摘要:
以某矿山全尾砂为骨料、水泥和粉煤灰为胶凝材料制作胶结充填材料,采用正交试验探讨了料浆质量浓度、灰砂比和掺灰量对充填材料泌水率、7 d和28 d抗压强度的影响程度,并确定了最佳的全尾砂胶结充填材料配比方案.研究结果表明:料浆质量浓度是影响充填料浆泌水率的主要因素,料浆质量浓度为71%和74%时泌水率小于15%可满足工艺要求;灰砂比对充填材料7 d和28 d抗压强度的影响最大,掺灰量次之,料浆质量浓度最小;确定的最佳配比方案为料浆质量浓度74%、灰砂比1:4、掺灰量10%.
Abstract:
Cemented tailings backfill material was produced by taking unclassified tailings as filling aggregate, and ordinary portland cement and fly ash as cementing agent.The effects of cement-tailing ratio, slurry mass fraction, and proportion of fly ash on slurry's bleeding rate and backfill strength of 7 and 28 days were discussed by orthogonal tests.Consequently, the optimal ratio of unclassified tailings cemented backfill material was determined.The results showed that slurry mass fraction was the major factor affecting its bleeding rate.When slurry mass fraction was 71% or 74%, the bleeding rate was less than 15% and could meet the requirement of mining.The order of the influence degree on 7 and 28 days strength from highest to lowest was cement-tailing ratio, proportion of flay ash and slurry mass fraction.The optimal matching scheme of unclassified tailings cemented backfill material was slurry mass fraction of 74%, cement-tailing ratio of 1:4, and proportion of fly ash of 10%.
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