摘要
针对尾矿膏体流动过程中的触变行为,将其划分为剪切破坏及静置恢复两个过程,提出以触变量Δτ、触变时间te,结构破坏系数λ,以及结构恢复系数ξ等指标对其进行定量描述.通过不同条件下的恒定剪切速率流变试验,研究了剪切速率、膏体质量分数、絮凝剂添加量、静置时间等因素对膏体触变的影响规律.结果表明,尾矿质量分数、剪切速率,以及絮凝剂添加量对膏体触变均有不同程度的促进作用;在静置条件下,膏体质量分数越高,其絮网结构恢复速率越快.对试验现象进行了解释,并探讨了其工业应用的意义.
In this paper,according to the thixotropic behavior of tailings paste in flowing process,which was classified as shear failure and stand recovery.Some indexes such as thixotropic amountΔτ,thixotropic time te,structure failure coefficientλand structure recovery coefficientξwere put forward for quantitatively describing thixotropic process.By constant shear rate rheological experiment under various conditions,the influences of shear rate,paste concentrations,the addition of flocculent and standing time for thixotropic characteristics of tailings paste were studied.The results showed that：shear rate,paste concentrations and the addition of flocculent had various degrees positive effects;the higher the concentrations of tailings paste,the faster the speed of structure recovery in standing conditions.In the end,the experiment phenomena were explained,and their respective industrial interest were discussed.
出处
《武汉理工大学学报（交通科学与工程版）》
2014年第3期539-543,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家"十二五"科技支撑计划项目(批准号:2012BAB08B02)
国家自然科学基金重点项目(批准号:50934002
51104011)资助
关键词
尾矿膏体
流变特性
触变性
絮网结构
剪切速率
tailings paste
rheological characteristics
thixotropic characteristics
flocculent structure
shear rate
