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处理复杂硫化矿时,回收与硫化矿共生的贵金属具有重要的经济效益。在含黄铁矿的锌、铅、铜矿石优先浮选时,因与黄铁矿共生的银和金大部分丢弃在尾矿中,所以还研究了其他的矿石选矿方法。应用硫酸铁溶液直接浸出矿石,然后用浮选方法分离悬浮固体中的各种组分。这种方法的步骤如下:形成硫酸锌溶液;方铅矿(PbS)转化为不溶性的硫酸铅(PbSO_4),与沉淀的针铁矿(FeOOH)以及其他不溶性脉石一起聚集成不可浮的部分;可浮产品中硫与未分解的硫化矿的分离。对阿拉斯加州的黄铁矿矿床Delta矿区的矿石试样进行试验室研究的结果表明,大部分金与银都富集在可浮产品之中。该矿石经硫酸铁浸出后,锌的总回收率达到96.5—98.5％;在硫酸铁和后续的氯化铁浸出过程中,从矿石中回收了约85％的铜。另外,约有6％的铜残留在不可浮产品和浸出-浮选阶段的混合产品之中。使用氯化钙溶液浸出不可浮产品时,铅浸出率为98—99％;氯化铁溶液浸出可浮产品时,银回收率达98％;用氰化物或硫脲浸出可浮产品时,金回收率为71—89％。文章介绍了试验室研究的结果。
When dealing with complex sulphide ore, the recovery of precious metals symbiotic with sulphide ore has important economic benefits. In preferential flotation of pyritic zinc, lead and copper ores, most of the silver and gold symbiotic with pyrite were discarded in the tailings and other ore beneficiation methods were also studied. The ore is directly leached with an iron sulfate solution and the various components in the suspended solid are separated by a flotation method. The steps of this method are as follows: a solution of zinc sulphate is formed; gypsum (PbS) is converted to insoluble lead sulfate (PbSO 4) and together with precipitated goethite (FeOOH) and other insoluble gangues aggregate into non-floatable fractions; Separation of sulfur and undissolved sulphide ore in flotation products. A laboratory study of ore samples from the Delta mine in a pyrite deposit in Alaska shows that most of the gold and silver are enriched in flotage products. After the ore was leached with ferric sulphate, the total recovery of zinc reached 96.5-98.5%; during the leaching of ferric sulphate and subsequent ferric chloride about 85% of the copper was recovered from the ore. In addition, about 6% of the copper remains in the mixed product of non-floatable and leaching-flotation stages. Lead leaching was 98-99% when leaching non-floatable product with calcium chloride solution; silver recovery was 98% when ferric chloride solution leached from leftover product; leaching of flotation products with cyanide or thiourea The recovery rate is 71-89%. The article introduces the results of laboratory research.