摘要
本文针对国内某铜矿下向进路充填开采工艺,以满足回采所需充填体强度需求为目标,通过对不同级配骨料制备的充填料浆开展流动性试验及强度配比试验,揭示出充填浓度是影响充填料浆流动性能的主要因素,且充填料浆中增加粗骨料含量能够提高充填料浆输送浓度,同时能够提高各龄期充填体强度;并结合下向进路充填采矿工艺要求,确定了全尾砂充填料浆最佳输送浓度为68%~72%;尾砂∶破碎废石=6∶4条件下,最佳输送浓度为72%~76%;尾砂∶破碎废石=4∶6条件下,最佳输送浓度为74%~78%;最终综合分析推荐下向进路充填工艺参数为:假底充填∶尾砂∶碎石=4∶6~6∶4、充填浓度76%、灰砂比=1∶4;接顶充填∶尾砂∶碎石=4∶6~6∶4、充填浓度76%、灰砂比=1∶8。
A domestic copper mine adopts the underhand drift cut-and-fill stoping technology.To meet the strength requirements of cemented backfilling during the mining process,the fluidity tests and strength ratio tests are carried out on the backfilling slurry prepared with aggregates of different gradations.It is revealed that the backfilling concentration is the main factor affecting the flow performance of the backfilling slurry.Moreover,increasing the content of coarse aggregates can enhance the transportation concentration of the backfilling slurry,and simultaneously improve the strength of cemented backfilling.Combined with the requirements of the underhand drift cut-and-fill stoping process,the optimal transportation concentration of the backfilling slurry for the tailings is determined to be between 68%and 72%.When the tailings-crushed stones ratio is 6∶4,the optimal transportation concentration is between 72%and 76%.When the tailings-crushed stones ratio is 4∶6,the optimal transportation concentration is between 74%and 78%.Based on the comprehensive analysis results,the backfilling parameters of the underhand drift cut-and-fill stoping are recommended.For the bottom layer,the tailings-crushed stones ratio is 4∶6 to 6∶4,the backfilling concentration is 76%,and the ash-sand ratio is 1∶4.For the top layer,the tailings-crushed stones ratio is 4∶6 to 6∶4,the backfilling concentration is 76%,and the ash-sand ratio is 1∶8.
作者
韩汝宁
郭利杰
董峰
杨超
HAN Runing;GUO Lijie;DONG Feng;YANG Chao(HTL Mining Development Co.,Ltd.,Lasa 851400,China;BGRIMM Technology Group,Beijing 102628,China;National Centre for International Research on Green Metal Mining,Beijing 102628,China;Fujian Zhenghe County Yuanxin Mining Co.,Ltd.,Zhenghe 353601,China)
出处
《中国矿业》
北大核心
2025年第S1期439-444,共6页
China Mining Magazine
基金
国家科技重大专项资助(编号:2024ZD1003705)。
关键词
下向进路采矿法
充填体强度
充填工艺参数
充填骨料
骨料级配
underhand drift cut-and-fill stoping
strength of cemented backfilling
backfilling process parameters
backfilling aggregate
aggregate gradation
