Hui Cao ^1,2* Gao Qian ^1* Xi-Zhi Zhang ^1,3* Yong-Ding Wang ^3* Aiai Wang ^1,2

• ¹ School of Civil and Resource Engineering University of Science and Technology Beijing, Beijing, China
• ² University of Science and Technology Beijing, Beijing, Beijing Municipality, China
• ³ Other, Jinchuang, China

Abstract：Jinchuan Nickel Mine is the largest large-scale copper-nickel sulfide deposit in China and the third largest in the world. Due to the deep burial of the ore body, high geostress and broken ore rock, the downward layered cementing and filling mining method with high cost and low production capacity is adopted. Jinchuan Nickel Mine uses bar milling sand as filling aggregate and cement as cementing material, and adopts pipeline autoclave conveying filling mining technology with high cement-to-sand ratio and high concentration of filling slurry, which results in high cost of filling mining and poor mining economic benefits. In order to reduce the cost of fill mining, Jinchuan Nickel Mine has carried out a series of research on low-cost fill mining technology by utilizing solid waste, such as using metallurgical slag instead of cement to develop low-cost fill cementitious material, using waste rock and bar mill sand as mixed aggregate, using waste rock and tailing sand as mixed aggregate, mixing fly ash with mixed aggregate, and mixing copper processing tailing with mixed aggregate. The strength of 3d, 7d and 28d cemented filling body of waste rock and bar mill sand reached 1.5MPa, 2.6MPa and 4.8MPa respectively; the strength of 3d, 7d and 28d cemented filling body of waste rock tailings reached 4.7MPa, 6.1MPa and 9.0MPa respectively; the strength of 3d, 7d and 28d cemented filling body of mixed fly ash reached 2.0MPa, 2.0MPa, 6.1MPa and 9.0MPa respectively. The strength of 3d, 7d and 28d doped fly ash cemented filling body reaches 2.0MPa, 2.7MPa and 5.9MPa respectively; the strength of 3d, 7d and 28d doped copper selecting tailings cemented filling body reaches 1.55MPa, 3.11MPa and 5.10MPa respectively; the strength of 3d of the early-strength type green filling cementitious material is increased to 1.73MPa; the application of cemented filling with solid waste resources in Jincheon nickel mine has been successful and has been popularized and applied in Longshou mine and the second mine area. Early-strength green filling cementitious materials and mixed aggregate paste filling technology are the research and development direction for utilization in Jinchuan nickel mine filling and mining.