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膏体触变性是一种复杂的流变现象,涉及到膏体的搅拌制备、管道输送、采场流动等多方面,但是对膏体的触变性机理目前还缺乏统一的认识,对全尾砂膏体处置技术中出现的各种与触变性相关现象还难以解释.针对全尾砂膏体搅拌剪切过程中的触变行为,对某尾矿全尾砂膏体在不同条件下进行流变测试,研究全尾砂粒级、膏体中固相质量分数、水泥添加量、静置时间等因素对膏体触变的影响规律,分析全尾砂膏体触变行为及其对全尾砂膏体稳定性能的影响.研究结果表明,全尾砂颗粒以三维网状结构弥散于浆体空间,其触变性与屈服应力及膏体料浆稳定性相关,受到料浆中超细成分、灰砂比、固相质量分数等影响,膏体触变特征可划分为剪切破坏及静置恢复两个过程,其流变特性具有随时间而变化的特点.
The thixotropy of the paste is a complicated rheological phenomenon, which involves many aspects such as the preparation of the paste, the pipeline transportation, the flow of the stope and so on. However, the thixotropic mechanism of the paste lacks a unified understanding at present. It is difficult to explain the various phenomena associated with thixotropy in the paste disposal technology.Aiming at the thixotropic behavior of the tailstock during agitation shearing, the tailing tailings paste is subjected to rheology under different conditions The effects of various factors such as solid fraction, cement content and standing time on the thixotropy of the paste were studied. The thixotropic behavior of the paste and its effect on the tailing paste The results show that the whole tailing particles dispersed in the three-dimensional network structure in the slurry space, the thixotropy and yield stress and paste slurry stability related to the slurry by the ultra-fine ingredients, sand Than the solid mass fraction, the thixotropic characteristics of the paste can be divided into two processes of shear failure and static recovery, and its rheological properties have the characteristics of changing with time.