关键词: 旋流气浮, 气泡, 颗粒, 碰撞效率, 切向速度, 等效旋流直径

Abstract: 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.

Key words: hydrocyclone flotation, bubble, particle, collision efficiency, tangential velocity, equivalent hydrocyclone diameter