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Visualization of toner ink adsorption at bubble surfaces

机译:可视化墨粉在气泡表面的吸附

摘要

Flotation deinking involves interactions between inks particles and bubbles surfaces. These interactions are very difficult to observe directly or to quantify in bench-scale experiments or mill operations, making it difficult to evaluate effects of process conditions such as bubble size and solution chemistry on deinking efficiency. This paper presents images and measurements of toner ink interactions with bubble surfaces in laboratory-scale flotation processes. Stable adsorption of toner ink was observed at surfaces of stationary and suspended bubbles for several system chemistries. Interactions of toner particles and bubbles were quantified by high magnification and high temporal resolution digital videos obtained in bubble flow facilities creating both stationary and flowing bubbles. Large (>200 micron), flat toner particles adsorbed to bubble surfaces by single contact points. Smaller toner particles formed very stable complexes in fatty acid chemistries. Desorption of toner ink from bubble surfaces was not observed, even for vigorous flows. Bubbles were observed to be fully covered with toner after 4 minutes of residence time in the suspending bubble flow facility. Initial estimates indicate that bubbles with diameters of approximately 1 mm carry more than 1 mg of ink per bubble.
机译:浮选脱墨涉及油墨颗粒和气泡表面之间的相互作用。这些相互作用很难直接观察到,也很难在实验室规模的实验或工厂操作中进行量化,因此很难评估工艺条件(如气泡大小和溶液化学性质)对脱墨效率的影响。本文介绍了在实验室规模的浮选过程中图像和墨粉墨水与气泡表面相互作用的测量结果。对于几种系统化学,在固定气泡和悬浮气泡的表面均观察到了调色剂墨水的稳定吸附。墨粉颗粒和气泡之间的相互作用通过在气泡流动设备中获得的高倍率和高时间分辨率数字视频进行定量,从而产生固定气泡和流动气泡。大(> 200微米),平坦的碳粉颗粒通过单个接触点吸附到气泡表面。较小的墨粉颗粒在脂肪酸化学中形成非常稳定的配合物。即使剧烈流动,也未观察到墨粉墨水从气泡表面脱附。在悬浮的气泡流动设备中停留4分钟后,观察到气泡完全被墨粉覆盖。初步估计表明,直径约为1毫米的气泡每个气泡承载着超过1毫克的墨水。

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