Eco-friendly low-carbon manganese ferroalloy production for cleaner steel technologies

IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL
Navneet Singh Randhawa, Rajesh Kanyut Minj, Krishna Kumar
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Abstract

Global steel production, a major contributor to anthropogenic carbon dioxide, heavily relies on manganese, a key ingredient that significantly impacts the carbon footprint during the production of high-carbon ferromanganese. A single-step generation of low-carbon ferromanganese (LC-FeMn) from manganese ore in an electric arc furnace (EAF) was investigated. The theoretical and experimental investigations helped to balance the required and supplied energy. The process sustainability was predicted based on the enthalpy of the reaction. Pre-reduction of manganese ore decreased energy consumption in the smelting process and saved raw materials costs. The simulation studies revealed a significant effect of lime and silica on the slag-metal equilibrium. It further confirmed the best-reducing condition with the basicity 1.5–1.77 by smelting tests in EAF. Experimental results showed an optimal charge mixture comprising appropriate ratios of ore:SiMn:lime ratio, producing a standard-grade product. Simultaneous melting and smelting sensibly used the exothermic heat, consuming 410–880 kWh/ton, much lower than the international benchmark, i.e. approximately 2000 kWh/ton. The characterization of resulting slags corroborated the advantages of the manganese ore pre-reduction on the energy and reductant consumption, alloy grade, and slag characteristics. The present study's findings can potentially contribute to the ongoing low-carbon initiatives of steel.

Abstract Image

生态友好型低碳锰铁合金生产促进清洁钢铁技术的发展
全球钢铁生产是人为二氧化碳的主要排放源,严重依赖锰,而锰是生产高碳锰铁过程中对碳足迹产生重大影响的关键成分。我们研究了在电弧炉(EAF)中以锰矿石为原料一步生成低碳锰铁(LC-FeMn)的方法。理论和实验研究有助于平衡所需能源和供应能源。根据反应热焓预测了工艺的可持续性。锰矿的预还原降低了冶炼过程中的能耗,节约了原材料成本。模拟研究表明,石灰和二氧化硅对熔渣-金属平衡有显著影响。通过在电弧炉中的冶炼试验,进一步确认了碱度为 1.5-1.77 的最佳还原条件。实验结果表明,由矿石、锰硅和石灰的适当比例组成的最佳炉料混合物可生产出标准级产品。同时熔化和冶炼合理地利用了放热,耗电量为 410-880 千瓦时/吨,远低于国际基准(约 2000 千瓦时/吨)。所得炉渣的特征证实了锰矿预还原在能源和还原剂消耗、合金等级和炉渣特征方面的优势。本研究的发现有可能为正在进行的钢铁低碳计划做出贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cleaner Engineering and Technology
Cleaner Engineering and Technology Engineering-Engineering (miscellaneous)
CiteScore
9.80
自引率
0.00%
发文量
218
审稿时长
21 weeks
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