BenefIciation of an Oolitic-Iron ORE by Magnetization Roasting and Magnetic Separation

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-09-10 DOI:10.22068/IJMSE.17.3.17

M. Monzavi, S. Raygan

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引用次数: 1

Abstract

Low-grade iron ores contain many impurities and are difficult to upgrade to make appropriate concentrates for the blast furnace (BF) or direct reduction (DR) technologies. In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Fe2O3) with magnetization roasting by non-coking coal (containing 62.1wt% fixed carbon) under a stream of argon gas was investigated. Then, a 2500 Gaussian magnet was used for dry magnetic separation method. The effects of roasting time, ore particle size and reaction temperature on the amount of separated part and grade of the product were examined. It was found out that the hematite inside the ore could almost be completely converted into magnetite with stoichiometric ratio of coal to ore at the roasting temperature of 625 °C for 25 min. Under the optimum condition, a high amount of magnetic part of the product (72.22 wt.%) with a grade of 92.7% was separated. The most important point in this process was the prevention of reduced ore from re-oxidation reaction by controlling roasting atmosphere, time and temperature. In addition, different analytical methods such as X-ray fluorescence (XRF), X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG) and scanning electron microscopy (SEM) were applied to investigate and expound the results..

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一种鲕状铁矿的磁化焙烧和磁选选矿

低品位铁矿含有许多杂质，难以升级为适合高炉或直接还原技术的精矿。采用含固定碳62.1wt%的非炼焦煤(含固定碳62.1wt%)在氩气流下进行磁化焙烧，研究了某鲕状铁矿(含Fe2O3 45.46wt%)的选矿工艺。然后，采用2500高斯磁体进行干式磁选。考察了焙烧时间、矿石粒度和反应温度对产品分选量和品位的影响。结果表明，在625℃焙烧25 min条件下，矿石中赤铁矿几乎可以完全转化为煤矿比为化学量的磁铁矿，在最佳焙烧条件下，分离出了品位为92.7%的高磁性部分(72.22 wt.%)。控制焙烧气氛、焙烧时间和焙烧温度，防止还原矿发生再氧化反应是该工艺的重点。此外，采用x射线荧光(XRF)、x射线衍射(XRD)、差热分析(DTA)、热重分析(TG)和扫描电镜(SEM)等不同的分析方法对结果进行了研究和阐述。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.