Zhao Hong-Xing, Zhou Feng-Shan, Evelina L M Amutenya, Liu Jin-Liang, Zhou Yi
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, PR China.
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, PR China.
J Hazard Mater. 2022 Feb 5;423(Pt B):127056. doi: 10.1016/j.jhazmat.2021.127056. Epub 2021 Aug 30.
Reducing the cost of pellet additives as a substitute for reducing bentonite binder is an important research direction of new pellet additives. There are some industrial solid wastes that have the similar physical and chemical properties to bentonite, and SiO content of them may be much lower than bentonite, but also contains a lot of FeO, AlO, MgO, BO and other components beneficial to the quality of pellets, which have been paid more attention by many pellet workers. In this review, the effect mechanism of FeO, NaO/KO, AlO, SiO, CaO, MgO and BO in the industrial solid wastes on the fired strength and reduction expansion of pellets were systematically summarized. At the same time, the influences of five representative large scale modified industrial solid waste additives including iron tailings, bauxite tailings, fly ash, red mud and boron sludge on the properties of green pellets and finished pellets were described in detail. It can be seen that the applications of industrial solid waste in pellet additives can partially or completely replace bentonite binder, especially fly ash, red mud and boron sludge, which can not only improve the quality of pellets, but also decrease the cost, save energy and reduce pollution, with significant economic benefits.
降低球团添加剂成本以替代膨润土粘结剂是新型球团添加剂的一个重要研究方向。有一些工业固体废物，其理化性质与膨润土相似，它们的SiO含量可能比膨润土低得多，但还含有大量对球团质量有益的FeO、AlO、MgO、BO等成分，已受到众多球团工作者的更多关注。在本综述中，系统总结了工业固体废物中FeO、NaO/KO、AlO、SiO、CaO、MgO和BO对球团焙烧强度和还原膨胀的作用机理。同时，详细描述了包括铁尾矿、铝土矿尾矿、粉煤灰、赤泥和硼泥在内的五种具有代表性的大规模改性工业固体废物添加剂对生球团和成品球团性能的影响。可以看出，工业固体废物在球团添加剂中的应用可以部分或完全替代膨润土粘结剂，特别是粉煤灰、赤泥和硼泥，它们不仅可以提高球团质量，还能降低成本、节约能源和减少污染，具有显著的经济效益。
