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Beneficiation of an Indian non-coking coal by column flotation

International Journal of coal Science & Technology 2016年第2期3卷 206-214页

作者： N. Vasumathi T. V. Vijaya Kumar S. Ratchambigai S. Subba Rao S. Prabhakar G. Bhaskar Raju CSIR-National Metallurgical Laboratory Madras Centre CSIR Madras Complex Taramani Chennai 600 113 India

Beneficiation of non-coking coal is gaining ground in India. It not only reduces the volume of inert content to be transported to the power plant and also lowers the wear in the boiler houses. For special applications such as the fuel for integrated gasification combined cycle plant （IGCC）, the ash content in the coal should preferably be below 15 %. Indian coals are characterized by high inter-grown ash content mainly due to ＇drift origin＇ of Gondwana formation in Permian age. This warrants fine grinding of non-coking coal in order to liberate the ash forming minerals from coal macerals. A non- coking coal sample of vitrinite type from India was ground to 44 ~tm （dso） and subjected to column flotation to improve its quality. The non-coking coal analyzing 34.6 % ash, 26.2 % volatile matter, 1.3 % moisture and 37.9 % fixed carbon could be upgraded to a concentrate/froth of 14.83 % ash at 72.18 % yield by optimizing collector and frother dosages and flotation column operating parameters, namely, froth depth, superficial feed velocity and superficial air velocity. The concentrate produced by this process is suitable as fuel for IGCC in coal-to-electricity route.

关键词： non-coking coal Washability Beneficiation Column flotation coal gasification

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Development of carbon composite iron ore micropellets by using the microfines of iron ore and carbon-bearing materials in iron making

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International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 132-140页

作者： Jagannath Pal Satadal Ghorai Avimanyu Das National Metallurgical Laboratory Council of Scientific and Industrial Research

Iron ore microfines and concentrate have very limited uses in sintering processes. They are used in pelletization; however, this process is cost intensive. Furthermore, the microfines of non-coking coal and other carbon-bearing materials, e.g., blast-furnace flue dust （BFD） and coke frees, are not used extensively in the metallurgical industry because of operational difficu]ties and handling problems. In the present work, to utilize these microfines, coal composite iron oxide micropellets （2-6 mm in size） were produced through an innovative technique in which lime and molasses were used as binding materials in the micropellets. The micropellets were subsequently treated with CO2 or the industrial waste gas to induce the chemical bond formation. The results show that, at a very high carbon level of 22wt% （38wt% coal）, the cold crushing strength and abrasion index of the micropellets are 2.5-3 kg/cm2 and 5wt%-9wt%, respectively; these values indicate that the pellets are suitable for cold handling. The developed micropellets have strong potential as a heat source in smelting reduction in iron making and sintering to reduce coke breeze. The micropellets produced with BFD and coke fines （8wt%-12wt%） were used in iron ore sin- tering and were observed to reduce the coke breeze consumption by 3%-4%. The quality of the produced sinter was at par with that of the conventional blast-furnace sinter.

关键词： ironmaking microfines non-coking coal iron ore concentrates micropellets pelletizing, waste utilization

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Evaluation of Four coals for Blast Furnace Pulverized coal Injection

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Journal of Iron and Steel Research International 2010年第3期17卷 8-12,20页

作者： Sh Raygan H Abdizadeh A Eskandari Rizi School of Metallurgy and Materials Engineering University of Tehran

One of the effective methods of reducing coke consumption is pulverized coal injection. The most important problems encountered in this method are reduced permeability, unburned and high ash content. To select the best coal for injection, suitable tests can be used. Therefore, experiments such as proximate and ultimate analysis, Rock- Eval and combustion tests were performed on four kinds of coals from different mines, including Sarakhs, Sangrood, Karmozd, and Tabas. The results of proximate and ultimate analysis indicated that although the sulfur content and ash content of selected coals were a little high, they were suitable for coal injection. The results of combustion experiments and Rock-Eval tests showed that Karmozd coal was the best one to be injected into blast furnace. The result indicated that the mixing of coals could improve the combustion properties of pulverized coals.

关键词： pulverized coal blast furnace non-coking coal

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奎那那HIsmelt工厂调试生产

奎那那HIsmelt工厂调试生产

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2005中国钢铁年会

作者：尼尔·古德曼亚德里安·姆尔梅根·约翰逊 HIsmelt有限公司 Leath Road KWINANA WA6167 HIsmelt有限公司 Leath Road KWINANA WA6167 HIsmelt有限公司 Leath Road KWINANA WA6167

＜正＞ 1 概要现代的世界是建立在铁的力量及其可靠性上,其主要的表现形式是钢。目前,我们注意到了对这些产品前所未有的需求趋势。尤其是在亚洲地区,例如中国目前在城市化和工业发展的过程中正努力满足对钢铁产品的不断需求。为满足这... 详细信息

＜正＞ 1 概要现代的世界是建立在铁的力量及其可靠性上,其主要的表现形式是钢。目前,我们注意到了对这些产品前所未有的需求趋势。尤其是在亚洲地区,例如中国目前在城市化和工业发展的过程中正努力满足对钢铁产品的不断需求。为满足这—需求,相关国家正致力于在环保、技术和资金允许的条件下迅速扩大产能。作为开发了具有革命意义的直接熔融还原技术的HIsmelt公司,基于其在西澳大利亚奎那那兴建的首家HIsmelt商业工厂试生产得出的令人鼓舞的结果,目前可以为这一需求提供助力。

关键词： direct smelting technology iron ore fines ironmaking non-coking coal smelt reduction

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