铅锌尾砂胶结充填材料优化配比正交试验

Orthogonal experiments for lead-zinc tailings cemented paste backfill material optimal matching scheme

为优化铅锌尾砂胶结充填工艺参数,提高充填体的强度指标,采用正交试验方法分析料浆质量分数、灰砂比、粉煤灰掺量对充填体坍落度、泌水率和单轴抗压强度的影响,并确定充填材料的最优配合比。试验结果显示：料浆质量分数是影响充填体坍落度和泌水率的主要因素,料浆质量分数为74%时,坍落度为18.2~21.0 cm,料浆质量分数为74%时泌水率最低（≈1%）;充填体7天和28天单轴抗压强度与料浆质量分数及灰砂比呈正相关关系,与粉煤灰掺量呈负相关关系。综合考虑坍落度、泌水率和单轴抗压强度后得出试验结果,铅锌尾砂胶结充填最优配合比为料浆质量分数74%、灰砂比1：6、粉煤灰掺量15%。

For the sake of optimizing the process parameters of lead-zinc cemented paste backfill material,and enhancing the strength of filling body,effects of slurry mass fraction,cement-tailing ratio,and fly ash dosage on slump,bleeding rate,and uniaxial compressive strength were studied with orthogonal experiments. And the optimum matching scheme was determined for the cemented paste backfill material. The results show that slurry mass fraction is the major factor affecting lead-zinc cemented paste backfill slump and bleeding rate,and effects of cement-tailing ratio and fly ash dosage are less than those of slurry mass fraction,when slurry mass fraction is 74%,slump is 18. 2- 21. 0 cm,and bleeding rate is minimum（ approximately 1%）,and that uniaxial compressive strength of 7 and 28 days correlates positively with slurry mass fraction and cement-tailing ratio,but negatively with fly ash dosage. Fully considering of slump,bleeding rate and uniaxial compressive strength test results leads the authors to the optimal matching scheme of lead-zinc tailing cemented paste backfill material： slurry mass fraction is 74%,cement-tailing ratio is 1： 6,fly ash dosage is 15%.