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Ferrite process of electroplating sludge and enrichment of copper by hydrothermal reaction

机译：电镀污泥的铁素体工艺及水热反应富集铜

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摘要

In this paper, ferrite process of electroplating sludge and enrichment of copper by hydrothermal reaction was investigated. By the hydrothermal treatment, Zn, Ni, Cu, Cr-bearing electroplating sludge can be transformed into high value-added Ni-Zn-Cr ferrite by adding iron source (FeCl3·6H2O) and precipitator. The most optimum reaction conditions were explored: 1.57 g/g dry sludge as the dosage of FeCl3·6H2O, pH 8.5 of the slurry adjusted by ammonia, 4 h as the reaction time, and 200 °C as the reaction temperature. Under these conditions, the purer Ni-Zn-Cr ferrite could be prepared, and Cu was extracted to the range from 76 wt% to nearly 84 wt%, when ammonia was selected as the precipitator. Leaching toxicity of heavy metals from Ni-Zn-Cr ferrite prepared with additional iron source and precipitator, was much lower than the regulated limit of Toxicity Characteristic Leaching Procedure (TCLP), indicating that Ni-Zn-Cr ferrite synthesized hydrothermally from electroplating sludge had a better chemical stability. Therefore, the ferrite process by hydrothermal reaction is a feasible method with respect to the reuse and self-purification of electroplating sludge.
机译：本文研究了电镀污泥的铁氧体工艺和水热反应富集铜。通过水热处理，可以通过添加铁源（FeCl3·6H2O）和沉淀剂，将含锌，镍，铜，铬的电镀污泥转化为高附加值的镍锌铬铁氧体。探索了最佳的反应条件：FeCl3·6H2O用量为1.57 g / g干污泥，氨水调节浆液的pH值为8.5，反应时间为4 h，反应温度为200°C。在这些条件下，可以制备出较纯的Ni-Zn-Cr铁氧体，并且当选择氨水作为沉淀剂时，可以将Cu提取到76 wt％至近84 wt％的范围。额外的铁源和沉淀剂制备的Ni-Zn-Cr铁氧体的重金属浸出毒性远低于毒性特征浸出程序（TCLP）的规定极限，表明用电镀污泥水热合成的Ni-Zn-Cr铁氧体具有一定的溶出度。更好的化学稳定性。因此，就电镀污泥的再利用和自纯化而言，通过水热反应进行的铁氧体工艺是一种可行的方法。

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