高浓度浮选的空气分散和悬浮特性研究

浮选是重要的选矿方法之一，矿浆浓度是影响浮选过程的重要工艺参数。高浓度浮选技术可降低水和药剂的消耗、提高设备处理量和浮选速率，研究高浓度浮选具有重要实际意义。某稀土选厂的矿石密度为3.6 g/cm3，粗选Ⅰ和粗选Ⅱ的给矿浓度分别为57%和51%，属于典型的高浓度浮选。对该选厂粗选Ⅰ和粗选Ⅱ的2台JJF-24浮选机进行了空气分散度和矿浆悬浮性能的测定。结果表明：槽体内表观空气分散度能达到3.8，纵截面空气分散度最低也能达到2.9，浮选机槽内空气分散效果较好；槽体内矿浆呈悬浮状态，不均匀分布，在不同深度截面出现了显著的分层现象；随着截面深度增加，空气分散度与矿浆浓度的变化表现出一定的相关性，可进一步探讨高浓度矿浆的纵向分层与空气分散度之间的联系，以及2者对浮选指标的影响。

Study on Air Distribution and Suspension Characteristics of High Concentration Flotation

Flotation is one of the important beneficiation methods,and the slurry concentration is an important parameter in the flotation process.High concentration flotation technology can reduce the consumption of water and reagents,increase the equipment processing capacity and flotation rate.It's important to study high concentration flotation.The concentration of rougher Ⅰ and rougher Ⅱ in a rare earth site which with the ore specific gravity 3.6 g/cm3,is 57% and 51% respectively,and it can be considered as a typical high concentration flotation.The air distribution and slurry suspension characteristic of the two JJF-24 flotation cells of rougher Ⅰ and rougher Ⅱ were measured.The results show that the surface air dispersion can reach 3.8,while the longitudinal section air dispersion can reach 2.9,which means the air in the flotation cell is well distributed.The slurry in the cells is not suspension uniformly and a significant stratification at different depth sections appears.As the depth of the longitudinal section increases,the relationship between air distribution and slurry concentration shows a certain correlation.Further research can be conducted to find the relationship between stratification and air distribution in high concentration slurry,and to know how the two factors impact on the flotation indicators.