Mechanical Properties of Clinker-free Consolidated Body of Iron Tailing Powders Regulated Synergistically by Gypsum Component and Micro-Nano Structure
LIU Juanhong1,2,3,*, AN Shuhao1, CHEN Deping1, ZHANG Yueyue1
1 College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Research Institute of Urbanization and Urban Safety, University of Science and Technology Beijing, Beijing 100083, China 3 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract: In order to explore the hydration and solidification mechanism and regulation factors of amorphous SiO2 and Al2O3 on particle surfaces of ultrafine iron tailing powder in lime-gypsum system, this work investigated the influence of the matching between the gypsum's doping amount and the iron tailing powders' micro-nano particle content on strength of the consolidated body. The evolution of chemical species, morphologies and contents of hydration products in several samples of consolidated body of were tested and analyzed by means of XRD, TG-DSC, SEM and chemical titration, and their impacts on strength of the consolidated body and the corresponding underlying mechanisms were studied. The results showed that the content of micro-nano particles smaller than 1.096 μm in the ultra-fine iron tailing powder significantly affected the dissolution behavior of SiO2 and Al2O3 components in the alkaline solution, and the increase of this content resulted in improved strength of the consolidated body. The main hydration products in the consolidated body were aluminum-doped calcium silicate hydrate (C-(A)-S-H) and ettringite (AFt). The best matching value between gypsum content and micro-nano iron tailings powder content had a significant impact on the strength of the consolidated body, and the required optimal amount of gypsum addition varied directly proportional with the content of micro-nano particles. Gypsum component not only ensured the formation and stability of AFt, but also accelerated the hydration of amorphous components on surfaces of tailing powder particles. This study clarified the relationship between the optimal gypsum doping amount and micro-nano tailing particle content in the consolidated material and its underlying origins. It could be confirmed that the micro-nano particles are the basic active units in the structure of the non-clinker consolidated body. The hydration process of these micro-nano particles of tailing powders is regulated by the addition of gypsum, and makes the micro-nano particles become the basic structural units of the consolidated body. This ‘dual-gene’ regulation mechanism of both composition and structure affects the mechanical properties of the consolidated body.
刘娟红, 安树好, 陈德平, 张月月. 融合石膏组分和微纳米结构“双基因”调控的铁尾矿粉无熟料固结体力学性能[J]. 材料导报, 2024, 38(21): 23010110-10.
LIU Juanhong, AN Shuhao, CHEN Deping, ZHANG Yueyue. Mechanical Properties of Clinker-free Consolidated Body of Iron Tailing Powders Regulated Synergistically by Gypsum Component and Micro-Nano Structure. Materials Reports, 2024, 38(21): 23010110-10.
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2024, Vol. 38 
