摘要
针对金川矿区粗骨料充填料浆离析问题,选择掺铜渣尾砂改善骨料级配,在混合骨料粒径级配分析基础上,进行废石-铜渣尾砂混合骨料充填体强度试验和料浆管输特性试验。试验结果表明:掺入适量铜渣尾砂,能有效改善粒径级配,提高充填体强度;铜渣尾砂添加量、胶凝材料添加量和料浆质量浓度对充填料浆管输特性的影响各不相同,但在一定范围均对料浆管输特性有益。最后以单位充填成本为优化目标,以各龄期强度和28d沉缩率为约束条件,得出满足充填强度要求的最低成本配比方案,即胶凝材料为270kg/m^3,废石为857.4kg/m^3,铜渣尾砂为423.2kg/m^3,料浆浓度为80%,水为420.2kg/m^3,此方案下的充填成本为92.6元/m^3,相比当前156元/m^3的充填成本,降低了约40.6%。验证试验结果为:3,7,28d强度和28d沉缩率分别为1.62,3.80,6.91MPa和9.23%,均满足矿山胶结充填要求。
In view of the segregation of filling slurry with coarse aggregate in Jinchuan mining area,the copper slag tailings were selected to improve the aggregate grading.Based on the analysis of the particle size grading of the mixed aggregate,the backfill strength test and the pipe transportation characteristics test were carried out on the waste rock and copper slag tailings.The test results showed that adding appropriate amount of copper slag tailings can effectively improve the particle size distribution and backfill strength.The amount of copper slag tailings,the amount of cementitious materials and the mass concentration of slurry had different effects on the pipe transportation characteristics of the filling slurry,but they all had positive effects in a certain range.Finally,taking the unit filling cost as the optimization objective,as well as the strength of each age and the shrinkage rate in 28 days as the constraint conditions,the scheme meeting the backfill strength requirements was obtained with the lowest cost,that was,270 kg/m^3 of cementitious material,857.4 kg/m^3 of waste rock,423.2 kg/m^3 of copper slag tailings,80%of slurry concentration and 420.2 kg/m^3 of water.Under this scheme,the filling cost was 92.6 RMB/m^3,which was 40.6%lower than the current 156 RMB/m^3.The results of the verification tests showed that the backfill strength in 3,7 and 28 days was 1.62,3.80,6.91 MPa,respectively,and the subsidence rate in 28 days was 9.23%,which met the requirements of cemented filling in this mine.
作者
巴蕾
韦寒波
温震江
高谦
王永定
BA Lei;WEI Hanbo;WEN Zhenjiang;GAO Qian;WANG Yongding(Key Laboratory of High-Efficient Mining and Safety of Metal Mine,Ministry of Education,USTB Beijing,Beijing 100083,China;Ordos Vocational College,Ordos,Inner Mongolia 017000,China;Jinchuan Group Co.,Ltd,Jinchang,Gansu 737100,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第2期31-37,共7页
Mining Research and Development
基金
国家重点研发计划重点专项项目(2017YFC0602903)
关键词
废石
铜渣尾砂
配比
充填体强度
充填成本
Filling slurry segregation
Copper slag tailings
Mixed aggregate
Backfill strength
Filling cost
