云南某矿尾砂膏体充填物料缓凝特性研究

Research on Retarding Properties of Filling Materials of Sand Paste in one Yunnan Tailings

为解决云南某矿在充填采矿过程中尾砂膏体充填物料出现的缓凝现象,本文采用工艺矿物学的方法对其尾砂进行激光粒度分析、化学多元素分析、X射线衍射分析、MLA分析和扫描电镜分析,研究尾砂的物理化学性质对膏体充填物料凝固性能的影响。结果表明:尾砂样品的细粒级含量虽高(-20μm粒级的颗粒含量在25%以上),但尾砂粒度对膏体充填物料的凝固性能影响较小;尾砂样品中含量约为5.8%的石膏成分延长了水泥水化凝固时间,导致尾砂膏体充填物料的缓凝。因此,在选矿过程中需尽可能地减少含有石膏成分的相应采矿点所采原矿的配矿量,以此解决缓凝问题。

In order to solve the retarding phenomenon in the sand paste filling materials during the filling mining process in one Yunnan mine, the process mineralogy methods is adopted to do the laser particle size analysis, chemical multielement analysis, X-ray diffraction analysis, MLA analysis and scanning electron microscope analysis of the mill tailings, thereby, the effect of tailings＇physical and chemical properties on the solidification performance of paste filling material is researched. The results show： the fine size fraction content in the tailings sample is high （-20 μm size fraction content above than 25%）, but the effect of tailings particle size on solidification performance of paste filling material is small;there are about 5.8% gypsum content in the tailings sample, which prolongs the hydration solidification time of the cement, and generate the long-setting of the paste filling materials of sand tailings. Therefore, the ore blending amount that from the corresponding mines with the gypsum composition shall be increased as far as possible to solve the long-setting problem.