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在含金或银的矿石中还含有其他金属,诸如汞和许多非贵金属。矿石品级愈低,其中的金属杂质含量也愈高,这些杂质必须在提取金或银以前排除掉。汞是最难从氰溶液中排除的一种金属。可它能造成最严重的污染。 本发明的方法包括在含汞的金属氰化物溶液中对新沉淀的金属硫化物,主要是Ag_2S或ZnS进行搅拌,该溶液是在室温和标准气压下对含金和银矿石进行氰化时得到的。其目的在于从溶液中沉淀成不溶的HgS形式的全部汞。对得到的悬浮液进行过滤,
Other metals, such as mercury and many non-precious metals, are also contained in gold or silver containing ores. The lower the ore grade, the higher the metal impurity content, the impurities must be removed before gold or silver is extracted. Mercury is the most difficult to exclude from cyanide solution of a metal. But it can cause the most serious pollution. The method of the present invention comprises agitating newly precipitated metal sulfides, primarily Ag 2 S or ZnS, in a mercury-containing metal cyanide solution obtained by cyaniding gold and silver ores at room temperature and standard pressure of. The purpose is to precipitate from the solution all of the mercury in the form of insoluble HgS. The resulting suspension was filtered,