Immobilization of copper under an acid leach of colloidal pyrite waste rocks by a fixed-bed column View Full Text


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Article Info

DATE

2016-02

AUTHORS

Yan Yang, Tianhu Chen, Ping Li, Chengsong Qing, Qiaoqin Xie, Xinmin Zhan

ABSTRACT

Colloidal pyrite waste rocks (CPWR) which are mainly composed of colloidal pyrite and siderite widely deposit in sulfide mines in the middle and lower reaches of the Yangtze River belt, China, especially in Tongling City, Anhui Province, China. In this paper, a fixed-bed column was used to investigate the weathering and oxidation of CPWR and its role in immobilizing low-concentration Cu (10 mg L−1) under weakly acidic leach (pH = 5.0). The experimental results indicated that the breakthrough capacity was around 14.0 mg Cu g−1 CPWR when Cu2+ breakthrough concentration was 0.5 mg L−1. Sequential extraction of Cu and dithionite–citrate–bicarbonate extraction of free iron in the used CPWR after the column breakthrough indicated that Cu removal by CPWR consisted of the following processes: oxidation of pyrite and dissolution of siderite in CPWR, ferrous oxidation, and adsorption of Cu on ferric (hydr)oxides. This study shows the potential application of CPWR as an effective sorbent for the removal of low-concentration Cu from acid mine drainage. More... »

PAGES

205

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    DOI

    http://dx.doi.org/10.1007/s12665-015-4991-5

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