运动状态下全尾砂胶结料浆流变参数时变性研究
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摘要
全尾砂胶结料浆在管路输送过程中流变参数具有时变性。以连续搅拌方式模拟料浆在输送过程中的运动状态,借助Brookfield流变仪研究了不同质量浓度和灰砂比条件下,搅拌时间对料浆流变参数的影响规律及作用机理。研究结果表明:1)当搅拌时间逐渐增加时,灰砂比1∶5,质量浓度分别为72%、74%和76%的全尾砂胶结料浆其屈服应力和黏性系数均随之增大,且料浆质量浓度越高,搅拌时间对料浆流变参数的影响越显著;2)质量浓度74%,灰砂比分别为1∶5、1∶10和1∶15的全尾砂胶结料浆屈服应力和黏性系数也随搅拌时间的增加而增大。料浆流变参数增大的主要原因为:料浆中水泥水化反应产生的具有凝聚网络结构的凝胶成分含量随时间的增加而不断增加。
Rheological parameters of unclassified tailings cemented slurry are time-dependent during pipeline transportation.The motion state of the slurry during pipeline transportation was simulated by continuous stirring a method of continuous stirring was used.Using Brookfield rheometer,effects of stirring time on rheological parameters of slurry and its mechanism were analyzed under different mass concentrations and cement-sand ratio.The results indicated that∶1)with the cement-sand ratio of 1∶5,the yield stress and viscosity coefficient were increased with the increase of stirring time as the concentration of slurry was 72%,74% and 76%,and the higher the concentration was,the more significant of the stirring time on the rheological parameters of the slurry;2)with the mass concentration of 74%,the yield stress and viscosity coefficient were also growth with the increase of stirring time as the cement-sand ratio was 1∶5,1∶10 and 1∶15.The increase of rheological parameters of slurry was mainly attributed to that the content of gel component which had coherency network structures generated by cement hydration reaction in slurry increased continuously with the hydration time.
Rheological parameters of unclassified tailings cemented slurry are time-dependent during pipeline transportation.The motion state of the slurry during pipeline transportation was simulated by continuous stirring a method of continuous stirring was used.Using Brookfield rheometer,effects of stirring time on rheological parameters of slurry and its mechanism were analyzed under different mass concentrations and cement-sand ratio.The results indicated that∶1)with the cement-sand ratio of 1∶5,the yield stress and viscosity coefficient were increased with the increase of stirring time as the concentration of slurry was 72%,74% and 76%,and the higher the concentration was,the more significant of the stirring time on the rheological parameters of the slurry;2)with the mass concentration of 74%,the yield stress and viscosity coefficient were also growth with the increase of stirring time as the cement-sand ratio was 1∶5,1∶10 and 1∶15.The increase of rheological parameters of slurry was mainly attributed to that the content of gel component which had coherency network structures generated by cement hydration reaction in slurry increased continuously with the hydration time.
引文
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[3]张亮,罗涛,朱志成,等.高浓度料浆流变特性及其管道输送阻力损失研究[J].中国矿业,2014,23(增刊2):301-304.
[4]刘超,王洪江,吴爱祥,等.铜钼矿细粒全尾膏体浓度范围确定[J].岩石力学与工程学报,2015,34(增刊1):3432-3438.
[5]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):30-57.
[6]刘桂华,黄亚军,张明,等.表面活性剂对铝土矿选矿尾砂流变性的影响[J].矿冶工程,2009,29(2):25-28.
[7]张钦礼,王石,王新民,等.不同质量浓度下阴离子型聚丙烯酰胺对似膏体流变参数的影响[J].中国有色金属学报,2016,26(8):1794-1801.
[8]吴爱祥,焦华喆,王洪江,等.膏体尾砂屈服应力检测及优化[J].中南大学学报(自然科学版),2013,44(8):3370-3376.
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