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西班牙韦尔瓦省Rio Tinto地区的铁帽,是一种主要由赤铁矿、针铁矿和α—石英组成的氧化矿。它还含有1.5—2.5克/吨的金和50—70克/吨的银。目前,该矿石采用逆流倾析工艺,用氧化物溶液浸出,得到金回收率为80％,但银回收率仅40％。试验研究表明,在氧化作业前先用硫化钠溶液对矿石进行处理,可显著提高银的回收率,而金回收率亦有少量增加。依据不同试验条件,55—77％的银和87—95％的金得以回收。
The iron cap in Rio Tinto, Huelva, Spain, is an oxide ore consisting mainly of hematite, goethite and α-quartz. It also contains 1.5-2.5 g / ton of gold and 50-70 g / ton of silver. At present, the ore by countercurrent decantation process, with oxide solution leaching, gold recovery was 80%, but the silver recovery rate of only 40%. Experimental studies have shown that the treatment of ores with sodium sulfide solution before oxidation treatment can significantly improve the silver recovery rate, while the gold recovery rate also increases slightly. Depending on the test conditions, 55-77% silver and 87-95% gold are recovered.