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/m^(3)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。
The downward layered approach cemented filling mining method was selected in Jinchuan nickel deposit,but there is a problem of high filling cost and low production capacity.In order to reduce the cost of filling mining,the industrial filling test of waste rock and tailing mixed aggregate was carried out based on a large number of laboratory studies.Firstly,the particle size analysis and grading study of the-16 mm waste rock coarse aggregate and dressing tailings fine aggregate were carried out.The results show that the diameters of the two kinds of aggregate belong to filling aggregate with discontinuous distribution and poor gradation.According to the different ratios of the two kinds of aggregate,the compactness test of the mixed aggregate was carried out,and the relationship curve between the ratio of waste rock tailings of the mixed aggregate and the compactness was established,so as to determine the optimal ratio of the mixed aggregate when the compactness reached the maximum.The research results show that when the ratio of-16 mm waste rock and dressing tailings is within the range of 7∶3 to 5∶5,the density of mixed aggregate accumulation reaches or approaches the maximum,and the corresponding ratio of mixed aggregate particle size is continuously graded.Then,the industrial filling test was carried out for the mixed aggregate with the ratio of waste rock and tailing of 6∶4 and 5∶5,thus obtaining the strength of the cemented backfill with the mixed aggregate of the two ratios.The test results show that when the cement content is 260 kg/m3,the strength of cemented backfill of the two kinds of mixed aggregate meets the strength requirements of cemented backfill in the downward layered approach and cemented filling mining method in Jinchuan mine,and the strength of the mixed aggregate cementing backfill in the ratio of 6∶4 is higher than that of the mixed aggregate cementing backfill in the ratio of 5∶5.According to the observation on the fracture surface of the cementing backfill test block,when a s
作者
何建元
李宏业
高谦
尹升华
HE Jianyuan;LI Hongye;GAO Qian;YIN Shenghua(Jinchuan Group Co.,Ltd.,Jinchang 737100,Gansu,China;School of Civil and Resource Engineering,University of Science and Technology of Beijing,Beijing 100083,China)
出处
《黄金科学技术》
CSCD
2021年第4期564-572,共9页
Gold Science and Technology
基金
国家重点研发计划重点专项“深部金属矿高效协同膏体充填技术”(编号:2017YFC06022903)资助。
关键词
废石—尾砂
混合骨料
粒径级配
下向分层进路胶结充填采矿法
工业试验
充填体质量
waste rock and tailing
mixed aggregate
particle size and grading
downward slicing and filling mining method
industrial test
backfill mass
