某金矿全尾砂膏体充填优化配比及性能研究

Optimization of ungraded tailings paste backfill mix ratio and performance study in a gold mine

为解决某金矿尾矿库库容不足及环境污染问题,计划采用全尾砂膏体充填采矿法进行地下开采。为提供经济合理的最优配比方案,以该矿山膏体物料为试验材料,设计对比试验来研究不同配比、不同料浆浓度、不同减水剂掺量对膏体强度和流动性的影响。试验结果表明:水泥、粉煤灰和尾砂的质量比,料浆浓度和减水剂掺量是影响膏体强度与流动性的重要因素;少量的减水剂能明显提高膏体的强度,适当地控制料浆浓度与减水剂掺量可以达到更好的充填效果;粉煤灰的添加有助于减水剂增强膏体的强度;最终综合考虑料浆流动性与试样的强度,推荐充填最优配比为水泥、粉煤灰和尾砂质量比1∶0.5∶8,料浆浓度为66%,可适当添加1%左右的减水剂。该研究也可为矿山未来的全尾砂膏体充填工程提供理论依据。

To address the insufficient capacity of a tailings storage facility and environmental concerns at a gold mine,an ungraded tailings paste backfill method is planned for underground mining.To provide an economically feasible optimal mix design,experiments were conducted using the paste materials from the mine.Comparative tests were designed to study the effects of different mix ratios,slurry concentrations,and water-reducing agent addition on the strength and flowability of the paste.The results indicate that the mass ratios of cement,fly ash,and tailings,as well as slurry concentration and water-reducing agent addition,are crucial factors influencing the paste s strength and flowability.A small amount of water-reducing agent significantly enhances the strength of the backfill paste.Proper control of slurry concentration and water-reducing agent addition can achieve better filling results.The addition of fly ash aids in improving paste strength with a water-reducing agent.After considering both slurry flowability and sample strength,the recommended optimal mix ratio for backfill is 1∶0.5∶8(cement,fly ash,and tailings by mass)with a concentration of 66%,and the addition of approximately 1%water-reducing agent if necessary.This study also provides a theoretical basis for future ungraded tailings paste backfill projects in mines.