Kim Myoung-Jin, Ahn Kyu-Hong, Jung Yejin
Future Technology Research Division, Korea Institute of Science and Technology, Cheongryang, Seoul.
Chemosphere. 2002 Oct;49(3):307-12. doi: 10.1016/s0045-6535(02)00307-7.
The main objective of the present study is to determine arsenic species in mine tailings by applying an ion exchange method. Three abandoned mines, Jingok, Cheonbo and Sino mines in Korea, which had produced mainly gold, were selected for the collection and analysis of the tailings. It was found that the arsenic speciation using an ion exchange method was effective to separate As(III) and As(V) in leachate of mine tailings. The concentration of As(V) was found to be 63-99% in the leachate, indicating that As(V) would be the major arsenic species in the mine tailings and the tailings were under oxic conditions. The total concentrations of arsenic and metal elements in the mine tailings were up to 62,350 mg/kg As, 40 wt.% Fe, 21,400 mg/kg Mn, and 7,850 mg/kg Al. Sulfate was the dominant anion throughout the leachate, reaching a maximum dissolved concentration of 734 mg/l. The results of XRD and SEM in the mine tailings showed that main arsenic-containing minerals were pyrite (FeS2) and arsenopyrite (FeAsS) which would be the source of arsenic contamination in the study area.
本研究的主要目的是通过应用离子交换法测定尾矿中的砷形态。选取了韩国的三个废弃矿山——金谷矿、天浦矿和新丰矿，这些矿山主要生产黄金，对其尾矿进行采集和分析。结果发现，采用离子交换法进行砷形态分析能够有效分离尾矿浸出液中的As(III)和As(V)。浸出液中As(V)的浓度为63 - 99%，这表明As(V)是尾矿中主要的砷形态，且尾矿处于有氧条件下。尾矿中砷和金属元素的总浓度分别高达62350 mg/kg As、40 wt.% Fe、21400 mg/kg Mn和7850 mg/kg Al。整个浸出液中硫酸根是主要阴离子，最大溶解浓度达到734 mg/l。尾矿的XRD和SEM结果表明，主要含砷矿物为黄铁矿(FeS₂)和毒砂(FeAsS)，它们是研究区域砷污染的来源。
