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Isothermal reduction kinetics of zinc calcine under carbon monoxide

Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2274-2282页

作者： Yu-jie CHEN Yun-yan WANG Ning PENG Yan-jie LIANG Bing PENG Institute of Environmental Science and Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China

The reduction kinetics of zinc calcine under a CO atmosphere was evaluated by isothermal reductive roasting in a temperature range of 600-800℃.The extent of reaction of zinc calcine was measured using thermogravimetry(TG),and the decomposition mechanism of zinc ferrite in zinc calcine was analyzed based on variations in the soluble zinc and ferrous *** results indicate that the reaction was controlled by the nucleation of the products,with an apparent activation energy of 65.28 k J/*** partial pressure of CO affected the reaction rate more strongly than the CO intensity(defined as PCO/(PCO+PCO2)).The generation rate of zinc oxide was higher than that of ferrous oxide;therefore,the nucleation of ferrous oxide is the rate-determining step of the reaction.

关键词： reduction kinetics zinc calcine zinc ferrite carbon monoxide

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Element distribution of high iron-bearing zinc calcine in high gradient magnetic field

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Transactions of Nonferrous Metals Society of China 2012年第9期22卷 2261-2267页

作者：李密彭兵柴立元王纪明彭宁闫缓中南大学冶金科学与工程学院长沙410083 国家金属污染防治工程技术研究中心长沙410083

High gradient magnetic separation was conducted in order to separate insoluble zinc ferrite from zinc calcine before acid leaching of hydrometallurgical process. Chemical composition and structural characterization of zinc calcine were studied via inductively coupled plasma （ICP）, X-ray diffraction （XRD）, Mossbauer spectra, scanning electron microscopy （SEM） and laser particle analysis （LPA）. The parameters of magnetic separation which affect the distribution of zinc ferrite and undesired elements, such as calcium, sulfur and lead in magnetic concentrate were investigated. The results of high gradient magnetic separation indicate that more than 85% of zinc ferrite is distributed into magnetic concentrate from the zinc calcine under the magnetic induction of 0.70 T. In addition, about 60% of calcium and 40% of sulfur distribute in non magnetic phases of tailings during magnetic separation process. Most of lead distributes uniformly along the zinc calcine in superfine particle size.

关键词： zinc calcine zinc ferrite magnetic separation element distribution

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