金川全尾砂–棒磨砂混合充填料胶砂强度与料浆流变特性研究

RESEARCH ON FILLING BODY STRENGTH AND RHEOLOGICAL PROPERTIES OF MIXED FILLING MORTAR WITH UNCLASSIFIED TAILINGS AND ROD MILLING SAND IN JINCHUAN MINE

针对金川矿山棒磨砂充填料严重不足,开展全尾砂–棒磨砂混合充填料的胶砂试验研究。通过不同配比和料浆浓度的全尾砂–棒磨砂混合充填料的胶砂强度试验和料浆流变特性参数测试,获得充填体试块强度与混合料的配合比、平均粒径以及不均匀性系数之间的关系,针对金川下向进路胶结充填法采矿,确定了满足充填体强度要求的全尾砂–棒磨砂的合理配比为3∶7。研究表明,混合充填料的7和28 d充填体强度和砂浆泌水率与沉降损失率,均优于纯棒磨砂充填料。该研究结果为金川矿山全尾砂工业化应用提供技术支撑,为金川全尾砂废弃物的资源化利用和环境保护奠定了基础。

The research on mixed filling materials including unclassified tailings and rod milling sand was conducted due to the serious lack of rod mill sand in Jinchuan mine. Based on the experiments of filling body strength and rheological properties for different ratios of mixed filling mortar with unclassified tailings-rod milling sand,revealed the relationship between filling body strength and the ratios,average particle size and uniformity coefficient and determined the reasonable ratio of Unclassified Tailings and Rod Milling sand was 3∶7 which apply to underhand drift cut-and-fill method in Jinchuan mine. The research shows that the compressive strength of 7 d and 28 d bleeding and sedimentation rate were precede rod milling sands. This research achievement provided important technical support to industrialized application of unclassified tailings in Jinchuan mine and laid the foundation of the utilization of waste resources and environmental protection.