贵州锦丰金矿胶固粉—分级尾砂充填技术研究与应用

针对贵州锦丰金矿超细尾砂充填体强度低及充填成本高等问题,开展了旋流器底流产率为 65%时的分级尾砂粒级组成分析、不同料浆浓度及不同胶凝剂掺量下的充填体力学特性研究,并根据充填倍线的不同对胶固粉掺量进行配合比优选。 结果表明:胶固粉化学物质含量达到一般固废要求,可以用于井下充填;尾砂矿物组成主要为石英,有利于提高充填体强度;同等强度和流动性要求下,胶固粉掺量仅为水泥掺量的 1 / 2;胶固粉掺量为 5. 5%时,充填体养护 7 d 的试件强度达到 0. 36 MPa,满足设计要求;添加胶固粉的充填体养护龄期超过 28 d 后强度逐渐降低,因此不宜将胶固粉用于打底充填。根据当地水泥和胶固粉单价进行技术经济指标对比,采用胶固粉代替水泥充填可节约大量充填成本,可为类似矿山充填提供有效参考。

Research and Application of Filling Technology with Glue Powder and Graded Tailing in Jinfeng Gold Mine,Guizhou Province

Aiming at the problems of low strength and high filling cost of ultra-fine tailings backfill in Jinfeng Gold Mine,Guizhou Province,the particle composition analysis of graded tailings when the abortion rate of cyclone bottom was 65% andthe physical characteristics of backfill with different slurry concentrations and glue powder dosage were carried out. The mixingratio of glue powder was optimized according to the different filling times. The results showed that the chemical content of gluepowder meets the requirements of general solid waste and can be used for underground filling. The mineral composition of tailings is mainly quartz,which is beneficial to improve the strength of backfill. Under the requirements of the same strength andfluidity,the glue powder dosage is half of the cement dosage. When the dosage of glue powder is 5.5%,the strength of backfillwith curing period of 7 d reaches 0. 36 MPa,which meets the design requirement. The strength of filling body with glue powderdecreases gradually after curing period of more than 28 d,so it is not suitable to use glue powder for render filling. According tothe comparison of technical and economic indicators between local cement and glue powder by unit price,the use of glue powder instead of cement filling can save a lot of filling cost,which can provide effective reference for similar mine filling.