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处理复杂硫化矿时,回收同硫化物共生的贵金属具有重大的经济意义。由于锌-铅-铜矿石中黄铁矿选择性浮选时,与黄铁矿共生的相当一部分金、银进入尾矿。为此,考察了其它的处理方法。矿石先用硫酸铁溶液直接浸出,尔后用浮选法分离悬浮的各种固体组分。这种方法包括:生成硫酸锌溶液;方铅矿转变为不溶性的硫酸铅(PbSO_4)和它在不浮部分连同沉淀的针铁矿(FeOOH)以及其它不溶性脉石矿物中聚积;在可浮部分中分离硫和未溶解的硫化物。对阿拉斯加Delta地区黄铁矿矿床试样进行的试验室研究结果表明,金和银几乎全部富集在可浮部分小。用硫酸铁浸出后,矿石中锌的总回收率达到96.5％到98.5％。在硫酸铁和随后的氯化铁浸出过程中,从矿石中提取的铜约为85％,而且约有6％的铜残留在不浮部分之中以及浸出—浮选阶段混合的部分之中。不浮部分用氯化钙溶液浸出时,铅的提取率达98％到99％。用氯化铁溶液浸出可浮部分时,银的提取率达98％。用氰化物或硫脲浸出可浮部分时,金的提取率达71％到89％。文章叙述了试验室研究的结果。
When dealing with complex sulphide ore, it is of great economic significance to recover precious metals symbiotic with sulphides. Due to the selective flotation of pyrite in zinc-lead-copper ores, a significant proportion of the gold and silver symbiotic with pyrite enters the tailings. To this end, examined the other treatment methods. The ore is first leached with a solution of ferric sulfate, followed by a flotation separation of the various solid components suspended. This method involves the generation of zinc sulphate solution; conversion of galena to insoluble lead sulphate (PbSO 4) and its accumulation in non-buoyant parts together with precipitated goethite (FeOOH) and other insoluble gangue minerals; In the separation of sulfur and undissolved sulfide. A laboratory study of pyrite deposits in the Delta region of Alaska showed that almost all of gold and silver are concentrated in the floatable fraction. After leaching with ferric sulphate, the total recovery of zinc in the ore reached 96.5% to 98.5%. During the leaching of ferric sulphate and subsequent ferric chloride, the copper extracted from the ore is about 85% and about 6% of the copper remains in the non-floating part as well as in the mixed part of the leaching-flotation stage. When the float part is leached with calcium chloride solution, the extraction rate of lead reaches 98% to 99%. Leaching the floatable part with ferric chloride solution, the silver extraction rate of 98%. When leachable from a floatable part with cyanide or thiourea, the extraction rate of gold reaches 71% to 89%. The article describes the results of laboratory research.