Sulfidation Roasting of Hemimorphite with Pyrite for the Enrichment of Zn and Pb

Min, Xin; Xue, Ke; Ke, Yanxiong; Zhou, Boting; Li, Yang-Wen-Jun; Wang, Qingwei

doi:10.1007/s11837-016-1986-y

Cited by 9 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this purpose, sulfidation has received much attention as a possible generic technology for heavy metal recovery. At present, a number of sulfidation technologies, including surface sulfidation with Na 2 S 14 – 16 , mechanochemical sulfidation 17 – 19 , hydrothermal sulfidation 20 – 22 , and sulfidation roasting 23 – 25 , have been developed for improving the floatability of metal oxides. The most common approach commercially is to sulfidize the surfaces of oxide minerals with Na 2 S prior to flotation, after which the hydrophilicity of their surfaces is significantly decreased due to the presence of chemisorbed sulfide ions 26 .…”

Section: Introductionmentioning

confidence: 99%

Sulfidation mechanism of ZnO roasted with pyrite

Liu

Zhu

Han

et al. 2018

Sci Rep

View full text Add to dashboard Cite

Sulfidation is a widely used technology to improve the floatability of oxidized metal minerals or to stabilize the heavy metals in various wastes. The sulfidation mechanism of ZnO with pyrite was detailedly studied by thermodynamic calculation and roasting experiments. The sulfidation behaviors, phase transformations, microscopic morphology and surface properties were investigated by TG-DSC, ICP, XRD, SEM-EDS, and XPS analysis. The results indicate that the nature of the sulfidation is the reaction of ZnO with the gaseous sulfur generated by the decomposition of pyrite. Pyrite instead of sulfur as the sulfidizing agent can not only relieve the volatilization loss of sulfur but also enhance the formation of liquid phase and thus facilitate the growth of ZnS particles. The sulfidation reaction belongs to surface chemical reaction and relates to the migration of oxygen from the inside of ZnO to its surfaces. The presence of carbon not only eliminates the release of SO2, but also decreases the decomposition temperature of pyrite and promotes the sulfidation of ZnO. The addition of Na2CO3 promotes the sulfidation of ZnO at lower temperatures (below 850 °C) and enhances the growth of ZnS particles but has a negative effect on the sulfidation at higher temperatures.

show abstract