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Early-age strength property improvement and stability analysis of unclassified tailing paste backfill materials
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-09-05 , DOI: 10.1007/s12613-020-1977-4
Qian Zhou , Juan-hong Liu , Ai-xiang Wu , Hong-jiang Wang

High-density tailings, small cementitious materials, and additives are used for backfill materials with poor early compressive strength (ECS), which may greatly affect the mining and backfill cycle, to prepare paste backfill materials (PBMs) with a high ECS. The effects and mechanisms of different early strength agents on the property of PBM are investigated. The action mechanism of additives on the properties of PBM is also analyzed through X-ray diffraction, scanning electron microscope, and energy dispersive spectrometry. Results show that the effects of single-component additives 1, 3, and 6 are better than those of the other additives, and their optimal dosages are 3wt%, 1wt%, and 3wt%, respectively. The optimum multicomponent combinations are 1wt% of additive 1 and 1.5wt% of additive 6. The ECS of the paste with additive 10 increases to a greater extent than that of the other pastes because of the synergistic action of additive 1 with additive 6. The hydration product of Ca(OH)2 is consumed, and more C-S-H gels are generated with the addition of additives to paste. Tailings particles, ettringite crystals, and gels intertwined with one another form a dense net-like structure that fills the pores. This structure can significantly improve the ECS of PBM.



中文翻译:

未分类尾矿浆回填材料的早期强度性能改进和稳定性分析

高密度尾矿,小的水泥材料和添加剂用于早期抗压强度(ECS)较差的回填材料,这可能会极大地影响采矿和回填周期,从而制备出具有高ECS的糊状回填材料(PBM)。研究了不同早期强度剂对PBM性能的影响及其机理。还通过X射线衍射,扫描电子显微镜和能量色散光谱分析了添加剂对PBM性能的作用机理。结果表明,单组分添加剂1、3和6的效果优于其他添加剂,其最佳用量分别为3wt%,1wt%和3wt%。最佳的多组分组合是添加剂1的1wt%和添加剂6的1.5wt%。2被消耗掉了,在糊剂中添加了添加剂会生成更多的CSH凝胶。尾矿颗粒,钙矾石晶体和凝胶相互缠绕在一起,形成了一个密集的网状结构,充满了孔。这种结构可以显着改善PBM的ECS。

更新日期:2020-09-06
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