Abstract

Carbothermic reduction of iron oxide is an important reaction in Ferro-alloy production process. Coke and bio-char are the main resource carbon for these industries. Carbon not only takes part in reduction reaction but also have important role in maintaining required carbon percentage in metal and contribution in energy supply for the process. Thus the price of carbonaceous material has significant contribution to the overall cost of Ferro-alloy production. Suitable low cost carbon materials are always in demand for such industries. In the present study low rank Indian coal has been carbonised in medium temperature level for producing an alternative semi-coke for this purpose. The coal sample has been first fractionated in two parts based on particle size distribution. Larger size samples are directly carbonised in a laboratory scale coke oven using non-recovery type coke making technique. Finer fractions are first carbonised, then agglomerated into small briquettes and subsequently de-volatilised for lowering volatile matter content, enhancement of fixed carbon and improvement of other properties.

中文翻译：

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铁合金工业用劣质煤替代焦炭

摘要

氧化铁的碳热还原是铁合金生产过程中的重要反应。焦炭和生物炭是这些行业的主要资源碳。碳不仅参与还原反应，而且在保持金属中所需的碳百分比以及为该过程的能源供应中发挥重要作用。因此，含碳材料的价格对铁合金生产的总成本有重大贡献。对于这些行业总是需要合适的低成本碳材料。在本研究中，低等级印度煤已在中等温度下碳化，以生产用于此目的的替代半焦。首先根据粒度分布将煤样品分为两部分。使用非回收型焦炭制造技术，将较大尺寸的样品直接在实验室规模的焦炉中碳化。较细的馏分首先进行碳化，然后聚集成小块状煤，然后进行脱挥发分，以降低挥发物含量，增强固定碳和改善其他性能。