Leaching experiments of As species from gold-mine tailings
Batch leaching experiments were performed on gold mine tailings from the Jinfeng Mine, Dandong, NE China. As-bearing minerals were characterized by XPS. The results demonstrate that As is present as As2O3. In leaching experiments with deionized water, As in the leaching solution declined with time from 254 μg/L to 160 μg/L during 7 days, but increased after 7 days. Although As(Ⅲ) was stable after two days and 15％ oxidized after the 4th day, As(Ⅴ) was the predominate species after 7 days. The leachates have strong buffer capacity because of the carbonate-bicarbonate matrix used to process ores at the mine. There is no obvious change in As concentration from leaching when pH changes from 4 to 8. Total As increases from 59 μg/L to 200 μg/L when pH goes up from 2.0 to 10.0. Alkaline conditions favor leaching of As.
X.M.Luo B.X.Xu L.Q.Zhao
School of Marine Sciences, China University of Geosciences, Beijing, China Civil and Environment Engineering Department, East-China Institute of Technology, Fuzhou, China Beijing Key Laboratory of Water Resources Environmental Engineering,China University of Geosciences,
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1093-1095
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）