工程科学学报，第40卷，第6期：673678,2018年6月 Chinese Journal of Engineering,Vol.40,No.6:673-678,June 2018 D0:10.13374/j.issn2095-9389.2018.06.004:http:/journals.ustb.edu.cm 膏体浓密机扭矩计算模型及其影响因素 王洪江2》，周 旭2)四，吴爱祥12》，王贻明2，杨柳华12) 1)北京科技大学土木与资源工程学院，北京1000832)金属矿山高效开采与安全教育部重点实验室，北京100083 3)鑫达金银开发中心，北京100038 ☒通信作者，E-mail:zhouxuo@sohu.com 摘要基于泥床料浆的非牛顿体特征，以及料浆初始剪切应力与浓度的变化规律，本文提出了耙架扭矩计算模型.模型预 测结果显示，耙架扭矩随底流浓度升高而增大，底流浓度对浓密机运行时的扭矩百分比的影响幅度可达4.67%，两者呈现为 多项式函数关系.与此同时，泥床高度对耙架扭矩影响较小，影响幅度仅为0.27%·通过某铅锌矿膏体浓密机64h运行过程 实时监测数据对比，验证了模型关于底流浓度和泥床高度对扭矩的影响规律. 关键词尾矿脱水；耙架扭矩：初始剪切应力；泥床高度：底流浓度 分类号TD853.34 Mathematical model and factors of paste thickener rake torque WANG Hongjiang'2),ZHOU Xu),WU Ai-xiang2),WANG Yi-ming),YANG Liu-hua) 1)School of Mechanics and Mineral Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Key Laboratory of High-efficient Mining and Safety of Metal Mines (Ministry of Education),Beijing 100083,China 3)Xinda Gold and Silver Development Center,Beijing 100038,China Corresponding author,E-mail:zhouxuo@sohu.com ABSTRACT In mining,cement paste backfill technology uses the high concentration tailings that remain after mineral processing to backfill underground stopes.These tailings are prepared by dewatering,mixed with a proportion of cement or other binder,then,after sufficient mixing,the saturated homogenized slurry is pumped or gravity-transported.Therefore,high concentration tailings are a pre- requisite for cement paste backfill preparation and high quality backfill.The paste thickener is a key component that shows high effi- ciency dewatering,and rake shearing greatly affects tailings dewatering performance:therefore,appropriate rake torque design is cruci- al for efficient paste thickener operation.Rake torque is a key factor in determining the dewatering extent and the rate of flocculation in the networked structure bed in the thickener compression zone.In some industry processes,the problems of rake bogging,rat holing, swirl motion,and insufficient underflow concentration can affect production or seriously damage equipment.All these problems can be attributed to poor rake design or operation.Based on the non-Newtonian characteristics of a mud bed and the correlation of slurry initial shear stress with solids concentration,a torque mathematical model was proposed.The model predicted a rake torque increase with an increase in underflow concentration during thickener operation:the percentage of rake torque variation reached 4.67%.Regression a- nalysis indicates that the percentage of rake torque presents as a polynomial function of the underflow concentration.At the same time, bed height affected rake torque slightly and the rake torque percentage varied within 0.27%when the bed height fluctuated.The pre- dicted effects of underflow concentration and bed height on rake torque are confirmed and compared with 64 h of operational data on thickener operations in a lead-zinc mine. KEY WORDS tailings dewatering;rake torque:initial shear stress:bed height;underflow concentration 收稿日期：201707-06 基金项目：国家重点研发计划资助项目(2016YFC0600709):国家自然科学基金资助项目(51574013,51374034)工程科学学报，第 40 卷，第 6 期: 673--678，2018 年 6 月 Chinese Journal of Engineering，Vol． 40，No． 6: 673--678，June 2018 DOI: 10． 13374 /j． issn2095--9389． 2018． 06． 004; http: / /journals． ustb． edu． cn 膏体浓密机扭矩计算模型及其影响因素 王洪江1，2) ，周 旭1，2，3) ，吴爱祥1，2) ，王贻明1，2) ，杨柳华1，2) 1) 北京科技大学土木与资源工程学院，北京 100083 2) 金属矿山高效开采与安全教育部重点实验室，北京 100083 3) 鑫达金银开发中心，北京 100038 通信作者，E-mail: zhouxuo@ sohu． com 摘 要 基于泥床料浆的非牛顿体特征，以及料浆初始剪切应力与浓度的变化规律，本文提出了耙架扭矩计算模型． 模型预 测结果显示，耙架扭矩随底流浓度升高而增大，底流浓度对浓密机运行时的扭矩百分比的影响幅度可达 4. 67% ，两者呈现为 多项式函数关系． 与此同时，泥床高度对耙架扭矩影响较小，影响幅度仅为 0. 27% ． 通过某铅锌矿膏体浓密机 64 h 运行过程 实时监测数据对比，验证了模型关于底流浓度和泥床高度对扭矩的影响规律． 关键词 尾矿脱水; 耙架扭矩; 初始剪切应力; 泥床高度; 底流浓度 分类号 TD853. 34 收稿日期: 2017--07--06 基金项目: 国家重点研发计划资助项目( 2016YFC0600709) ; 国家自然科学基金资助项目( 51574013，51374034) Mathematical model and factors of paste thickener rake torque WANG Hong-jiang1，2) ，ZHOU Xu1，2，3)  ，WU Ai-xiang1，2) ，WANG Yi-ming1，2) ，YANG Liu-hua1，2) 1) School of Mechanics and Mineral Ｒesources Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) Key Laboratory of High-efficient Mining and Safety of Metal Mines ( Ministry of Education) ，Beijing 100083，China 3) Xinda Gold and Silver Development Center，Beijing 100038，China Corresponding author，E-mail: zhouxuo@ sohu． com ABSTＲACT In mining，cement paste backfill technology uses the high concentration tailings that remain after mineral processing to backfill underground stopes． These tailings are prepared by dewatering，mixed with a proportion of cement or other binder，then，after sufficient mixing，the saturated homogenized slurry is pumped or gravity-transported． Therefore，high concentration tailings are a pre￾requisite for cement paste backfill preparation and high quality backfill． The paste thickener is a key component that shows high effi￾ciency dewatering，and rake shearing greatly affects tailings dewatering performance; therefore，appropriate rake torque design is cruci￾al for efficient paste thickener operation． Ｒake torque is a key factor in determining the dewatering extent and the rate of flocculation in the networked structure bed in the thickener compression zone． In some industry processes，the problems of rake bogging，rat holing， swirl motion，and insufficient underflow concentration can affect production or seriously damage equipment． All these problems can be attributed to poor rake design or operation． Based on the non-Newtonian characteristics of a mud bed and the correlation of slurry initial shear stress with solids concentration，a torque mathematical model was proposed． The model predicted a rake torque increase with an increase in underflow concentration during thickener operation; the percentage of rake torque variation reached 4. 67% ． Ｒegression a￾nalysis indicates that the percentage of rake torque presents as a polynomial function of the underflow concentration． At the same time， bed height affected rake torque slightly and the rake torque percentage varied within 0. 27% when the bed height fluctuated． The pre￾dicted effects of underflow concentration and bed height on rake torque are confirmed and compared with 64 h of operational data on thickener operations in a lead-zinc mine． KEY WOＲDS tailings dewatering; rake torque; initial shear stress; bed height; underflow concentration