标题：Purification of specularite by centrifugation instead of flotation to produce iron oxide red pigment
作者：Zhang X.; Zhu S.-W.; Li Y.-J.; Li Y.-L.; Guo Q.; Qi T.
作者机构：[Zhang, X] National Engineering Laboratory of Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of S 更多
通讯作者地址：[Li, Y.-L] National Engineering Laboratory of Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of S 更多
来源：International Journal of Minerals, Metallurgy and Materials
关键词：centrifugal concentrator; iron oxide red pigment; reconcentration; specularite
摘要：This study used specularite, a high-gradient magnetic separation concentrate, as a raw material in reverse flotation. An iron concentrate with a grade of 65.1wt% and a recovery rate of 75.31% were obtained. A centrifugal concentrator served as the deep purification equipment for the preparation of iron oxide red pigments, and its optimal rotating drum speed, feed concentration, and other conditions were determined. Under optimal conditions, a high-purity iron oxide concentrate with a grade of 69.38wt% and a recovery rate of 80.89% were obtained and used as a raw material for preparing iron oxide red pigment. Calcining with sulfuric acid produced iron red pigments with different hues. Simultaneously, middlings with a grade of 60.20wt% and a recovery rate of 17.51% were obtained and could be used in blast furnace ironmaking. High-value utilization of specularite beneficiation products was thus achieved. © 2020, University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature.