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燒結法赤泥全尾砂膠結充填料

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

  • 摘要: 為了解決全尾砂、赤泥大量堆積產生的環境問題,實驗采用燒結法赤泥、全尾砂等固體廢棄物制備礦山充填料.結果表明:膠結劑的優化配比為赤泥49.2%+礦渣32.8%+熟料10%+石膏8%;充填料強度隨著全尾砂摻量的增加而急劇下降;試塊在水化初期即出現鈣礬石、C-S-H凝膠,這些水化產物對早期強度的提高有很大幫助;差式掃描-熱重分析表明試塊在水化初期即可固結大量水.燒結法赤泥全尾砂膠結充填料具有早期強度高、固結水量大以及大量利用廢料等特點,可滿足目前礦山充填的需要.

     

    Abstract: 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 cttringite 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 gravimetrie (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.

     

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