摘要
为了提高陕西东塘子铅锌矿矿石回采率并解决地表废石场问题,提出了碎石胶结充填采矿工艺,并开展了一系列室内充填配比优化研究。研究结果表明,浆体的塌落度存在临界点,在料浆浓度为84%之前和之后塌落度降低率分别为11.37%和52.53%(水泥∶粉煤灰∶碎石为1∶1∶16);添加剂可明显提高充填体强度,A2配比时7d和28d强度可分别提高28.78%、71.29%;充填体强度随养护时间呈对数增长;根据充填体强度和输送性能的要求,推荐矿山充填料浆浓度为82%~84%,对应塌落度为25~29cm,胶面充填采用A2配比,普通充填可采用A3、B3和D2配比,对应的7d强度分别大于1.2MPa和0.5MPa。
In order to improve the recovery rate of Dongtangzi Lead-zinc Mine in Shaanxi Province and solve the problem of waste rock field on surface,the crushed rocks cemented filling mining technology was proposed,and a series of indoor filling ratio optimization studies were carried out.The results show that there is a critical point for the slump of the slurry,and the slump reduction rate is 11.37%and 52.53%before and after the slurry concentration of 84%(cement∶fly ash∶crushed rocks=1∶1∶16).Additives can significantly improve the strength of the filling body,and the strength of the filling body in 7 d and 28 d can be increased by 28.78%and 71.29%respectively,at A2 ratio.The strength of filling body increases logarithmically with curing time.According to the requirements of backfill strength and transportation performance,it is recommended that the concentration of mine filling slurry is 82%~84%,and the corresponding slump is 25~29 cm.The A2 ratio is used for cemented filling,the A3,B3 and D2 ratios can be used for ordinary filling,and the corresponding strength in the 7 th day is greater than 1.2 MPa and 0.5 MPa respectively.
作者
张柏春
姚维
殷文峰
张要贺
黄腾龙
邓高岭
ZHANG Baichun;YAO Wei;YIN Wenfeng;ZHANG Yaohe;HUANG Tenglong;DENG Gaoling(Shaanxi Zhenao Dingsheng Mining Co.,Ltd,Baoji,Shaanxi 721707,China;Changsha Institute of Mining Research Co.,Ltd,Changsha,Hunan 410012,China;National Engineering Research Center for Metal Mining,Changsha,Hunan 410012,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第8期55-59,共5页
Mining Research and Development
关键词
上向分层充填采矿法
单轴抗压强度
料浆流动性
碎石胶结充填
配比优化
Upward layered filling mining method
Uniaxial compressive strength
Slurry fluidity
Crushed rocks cement filling
Mixing ratio optimization
