全尾砂沉降特性试验研究

国内某矿山目前主要采用戈壁集料作为充填骨料,随国家新环保政策的发布,戈壁集料价格大幅度上涨,且面临无法采购的风险,将尾砂用于矿山充填是有效的解决途径。尾砂沉降浓缩是尾砂充填的关键环节,通过开展尾砂的自然沉降和絮凝沉降试验研究该矿尾砂的沉降特性。试验结果表明:尾砂自然沉降速率随尾砂浆浓度的增大而减小,底流浓度随尾砂浆浓度的增大呈先增大后趋于稳定;沉降速率随絮凝剂添加量的增大而提高,底流浓度随絮凝剂添加量的增大而降低;尾砂虽然颗粒细小,但因其密度较大,尾砂浆浓度较低时,其静态自然沉降速率可以达到1.5cm/min以上,絮凝剂能够较大地提高低浓度尾砂浆的沉降速率,其对高浓度尾砂浆的沉降速率影响效果不明显。

Experimental Study on Settlement Characteristics of Full Tailings

Gobi aggregates are mainly used as filling aggregates in a domestic mine currently. With the posting of the national new environmental protection policy, the price of Gobi aggregates has increased significantly, and it faces the risk of being unable to purchase. The use of tailings for mine filling is an effective solution. The sedimentation and concentration of tailings is the key technology of tailings filling. The sedimentation characteristics of the full tailings are studied by carried out the natural settlement and flocculation sedimentation test. The test results showed that the natural sedimentation rate of tailings decreased with the increase of tailings concentration. The concentration of underflow increased first and then stabilized with the increase of tailings concentration. The sedimentation rate increased with increasing of the addition amount of flocculant. The concentration of underflow decreased with the increase of flocculant addition. Although the particle size of the tailings are small, the static natural sedimentation rate can reach 1.5 cm/min or more when the concentration of the tailings slurry is low for the tailings with high density. The flocculant can greatly increase the sedimentation rate of tailings slurry with low concentration, but its effect on the sedimentation rate of tailings slurry with low concentration is not obvious.