Abstract It is known that fine and ultrafine particles are difficult to float mainly due to their low collision efficiency with bubbles. In this paper, the effect of microbubble addition, on the recovery of fine quartz particles floated with conventional bubbles is discussed. Microbubbles stabilised by collectors were produced using an external air–in–water micro-dispersion generator and added to the pulp in a flotation cell before the introduction of conventional bubbles. It was found that when microbubbles were used, much less collector (about half) was needed to achieve the same or even slightly higher recovery. At the same time, the quartz flotation rate was also higher when microbubbles were used. The advantage of microbubbles may be attributed to a higher attachment efficiency of the conventional bubbles with the fine particles covered with microbubbles. The interaction between microbubble–collector–quartz and the involved mechanism will be identified.

中文翻译：

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在结合微泡和常规气泡存在的情况下浮选细颗粒

摘要 众所周知，细颗粒和超细颗粒难以漂浮的主要原因是它们与气泡的碰撞效率低。在本文中，讨论了添加微气泡对漂浮有常规气泡的石英细颗粒的回收的影响。由捕收剂稳定的微气泡是使用外部空气包水微分散发生器产生的，并在引入常规气泡之前添加到浮选槽中的纸浆中。发现当使用微泡时，需要更少的收集器（大约一半）来实现相同或什至略高的回收率。同时，当使用微气泡时，石英浮选率也更高。微气泡的优点可能是由于传统气泡具有更高的附着效率，微气泡覆盖了细小颗粒。将确定微泡-收集器-石英之间的相互作用和相关机制。