多级配锥柱体介质应用于SAB流程中的球磨机仿真及试验
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摘要
针对铜陵有色冬瓜山SAB流程中球磨机磨矿产品均匀性差的问题,从矿石力学性质、磨矿循环粒分析、磨矿对比试验和离散元仿真,对锥柱体介质应用于球磨机进行了试验。试验结果得出,该铜矿石属于容重较大、韧性和脆性分布不均的矿石,磨矿需兼顾冲击和磨剥作用;仿真结果说明多级配锥柱体在处理不同粒度难磨矿石时,在切向碰撞能量分布上存在明显的优势,表现出较好的研磨能力;磨矿对比试验得出多级配锥柱体介质的磨矿产品+0. 15 mm和-0. 010 mm产率比现场方案分别降低了55. 71%和9. 87%,磨矿细度(-0. 074 mm)和(-0. 15+0. 010) mm中间易选级别产率分别提高了16. 52%、17. 61%;现场应用锥柱体介质后溢流中+0. 15 mm含量降低了14. 36%,-0. 074mm含量提高了8. 06%;旋流器分级量效率与质效率分别提高19. 13%、17. 46%;磨矿介质单耗降低0. 198 kg/t;铜回收率提高1. 10%。
A systematic research on the mechanical properties and product size characteristics of Tongling nonferrous Dongguashan Copper was conducted and discrete element simulation and experiment research on grinding cone cylinder medium to achieve the goal of improving grinding effect in industrial test.Results of test indicate that the copper ore belongs to relatively large unit weight and the tenacity and brittleness of column are not evenly distributed,grinding need to take into account the impact and collision effect; the simulation results show that there are obvious advantages to the collision energy with broadly graded cone cylinder of grinding hard ore and have excellent grinding ability; the result of exploration experiments reveal that grinding products + 0. 15 mm and-0. 010 mm yield are decreased by 55. 71% and 9. 87% than the scheme,grinding fineness(-0. 074 mm) and intermediate easy selection level(-0. 15 + 0. 010) mm yield are increased by 16. 52% and 17. 61%. The industrial test with the application of cone cylinder medium results show that the content of + 0. 15 mm decreases14. 36% in overflow,-0. 074 mm content increases by 8. 06%; transfer efficiency and quality efficiency of cyclone are increased by 19. 13% and 17. 46%. The unit consumption of grinding media decreases by0. 198 kg/t,and the recovery of copper increases by 1. 10%.
A systematic research on the mechanical properties and product size characteristics of Tongling nonferrous Dongguashan Copper was conducted and discrete element simulation and experiment research on grinding cone cylinder medium to achieve the goal of improving grinding effect in industrial test.Results of test indicate that the copper ore belongs to relatively large unit weight and the tenacity and brittleness of column are not evenly distributed,grinding need to take into account the impact and collision effect; the simulation results show that there are obvious advantages to the collision energy with broadly graded cone cylinder of grinding hard ore and have excellent grinding ability; the result of exploration experiments reveal that grinding products + 0. 15 mm and-0. 010 mm yield are decreased by 55. 71% and 9. 87% than the scheme,grinding fineness(-0. 074 mm) and intermediate easy selection level(-0. 15 + 0. 010) mm yield are increased by 16. 52% and 17. 61%. The industrial test with the application of cone cylinder medium results show that the content of + 0. 15 mm decreases14. 36% in overflow,-0. 074 mm content increases by 8. 06%; transfer efficiency and quality efficiency of cyclone are increased by 19. 13% and 17. 46%. The unit consumption of grinding media decreases by0. 198 kg/t,and the recovery of copper increases by 1. 10%.
引文
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[3]钟晋,郭永杰,杜令攀,等.球磨机磨矿介质优化试验研究[J].化工矿物与加工,2016,45(5):28-30.
[4] Massola C P,Chaves A P,Albertin E. A discussion on the measurement of grinding media wear[J]. Journal of Materials Research&Technology,2016,5(3):282-288.
[5] Azizi A,Shafaei S Z,Rooki R. Wear rate prediction of grinding media using BPNN and MLR models in grinding of sulphide ores[J]. Iranian Journal of Materials Science&Engineering,2016,13(2):73-84.
[6]凌永发,段希祥.细磨介质形状的选择及应用研究[J].有色金属(选矿部分),2001,53(6):41-44.
[7] Jankovic A,Wills T,Dikmen S. A comparison of wear rates of ball mill grinding media[J]. Journal of Mining and Metallurgy,2016,52(1):1-10.
[8]肖庆飞,石贵明,段希祥.新型细磨介质的材质选择及应用研究[J].矿冶,2006,15(1):15-17.
[9] Chen Y,Song Y S,Li W J,et al. The effect of grinding media on the flotation of fine chalcopyrite[C]. International Conference on Advanced Design and Manufacturing Engineering,2015.
[10]李妙玲,陈智勇,赵红霞,等.轻质研磨介质对球磨机研磨效率影响分析[J].矿山机械,2017,45(1):41-44.
[11] Harder J. Energy trend:advances in fine grinding and classification[J]. Aufbereitungs-Technik/Mineral Processing,2015,56(1):42-55.
[12] Wang Y,Forssberg E. Enhancement of energy efficiency for mechanical production of fine and ultra-fine particles in comminution[J].Particuology,2007,5(3):193-201.
[13] Little L,Mainza A N,Becker M,et al. Fine grinding:how mill type affects particle shape characteristics and mineral liberation[J]. Minerals Engineering,2017,111(9):148-157.
[14]肖庆飞,杨芳,王国强.精确棒径改善磷矿磨矿粒度组成的研究[J].硅酸盐通报,2017,36(6):1875-1879.
[15]胡海祥,王盛有,范作鹏,等.一种新型磨矿介质设计与磨矿试验研究[J].有色金属科学与工程,2015,29(1):85-89.
[16]张国范,冯其明,陈启元,等.铝土矿选择性磨矿中磨矿介质的研究[J].中南大学学报(自然科学版),2004,35(4):552-556.
[17]侯英,印万忠,朱巨建,等.不同碎磨方式下紫金山金铜矿石的磨矿动力学行为[J].中南大学学报(自然科学版),2017,48(5):1127-1133.
[18] F·史,向平,雨田.圆锥柱形介质与球形磨矿介质的比较[J].国外金属矿选矿,2005,42(8):18-25.