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从本世纪初至今,一直是采用氰化法回收金银。多数金矿的主要脉石为硅酸盐和碳酸盐,这些脉石对氰化物稀释液呈惰性反应,在氰化过程中,对金的溶解或氰化物的消耗不产生任何影响。这些矿物的金溶液通常采用 Elsner 的反应式:4Au+8NaCN+O_2+2H_2O=4NaAu(CN)_2+4NaOH多数金矿石是按上述反应式进行,其金的回收率可达90—98%。某些金矿中,最有害的一种成分,是以活性石墨形式出现的碳质矿物。当石墨与溶
Since the beginning of this century, gold and silver have been recovered by cyanidation. Most of the main gold ores are silicates and carbonates, which react inertly with cyanide dilutions and do not affect gold dissolution or cyanide consumption during cyanidation. The gold solution of these minerals is usually Elsner’s reaction: 4Au + 8NaCN + O 2 + 2H_2O = 4NaAu (CN) _2 + 4NaOH Most gold ore according to the above reaction formula, the gold recovery rate of up to 90-98%. One of the most detrimental components of some gold mines is carbonaceous minerals in the form of activated graphite. When graphite and dissolved