黄金科学技术 ›› 2021, Vol. 29 ›› Issue (4): 564-572.doi: 10.11872/j.issn.1005-2518.2021.04.188
摘要:
为了降低金川矿山充填采矿成本,针对下向分层进路胶结充填采矿法,开展了废石—尾砂混合骨料现场工业充填试验。对废石和尾砂进行了粒度分析与级配研究,选取合适的废石—尾砂配比混合骨料开展现场工业充填试验研究。结果表明:-16 mm废石粗骨料和选矿尾砂细骨料的配比在5∶5~7∶3范围内,此时混合骨料的堆积密实度达到或接近于最大;对于废石与尾砂配比为6∶4和5∶5的混合骨料,当水泥添加量为260 kg/m3时,2种配比的混合骨料的胶结充填体强度均满足金川矿山充填法采矿的胶结体强度要求;采用一段搅拌时废石—尾砂混合骨料充填料浆搅拌不均匀,水泥和尾砂存在结团现象,导致胶结充填体均质性较差,整体稳定性较低,因此,废石—尾砂混合骨料的充填料浆需要采取二段活化搅拌来提高胶结充填体整体质量;对混合骨料充填料浆配比的精确控制,是影响胶结充填体强度和整体稳定性的重要因素。
中图分类号:
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