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全尾砂膏體流變學研究現狀與展望(下):流變測量與展望

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

  • 摘要: 膏體充填是推動金屬礦綠色開采發展的關鍵技術,并可為資源的深部開采提供安全、綠色、高效的技術支撐。全尾砂膏體流變學是膏體充填技術的基礎理論,本文在綜述膏體流變概念、特性與模型的基礎上,進一步對流變測量技術現狀進行了系統梳理,概述了現階段常用的漿式旋轉流變儀、坍落筒、L管、傾斜管及環管法進行流變測量的原理及應用,針對膏體這一屈服型非牛頓流體,重點分析了屈服應力的測量,并對以上方法的適用性進行了綜合論述。流變測量深刻地影響著膏體流變理論及膏體充填工藝的發展,為此,對測量技術的關鍵問題進行了探討,指出構建膏體流變測量標準及加強流變測量技術與充填工藝的結合是重點,并對膏體流變學研究的發展趨勢進行了展望。

     

    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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