Fan Xianfeng, Waters Kristian E, Rowson Neil A, Parker David J
School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
J Colloid Interface Sci. 2009 Jan 1;329(1):167-72. doi: 10.1016/j.jcis.2008.09.064. Epub 2008 Sep 30.
In this study, microwave irradiation is used to modify ilmenite surface chemistry to enhance the adsorption of surfactants and the air bubble attachment. The results indicate that microwave irradiation can increase ilmenite flotation recovery by 20%. A positron emission particle tracking technique is used to study the dynamic behaviour of ilmenite particles in a Denver cell. The data shows that the poor flotation recovery of ilmenite is not only due to the reduce probability of ilmenite being captured by air bubbles, but also the short residence time of the particles remaining in the froth phase. The ilmenite particles can be frequently captured by air bubbles, but dropped to the bulk liquid from the froth phase, normally over 15 s. Microwave irradiation changes the ilmenite flow pattern in the Denver cell. The average time of ilmenite remaining in froth phase is increased from 11.5 to 29.1 s.
在本研究中，采用微波辐射来改变钛铁矿的表面化学性质，以增强表面活性剂的吸附及气泡附着。结果表明，微波辐射可使钛铁矿的浮选回收率提高20%。采用正电子发射粒子跟踪技术研究丹佛槽中钛铁矿颗粒的动态行为。数据显示，钛铁矿浮选回收率低不仅是由于其被气泡捕获的概率降低，还因为颗粒在泡沫相中停留的时间较短。钛铁矿颗粒可频繁被气泡捕获，但通常在15秒以上就会从泡沫相掉落到主体液体中。微波辐射改变了丹佛槽中钛铁矿的流动模式。钛铁矿在泡沫相中停留的平均时间从11.5秒增加到了29.1秒。
