摘要
针对山东某金矿充填料浆保水性差、离析泌水现象严重、充填体强度低等问题,通过分析尾砂物理化学性质,采用三因素五水平正交设计,以水泥掺量、料浆浓度和砂灰比为研究对象,充填料浆塌落度和充填体抗压强度为考察指标,开展全尾砂高浓度膏体充填试验研究。试验结果表明:料浆浓度是影响充填料浆塌落度的主要因素,水泥掺量次之,砂灰比影响最小;各因素对充填体3d和7d抗压强度影响重要性的排序为水泥掺量>砂灰比>料浆浓度。当水泥掺量为30%,料浆浓度在70%~72%区间内,砂灰比为6时,充填料浆塌落度为28.2cm^28.4cm,料浆流动性好,可实现管道自流输送,充填体3d抗压强度为0.63 MPa^0.68MPa,7d抗压强度为1.03 MPa^1.09 MPa,可满足矿山的充填需求。
Aiming at the problems of poor water retention,serious segregation and bleeding phenomenon and low strength of filling body in a gold mine in Shandong Province,through analyzing the physical and chemical properties of tailings,the full tailings backfill test with high concentrations of paste was carried out.In this test,three factors and five levels orthogonal design was adopted,the cement content,slurry concentration and sand cement ratio were taken as the research object,and the slump of filling slurry and compressive strength of filling body were taken as the investigation indexes.The results show that the slurry concentration is the main factor affecting the slump of filling slurry,followed by the cement content and then the sand-cement ratio.The influence order of each factor on the compressive strength in 3 days and 7 days is cement content>sandcement ratio>slurry concentration.When the cement content is 30%,the slurry concentration is in the range of 70%~72%,and the sand-cement ratio is 6,the slump of the filling slurry is 28.2 cm^28.4 cm,the slurry fluidity is good,and the pipeline gravity transportation can be realized.The compressive strength of the filling body in 3 days is 0.63 MPa^0.68 MPa,and that in 7 days is 1.03 MPa^1.09 MPa,which can meet the filling requirements of the mine.
作者
刘树龙
刘国磊
李公成
王劼
王发刚
齐兆军
杨纪光
LIU Shulong;LIU Guolei;LI Gongcheng;WANG Jie;WANG Fagang;QI Zhaojun;YANG Jiguang(School of Materials Science and Engineering,Shandong University of Technology,Zibo,Shandong 255049,China;College of Resources and Environmental Engineering,Shandong University of Technology,Zibo,Shandong 255049,China;Filling Engineering Laboratory Branch,Shandong Gold Mining Technology Co.,Ltd,Laizhou,Shandong 261400,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第12期33-37,共5页
Mining Research and Development
基金
国家自然科学基金青年项目(5200452)
山东省自然科学基金项目(ZR201910230046)。
关键词
尾砂
膏体
塌落度
抗压强度
正交设计
极差分析
Tailings
Paste
Slump
Compressive strength
Orthogonal design
Range analysis
