Abstract For the clean and efficient utilizaiton of waste plastics, an integrated flowsheet, including low temperature heat treatment pulverization and composite pellet reduction, has been proposed and the fundamental research has been conducted. The PE film could be easily pulverized by heat treatment at 250 °C for 20 min after mixed with coal powder (mass ratio of PE 20 % of coal). The pulverized heated mixture had better reactivity than original coal and could be used as the reducing agent of composite pellet. The reducibility of heated mixture pellet was better than coal pellet with the C/O of 1.0. The appropriate reduction temperature should be around 1100 °C and the metallization degree was bigger than 90 % when reduced for 30 min. The off gas of heated mixture pellet contained more H2 and CO. The concentration value of H2 peak of heated mixture pellet was 5 times of that of coal pellet. However, the concentration value of largest CO peak of heated mixture pellet was about 48.7 % higher than that of coal pellet. The experimental results show the possibility that the novel technology can efficiently utilize iron ore and waste plastics to produce metallic iron and syngas.

中文翻译：

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热处理粉碎与直接还原相结合，高效利用废塑料作为原料生产金属铁和合成气

摘要 为实现废塑料的清洁高效利用，提出了低温热处理粉碎和复合颗粒还原一体化工艺流程，并进行了基础研究。PE薄膜与煤粉混合后（PE的质量比为20%煤），在250℃下热处理20分钟很容易粉碎。粉碎后的加热混合物比原煤具有更好的反应性，可用作复合球团的还原剂。加热混合球团的还原性优于C/O为1.0的煤球团。合适的还原温度应在1100℃左右，还原30分钟金属化度大于90%。加热的混合物颗粒的废气含有更多的 H2 和 CO。加热混合球团的H2峰浓度值是煤球团的5倍。然而，加热混合球团的最大 CO 峰浓度值比煤球团高约 48.7%。实验结果表明，该新技术可以有效利用铁矿石和废塑料生产金属铁和合成气。