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在金伯利岩中,细粒碳元素矿物(金刚石和石墨)非常稀少,其所占数量仅为岩石中的10~(-6)左右,因此要富集这些矿物比较困难。1975年以来,我们开展了从金伯利岩中分选细粒碳元素矿物的研究。经过几年的试验,从金伯利岩中成功地获得了细粒(-0.5+0.1mm)金刚石,纯度为98%,回收率为95%的分选指标。同时,得到了纯度为95%以上的石墨,为金伯利岩中碳元素矿物的研究提供了基础。
In the kimberlite, fine-grained carbon mineral elements (diamond and graphite) are very rare, accounting for only about 10 ~ (-6) in the rock, so it is difficult to enrich these minerals. Since 1975, we have conducted a study on the separation of fine-grained carbon mineral from kimberlite. After several years of experiments, the finely grained (-0.5 + 0.1mm) diamond was successfully obtained from the kimberlite, the separation index was 98% and the recovery was 95%. At the same time, graphite with a purity of more than 95% was obtained, which provided the basis for the study of carbon elemental minerals in kimberlite.