齐大山铁矿选矿厂的自磨机排矿口为1.6米,其管壁原用10毫米厚钢板卷成,内衬软塑料板,运转三个月全部磨穿,一次消耗软塑料4.5吨,价值1.6万元。于1971年10月,采用100毫米的异型铸石板,运转6个月,普遍磨去20毫米,其中最严重的顶风处一段磨去40毫米,目前还在继续使用。初步判断,磨损严重的一面还能用10个月以上,其他部分可使用16个月以上。 Qi Dashan iron ore processing plant from the mill discharge port is 1.6 meters, the wall with 10 mm thick steel plate originally rolled, lined with soft plastic sheet, all wear three months of operation, a consumption of 4.5 tons of soft plastic, The value of 16,000 yuan. In October 1971, using 100 mm shaped cast stone plate, running for 6 months, the general mill to 20 mm, of which the most serious winds at a wear off to 40 mm, is still continuing to use. Preliminary judgments, serious side wear can also be used more than 10 months, other parts can be used more than 16 months.