钛铁矿浮选动力学测试及分析

Flotation dynamics test and analysis for ilmenite

磁选加浮选逐渐成为钛铁矿综合回收的最佳工艺流程,浮选回收面临着矿石比重大、粒度粗、矿浆浓度高(约65%)、作业产率大等特点。针对某厂现有浮选流程,进行了选钛浮选机浮选动力学测试及分析。空气分散度测试表明各台浮选机空气分散度偏小,空气在槽体截面上分散不均,同时吸浆槽浮选机空气分散度明显小于直流槽,空气分散效果不理想;气泡负载率测试表明粗粒级矿物上升运输过程中脱落概率大,回收效果较差;矿浆悬浮能力测试表明浮选机均存在明显的矿浆分层现象,即距溢流堰1100 mm以下矿浆浓度相差不大,随着距溢流堰深度减小,浓度明显下降,近溢流堰区域的矿浆浓度明显小于叶轮区域;浮选机气含率分布不均匀,表明浮选机操作过程中缺乏规律,不能够保证矿物颗粒与气泡间的碰撞、粘附概率。

Magnetic separation plus flotation has gradually become the best process for comprehensive recovery of ilmenite.Flotation recovery is faced with the characteristics of large specific ore,coarse particle size,high slurry concentration(ca.65%),and high mass pull.According to the existing flotation process,the flotation dynamics test and analysis of the titanium flotation equipment were carried out.The air dispersion test shows that the air dispersion of each flotation equipment is low,and the air is unevenly dispersed on the cross section of the tank.At the same time,the air dispersion of the slurry suction flotation cell is obviously lower than that of the direct flow tank,and the effect of air dispersion is not good enough.The bubble loading rate test shows that the coarse-grained minerals have a high probability of falling off during the upward transportation process,and the recovery effect is poor.The slurry suspension test shows that there is obvious slurry stratification phenomenon in all flotation equipment,that is,the slurry concentration is not much different below 1100 mm from the overflow weir.As the depth from the overflow weir decreased,the concentration decreased significantly.The slurry concentration in the area near the overflow weir is obviously lower than that in the area of the impeller.The uneven distribution of gas holdup in the flotation equipment indicates that there is no regularity in the operation of the flotation equipment,and the probability of collision and adhesion between mineral particles and air bubbles cannot be guaranteed.