Sulfidation of zinc plating sludge with Na2S for zinc resource recovery

Journal of Hazardous Materials
D KucharH Matsuda

Abstract

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(2)S 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 ...Continue Reading

References

Jan 25, 2002·Chemosphere·Shuzo Tokunaga, Toshikatsu Hakuta
Jun 10, 2005·Journal of Hazardous Materials·Vratislav BednarikMarek Koutny

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Citations

Mar 27, 2013·Environmental Science and Pollution Research International·Xian-De XieYan Wang
Apr 14, 2016·Environmental Science and Pollution Research International·Honghong LyuQilin Wang

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