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Mechano-chemical sulfidization of zinc oxide by grinding with sulfur and reductive additives

Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1129-1138页

作者：柴立元梁彦杰柯勇闵小波唐崇俭张海静谢先德袁翠玉中南大学冶金科学与工程学院环境工程研究所长沙410083 国家重金属污染防治工程技术研究中心长沙410083

A novel process for sulfidation of ZnO by co-grinding with sulfur and reductive additives （P, Fe, A1, and Mg） was developed. The sulfidation extent of ZnO with the addition of P, Fe, A1 or Mg can reach 85.2%, 81.6%, 96.7% and 92.6% after grinding for 4, 6, 1 and 1 h, respectively. Based on the chemical phase composition analysis and morphological characteristics of sulfidized products by XRD, SEM and TEM, a possible reaction mechanism, mechanically induced self-propagating reaction （MSR）, was proposed to explain the sulfidization reaction. In addition, the floatability of sulfidized products was investigated for the recovery of metal sulfide and ZnS can be concentrated with a high concentration ratio and concentrate grade. By using the sulfidizing process, it is expected that the recovery of zinc from the wastes or purification of heavy-metal-containing hazardous residues is technically feasible.

关键词： mechano-chemical sulfidization zinc oxide reductive additives self-propagating reaction flotation

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Mechanochemical sulfidization of a mixed oxide-sulphide copper ore by co-grinding with sulfur and its effect on the flotation efficiency

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Chinese Journal of Chemical Engineering 2020年第3期28卷 743-748页

作者： Mojtaba Masdarian Asghar Azizi Zahra Bahri Faculty of Mining Petroleum and GeophysicsShahrood University of TechnologyShahroodIran Department of Control and Modeling of Mineral Processing Systems Institute of Mineral ProcessingACECR at Tarbiat ModaresTehranIran

Mechanochemical sulfidization of a mixed sulfide/oxide copper ore by co-grinding with sulfur and additives including Mg(NO3)2 and Fe(NO3)3 salts and iron,aluminum and magnesium powders was investigated for the first ***,the influence of sulfidization during the wet-milling process was examined on the separation efficiency and recovery of copper in *** results demonstrated that co-grinding with sulfur solely had the best flotation performance at the value of 0.5 wt.%and it was attributed to the possible existence of S\\O bonding on copper oxides *** addition,adding magnesium nitrate salt,magnesium powder,iron nitrate salt and aluminum powder as additive associated with 0.5 wt%sulfur into ball milling caused the flotation improvement at the amounts of 0.2 wt%,0.2 wt%,0.5 wt%and 0.5 wt%,***,the effect of grinding time and sulfidization pH with 0.5 wt%sulfur solely was determined and pH s of 7.5 to 8.5 gave the best *** highest recovery(75.76%)and separation efficiency(63.44%)were achieved at pH of 7.5 and 8.5,respectively.

关键词： Sulphide/oxide copper ore Floatability Mechanochemical sulfidization reductive additives Recovery

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