泵送减水剂对尾砂-棒磨砂膏体料浆和易性与充填体强度影响研究
Research on pumping water reducing agent affecting on the strength of backfilling body and workability of paste slurry with tailing and rod grinding sand

针对金川镍矿尾砂-棒磨砂膏体在充填管道输送中存在的堵管问题，开展了泵送减水剂对膏体的和易性与充填体强度影响试验研究. 首先分析了膏体物料的物化特性和颗粒级配；然后采用金川镍矿尾砂-棒磨砂膏体充填系统工业生产中的技术参数，开展了添加不同泵送减水剂添加量的充填体强度、膏体和易性以及流变特性参数测试研究. 研究结果显示，当添加1%~2%的泵送减水剂，3、7和28d强度均有显著提高. 膏体的和易性随泵送减水剂添加量的增加而提高，且浓度越高，效果越显著. 当膏体浓度（质量浓度）在78%~80%的范围，膏体初始剪切应力和粘滞系数均随着泵送减水剂的增加而线性减小. 结合泵送减水剂对充填体强度、膏体和易性以及流变特性影响分析，并考虑膏体充填成本与采矿经济效益，确定1%的泵送减水剂为比较合理的添加量. 研究结果为金川镍矿膏体充填系统料浆制备提供重要依据，已经应用于金川矿山膏体充填的工业化生产.
Considering the problems of plugging piping in the tailings paste filling system in Jinchuan nickel mine，the study on the workability and strength of filling body by adding the slurry pumping water reducing agent had been done. Firstly the physico-chemical properties and particle size distribution of the materials were analyzed. Then the experiments of the filling body strength，workability and rheological properties of the filling slurry by adding pumping water-reducing agent with different amount were carried out based on the industrial production technical parameters of the tailings paste backfill system of in Jinchuan Nickel Mine. The results shows，when addition quantity of pumping water-reducing agent is 1%~ 2%，not only the filling body strength of the 3，7，28d can be increased，but also the workability of filling slurry is to be improved，which the higher the concentration of slurry the more remarkable of the workabilityof filling slurry being improved. When the concentration of slurry is in the scope of 78%~80%，the initial shear yield force and viscous coefficient of paste are decreasing with the increasing of additive amount of pumping water-reducing agent. Overall considering research results of the strength of backfill body，workability and rheological behavior of paste slurry by adding different amount of pumping water-reducing agent，the reasonable amount adding of 1% is given. The research results provide the theoretical foundation to design matching of paste filling slurry and have been applied to the industrial production in Jinchuan Mine