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Reduction behaviour of Odisha Sands Complex, India ilmenite-coke composite pellets

Odisha Sands Complex 公司复合钛铁矿-焦炭复合球团还原行为

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Abstract

Presently, ilmenite concentrates from Odisha Sands Complex at Chhatrapur, India are utilized to produce TiO2 slag by direct smelting in an electric arc furnace. However, the process involves the consumption of excess electrical energy and difficulty in handling the arc furnace due to frothing effects. A more efficient process of pre-reducing the ilmenite before smelting has been proposed in the present communication. In particular, studies have been undertaken on the reduction process of ilmenite-coke composite pellets. The difference in the reduction behaviour of raw ilmenite and ilmenite-coke composite pellets has been established and compared with that of the pre-oxidized raw pellets. The effects of various processing parameters like temperature, residence time, and reductant percentage on the metallization of composite pellets in a static bed have been investigated. Metallization of about 90% has been achieved at 1250 °C for a reduction period of 360 min with a 4°% coke composition. Furthermore, the reduced pellets have been characterized through chemical analysis, optical microscopy, field emission scanning electron microscopy and X-ray diffraction analysis. The reduction behaviour of composite pellets has also been found better than that of pre-oxidized pellets indicating the former to be more efficient.

摘要

目前, 印度 Chhatrapur 的 Odisha Sands Complex 公司通过在电弧炉中直接熔炼钛铁矿精矿来还原 TiO2 矿渣. 然而, 这一过程涉及到大量电能的消耗和由于泡沫效应而难以处理电弧炉的问题. 本文提出了一种更有效的在熔炼前预还原钛铁矿的工艺, 特别对钛铁矿-焦炭复合球团的还原过程进行了研究. 分析了原钛铁矿和钛铁矿-焦炭复合球团还原行为的差异, 并与预氧化的原球团的还原行为进 行了比较. 研究了温度、 还原时间、 还原剂用量等工艺参数对静态床上复合球团的金属化的影响. 在 1250 °C, 还原时间为 360 min, 焦炭含量为4%的条件下, 实现了约90%的金属化. 此外, 通过化学分析、 光学显微镜、 场发射扫描电子显微镜和 X 射线衍射分析对还原球团进行了表征. 结果表明复合球团的还原行为优于预氧化球团, 说明前者更有效.

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Acknowledgements

The authors are thankful to the OSCOM for providing the ilmenite concentrate sample and to Professor Suddhasatwa BASU, the Director of CSIR-Institute of Minerals and Materials Technology for his consent to publish this work.

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  1. CSIR-Institute of Minerals & Materials Technology, Bhubaneswar, Odisha, 751013, India

    D. Nayak, N. Ray, N. Dash, S. S. Rath & S. K. Biswal

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Correspondence to D. Nayak.

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Foundation item: Project(MLP-52) supported by the Council of Scientific and Industrial Research (CSIR), India

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Nayak, D., Ray, N., Dash, N. et al. Reduction behaviour of Odisha Sands Complex, India ilmenite-coke composite pellets. J. Cent. South Univ. 27, 1678–1690 (2020). https://doi.org/10.1007/s11771-020-4399-6

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