超细全尾砂似膏体长距离自流输送的时变特性  

Time-Varying Characteristic of Paste-like Super-Fine Unclassified Tailings in Long Self-Flowing Transportation

作　　者：李帅[1] 王新民[1] 张钦礼[1] 王石[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《东北大学学报（自然科学版）》2016年第7期1045-1049,1060,共6页Journal of Northeastern University(Natural Science)

基　　金：国家科技支撑计划项目(2013BAB02B05);中南大学中央高校基本科研业务费专项资金资助项目(2015zzts078)

摘　　要：基于H-B流变模型和絮网结构理论,构建了考虑时变性的超细全尾砂似膏体流变模型,探究超细全尾砂似膏体长距离管道自流输送过程中的时变特性,推导了相应的管输阻力计算公式.以某深井铁矿质量分数为68%的超细全尾砂似膏体为例,进行了室内剪切试验和管输阻力计算.结果表明:不同剪切速率下的超细全尾砂似膏体表现出剪切稀化的时变特性,且剪切速率越大,达到平衡状态的时间越短,黏度值越低.在流量为80 m3/h时,管输阻力经225 s降至稳定状态的5.03 M Pa/km,为初始阻力的50.6%.超细全尾砂似膏体长距离自流输送过程中,以稳定状态的阻力损失进行计算更为经济合理.A time-dependent rheological model was built based on the H - B rheological model and theslurry flocculent structure theory. Time-varying characteristic of paste-like super-fine unclassifiedtailings in long self-flowing transportation was explored,and the friction loss formula of pipes wasderived. By using the 6 8 % mass concentration paste-like slurry of a deep iron mine, groups of shearrheological tests were implemented, and the pipes friction loss was verified. It is revealed that thepaste-like super-fine unclassified tailings show obvious shear thinning under different shear rate. Thehigher the shear rate is, the faster the balance can be reached and the lower the viscosity is. With aflow of 80 m 3/ h ,the friction loss takes 225 s to reach a stable value of 5.03 M Pa / km ,which is just5 0 . 6 % of the initial resistance. Therefore, it is quite economic and reasonable to calculate the frictionloss of paste-like slurry by using the stable value in long distance pipeline transportation.

关 键 词：时变特性 H-B流变模型 絮网结构理论 管输阻力损失 剪切稀化 

分 类 号：TD05[矿业工程]