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我矿选矿厂选矿流程中,磁选机选出的精矿要经过斜面筛分级,粗粒精矿用4PN砂泵返回磨机再磨。由于再磨精矿粒度大、硬度高、浓度高,对砂泵磨损极大,价值近300元的附叶轮减压装置的使用寿命最长也只有7天,且漏浆严重。不仅造成大量浪费,且工人劳动强度大,工作环境差。多年来我矿采用过铸铁、铸钢、不锈钢等不同材质的减压装置配件。试用过附叶轮、填料盒等封闭形式效果都甚微。1990年我们采用了附叶轮加水
In the beneficiation process of mine concentrator, the concentrates selected by the magnetic separator go through the bevel sieve grading, and the coarse-grained concentrate is returned to the mill and reground with 4PN sand pump. As the re-grinding concentrate particle size, high hardness, high concentration, great wear on the sand pump, worth nearly 300 yuan attached to the longest lifespan of the impeller decompression device is only 7 days, and leakage of serious. Not only caused a lot of waste, and workers labor-intensive, poor working environment. Over the years I used cast iron, cast steel, stainless steel and other materials decompression device accessories. Trial attached impeller, packing boxes and other closed forms are very little effect. In 1990 we used the impeller plus water