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金刚石是国家稀缺的矿产资源,其价值昂贵,用途广泛。我国原生金刚石矿中,细粒级金刚石(-0.5+0.2毫米)所占比例较大,如计入次生破碎部分,可占岩管储量的10—45％。目前国内外金刚石最小回收粒径为0.5至1.6毫米,我国在矿床评价时要求金刚石最小回收粒径为0.2毫米,虽然将0.5毫米至0.2毫米粒级金刚石作了初步评价,但由于技术、经济等原因,在矿山生产上仍将回收粒径下限定为0.5毫米,这部分金刚石进入尾矿,造成国家稀缺资源的损失。为了充分利用金刚石矿产资源,两年来我们先后对浮选、碱熔、重液等十二种回收细粒级金刚石的方法进行了考查,其中浮选、碱熔、重液分选效果最好。在小型试验、
Diamond is the country’s scarce mineral resources, its value is expensive, widely used. In China’s native diamond mine, fine-grained diamond (-0.5 +0.2 mm) accounts for a large proportion, accounting for 10-45% of the reserves of the rock tube, if included in the secondary crushed part. At present, the minimum recovery diameter of diamond at home and abroad is 0.5 to 1.6 mm. In our country, the minimum recovery diameter of diamond is required to be 0.2 mm. Although the grain size of 0.5 mm to 0.2 mm was initially evaluated, due to the technical, economic, etc. The reason is that in the mine production, the lower limit of the recovery grain size will still be set at 0.5 mm. This portion of diamond enters the tailings, resulting in the loss of the country’s scarce resources. In order to make full use of diamond mineral resources, in the past two years, we have investigated twelve methods of recovering fines, such as flotation, alkali melting and heavy liquid, among which flotation, alkali fusion and heavy liquid separation are the best. In small trials,