工程科学学报，第40卷，第8期：918-924,2018年8月 Chinese Journal of Engineering,Vol.40,No.8:918-924,August 2018 DOI:10.13374/j.issn2095-9389.2018.08.004;http://journals.ustb.edu.cn 泵送剂对高含泥膏体流变特性影响及机理 张连富2)，吴爱祥12)，王洪江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 ☒通信作者，E-mail:wuaixiang(@126.com 摘要高含泥尾矿由于其屈服应力大的特点，流动性能差，不利于管道输送.为改善流动性能，设计流变特性试验，对泵送 剂影响高含泥膏体流变特性的机理进行分析·研究结果表明，膏体在不同泵送剂添加量情况下，浆体质量分数与屈服应力之 间存在显著的线性关系.对该线性函数作进一步分析，发现泵送剂添加量与该函数的截距和斜率之间存在显著的指数关系. 最终得出不同泵送剂添加量和浆体质量分数情况下的屈服应力预测函数，能够有效表征泵送剂对高含泥膏体流变特性的影 响，有利于泵送剂添加量的预测与膏体流动性能的控制.基于上述预测模型，提出泵送剂对高含泥膏体流变特性的影响机理. 通过环境扫描电镜(SEM)发现泵送剂破坏了絮团结构，添加量在1%左右时破坏最明显.泵送剂使得絮团尺寸变小，进而造 成屈服应力的降低：后期由于絮团间距增加，絮团间的作用力削弱，絮团结构破坏速度放缓，与理论分析一致. 关键词高含泥：膏体输送：泵送剂：流变特性：絮团 分类号TD853 Effects and mechanism of pumping agent on rheological properties of highly muddy paste ZHANG Lian-fu),WU Ai-xiang),WANG Hong-jiang) 1)School of Civil and Resource Engineering.University of Science and Technology Beijing.Beijing 100083.China 2)Key Laboratory of Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,Beijing 100083,China Corresponding author,E-mail:wuaixiang@126.com ABSTRACT Paste backfilling technology,by which tailings paste is transported into underground stopes,does not only relieve the environmental pressure caused by increasing volumes of tailings ponds,but also averts the potential dangers of underground goaf.How- ever,because of the complex characteristics of some mine tailings,it is challenging to adopt the paste backfilling technology for tailings disposal,as the pipeline transportation of highly muddy pastes is difficult because of the poor flowability caused by high yield stress.To improve the flowability of tailings pastes,a rheological experimental setup have been designed to investigate the mechanism of how pum- ping agents affect the rheological properties of a highly muddy paste.The results show that a significant linear relationship exists be- tween the tailings paste concentration and corresponding yield stress,with different pumping agent dosages.Further analysis reveals a significant exponential relationship between pumping agent dosage and slope (or intercept)of the linear function.Finally,the predic- tion function for the yield stress is proposed,considering the pumping agent dosage and tailings paste concentration.This can charac- terize how the pumping agent influences the rheological properties of a highly muddy paste and enable precise forecasting of the pumping agent dosage and management of slurry flowability.Based on the prediction model,the effect mechanism of pumping agent on a highly muddy tailings paste rheology is proposed.Based on the analysis of the images observed from an environmental scanning electron micro- scope (ESEM),it is found that the presence of pumping agent causes the destruction of flocs in tailings pastes.Meanwhile,the opti- mal dosage of pumping agent suggested by experiments is about 1%.Furthermore,the pumping agent accounts for floc size shrinkage and consequently yield stress reduction.Moreover,increasing the distance between broken flocs weakens their interactions and slows down the flocs destruction rate.The observations agree with the theoretical analysis results. KEY WORDS high-mud;paste transport;pumping agent;rheological property;flocs 收稿日期：2017-08-16 基金项目：国家重点研发计划资助项目(2017YFC0602903):国家自然科学基金资助项目(51574013)工程科学学报,第 40 卷,第 8 期:918鄄鄄924,2018 年 8 月 Chinese Journal of Engineering, Vol. 40, No. 8: 918鄄鄄924, August 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 08. 