基于降粘效应的碎石全尾砂最佳配合比研究.DOC

基于降粘效应的碎石全尾砂最佳配合比研究 张钦礼1， 邵佳1,2，陈秋松1 （1.中南大学 资源与安全工程学院, 湖南 长沙 410083；2.吉首大学 商学院, 湖南 吉首 416000） 摘要：碎石-尾砂充填系统中骨料的配合比直接影响浆体输送系统的稳定性。为确定碎石全尾砂的最佳理论配合比，本文通过探究碎石全尾砂混合前后极限浓度的变化，获得混合料极限浓度与碎石全尾砂比例关系的函数曲线，曲线表明：存在某个最佳碎石全尾砂比例，使混合料的极限浓度达到峰值；在相当大的范围内，混合料极限浓度高于二者各自的属性值，即碎石全尾砂混合后存在降粘效应。最后通过数学分析，得到碎石全尾砂最佳配合比计算模型。取某矿山碎石全尾砂充填骨料进行分析，计算得到混合料中理想的碎石比例为70%。通过室内配比实验验证，同等输送浓度、灰砂比条件下，当混合料中碎石比例为65%左右时，混合料浆流动性能最佳（塌落度最大），与公式计算结果（70%）偏差控制在10%以内。本文具有一定的可靠性，可以为相类似工程计算提供依据。关键词： Optimal proportion of gravel and tailing base on viscosity reducing effect Zhang Qinli1, Shao Jia1,2, Chen Qiusong1 (1. Central South University, School of Resources and Safety Engineering, Changsha 410083, China 2. School of business, Jishou University, Jishou 416000, China) Abstract The aggregate proportion in gravel- tailing filling system is a key factor to affect the stability of slurry transportation system. In order to determine the optimal proportion of gravels and full tailings in theory, the relations function curve of limit concentration and gravels’ proportion was drawn, through exploring the changes of limit concentration before and after mixture of gravels and full tailings. The curve shown that there exist a optimal proportion which can get the maximal limit concentration. Moreover, limit concentration of mixture is higher than the respective attribute value in most of time. In other words, viscosity reducing effect exists after mixing the gravels and full tailings. Finally, the calculation model of optimal proportion between gravels and full tailings was established through mathematical analysis. This calculation model was applied to calculate the proportion of gravels and full tailings in some mine, and it was got that the optimal gravel proportion is 70%. Through the indoor mixture proportion experiment, it was got that when the gravel proportion in mixture is about 65%, the mixture slurry flow performance is the best (biggest slump), compared to result of formula (70%), the error can be controlled in 10%. K