The process is acid adding pre-leaching at normal pressure, pressurized oxygen leaching to leach out base metals and filtering separation to obtain solid noble metal concentrate.

其特征在于 采用常压加酸预浸、再加压氧浸出，将羰化合成残渣中的贱金属浸出，过滤分 离得到固体贵金属精矿。

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The pre-treatment of them before conventional cyanide leaching includes roast, chemical oxidation and biological oxidation.

在传统氰化浸出之前进行的预处理过程包括焙烧，化学氧化和生物氧化。

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The finish of the hand is achieved by electroplating involving several stages: leaching, degreasing, pre-nickelplating and nickelplating, along with numerous rinses.

指针的表面电镀需经过下列几道工序：过滤、去油脂、预镀镍、镀镍，之间还穿插了数次清洗。

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