SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 353-359.DOI: 10.1016/j.cjche.2020.09.020

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Investigation on the fabrication of lightweight aggregate with acid-leaching tailings of vanadium-bearing stone coal minerals and red mud

Chunguang Song1,2,3, Hongling Zhang1,2,3, Yuming Dong1,2, Lili Pei1,2, Honghui Liu1,2, Junsheng Jiang4, Hongbin Xu1,2,3   

  1. 1 CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 RH Mining Resources Limited, Hong Kong, China
  • Received:2019-12-27 Revised:2020-07-23 Online:2021-06-19 Published:2021-04-28
  • Contact: Hongling Zhang
  • Supported by:
    The financial supports from Dunhuang Sunshine Zhaojin Mining Co., Ltd. and RH Mining Resources Ltd. are gratefully acknowledged.

Investigation on the fabrication of lightweight aggregate with acid-leaching tailings of vanadium-bearing stone coal minerals and red mud

Chunguang Song1,2,3, Hongling Zhang1,2,3, Yuming Dong1,2, Lili Pei1,2, Honghui Liu1,2, Junsheng Jiang4, Hongbin Xu1,2,3   

  1. 1 CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 RH Mining Resources Limited, Hong Kong, China
  • 通讯作者: Hongling Zhang
  • 基金资助:
    The financial supports from Dunhuang Sunshine Zhaojin Mining Co., Ltd. and RH Mining Resources Ltd. are gratefully acknowledged.

Abstract: Proper treatment of acid-leaching tailings (ALTs) of vanadium-bearing stone coal minerals is of great urgency. One approach is adding it into the raw materials during the preparation of lightweight aggregate (LWA). But clay is always needed. In this paper, another solid waste, red mud, was mixed with ALTs as a source of flux components instead of clay. Evaluation of the physical characteristics, morphological structures, as well as crystal phases during the sintering process were investigated. When their mixtures with a proper ratio were sintered at 1080℃, a glassy phase with certain viscosity was formed, and the gases generated simultaneously were encapsulated by the melt. Finally, LWA with a one-hour water absorption as low as 1.46%, a bulk density as low as 728.76 kg·m-3 and a compressive strength as high as 10.77 MPa was fabricated.

Key words: Acid-leaching tailings, Red mud, Waste treatment, Sintering, Preparation, Lightweight aggregate

摘要: Proper treatment of acid-leaching tailings (ALTs) of vanadium-bearing stone coal minerals is of great urgency. One approach is adding it into the raw materials during the preparation of lightweight aggregate (LWA). But clay is always needed. In this paper, another solid waste, red mud, was mixed with ALTs as a source of flux components instead of clay. Evaluation of the physical characteristics, morphological structures, as well as crystal phases during the sintering process were investigated. When their mixtures with a proper ratio were sintered at 1080℃, a glassy phase with certain viscosity was formed, and the gases generated simultaneously were encapsulated by the melt. Finally, LWA with a one-hour water absorption as low as 1.46%, a bulk density as low as 728.76 kg·m-3 and a compressive strength as high as 10.77 MPa was fabricated.

关键词: Acid-leaching tailings, Red mud, Waste treatment, Sintering, Preparation, Lightweight aggregate