Liu Zewei, Yang Yanyu, Xie Ming, Cheng Mingqian, Yang Ruihao, Huang Zechun, Zhou Tao, Zhao Youcai, Yang Jinzhong, Die Qingqi, Li Bin
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Sci Total Environ. 2024 Nov 20;952:175874. doi: 10.1016/j.scitotenv.2024.175874. Epub 2024 Aug 31.
The substantial generation of textile waste (TW) and red mud (RM) has resulted in significant resource wastage and environmental challenges. Co-utilization technology of solid waste is an effective approach to improve waste utilization efficiency. In this study, RM catalytic pyrolysis experiments of TW were conducted using TG-FTIR and Py-GC-MS for liquid fuel production, and TW and RM were recycled simultaneously. At the optimal experimental conditions (temperature of 600 °C and feed catalyst ratio of 2:1), the tar yield and higher heating value (HHV) of TW pyrolysis catalyzed by RM were 73.43 wt% and 32.34 kJ/g, respectively. Additionally, experiments on the pyrolysis of various TW types revealed that LDPE and PP are suitable for tar production, while cotton, nylon, and PET are more suitable as feedstock for syngas production. The RM catalytic pyrolysis mechanism of textile waste is that FeO in RM exhibits significant catalytic activity in enhancing tar and syngas yields. However, during the catalytic process, FeO undergoes reduction to FeO, resulting in diminished catalytic performance of the RM. After five cycles of use, the RM essentially lost its catalytic activity due to the accumulation of char and tar. All experimental findings of this study could offer an effective guideline for TW recycle and promoting RM utilization toward the waste-to-energy circular economy.
大量的纺织废料（TW）和赤泥（RM）的产生导致了严重的资源浪费和环境挑战。固体废物的联合利用技术是提高废物利用效率的有效途径。在本研究中，采用热重-傅里叶变换红外光谱仪（TG-FTIR）和热解气相色谱-质谱联用仪（Py-GC-MS）对TW进行RM催化热解实验以生产液体燃料，同时实现TW和RM的回收利用。在最佳实验条件下（温度为600℃，进料催化剂比例为2:1），RM催化TW热解的焦油产率和高热值（HHV）分别为73.43 wt%和32.34 kJ/g。此外，对各种类型TW的热解实验表明，低密度聚乙烯（LDPE）和聚丙烯（PP）适合用于焦油生产，而棉花、尼龙和聚对苯二甲酸乙二酯（PET）更适合作为合成气生产的原料。纺织废料的RM催化热解机理是RM中的氧化亚铁（FeO）在提高焦油和合成气产率方面表现出显著的催化活性。然而，在催化过程中，FeO会还原为氧化亚铁（FeO），导致RM的催化性能下降。经过五个循环使用后，由于焦炭和焦油的积累，RM基本上失去了催化活性。本研究的所有实验结果可为TW的回收利用以及促进RM在废物到能源循环经济中的利用提供有效的指导方针。
