Heavy Metal Pollution Potential of Zinc Leach Residues Discarded in çinkur Plant
Heavy Metal Pollution Potential of Zinc Leach Residues Discarded in çinkur Plant
复制标题
çinkur厂废弃锌浸渣的重金属污染潜力
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
R. Orhan
中科院分区：
文献类型：
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作者：
H. Altundoğan;M. Erdem;R. Orhan
本文介绍了焦化氧化Waelz滤饼浸出及焦化过程中收集的烟道粉尘对重金属溶解度的研究结果。通过系统的溶解度测试，研究了重金属在水中的释放。考察了接触时间、pH、液固比和连续提取对重金属（Cd、Pb、Mn和Zn）释放的影响，并将其浓度与地表水的各种限值进行了比较。此外，对这两种残留物进行了EPA批准的“提取程序测试”，以确定从中释放的金属浓度是否超过EPA对固体废物规定的毒性限值。发现滤饼中金属的增溶作用与液固比、接触时间和混合物的pH值有关。根据这些参数，饼中溶解金属的浓度是不同的。而介质的pH值是影响滤饼溶解度的最有效参数。酸度的增加会加速金属向溶液中的释放，而对铅的增溶作用影响不大。在pH值为5的条件下，采用EPA提取工艺提取的滤饼中Cd和Pb的浓度分别超过1.0 mg/L和5.0 mg/L，达到毒性限值。溶液中其他金属的浓度均超过地表水各种质量标准的限值。综上所述，浸出渣是一种对环境有害的废弃物。
In this paper, results of the study on heavy metals solubility behaviour of filter cakes from leaching of clinkerized Waelz oxide and flue dust collected during clinkerization in cinkur plant are given. The release of heavy metals into water was investigated by subjecting the cakes to solubility tests systematically. The effect of contact time, pH, liquid/solid ratio and successive extractions on the releasing of heavy metals (Cd, Pb, Mn and Zn) into water was examined and their concentrations in the solutions were compared to the various limits for surface waters. Also, ``Extraction procedure tests'' approved by EPA were applied to the both residues to determine whether concentration of metals released from them are over toxicity limits given by EPA for solid wastes. Solubilization of metals from filter cakes was found to be a function of liquid/solid ratio, contact time and pH of mixture. Depending upon these parameters, the concentration of solubilized metals from the cakes is various. However, the pH of medium is most effective parameter for the solubility of filter cakes. The release of metals into solution was accelerated by increasing acidity, whereas solubilization of Pb was not affected very much. The concentration of Cd and Pb in the extracts obtained from filter cakes by applying EPA extraction procedures at pH 5 are over 1.0 and 5.0 mg/L which are toxicity limits, respectively. The concentration of other metals in the solution are above the limits given by various quality standard for surface water. From these findings, it can be resulted that leach residues are hazardous wastes for environment.