Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

Author:

Klyushnikov Alexander M.ORCID,Pikalov Sergey M.ORCID,Gulyaeva Roza I.ORCID

Abstract

The kinetics of solid-state oxidation by air of iron, copper and zinc sulfide natural mixture, which is typical of the pyritic copper ores, is investigated. Using the high-temperature X-ray powder diffraction, thermogravimetry and differential scanning calorimetry, it was found that the process can be represented by five exothermic elementary reactions, corresponding to intensive burning of iron, copper and zinc sulfides, and two endothermic ones, associated with decomposition of copper and iron sulfates. Kinetic analysis is performed by Kissinger and Augis–Bennett methods, the model-free function mechanism was determined from y(α) master plots and iterative optimization of the kinetic parameters. The limiting steps of these reactions are nucleation and crystal growth, and the values of activation energy, pre-exponential factor and Avrami exponent are in the ranges of 140–459 kJ·mol–1, 1.41·104–3.49·1031 s–1, and 1.0–1.7, respectively. Crystallization is followed by an increase in the number of nuclei, which may be formed both at the interface and in the bulk of the ore particles, and crystal growth is one-dimensional and controlled by a chemical reaction at the phase boundary or diffusion. The results of the work can contribute to the development of theoretical ideas about the physicochemical transformations of pyritic ores and concentrates during pyrometallurgical operations.

Publisher

Ural Federal University

Subject

Materials Chemistry,General Chemical Engineering,General Chemistry

Reference89 articles.

1. Schlesinger ME, King MJ, Sole KC, Davenport WG. Extrac-tive Metallurgy of Copper. 5th Edition. Oxford: Elsevier; 2011.

2. Study of structure and phase composition of copper-cobalt sulfide ores of Dergamyshskoe deposit

3. Trace-elements in sulfides of the Dergamysh cobalt-bearing massive sulfide deposit, the Southern Urals: Mode of occurrence and matter sources

4. Nagaeva SP, Mezentseva OP, Kozorez MV. Mineralogical researches of copper cobalt-containing ores of Dergamysh deposit. Gornyi Zhurnal/Mining J. 2014;11:31–4.

5. Cusano G, Gonzalo MR, Farrell F, Remus R, Roudier S, Del-gado Sancho L. Best Available Techniques (BAT) Reference Document for the main Non-Ferrous Metals Industries, EUR 28648 EN, 902–910.

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3