Inhibition of acid mine drainage and immobilization of heavy metals from copper flotation tailings using a marble cutting waste
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第1期
论文作者：Gulsen Tozsin
文章页码：1 - 6
摘 要：Acid mine drainage（AMD） with high concentrations of sulfates and metals is generated by the oxidation of sulfide bearing wastes. Ca CO3-rich marble cutting waste is a residual material produced by the cutting and polishing of marble stone. In this study, the feasibility of using the marble cutting waste as an acid-neutralizing agent to inhibit AMD and immobilize heavy metals from copper flotation tailings（sulfide-bearing wastes） was investigated. Continuous-stirring shake-flask tests were conducted for 40 d, and the p H value, sulfate content, and dissolved metal content of the leachate were analyzed every 10 d to determine the effectiveness of the marble cutting waste as an acid neutralizer. For comparison, Ca CO3 was also used as a neutralizing agent. The average p H value of the leachate was 2.1 at the beginning of the experiment（t = 0）. In the experiment employing the marble cutting waste, the p H value of the leachate changed from 6.5 to 7.8, and the sulfate and iron concentrations decreased from 4558 to 838 mg/L and from 536 to 0.01 mg/L, respectively, after 40 d. The marble cutting waste also removed more than 80wt% of heavy metals（Cd, Cr, Cu, Ni, Pb, and Zn） from AMD generated by copper flotation tailings.
Gulsen Tozsin
Department of Mining Engineering, Ataturk University
摘 要：Acid mine drainage（AMD） with high concentrations of sulfates and metals is generated by the oxidation of sulfide bearing wastes. Ca CO3-rich marble cutting waste is a residual material produced by the cutting and polishing of marble stone. In this study, the feasibility of using the marble cutting waste as an acid-neutralizing agent to inhibit AMD and immobilize heavy metals from copper flotation tailings（sulfide-bearing wastes） was investigated. Continuous-stirring shake-flask tests were conducted for 40 d, and the p H value, sulfate content, and dissolved metal content of the leachate were analyzed every 10 d to determine the effectiveness of the marble cutting waste as an acid neutralizer. For comparison, Ca CO3 was also used as a neutralizing agent. The average p H value of the leachate was 2.1 at the beginning of the experiment（t = 0）. In the experiment employing the marble cutting waste, the p H value of the leachate changed from 6.5 to 7.8, and the sulfate and iron concentrations decreased from 4558 to 838 mg/L and from 536 to 0.01 mg/L, respectively, after 40 d. The marble cutting waste also removed more than 80wt% of heavy metals（Cd, Cr, Cu, Ni, Pb, and Zn） from AMD generated by copper flotation tailings.
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