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    • 5. 发明授权
    • Recovery of cyanide from precious metal tailings
    • 从贵金属尾矿回收氰化物
    • US5364605A
    • 1994-11-15
    • US710479
    • 1991-06-05
    • Henry A. PfefferGary E. Wolfe
    • Henry A. PfefferGary E. Wolfe
    • C02F1/20C02F1/72C02F9/00C01C3/00
    • C02F1/722C02F1/20C02F2101/18Y10S210/904
    • Process for recovering cyanide values from a mill tailings stream remaining after gold and silver have been leached from an ore, by treating the tailings stream containing both ore insolubles and remaining cyanide leachant, without a preliminary filtration, to acidification with an acid to a pH of at least 4, stripping the cyanide values therefrom with a stripping gas in a stripping column such as a baffle plate column wherein the average residence time of the column is sufficiently low that the pH of the stream does not rise above about 4 and the ore insolubles do not plug the column, introducing the stripping gas and stripped cyanide values into an absorbing column containing an alkaline liquor to absorb the cyanide values, recovering the absorbed cyanide values, and removing a stripped tailings stream reduced in cyanide values.
    • 通过在不经过初步过滤的条件下处理含有矿物质不溶物和剩余的氰化物浸出剂的尾矿物料,用酸回收至酸的酸化后,从矿石中浸出金和银之后剩余的磨尾矿料流中回收氰化物值, 至少4,在汽提塔如挡板塔中用汽提气汽提出氰化物值,其中塔的平均停留时间足够低,使得流的pH不升高到约4以上,而矿石不溶物 不要塞柱,将汽提气体和汽提的氰化物值引入到含有碱性液体的吸收塔中以吸收氰化物的值,回收吸收的氰化物的值,以及除去氰化物的减少的汽提尾矿流。