为了确定含金石英矿石中各种矿物在矿石自磨过程中的变化特性,某选金厂曾用MБ50×18型圆筒磨矿机对六个不同矿床的含金石英矿石的自磨过程作了研究.矿石中的石英含量为43～70%,嵌布有不同粒度的自然金(可达75%)和含金硫化物.含金石英脉的围岩有长石、碳酸盐和泥质矿物,它们中实际上不含金和银(见表1). In order to determine the characteristics of various minerals in the gold-bearing quartz ore during the process of ore self-abrasion, a certain gold miner once used the MБ50 × 18 cylindrical grinding machine to self-mill the gold-bearing quartz ores in six different deposits The quartz in the ore contains 43-70% of quartz, embedded with natural gold of different grain sizes (up to 75%) and gold-bearing sulphides. The surrounding rocks of gold-bearing quartz veins include feldspar, carbonate and mud The minerals, which are practically free of gold and silver (see Table 1).