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目前在选矿中已经考虑处理含有氰化物可溶的铜矿物(例如辉铜矿、铜蓝、斑铜矿、孔雀石和蓝铜矿)的复杂金矿石。在很多情况下,由于多种原因这类矿石并没有大规模开采,因为这些矿石含有氰化物可溶的铜矿物,从而大幅度降低金的回收率,大幅度提高氰化物的消耗量,以及增加后续处理的成本。并且,尾矿上清液中存在的铜使得可弱酸分解的氰化物稳定,从而对野生动植物产生毒害。在SART法(硫化-酸化-返回-浓缩)中,添加NaHS使与铜氰络合物结合的氰化物释放出来,以沉淀铜,并且在弱酸性条件下将氰化物转化为HCN气体,使其以游离氰化物形式返回到浸出回路中。铜以有价值的高品位(~70%Cu)Cu2S副产品产出。氰化物循环应用,使浸出回路可以在氰化物较高用量下运行,从而提高金的浸出率,降低铜在金电积中的沉积量。第一个商业化的工厂在西澳大利亚Telfer工厂投产。由生物产生的硫化氢气体可以以很低的成本代替化学品硫化物,并且可以降低酸耗量。当生物SART工厂的建设投资比氰化物去毒工厂投资高时,但由前者对铜的回收和氰化物回收产生的效益会在很短的周期内收回投资。BioteQ公司目前与加拿大的Columbia金属公司合作,在北墨西哥的Columbia金项的在SART回路中采用他们发明的生物硫化物产生和沉淀技术。由于矿石中含有氰化物可溶的铜,因而用常规方法处理这两个矿区的矿石存在一些难题。本文综述了BioteQ公司制定的生物SART法的处理技术要点、经济和商业情况以及环境效益。
At present, the processing of complex gold ore containing cyanide-soluble copper minerals such as chalcopyrite, copper blue, bornite, malachite and azurite has been considered in beneficiation. In many cases there have been no large-scale mining of such ores for a variety of reasons because these ores contain cyanide-soluble copper minerals, which can drastically reduce gold recovery rates and dramatically increase cyanide consumption, as well as Increase the cost of follow-up processing. Also, the presence of copper in the tailings supernatant stabilizes the cyanide, which is weakly acid-decomposable, thereby causing toxicity to wildlife. In the SART method (sulfidation-acidification-return-concentration), NaHS is added to liberate cyanide bound to the copper cyanide complex to precipitate copper, and the cyanide is converted to HCN gas under weakly acidic conditions to give Return to the leach circuit as free cyanide. Copper is produced as a valuable high grade (~ 70% Cu) Cu2S by-product. Cyanide recycle allows the leach circuit to operate at higher cyanide dosage rates, increasing the leaching rate of gold and reducing the deposition of copper in the gold electrowinning. The first commercial plant was commissioned at the Telfer plant in Western Australia. Hydrogen sulfide gas produced by the organism can replace the chemical sulfide at a very low cost, and can reduce the acid consumption. While biological SART plants invest more in construction than cyanide detoxification plants, the benefits of copper recovery and cyanide recovery from the former will recover their investment in a short period of time. BioteQ is currently partnering with Columbia Metal in Canada for their biosulfide generation and precipitation technology in the SART circuit at Columbia, Northern Mexico. Due to the cyanide-soluble copper contained in the ore, there are some problems with the conventional methods for treating the ore in both mines. This article summarizes the technical points, economic and business conditions, and environmental benefits that BioteQ has developed for the biological SART method.