全尾砂膏体流变学研究现状与展望(下):流变测量与展望

Status and prospects of research on the rheology of paste backfill using unclassified tailings (Part 2): rheological measurement and prospects

  • 摘要: 膏体充填是推动金属矿绿色开采发展的关键技术,并可为资源的深部开采提供安全、绿色、高效的技术支撑。全尾砂膏体流变学是膏体充填技术的基础理论,本文在综述膏体流变概念、特性与模型的基础上,进一步对流变测量技术现状进行了系统梳理,概述了现阶段常用的浆式旋转流变仪、坍落筒、L管、倾斜管及环管法进行流变测量的原理及应用,针对膏体这一屈服型非牛顿流体,重点分析了屈服应力的测量,并对以上方法的适用性进行了综合论述。流变测量深刻地影响着膏体流变理论及膏体充填工艺的发展,为此,对测量技术的关键问题进行了探讨,指出构建膏体流变测量标准及加强流变测量技术与充填工艺的结合是重点,并对膏体流变学研究的发展趋势进行了展望。

     

    Abstract: Cemented paste backfill (CPB) technology is a significant approach for the development of green mining in metal mines and can provide safe, environmentally friendly, and efficient technical support for deep underground mining. As the theoretical basis of paste backfill, the rheological concepts, characteristics, and models of paste had been systematically reviewed, and the rheological measurement methods were analyzed herein. Rheological measurement enables the quantitative characterization of the rheological behavior of paste, and on this basis, a series of studies, such as the rheological constitutive equations of paste, evaluation of the influence of both internal and external factors on paste rheology, and quality control of CPB, was conducted. Generally, the rheology of paste is influenced by certain constituents, including solids concentration, particle size distribution, density, and cement hydration, and various external conditions, such as shear stress and temperature. The rheological properties of paste differ significantly, and currently, a unified method is not yet available for the rheological measurement of paste. Hence, comprehensive knowledge of rheological measurement is essential to achieve a better combination of rheology and CPB engineering, particularly in consideration of the specific physical and chemical properties of tailings and the common practice in the mining field. Therefore, the principles and applications of commonly used approaches, including the vane rheometer, slump cone, L-shaped tube, inclined pipe, and loop facility, were summarized, with emphasis on the measurement of yield stress because of its influence on the paste, that is, a non-Newtonian fluid. Furthermore, the applicability of the aforementioned measurement methods was comprehensively discussed. Given that rheological measurement has a profound effect on the development of paste rheology theory and paste backfill technology, the key problems were discussed by emphasizing the importance of the establishment of rheological measurement standards and the application of rheological measurement to paste backfill processes in real time. The development trend of research on paste rheology was also explored.

     

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