The hydrogeochemical characteristic of different sulfide-containing gangue during leaching

International Conference on Water Resource and Environment 2016

地球科学;生态环境科学

Sun, Y.Q.^1,2 ; Duan, L.^1,2 ; Yao, M.^1 ; Li, W.P.^1

School of Environmental Science and Engineering, Chang'An University, Xi'an

710054, China^1

Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region, Ministry of Education, Xi'an

710054, China^2

关键词: Cation type;    Chemical constituents;    Hydrogeochemical;    Leaching experiments;    Low sulfurs;    Mining areas;    Molar ratio;    PH levels;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/39/1/012032/pdf
DOI  :  10.1088/1755-1315/39/1/012032

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This investigation examined the hydrogeochemical characteristics of different sulfide-containing gangue samples from the Hancheng mining area in Shaanxi, China. The changes in the hydrogeochemical properties during the leaching experiments on gangue samples containing different levels of sulfur (LSG-Low sulfur gangue, MSG-Moderate sulfur gangue and HSG-High sulfur gangue) were investigated by analyzing the major physical and chemical constituents (pH, EC, TDS, Ca2+, Mg2+, Na+, K+, Cl-, SO42-, HCO3-, F-, and Fe). The results indicated that the release of SO42-and H+from the dissolution of sulfide minerals resulted in low Ca2+and HCO3-concentrations at pH levels below 4.7 for the HSG leachate. Also for the HSG samples, the molar ratio of SO42-/Fe exceeded twice that which was expected, meaning the higher SO42-concentrations in the HSG samples result from more than just the oxidation of pyrite. Additionally, the leachate of three sulfide-containing gangue samples exhibited changes in the hydrogeochemical facies with the majority of changes occurring in the cation-type and anion-type facies. The HSG samples were of a [O-SO4] type for sulfide dissolution, the unaffected LSG samples were of a [Ca-HCO3] type, and the MSG samples were of a [Ca-HCO3-SO4] type.