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首页> 外文会议>32nd Annual Hydrometallurgy Meeting and International Conference on the Practice and Theory of Chloride/Metal Interaction, Vol.1 Oct 19-23, 2002 Montreal, Quebec, Canada >Chloride Leaching for Silver, Copper, Lead and Antimony - Industrial Experience in the 600 tonne/day Itos, Bolivia, Plant -
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Chloride Leaching for Silver, Copper, Lead and Antimony - Industrial Experience in the 600 tonne/day Itos, Bolivia, Plant -

机译：银，铜，铅和锑的氯浸出-玻利维亚工厂Itos 600吨/日的工业经验-

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摘要

The Itos Plant, located in Oruro, Bolivia, treats 600 tonnes per day of low grade silver ore (220 grams per tonne) using a hot agitated chloride leach process. The leach solution contains 200 grams per litre sodium chloride, 10 grams per litre ferric iron and 10 grams per litre hydrochloric acid. A bulk metal precipitate is recovered by iron precipitation. The precipitate is smelted, then cupelled to produce a 95 wt.% silver dore bar. The plant has processed nearly 600,000 tonnes of ore since start-up in 1996. A Hargreaves Process hydrochloric acid plant was built in 1999, which resulted in a cost reduction of US$2.70 per tonne of ore treated (up to that time, acid had been imported from Peru). By late 2000, when operations were suspended due to low metal prices, costs had decreased to about US$27.00 per tonne and overall silver recovery was 65%. Itos is still in the "development" mode. Planned modifications include switching from chlorine to air oxidation, and installation of facilities for producing marketable-grade lead metal, antimony trioxide, and sodium sulphate. With these modifications, silver recovery will increase to 80% and costs will drop to US$22.00 per tonne (US$3.20 per ounce of silver with by-product credits).
机译：位于玻利维亚奥鲁罗的Itos工厂采用热搅拌式氯化浸出工艺，每天处理600吨低品位银矿石（每吨220克）。浸出溶液包含每升氯化钠200克，每升三价铁10克和每升盐酸10克。大块金属沉淀物通过铁沉淀回收。将沉淀物熔炼，然后进行杯状生产以生产95 wt。％的银锭。自1996年投产以来，该厂已加工了近60万吨矿石。1999年建了Hargreaves Process盐酸厂，这使每吨矿石的成本降低了2.70美元（到那时为止，酸从秘鲁进口）。到2000年底，由于金属价格低廉而暂停运营时，成本已降至每吨约27.00美元，白银的总体回收率为65％。 Itos仍处于“开发”模式。计划中的修改包括从氯氧化改为空气氧化，以及安装生产可销售级铅金属，三氧化二锑和硫酸钠的设施。通过这些修改，白银的回收率将提高到80％，成本将降至每吨22.00美元（每盎司含副产品信用的白银为3.20美元）。

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