废石尾砂混合料浆流变特性及充填采场流动性试验

发布时间：2018-04-06 23:33

本文选题：废石　切入点：尾砂　出处：《厦门大学学报(自然科学版)》2017年02期

【摘要】：为了在金川充填采矿中实现废弃物资源化利用,开展了废石和尾砂两种骨料的混合充填料浆流变特性以及在采场中的流动性研究.首先基于现场取样进行废石和尾砂两种骨料的粒径级配分析,获得了满足充填骨料级配的废石与尾砂的质量比分别是6∶4和5∶5.然后针对这两种混合充填料,进行高浓度充填料浆坍落度试验.结果表明,两种混合充填料浆的坍落度大于20cm,满足金川矿山充填料浆泵送输件的要求;其质量分数在78%以上时属于高流态料浆,但废石与尾砂质量比为6∶4的混合充填料浆的流动性略优于质量比为5∶5的.通过混合充填料浆环管试验,确定了废石与尾砂质量比为6∶4、管径为130mm和质量分数为78%的混合充填料浆为合理管输参数.最后根据充填采场现场调查和强度分析,发现废石与尾砂质量比为6∶4和5∶5的混合充填料浆在采场中流动的坡面角分别为0.55°~1.19°和0.38°~1.26°,但料浆在下料点存在不明显的"锥堆"现象.采场中胶结充填体强度呈现"下高上低"现象,说明废石尾砂混合充填料浆仍存在轻度的沉淀离析.
[Abstract]:In order to realize the reuse of waste in Jinchuan backfill mining, the rheological characteristics and fluidity of mixed filling slurry of waste rock and tailings were studied.Firstly, the particle size gradation of waste rock and tailings is analyzed based on field sampling, and the mass ratio of waste stone to tailings is 6:4 and 5: 5 respectively.Then the slump test of high concentration filling slurry was carried out for these two kinds of mixed filling materials.The results show that the slump of the two kinds of mixed filling slurry is more than 20 cm, which meets the requirement of pumping and transporting parts of the filling slurry in Jinchuan Mine, and its mass fraction above 78% belongs to the high flow state slurry.However, the fluidity of mixed filling slurry with the ratio of waste rock to tailings at 6:4 is slightly better than that of the mixture with a mass ratio of 5:5.Through the experiment of mixed filling slurry loop pipe, the reasonable pipe transportation parameters of mixed filling slurry with mass ratio of 6: 4, pipe diameter of 130mm and mass fraction of 78% were determined.Finally, according to the field investigation and strength analysis of filling stope,It is found that the slope angles of the mixed filling slurry flowing in the stope at 6:4 and 5:5 are 0.55 掳/ 1.19 掳and 0.38 掳/ 1.26 掳respectively, but there is no obvious "cone pile" phenomenon at the feeding point.The strength of cemented filling body in stope presents the phenomenon of "lower height up and lower", which indicates that there is still a slight precipitation segregation of waste tailings mixed filling slurry.
【作者单位】：北京科技大学土木与资源工程学院;金川集团股份有限公司镍钴资源综合利用国家重点实验室;
【基金】：国家高技术研究发展计划(863计划)(SS2012AA062405) 镍钴资源综合利用国家重点实验室项目(金科矿2015-01)
【分类号】：TD853.34

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