【摘要】 对不同水泥种类、水泥掺加量和浆体浓度的水泥-尾砂浆体的流动性和固化体强度的变化情况进行了实验室评价。结果表明,水泥-尾砂浆体流动性随着浆体浓度减小而改善,与掺加普通水泥的场合相比,掺加硅酸盐水泥的尾砂浆体流动性较好,水泥掺量对尾砂浆体流动性影响较小;水泥-尾砂浆体固化体的强度随水泥掺量和浆体浓度的提高而提高,与掺加普通水泥的场合相比,掺加硅酸盐水泥的尾砂固化体强度更高。在尾砂回填作业中,在充填倍线小的采场可以选择浆体浓度高掺加普通硅酸盐水泥的方案,并根据强度要求选择合适的水泥掺量;在充填倍线大的采场,在底部充填时可选择掺加普通硅酸盐水泥且浆体浓度小的方案,在上部充填时可选择掺加硅酸盐水泥的方案,并根据强度要求选择合适的水泥掺量。更多还原

【Abstract】 Laboratory investigation is made on the change in the flowability and the harden paste strength of cement-tailing paste at different types of cement, cement addition and solid content. The results show that its flowability will be improved with the decrease in solid content, the flowability of the paste to which Portland cement is added will be better than that of the paste with ordinary Portland cement and the cement amount has small effect on the flowability. The strength of the harden paste will be increased with the increase of cement amount and the solid content, and the strength of the harden paste containing Portland cement will be higher than that of the harden paste with ordinary Portland cement. In tailing back-filling operation, the scheme of high solid content, ordinary Portland cement and appropriate cement addition which is in accordance with the requirement on the strength can be selected for the stopes where there is a small ratio of horizontal distance to vertical distance of the backfilling pipeline, and for the stopes where there is a large ratio, the scheme includes a filling paste with a small solid content and ordinary Portland cement for the bottom filling, and a paste with silicate cement and appropriate cement amount that is in accordance with the requirement on the strength for the upper part filling can be selected.更多还原