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首页> 外文期刊>Journal of Hazardous Materials >Sulfidation of zinc plating sludge with Na_2S for zinc resource recovery
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Sulfidation of zinc plating sludge with Na_2S for zinc resource recovery

机译：Na_2S硫化镀锌污泥可回收锌资源

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摘要

A high amount of zinc disposed in the landfill sites as a mixed-metal plating sludge represents a valuable zinc source. To recover zinc from the plating sludge, a sulfidation treatment is proposed in this study, while it is assumed that ZnS formed could be separated by flotation. The sulfidation treatment was conducted by contacting simulated zinc plating sludge with Na_2S solution at S~(2-) to Zn~(2+) molar ratio of 1.5 for a period of 1-48 h, while changing the solid to liquid (S:L) ratio from 0.25:50 to 1.00:50. The conversion of zinc compounds to ZnS was determined based on the consumption of sulfide ions. The reaction products formed by the sulfidation of zinc were identified by X-ray diffraction (XRD). As a result, it was found that the conversion of zinc compounds to ZnS increased with an increase in S:L ratio. A maximum conversion of 0.809 was obtained at an S:L ratio of 1.00:50 after 48 h. However, when the zinc sludge treated at S:L ratio of 1.00:50 for 48 h was subjected to XRD analyses, only ZnS was identified in the treated zinc sludge. The result suggested that the rest of zinc sludge remained unreacted inside the agglomerates of ZnS. The formation behavior of ZnS was predicted by Elovich equation, which was found to describe the system satisfactorily indicating the heterogeneous nature of the sludge.
机译：作为混合金属电镀污泥，大量存在于垃圾填埋场中的锌代表了宝贵的锌源。为了从电镀污泥中回收锌，本研究提出了一种硫化处理方法，同时假定形成的ZnS可以通过浮选分离。通过将模拟镀锌污泥与Na_2S溶液以S〜（2-）与Zn〜（2+）的摩尔比为1.5的条件进行1-48小时的硫化处理，同时将固体变为液体（S： L）比率从0.25：50到1.00：50。根据硫化物离子的消耗确定锌化合物向ZnS的转化率。通过X射线衍射（XRD）鉴定由锌的硫化形成的反应产物。结果发现，随着S∶L比的增加，锌化合物向ZnS的转化率增加。 48小时后，S：L比率为1.00：50时，最大转化率为0.809。然而，当以1.00：50的S：L比例处理48小时的锌污泥进行XRD分析时，在处理过的锌污泥中仅发现ZnS。结果表明，剩余的锌污泥在ZnS附聚物内部仍未反应。通过Elovich方程预测了ZnS的形成行为，发现该方程可以令人满意地描述该系统，表明污泥的非均质性。

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