超细全尾砂深锥浓密试验研究

Experimental study on deep cone thickening of ultrafine unclassified tailings

随着膏体充填的广泛应用,超细全尾砂在膏体充填中的使用已越来越普遍,针对铅硐山矿的全尾砂,开展了实验室深锥浓密试验。试验尾砂密度为2.879g/cm^3、渗透系数为0.167cm/h,尾砂中-20μm颗粒含量为46.76%且最大粒径不到1000μm,属于脱水性较差的超细全尾砂。通过对3种不同进料浓度的砂浆进行深锥絮凝沉降试验,得知在完成进料后1h的沉降时间基本可达到最大底流浓度,随着进料浓度的增加,底流浓度无显著提升;结果分析得知,铅硐山全尾砂砂浆可实现的底流质量浓度约为67%。试验结果为超细全尾砂充填工艺设计及深锥浓密机选型提供了重要依据。

Ultrafine unclassified tailings has been more and more commonly applied with the extensive application of paste backfilling.In this paper,deep cone thickening test was carried out in laboratory by using unclassified tailings from Qiandongshang mine.Results indicated that the density of the test tailings was 2.879 g/cm^3,the permeability coefficient was 0.167 cm/h,the content of-20μm particles was 46.76%and the maximum particle size was less than 1000μm;thereby,it was a kind of ultrafine unclassified tailings with poor dewatering.Flocculation sedimentation test showed that it could reach the maximum underflow concentration after the completion of feeding for 1 hwith three kinds of slurry feeding concentration.The underflow concentration didn’t increase significantly with the increase of feeding concentration,and the underflow mass concentration of the unclassified tailing slurry was about 67%.The research can provide significant evidence for the process design of backfilling and deep cone selection of ultrafine unclassified tailings.