云南某钢渣磁选尾矿堆场重金属在模拟降雨下溶出特性  

Study on Leaching Characteristics of Heavy Metals from a Magnetic Separation Tailings Yard of Steel Slag in Yunnan Province Under Simulated Rainfall

作　　者：朱晓敏 姚波 江熙 郑金龙 陶灵娟 ZHU Xiaomin;YAO Bo;JIANG Xi;ZHENG Jinlong;TAO Lingjuan(Faculty of Environmental and Chemical Engineering,Kunming Metallurgy College,Kunming 650033,China;Kunming Institute of Eco-Environmental Sciences,Kunming 650032,China)

机构地区：[1]昆明冶金高等专科学校环境与化工学院,云南昆明650033 [2]昆明市生态环境科学研究院,云南昆明650032

出　　处：《昆明冶金高等专科学校学报》2024年第2期63-72,共10页Journal of Kunming Metallurgy College

基　　金：云南省教育厅基金“云南某钢渣磁选尾砂堆场淋溶液pH调试及重金属离子溶出特性研究”(2022J1301)。

摘　　要：以云南某历史遗留钢渣磁选尾砂堆场为研究对象,对钢渣尾矿进行属性分析,采用4种不同酸度的淋溶液,进行为期42 d的动态淋溶试验,分析Fe、Zn、Cd 3种金属的淋溶释放规律,同时建立释放模型。结果表明:尾砂淋出液的pH值呈现淋溶初期pH较高,到达最大峰值后快速下降,后期保持稳定的趋势;在同等pH值条件下,粒径越小,各金属出现浓度峰值的时间较早;Fe离子浓度的溶出顺序为:酸性溶液>中性溶液>弱酸性溶液。金属Zn的溶出情况不同,Zn的溶出在淋溶初期,淋溶浓度较高,在9 d左右达到最低值,并于21~27 d内再次出现浓度峰值,且当溶液中OH-浓度增加时,溶出浓度略有升高。Cd的溶出呈现动态变化趋势,表现出间歇性快速释放的过程。二次回归方程以及DoseResp方程都能够较好地描述3种金属淋出的动力学过程。对于Fe而言,DoseResp方程比二次回归方程的相关系数R 2拟合程度更高。In this study,the magnetic separation of a historical steel slag tailings dump in Yunnan was taken as the object of study,and the properties of the steel slag tailings were analyzed.In this experiment,four leaching solutions with different acidity were used to carry out a 42-day dynamic leaching experiment to analyze the leaching release of Fe,Zn and Cd,and a release model was established.The results showed that the pH value of the tailings leachate was higher in the initial stage of leaching,and decreased rapidly after reaching the maximum,and kept stable in the later stage.Under the same pH value,the smaller the size of tailings is,the earlier the peak concentration of each metal appears.The dissolution order of Fe ion concentration is as follows:acidic solution>neutral solution>weak acidic solution.The leaching of Zn is different.The leaching of Zn was higher in the early stage of leaching,reached the lowest value in about 9 days,and the concentration peak appeared again in 21 days to 27 days.When the concentration of OH-in solution increased,the concentration increased slightly.The dissolution of Cd showed a dynamic change,showing a rapid release of intermittent process.The dynamic process of the leaching of the three metals can well describe with the quadratic regression equation and the DoseResp equation.But for Fe,the correlation coefficient R 2 of the DoseResp equation is higher than that of the quadratic regression equation.

关 键 词：钢渣 模拟酸雨 重金属 淋溶 

分 类 号：TD164.2[矿业工程—矿山地质测量]