title: A practice of ultra-fine tailings disposal as filling material in a gold mine.
abstract: A practice of cemented backfill technology with ultra-fine tailings in a gold mine was comprehensively presented, and a series of tests were conducted in accordance with the peculiar properties of ultra-fine tailings and the mining technology conditions. The test results show that, the tailings from Shuiyindong Gold Mine have a great grinding fineness, with the average particle diameter 22.03 μm, in which the ultra-fine particles with the diameter below 20 μm occupying 66.13%. The analysis results of chemical components of tailings indicate that the content of SiO2is relatively low, i.e., 33.08%, but the total content of CaO, MgO and Al2O3is relatively high i.e., 36.5%. After the settlement of 4-6 h, the tailing slurry with the initial concentration of 40% has the maximum settling concentration of 54.692%, and the corresponding maximum settling unit weight is 1.497 g/cm3. During the field application, the ultra-fine tailings and PC32.5 cement were mixed with the cement-tailings ratios of 1:3-1:8, and the slurry concentration of 50 wt% was prepared. Using the slurry pump, the prepared cemented backfill slurries flowed into the goaf, and then the strength of the cemented backfill body met the mining technique requirements in Shuiyindong Gold Mine, where the ore body has a smooth occurrence, with the average thickness of approximately 2 m and the inclination angle ranging from 5 to 10°.
authors.affiliation: Institute of Mining Engineering, Guizhou Institute of Technology, Guiyang, Guizhou, 550003, China. Electronic address: ustbb20070025@126.com.
authors.forename: D Q
authors.initials: DQ
authors.lastname: Deng
authors.affiliation: Energy School, Xi'an University of Science and Technology, Xi'an, 710054, China; Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi'an, 710054, China. Electronic address: csuliulang@163.com.
authors.forename: L
authors.initials: L
authors.lastname: Liu
authors.affiliation: Changsha Institute of Mining Research, 410012, Changsha, China. Electronic address: spring_xue@163.com.
authors.forename: Z L
authors.initials: ZL
authors.lastname: Yao
authors.affiliation: Dept. of Civil Engineering, Inha University, Incheon, 402-751, South Korea. Electronic address: ksong@inha.ac.kr.
authors.forename: K I-I L
authors.initials: KIL
authors.lastname: Song
authors.affiliation: School of Civil and Resource Engineering, University of Western Australia, Perth, Western Australia, 6009, Australia. Electronic address: lao@civil.uwa.edu.au.
authors.forename: D Z
authors.initials: DZ
authors.lastname: Lao
mesh_terms: D006046:Gold; D008906:Mining; D012037:Refuse Disposal; D012822:Silicon Dioxide
chemical_list: D006046:Gold; D012822:Silicon Dioxide
keywords: Cemented backfill station; Cemented backfill technology; Ultra-fine tailings; Viscous state