New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA; Kjeøy Research and Education Center, Vestbygd 8412, Norway.
New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA; Kjeøy Research and Education Center, Vestbygd 8412, Norway.
Mar Pollut Bull. 2018 Dec;137:582-592. doi: 10.1016/j.marpolbul.2018.11.012. Epub 2018 Nov 12.
Metal release from the deposition of sulfide-containing tailings in seawater was investigated using a batch reaction experiment inside a temperature and dissolved oxygen-controlled chamber. Two hundred grams of tailings from a porphyry Cu-Au and a sediment-hosted Cu deposit were submerged in 1.8 L synthetic seawater. The sulfides present in the porphyry Cu-Au tailings are pyrite (FeS), chalcopyrite (CuFeS) and bornite (CuFeS) while in the sediment-hosted Cu tailings are bornite, chalcocite (CuS) and covellite (CuS). Galena occurs as a minor sulfide in both tailings. Pore water and overlying seawater samples were collected and analyzed for pH, redox potential and trace metals (Cu, Pb and Fe) concentration. Results show that there is very low Cu (10-40 μg/L), Pb (1-10 μg/L) and Fe (5-50 μg/L) released into solution throughout the course of 87 days. Long-term trace metal release from tailings in seawater is therefore theorized to be low and is a slow process.
采用温度和溶解氧可控室内批量反应实验，研究了含硫化物尾矿在海水中的金属释放情况。将 200 克斑岩型铜金和沉积型铜矿床尾矿浸入 1.8L 合成海水中。斑岩型铜金尾矿中的硫化物为黄铁矿（FeS）、黄铜矿（CuFeS）和斑铜矿（CuFeS），而沉积型铜尾矿中的硫化物为斑铜矿、辉铜矿（CuS）和铜蓝（CuS）。方铅矿在两种尾矿中均为次要硫化物。采集了孔隙水和上层海水样品，并对 pH 值、氧化还原电位和痕量金属（Cu、Pb 和 Fe）浓度进行了分析。结果表明，在 87 天的时间内，仅有少量 Cu（10-40μg/L）、Pb（1-10μg/L）和 Fe（5-50μg/L）释放到溶液中。因此，理论上认为尾矿在海水中的痕量金属长期释放量较低，且是一个缓慢的过程。
