无机盐对铝矿泥沉降速率的影响——以广西平果铝尾矿泥为例

Effect of Inorganic Salts on the Sedimentation Rate of an Aluminum Slime-Case History of the Pingguo Aluminum Tailings Slurry

广西平果铝尾矿泥浆具有具有粒径小、带电、比表面积大、含水率高、沉降困难、含有Al3+杂质等特点。由于平果铝矿泥颗粒间带电,矿泥颗粒间的范德华力作用对其沉降具有较大的影响,而无机盐在水中的电离会对矿泥的电层厚度产生一定的影响,进而影响矿泥的沉降速度。选取常见的无机盐NaCl加入矿泥浆并充分搅拌,根据矿泥上清液高度-沉降时间关系分析加入NaCl对矿泥浆沉降速率的影响。结果表明:矿泥的沉降存在三个阶段:湍流影响阶段、主要沉降阶段、次要沉降阶段,且随着加入NaCl浓度的上升,矿泥浆沉降速率逐渐降低。

Guangxi Pingguo aluminum tailings slurry has the characteristics of small particle size,electric charged,large specific surface area,high water content,difficult to settle,and containing Al3+impurities.As Pingguo aluminum slime particles charged,the Van der Waals force in the mine slurry particles has a great influence on its sedimentation,and the ionization of the inorganic salt will have an impact on the thickness of the electric layer,and then affect the slurry of the sedimentation rate.In this paper,a common inorganic salt,NaCl,was selected to be added into the slurry and fully stirred.The influence of adding the NaCl on the sedimentation rate of the slurry was analyzed according to the relationship between the height and the settling time of the supernatant of the slurry.The results show that there are three stages of the slime sedimentation:the turbulence influence stage,the main settling stage and the secondary settling stage.With the increase of the NaCl concentration,the rate of the slurry gradually decreased.