金川矿山混合充填材料配比试验

充填料浆配比对充填体强度和砂浆输送特性产生重要影响。针对金川矿山棒磨砂供应严重不足,开展了棒磨砂、棒磨砂+河砂和棒磨砂+河砂+粉煤灰3种充填材料添加相同水泥的充填体强度、砂浆流动度、泌水率和沉降损失率的试验研究。试验结果显示,河砂与棒磨砂配比为2∶8的混合充填料与单一棒磨砂充填体强度相当,砂浆流动度、泌水率和沉缩损失率稍差,但满足金川矿山充填采矿要求。当添加水泥重量的30%粉煤灰后,不仅显著提高充填体强度,而且还可改善砂浆流动度、泌水率和沉降损失率;同时还降低棒磨砂浆充填料浆的分层度,有利于提高充填体质量和充填接顶率。研究成果已经应用于金川矿山充填料浆制备和工业化生产。

Test on Proportions of Mixed Filling Materials in Jinchuan Mine

The proportion of filling material slurry has a significant impact on filling body strength and slurry conveying properties.Due to the shortages in the supply of rod milled sands in Jinchuan Mine,tests were carried out to investigate the filling intensity,slurry fluidity,bleeding ratio and loss rate of sedimentation of mixed filling slurry which contains three kinds of filling additives of rod milled sand,rod milled sand+river sand and rod milled sand+river sand+fly ash by adding the same amount of cement.The results showed that with proportion of river sand+rod milled sand at 2∶8,mixed filling slurry has the same filling intensity with the rod milled sand,and its slurry fluidity,bleeding ratio and loss rate of sedimentation are relatively lower.Still,it can meet the requirements of backfill mining in Jinchuan Mine.With the additive of fly ash as much as 30% of cement,the mixed slurry can greatly improve the strength of filling body,but also improve slurry fluidity,bleeding ratio and loss rate of sedimentation.Meanwhile,the segregation degree of filling slurry is reduced,which provides benefits to improve filling body quality and roof-contacted filling.The research result has been successfully applied in filling slurry preparation and industrial production in Jinchuan Mine.