全尾砂料浆流变特性试验
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摘要
利用尾砂进行胶结充填,不仅可以有效避免尾砂堆存引起的环境、土地等问题,还可以有效保障矿区人员的人身和财产安全。充填尾砂的强度和流变特性对采空区的稳定性及料浆输送过程的难易程度有重要影响。在对某铁矿全尾砂物理化学性质研究的基础上,通过控制剪切速率的方法(CR法)研究不同灰砂比、不同质量浓度充填料浆的流变特性。结果表明:料浆流变曲线适合用宾汉塑性体的流变特征来描述;料浆的屈服应力随着料浆浓度的增加而增大,在灰砂比一定时,屈服应力与料浆浓度之间呈指数关系;在同一质量浓度条件下,充填料浆的屈服应力值变化不大;灰砂比为1∶6,1∶8和1∶10的充填料浆,当其浓度由72%增加到74%时,料浆的屈服应力呈现大幅度的增长;料浆的粘度系数随着质量浓度的不断增加而增大,粘度系数随着灰砂比的增大基本呈现增大的趋势,但是灰砂比对其影响不显著。
Cemented filling with tailings can not only effectively avoid the environmental and land problems caused by tailings stockpiling,but also effectively guarantee the personal and property safety of mining personnel.The strength and rheological properties of filling tailings have an important influence on the stability of goaf and the difficulty of slurry transportation.Based on the study of physical and chemical properties of tailings from an iron mine,the rheological properties of filling slurries with different cement-sand ratios and different mass concentrations were studied by controlling shear rate(CR method).The results were concluded as follows.Firstly,the rheological curve of slurry was suitable to be described by the rheological properties of Bingham plastic body.Secondly,the yield stress of slurry increased with the increase of slurry concentration,and there was an exponential relationship between the yield stress and slurry concentration at a certain cement-sand ratio.Thirdly,under the same mass concentration,the yield stress of filling slurry had little change.Fourthly,when the cement-sand ratio of filling slurry was 1∶6,1∶8 and 1∶10 and its concentration increased from 72%to 74%,the yield stress of slurry increased greatly.Finally,the viscosity coefficient of slurry increased with the increase of mass concentration,and basically showed an increasing trend with the increase of lime-sand ratio,but the influence of cement-sand ratio was not significant.
Cemented filling with tailings can not only effectively avoid the environmental and land problems caused by tailings stockpiling,but also effectively guarantee the personal and property safety of mining personnel.The strength and rheological properties of filling tailings have an important influence on the stability of goaf and the difficulty of slurry transportation.Based on the study of physical and chemical properties of tailings from an iron mine,the rheological properties of filling slurries with different cement-sand ratios and different mass concentrations were studied by controlling shear rate(CR method).The results were concluded as follows.Firstly,the rheological curve of slurry was suitable to be described by the rheological properties of Bingham plastic body.Secondly,the yield stress of slurry increased with the increase of slurry concentration,and there was an exponential relationship between the yield stress and slurry concentration at a certain cement-sand ratio.Thirdly,under the same mass concentration,the yield stress of filling slurry had little change.Fourthly,when the cement-sand ratio of filling slurry was 1∶6,1∶8 and 1∶10 and its concentration increased from 72%to 74%,the yield stress of slurry increased greatly.Finally,the viscosity coefficient of slurry increased with the increase of mass concentration,and basically showed an increasing trend with the increase of lime-sand ratio,but the influence of cement-sand ratio was not significant.
引文
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[2]颜丙恒,李翠平,王少勇,等.某全尾砂膏体流变参数测量及其流变模型优化[J].金属矿山,2017(12):44-48.
[3]朱家锐,毛明发,王炳文,等.全尾砂充填料浆流变性能试验研究[J].矿冶,2018(1):5-8.
[4]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.
[5]甘德清,赵海鑫,刘志义,等.全尾砂料浆管道输送阻力损失影响因素敏感性分析[J].矿业研究与开发,2018,38(3):136-139.
[6]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(6):882-886.
[7]马浩吉,王贻明,王元青,等.西藏甲玛铜矿全尾砂膏体充填料浆流变特性研究[J].金属矿山,2017(11):42-47.
[8]李茂辉,高谦,南世卿.新型胶结材料全尾砂浆流变特性试验分析[J].矿业研究与开发,2013,33(2):15-17.
[9]谢德瑜,张华,胡滨,等.张庄铁矿充填尾砂流变特性实验研究[J].矿冶工程,2015(5):14-16.
[10]付自国,乔登攀,郭忠林,等.超细尾砂胶结充填体强度计算模型及应用[J].岩土力学,2018:1-10.
[11]刘晓辉.膏体尾矿流变行为的宏细观分析及其测定方法[J].金属矿山,2018(5):7-11.
[12]郭亚兵,陈洪江,李亚红.尾矿膏体流变学塌落度与屈服应力试验研究[J].矿山机械,2016(4):81-85.
[13]Deng Xuejie,Klein Bern,Tong Libing,et al.Experimental study on the rheological behavior of ultrafine cemented backfill[J].Construction and Building Materials,2018(185):985-994.
[14]Deng D Q,Liu L,Yao Z L,et al.A practice of ultra-fine tailings disposal as filling material in a gold mine[J].Journal of Environmental Management,2017(196):100-109.
[15]薛振林,张友志,鲍亚豪,等.考虑温度影响的全尾砂料浆流变性能研究[J].金属矿山,2016(10):35-39.
[16]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.
[17]兰文涛,吴爱祥,王贻明,等.半水磷石膏充填强度影响因素试验[J].哈尔滨工业大学学报,2018:1-9.
[18]杨超,郭利杰,张林,等.铜尾矿流变特性与管道输送阻力计算[J].工程科学学报,2017(5):663-668.
[19]Boylu F,Dincer H,Atesok G.Effect of coal particle size distribution,volume fraction and rank on the rheology of coal water slurries[J].Fuel processing technology,2004,85(4):241-250.
[20]杨志强,王永前,高谦,等.金川镍矿尾砂膏体充填系统工艺技术改造与应用研究[J].有色金属科学与工程,2014,5(2):1-9.