CAJ | 학술논문

全尾砂膏体作为一种塑性流体，其内部结构的形貌特征与浆体流动性能紧密相关，研究剪切过程中微观结构的演化特征，对于分析膏体管道输送及制备工艺中的流动行为具有十分重要的意义.本文借助扫描电镜技术，拍摄了不同搅拌时间的膏体微观结构图像.综合应用计算机图像处理技术和分形理论，估算了膏体微结构的分形盒维数，提出以结构系数λ作为微结构形貌特征的表征指标，建立了搅拌过程中微结构时间演化过程的数学模型.某铅锌尾矿膏体相关实验的结果表明：其结构系数λ随搅拌时间急剧减小，并逐渐趋于平缓，最终达到某一平衡状态.通过对实验数据的拟合，得到其演化模型相关的破坏系数及恢复系数，分别为0.171及0.491.
전미사고체작위일충소성류체，기내부결구적형모특정여장체류동성능긴밀상관，연구전절과정중미관결구적연화특정，대우분석고체관도수송급제비공예중적류동행위구유십분중요적의의.본문차조소묘전경기술，박섭료불동교반시간적고체미관결구도상.종합응용계산궤도상처리기술화분형이론，고산료고체미결구적분형합유수，제출이결구계수λ작위미결구형모특정적표정지표，건립료교반과정중미결구시간연화과정적수학모형.모연자미광고체상관실험적결과표명：기결구계수λ수교반시간급극감소，병축점추우평완，최종체도모일평형상태.통과대실험수거적의합，득도기연화모형상관적파배계수급회복계수，분별위0.171급0.491.
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.