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.
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。
3
The finish of the hand is achieved by electroplating involving several stages: leaching, degreasing, pre-nickelplating and nickelplating, along with numerous rinses.