摘要
在充填采矿中利用选矿尾砂、采掘废石是降低充填采矿成本的重要途径,混合料浆集料的粒径级配对充填料浆管道输送的流动性、抗离析及管道阻力具有显著影响。采用土力学中的曲率系数及不均匀系数来评价集料级配不能合理评价混合充填骨料级配优劣。针对金川矿山棒磨砂、全尾砂和戈壁砂混合充填骨料,开展了混合充填料浆的塌落度和流变特性试验,研究混合骨料的细度模数、-75μm细颗粒含量及粗细比对料浆塌落度和流变参数的影响。试验结果表明,在一定质量浓度的范围内,充填料浆塌落度与粗细比呈凸二次曲线关系,与-75μm细颗粒含量呈负线性关系,与细度模数呈正相关关系;料浆的初始剪切应力和粘度系数与细度模数、粗细比呈负相关关系,与-75μm细颗粒含量呈正相关关系。由此可知,采用混合骨料时,细颗粒含量和粗细比两个指标能够合理评价混合骨料的级配优劣。
Using tailings and waste rocks as filling materials is an effective way to reduce the cost of filling mining. The particle size and gradation of the mixed aggregate have a significant impact on slurry flow properties, anti-segregation ability and pipe- line transportation resistance. It is not appropriate to use the curvature coefficient and the uniformity coefficient, which are de- fined in soil mechanics, to evaluate the mixed aggregate gradation. The slump and rheological properties test were carried out on mixed filling slurry which was composed of rod-mill railings, full tailings and gobi sand in Jinchuan mine. Therefore, the impacts of fineness modulus, fine particle content of -75μm and the coarse-to-fine ratio on slurry slump and rheological param- eters were studied. The result showed that, in a certain range of mass concentration, the slump had a convex conic relationship with the coarse-to-fine ratio, a negative linear relationship with the fine particle content of -75μm, and a positive correction with the fineness modulus. While the initial shear stress and viscosity coefficient both had a negative correlation with the fine- ness modulus and coarse-to-fine ratio, and a positive correlation with fine particle content of -75 μm. As a result, using the fine particle content and coarse-to-fine ratio was suitable to evaluate the gradation of mixed aggregate.
出处
《矿业研究与开发》
CAS
北大核心
2018年第3期53-59,共7页
Mining Research and Development
基金
国家高技术研究发展计划(863)项目(SS2012AA062405)
镍钴资源综合利用国家重点实验室资助项目(金科矿2015-01).
关键词
混合充填骨料
粒径级配
粗细比
塌落度
流变特性
Mixed filling aggregate, Particle size and gradation, Coarse-to-fine ratio, slump, Rheologieal properties
