在清理铸件用的设备中,如喷砂机、滚筒清理机和转台清理机等,都需用铁砂作清理材料。铁砂虽然也可以用石英砂代替,但是当石英砂以高速度喷至铸件上,大部分被击碎,经常只能使用3—4次,很不经济;如果用铁砂,则可连续使到140~160次之多。这就是说,1吨铁砂可以抵得上35吨石英砂,而费用仅为后者的七分之一。 In cleaning equipment used in casting, such as sandblasting machine, drum cleaning machine and turntable cleaning machines, are required to use iron sand for cleaning materials. Although iron sand can also be replaced by quartz sand, but when the quartz sand sprayed at high speed castings, most of the crushed, often only 3-4 times use, very uneconomical; with iron sand, you can make continuous 140 ~ 160 times as many. This means that 1 ton of iron sand can afford 35 tons of quartz sand at a fraction of the cost of the latter.