Department of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China.
J Hazard Mater. 2010 Feb 15;174(1-3):78-83. doi: 10.1016/j.jhazmat.2009.09.019. Epub 2009 Sep 11.
In order to comprehensive utilization of iron ore tailings, this experimental research was to investigate the possibility of using the residues after iron recovery from iron ore tailings as raw materials for the preparation of cementitious material, abbreviated as TSC, including analyses of its mechanical properties, physical properties and hydration products. The TSC1 was prepared by blending 30% the residues, 34% blast-furnace slag, 30% clinker and 6% gypsum. Meanwhile, the raw iron ore tailings (before iron recovery) with the same proportion of TSC1 were selected to compare the cementitious activity of raw tailings and the residues after magnetizing roasting, denoted by TSC0. The hydration products of them were mostly ettringite, calcium hydroxide and C-S-H gel, characterized by XRD, IR and SEM. It was found that ettringite and C-S-H gel were principally responsible for the strength development of TSC mortars with curing time. The results showed that the kaolinite of the tailings was decomposed completely after magnetizing roasting, which promoted the cementitious property of TSC1. Moreover, the mechanical properties of TSC1 are well comparable with those of 42.5 ordinary Portland cement according to Chinese GB175-2007 standard.
为了综合利用铁尾矿，本实验研究旨在探讨从铁尾矿中回收铁后的残渣作为制备胶凝材料（简称 TSC）的原料的可能性，包括对其力学性能、物理性能和水化产物进行分析。TSC1 是由 30%残渣、34%高炉矿渣、30%熟料和 6%石膏混合而成。同时，选取同样比例的原始铁尾矿（未回收铁前）与 TSC1 进行比较，以研究磁化焙烧后原始尾矿和残渣的胶凝活性，分别表示为 TSC0。通过 XRD、IR 和 SEM 对它们的水化产物进行了表征，结果表明，水化产物主要为钙矾石、氢氧化钙和 C-S-H 凝胶，它们是 TSC 砂浆强度发展的主要原因。结果表明，磁化焙烧后尾矿中的高岭石完全分解，这促进了 TSC1 的胶凝性能。此外，根据中国 GB175-2007 标准，TSC1 的力学性能与 42.5 普通硅酸盐水泥相当。
