高浓度全尾砂充填料浆流变特性试验研究
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摘要
为探究某矿全尾砂充填料浆的流变特性,利用MCR52流变仪对不同浓度和灰砂比的全尾砂充填料浆进行流变参数测试,同时进行了扩展度测定。结果表明:对充填料浆流变特性的影响程度由大到小依次为质量浓度、灰砂比;料浆质量浓度相同时,屈服应力和平均黏度均随胶凝材料掺量的减小而减小,扩展度增大;料浆灰砂比相同时,屈服应力和平均黏度随料浆质量浓度增大而增大,扩展度减小;充填料浆浓度由76%增大至78%时,屈服应力、平均黏度陡增2～3倍,扩展度急剧减小,浓度低的充填料浆流动性能较好;全尾砂充填料浆具有"剪切变稀"的明显特征,扩展度可直观表征料浆的流动性能。
With the full tailings of an ore as research object,the rheological parameters of the filling slurry with different concentrations and cement-sand ratios were measured by MCR52 rheometer,and the extensibility of slurry was also measured. Mass concentration of slurry has a largest impact on the rheological properties of slurry,followed by cement-sand ratio. At given mass concentration,the yield stress and average viscosity of slurry both declined whereas extensibility increased with the reduction of cementitious material content. At given cement-sand ratio,the yield stress and average viscosity enhanced whereas extensibility weakened with the increase of mass concentration.With the filling slurry concentration increasing from 76% to 78%,the yield stress and the average viscosity surged by two to three times and the extensibility abated sharply,which suggest that filling slurry of low concentration is of better fluidity. The filling slurry of full tailings has obvious characteristics of"shear thinning". The fluidity of slurry can be directly characterized by extensibility.
With the full tailings of an ore as research object,the rheological parameters of the filling slurry with different concentrations and cement-sand ratios were measured by MCR52 rheometer,and the extensibility of slurry was also measured. Mass concentration of slurry has a largest impact on the rheological properties of slurry,followed by cement-sand ratio. At given mass concentration,the yield stress and average viscosity of slurry both declined whereas extensibility increased with the reduction of cementitious material content. At given cement-sand ratio,the yield stress and average viscosity enhanced whereas extensibility weakened with the increase of mass concentration.With the filling slurry concentration increasing from 76% to 78%,the yield stress and the average viscosity surged by two to three times and the extensibility abated sharply,which suggest that filling slurry of low concentration is of better fluidity. The filling slurry of full tailings has obvious characteristics of"shear thinning". The fluidity of slurry can be directly characterized by extensibility.
引文
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[12]王小萍,殷素红,赵三银,等.碱激发碳酸盐矿-矿渣复合灌浆材料流变性能的研究[J].长江科学院院报,2006,23(6):80-83.
[2]侯国权,郭利杰,杨超,等.高浓度全尾砂充填料浆流变特性试验研究[J].中国矿业,2014,23(增2):238-241.
[3]罗涛,张亮,姜亮亮,等.高浓度全尾砂料浆流变特性参数试验及管道输送研究[J].有色金属科学与工程,2015,6(4):86-90.
[4]吴爱祥,焦华喆,王洪江,等.膏体尾矿屈服应力检测及其优化[J].中南大学学报(自然科学版),2013,44(8):3370-3376.
[5]蔡嗣经,黄刚,吴迪,等.尾砂充填料浆流变性能模型与试验研究[J].东北大学学报(自然科学版),2015,36(6):882-886.
[6]张贵金,刘杰,胡大可,等.黏土水泥膏浆流变性能及其对灌浆的影响[J].长江科学院院报,2017,34(3):119-125.
[7]翟永刚,吴爱祥,王洪江,等.全尾砂膏体料浆的流变特性研究[J].金属矿山,2010,(12):30-32.
[8]张光存.金川镍矿早强胶凝材料开发及充填料浆管输特性研究[D].北京:北京科技大学,2015.
[9]郭利杰,薛杉杉,许文浒,等.甲玛铜多金属矿尾砂充填料浆流变性能影响因素分析[J].有色金属工程,2016,6(2):56-63.
[10]杨志强,高谦,王永前,等.金川全尾砂-棒磨砂混合充填料胶砂强度与料浆流变特性研究[J].岩石力学与工程学报,2014,33(增2):3985-3991.
[11]刘斯忠,王洪江,吴爱祥,等.掺入泵送剂全尾砂膏体流变特性研究[J].武汉理工大学学报(交通科学与工程版),2014,38(4):919-922.
[12]王小萍,殷素红,赵三银,等.碱激发碳酸盐矿-矿渣复合灌浆材料流变性能的研究[J].长江科学院院报,2006,23(6):80-83.