旋流气浮中气泡-颗粒碰撞效率影响因素理论分析

在旋流气浮接触区碰撞模型基础上，通过理论计算考察了物性、运行和结构参数对分散相颗粒/油滴与气泡碰撞效率的影响. 结果表明，物性参数中的分散相粒径与密度、运行参数中气泡直径与切向速度和结构参数中等效旋流直径对碰撞效率影响较大. 在旋流气浮工艺中，碰撞效率随分散相粒径增大而增大，但随气泡直径和分散相颗粒/油滴密度增大而减小；分散相粒径小于0.02 mm时，碰撞效率随切向速度增大而减小、随等效旋流直径增大而增大；分散相颗粒/油滴大于0.02 mm时，碰撞效率随切向速度增大而增大、随等效旋流直径增大而减小. 旋流气浮去除的主要是油滴大于0.02 mm的非溶解性油，因此，设备紧凑可提高气泡与分散相颗粒的碰撞效率，达到高效分离目的.

Theoretical Analysis on the Influential Factors of Bubble-Particle Collision Efficiency in Hydrocyclone Flotation

On the basis of the bubble-particle collision efficiency model in the contact zone of cyclone flotation, the effects of physical property parameters, operating parameters and structural parameters on the collision efficiency were investigated. The results show that physical property parameters such as disperse phase size and density, operating parameters such as bubble size and tangential velocity and structural parameters such as equivalent hydrocyclone diameter have great effect on the collision efficiency. In the hydrocyclone flotation process, the collision efficiency increases with the increase of disperse phase size, and decreases with the increase of bubble size and disperse phase (oil droplet) density. When the disperse phase size is less than 0.02 mm, which is mainly dissolved oil, the collision efficiency increases with the decrease of tangential velocity, and increases with the increase of equivalent hydrocyclone diameter. However, when the disperse phase size is over 0.02 mm, the effects of tangential velocity and equivalent hydrocyclone diameter on the collision efficiency are exactly opposite of a bond. What removed by cyclone flotation is mainly non-soluble oil (oil drop diameter >0.02 mm). The densification of hydroclone flotation can improve the bubble-particle collision efficiency, achieving high efficiency separation.