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Microwave-Intensified Reduction of Biochar-Containing Briquettes

机译：微波强化还原生物炭型煤

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摘要

The coal-based direct reduction process has gradually become the focus of research concerning direct reduced iron production due to its advantages, including high reduction rate, stable chemical composition, and good metallurgical properties of products. Based on coal-based reduction theory and briquetting technique, this paper reports the use of microwave energy for intensifying the reduction of carbon-containing briquettes mainly consisting of magnetite concentrate and biochar. The heating behaviors of the raw materials show that under the conditions of microwave power of 1250 W, N_2 flow rate of 4 L min~(-1) and briquetting pressure of 400 N, the briquettes present the highest heating rate. The average heating rate reaches 35.16 ℃ min~(-1). When the briquettes are irradiated by microwaves at 1050 ℃ for 45 min, the metallization degree of the reduced briquettes reaches 93.58%.
机译：煤基直接还原法由于具有还原率高，化学成分稳定，产品冶金性能好等优点，已逐渐成为有关直接还原铁生产的研究重点。基于煤基还原理论和压块技术，本文报道了利用微波能量加强还原以磁铁矿精矿和生物炭为主要成分的含碳煤块的方法。原料的加热行为表明，在微波功率为1250 W，N_2流量为4 L min〜（-1），团块压力为400 N的条件下，团块的加热速率最高。平均升温速率达到35.16℃min〜（-1）。在1050℃的微波下对煤饼进行45min的热处理后，还原后的煤饼的金属化程度达到93.58％。

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