),粉状硫磺所带静电量到达饱和值的时间分别为30、40、70 s,荷质比增大速率为0.416、0.701、0.979 nC/(g·s);采用碳化钨材质的研磨体,研磨后的硫磺粉所带静电量最小,不锈钢研磨材质的是碳化钨的1.39倍,氧化锆研磨材质的是碳化钨的3.82倍;增大硫磺粉的湿基含水量能够有效减小研磨过程中硫磺粉所带的静电量,当湿基含水量为0.8%时,研磨硫磺粉的饱和静电量几乎减小为0。

The electrical characteristics characteristics of sulfur powder in the grinding process were tested and analyzed by employing small-sized ball grinder of high-frequency vibration to grind the sulfur. The results show that when the grinding speed is controlled at 1 200, 1 500 and 1 800 r/min, respectively, the time for the static electricity amount of sulfur flake to become saturation value is 40 , 60 and 100 s, with the rising ratio of charge-to-mass ratio being 0.269, 0.470 and 0.700 nC/（g ·s）. The time for the static electricity amount of powder sulfur to become saturation value is 30, 40 and 70 s, with the rising ratio of charge-to-mass ratio being 0.416, 0.701 and 0.979 nC/（g·s）. The amount of static electricity of sulfur powder ground by grinding media made from tungsten carbide is the lowest. The static electricity caused by stainless steel material is 1.39 times that by tungsten carbide. The static electricity caused by zirconia is 3.82 times that by tungsten carbide. The augmented wet-basis water content of sulfur powder can effectively reduce the static electricity amount on sulfur powder in the process of grinding. When the wet-basis water content is 0.8%, the saturated static electricity amount when the sulfur powder is ground is reduced to as low as nearly 0.