工程科学学报Issue(2)：145-149,5.DOI:10.13374/j.issn2095-9389.2015.02.001
恒定剪切作用下全尾膏体微观结构演化特征
Microstructural evolution characteristics of an unclassified tailing paste in constant shearing
摘要
Abstract
As a plastic fluid, the morphological features of internal structure in an unclassified tailing paste closely relate to its flow properties. Studies on the evolution characteristics of internal structure during the shearing flow process have extremely important significance for analyzing flow behavior in pipeline transportation and paste preparation. In this paper, scanning electron microscopy was used to investigate the meso-structure images of the paste at different mixing time. The fractal dimensions of these meso-structure images were estimated by the image processing technology and fractal theory. A structure coefficient λ was put forward to explain the morphological features of meso-structure, and a time-evolution mathematical model of meso-structure was built in the mixing process. Some related experiments were done for a lead-zinc tailing paste. It was found that the structure coefficient λ flattened out gradually after a steep fall with mixing time, and finally reached an equilibrium state. The failure coefficient and restitution coefficient in the evolution model were obtained to be 0. 171 and 0. 491 respectively by fitting experimental data.关键词
膏体/尾矿/结构演化/剪切/分形维数Key words
pastes/tailings/microstructural evolution/shearing/fractal dimension分类
矿业与冶金引用本文复制引用
吴爱祥,刘晓辉,王洪江,焦华喆,王少勇,刘斯忠,薛振林..恒定剪切作用下全尾膏体微观结构演化特征[J].工程科学学报,2015,(2):145-149,5.基金项目
“十二五”国家科技支撑计划资助项目(2012BAB08B02) （2012BAB08B02）
国家自然科学基金资助项目(51374034) （51374034）
