前言从矿石中溶出金银的方法有用氯气、汞、王水等种种方法,但在工业上提取金银,近九十年来,氰化提取法占最重要地位的状况至今仍没有改变。然而氰化法存在金银溶解速度慢、易受其他共存金属影响的缺点,特别是氰化物是剧毒性物质,从世界上对环境污染极为关注的观点来看,乃是此法的最大缺点。 Preface The method of dissolving gold and silver from ore has many methods such as chlorine, mercury and aqua regia. However, the extraction of gold and silver in industry has not changed till now in the most important status in the past 90 years. However, the cyanide method has the disadvantages of slow dissolving of gold and silver and being easily influenced by other coexisting metals. Cyanide, in particular, is a highly toxic substance. It is the biggest disadvantage of this method from the point of view that the world is greatly concerned about environmental pollution .