School of Tourism and Urban Management, Jiangxi University of Finance and Economics, Nanchang, 330013, People's Republic of China.
Department of Engineering and Safety, UiT-the Arctic University of Norway, N-9037, Tromsø, Norway.
Environ Monit Assess. 2019 Jan 31;191(2):123. doi: 10.1007/s10661-019-7244-3.
High amounts of tailings with a low recycling rate are generated during mining and smelting processes, and a lot of environmental problems were caused by heavy metal leaching from tailings. Temperature is a key point in heavy metals leaching, and knowing the effects of temperature on tailings leaching is useful for tailings management. A small-scale batch leaching experiment was conducted at different temperatures to test temperature-driven heavy metal leaching from tailings in the arctic area. The variation in the leaching of heavy metals from tailings was investigated by a small-scale batch leaching experiment. Results showed that 10 °C is a threshold temperature for the leaching activity of the tested elements. Fe, Cr, and Cu are significantly correlated with temperature in the leaching. Leaching rates of Cr, Cu, and Ni increase as temperature rises. Leaching rates of Cr, Cu, Ni, V, and Zn change by a polynomial model with temperatures, whereas that of Fe changes with a linear model. V shows an antagonistic relationship with Cu, Fe, and Ni in the leaching. However, Cu, Cr, Ni, and Fe show a synergistic relationship. Discovering the threshold temperature of leaching tailings in the arctic area and concluding the influence factors and the relationship between heavy metals leaching and temperature are useful for tailings management.
在采矿和冶炼过程中会产生大量尾矿，且由于重金属从尾矿中浸出，会引发很多环境问题。温度是重金属浸出的一个关键点，了解温度对尾矿浸出的影响有助于尾矿管理。本研究开展了不同温度下的小型批式浸出实验，以测试北极地区尾矿中重金属的温度驱动浸出情况。通过小型批式浸出实验研究了重金属从尾矿中的浸出变化。结果表明，10℃是测试元素浸出活性的一个阈值温度。在浸出过程中，Fe、Cr 和 Cu 与温度显著相关。随着温度升高，Cr、Cu 和 Ni 的浸出率增加。Cr、Cu、Ni、V 和 Zn 的浸出率随温度呈多项式模型变化，而 Fe 的浸出率随温度呈线性模型变化。V 在浸出过程中与 Cu、Fe 和 Ni 呈拮抗关系，而 Cu、Cr、Ni 和 Fe 则呈协同关系。发现北极地区尾矿浸出的阈值温度，并得出重金属浸出与温度之间的影响因素和关系，有助于尾矿管理。
