细尾砂浆自然浓缩规律试验研究

Experimental study on the laws of natural concentration of fine tailings

用于矿山充填骨料的细尾砂,在制备过程中沉降速率慢、底流浓度低,严重影响尾砂制备工艺。本文设计了低浓度、中高浓度和高浓度等不同初始浓度的细尾砂浆,开展了12组自然沉降试验。通过分析细尾砂浆自然沉降底流浓度的结果,得出尾砂浆初始浓度在范围8%~55%内与其自然沉降底流浓度之间呈线性关系,其相关系数为0.16,最小底流浓度为66.4%;中低浓度尾砂浆自然沉降过程中,"清水区"浊度较高,沉降面不明显,且出现"三分层现象",表明在沉降过程中有存在明显粗细分层现象,其粗颗粒沉降速率较高,而细颗粒部分沉降速率极低;高浓度尾砂的沉降速率随着砂浆浓度增加而有降低的趋势。

The fine tailing used for filling aggregates in mines had a slow settling rate and a low concentration of underflow,which seriously affected the tailings preparation process.In the paper,the low,medium and high concentration of fine tailings with different initial concentrations were designed and 12 sets of natural settlement tests were carried out.By analyzing the test results of the underflow concentration of the fine tailings,the linear relationship was found between the initial concentration in the range of 8%~55%and the underflow concentration.The correlation coefficient was 0.16 and the initial concentration was 66.4%.In the process of natural sedimentation of middle and low concentration tailings slurry,the“clear water area”had higher turbidity,the settlement surface not obvious,and“three-layers phenomenon”appeared,which indicated that there was a clear coarse subdivision phenomenon and the rate of fine tailings was extremely low.According to the law of settlement curve of high concentration tailings,it could be seen that the sedimentation rate decreased with the increase of tailings concentration.