004; http: / / journals. ustb. edu. cn 泵送剂对高含泥膏体流变特性影响及机理 张连富1,2) , 吴爱祥1,2) 苣 , 王洪江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 苣 通信作者, E鄄mail: wuaixiang@ 126. com 摘 要 高含泥尾矿由于其屈服应力大的特点,流动性能差,不利于管道输送. 为改善流动性能,设计流变特性试验,对泵送 剂影响高含泥膏体流变特性的机理进行分析. 研究结果表明,膏体在不同泵送剂添加量情况下,浆体质量分数与屈服应力之 间存在显著的线性关系. 对该线性函数作进一步分析,发现泵送剂添加量与该函数的截距和斜率之间存在显著的指数关系. 最终得出不同泵送剂添加量和浆体质量分数情况下的屈服应力预测函数,能够有效表征泵送剂对高含泥膏体流变特性的影 响,有利于泵送剂添加量的预测与膏体流动性能的控制. 基于上述预测模型,提出泵送剂对高含泥膏体流变特性的影响机理. 通过环境扫描电镜(ESEM)发现泵送剂破坏了絮团结构,添加量在 1% 左右时破坏最明显. 泵送剂使得絮团尺寸变小,进而造 成屈服应力的降低;后期由于絮团间距增加,絮团间的作用力削弱,絮团结构破坏速度放缓,与理论分析一致. 关键词 高含泥; 膏体输送; 泵送剂; 流变特性; 絮团 分类号 TD853 收稿日期: 2017鄄鄄08鄄鄄16 基金项目: 国家重点研发计划资助项目(2017YFC0602903);国家自然科学基金资助项目(51574013) Effects and mechanism of pumping agent on rheological properties of highly muddy paste ZHANG Lian鄄fu 1,2) , WU Ai鄄xiang 1,2) 苣 , WANG Hong鄄jiang 1,2) 1) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Key Laboratory of Ministry of Education of China for High鄄Efficient Mining and Safety of Metal Mines, Beijing 100083, China 苣 Corresponding author, E鄄mail: wuaixiang@ 126. com ABSTRACT Paste backfilling technology, by which tailings paste is transported into underground stopes, does not only relieve the environmental pressure caused by increasing volumes of tailings ponds, but also averts the potential dangers of underground goaf. How鄄 ever, because of the complex characteristics of some mine tailings, it is challenging to adopt the paste backfilling technology for tailings disposal, as the pipeline transportation of highly muddy pastes is difficult because of the poor flowability caused by high yield stress. To improve the flowability of tailings pastes, a rheological experimental setup have been designed to investigate the mechanism of how pum鄄 ping agents affect the rheological properties of a highly muddy paste. The results show that a significant linear relationship exists be鄄 tween the tailings paste concentration and corresponding yield stress, with different pumping agent dosages. Further analysis reveals a significant exponential relationship between pumping agent dosage and slope (or intercept) of the linear function. Finally, the predic鄄 tion function for the yield stress is proposed, considering the pumping agent dosage and tailings paste concentration. This can charac鄄 terize how the pumping agent influences the rheological properties of a highly muddy paste and enable precise forecasting of the pumping agent dosage and management of slurry flowability. Based on the prediction model, the effect mechanism of pumping agent on a highly muddy tailings paste rheology is proposed. Based on the analysis of the images observed from an environmental scanning electron micro鄄 scope (ESEM), it is found that the presence of pumping agent causes the destruction of flocs in tailings pastes. Meanwhile, the opti鄄 mal dosage of pumping agent suggested by experiments is about 1% . Furthermore, the pumping agent accounts for floc size shrinkage and consequently yield stress reduction. Moreover, increasing the distance between broken flocs weakens their interactions and slows down the flocs destruction rate. The observations agree with the theoretical analysis results. KEY WORDS high鄄mud; paste transport; pumping agent; rheological property; flocs