国外膏体充填基础理论研究综述

    Review on the basic theory of paste backfill in oversea

    • 摘要: 膏体充填是将尾砂、胶结剂和水进行优化组合,配制成的牙膏状胶结体,通过管道以柱塞流的形态输送到充填采场。膏体充填与以往浆体充填相比有很多技术优势,如早期强度大有利于缩短充填时间,充填所需水泥用量少降低采矿成本等等,受到了世界各地现代矿山企业的青睐。本文基于对膏体充填技术发展史的回顾,总结了过去30年内世界各地对膏体充填技术研究的新进展,得出以下结论:膏体的充填材料成分及粒度分布对膏体的流动性能及力学性能有显著影响,膏体的配料中-20μm颗粒的含量必须大于15%;膏体属于结构流体,具有较高的屈服应力和黏度,管道输送速度小于1m/s,明确膏体的流动特性和如何降低屈服应力是其输送系统的关键;采场中充填后内部应力变化复杂,产生拱效应,由于拱效应的影响使充填强度大幅升高,在充填设计中需考虑拱效应以降低充填成本。

       

      Abstract: Paste backfill is made of tailing,cement and water with optimum combination,to make mixture like the toothpaste cementing body,and conveying the plunger flow through the pipeline to the filling stope.In comparison with the previous slurry mine fills,there are number of advantages,such as,the early strength of paste backfill can contribute to shortening of the cycle time of backfilling operation,the advantages of minimal requirement or no bulkhead together with less cement content which contributes to reduction of the mining cost.Paste fill is favored by most of the modern mining companies around the world.This paper based on the review of the historical development of paste backfill and it focuses on highlighting of the development of technologies developed around the world in the last three decades.The conclusions are as follows:Frist,The material composition and particle size distribution of paste have a significant effect on the flow and mechanical properties of the paste,the content of-20μm in the paste mixture must be greater than 15%.Second,The paste is a structural fluid with high yield stress and viscosity,and the pipeline conveying speed is less than 1m/s,clear the flow characteristics of paste and how to reduce the yield stress is the key to the conveying system of paste.Third,The internal stress of the stope is complicated and the arch effect is produced,the strength of filling is greatly increased due to the arch effect,arch effect should be considered in the design of filling to reduce the filling cost.

       

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