烧结法赤泥全尾砂胶结充填料

为了解决全尾砂、赤泥大量堆积产生的环境问题,实验采用烧结法赤泥、全尾砂等固体废弃物制备矿山充填料.结果表明:胶结剂的优化配比为赤泥49.2%+矿渣32.8%+熟料10%+石膏8%;充填料强度随着全尾砂掺量的增加而急剧下降;试块在水化初期即出现钙矾石、C-S-H凝胶,这些水化产物对早期强度的提高有很大帮助;差式扫描-热重分析表明试块在水化初期即可固结大量水.烧结法赤泥全尾砂胶结充填料具有早期强度高、固结水量大以及大量利用废料等特点,可满足目前矿山充填的需要.

Paste backfilling material prepared with red mud from sintering process and unclassified tailings

To solve the problems of environmental pollution brought by the stockpiling of unclassified tailings and red mud,a mine backfilling material was prepared with red mud from sintering process,unclassified tailings and other solid wastes.The experimental results show that the optimal mass proportions of the cementing agent are red mud 49.2%,slag 32.8%,clinker aggregate 10%,and plaster 8%;the strength of the backfilling material block reduces sharply with the increase of the unclassified tailings addition;the hydration products of ettringite and C-S-H gel generated in the test block at the early stage of hydration help for the early strength.Differential scanning calorimetry-thermo gravimetric(DSC-TG) analysis shows that the test block concretes lots of water at the early stage.The prepared paste backfilling material has the characteristic of high early strength,large water concretion,high quantity wastes utilization,etc.,and it can meet the requirement of mine backfilling.