Tailingsgradation is the key factor that influences the backfill quality.The segregation of backfill slurry in An-ging Coppermine due to an inappropriate tailinggradation seriously affected the filling quality.In view of this,an ideal tailinggradation has been confirmed through the fillingmaterials ratio tests,namely the underflow coarse sands and the overflow fine sands aremixed at the ratio of 17 : 3 after the cyclone classification of the ore.Based on the existing backfill system,the under-flow coarse sands and the overflow fine sands of themine have been thickened respectively by using the current vertical tailings tank,and a paste fillingmaterial with a bettergranular composition was prepared aftermixing and blending the classified tail-ings with the concentration of 72% and the overflow fine sands with the concentration of 58%.Practices showed that:the quali-fied paste fillingmaterials that couldmatch both the strength of filling body and the transmissibility of filling slurry with agood homogeneity was produced.Furthermore,this scheme also satisfies the needs of the paste cemented backfill and the sand-water non-cemented filling,and agood economic benefit is obtained.%尾砂级配是影响充填质量的关键因素,安庆铜矿因尾砂级配不合理导致充填料浆离析,严重影响充填质量.对此,通过开展充填料配比试验确定了理想的尾砂级配,即将矿山旋流分级后的底流粗砂与溢流细砂按17:3的比例混合.根据矿山充填系统工艺,利用现有立式砂仓对底流粗砂与溢流细砂分别进行了浓缩,浓缩后的72%浓度的分级尾砂与58%浓度的溢流细砂混合搅拌后制备出具有较优级配的膏体充填料.实践证明:该方案可制备出兼顾充填体强度与充填料浆输送性的合格膏体充填料,充填体均匀性好,同时,该方案可满足膏体胶结充填与水砂非胶结充填需求,实现了较好的经济效益.
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