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Evaluation of dynamic attachment phenomena of micro stickles to air bubbles

机译:评价微粘性气泡的动态附着现象

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Stickies that present in the recycled fiber cause runnability and quality problems. While macro stickies, because of their size, are generally easy to remove by screens and cleaners, micro stickies are hardly removed by these conventional processes. It has been pointed out that flotation and washing can be appropriate process for micro stickies removal. Static contact angle measurements showed that flotation of sticky contaminants depends upon the surface chemical aspects of contaminants and liquids. In the actual flotation process, however, air bubbles are not in static condition. Thus it is required that the effect of surface chemical characteristics on stickies removal be evaluated in dynamic condition. In this study the dynamic attachment phenomena of micro stickies to air bubbles was examined using a novel dynamic bubble imager. A free air bubble with known size was kept at a place against the flow of water containing micro stickies, and the images of the air bubble were captured to evaluate the attachment phenomena of micro stickies on the air bubble as a function of flotation time. It was shown that this new dynamic bubble imager is very useful and effective to evaluate the dynamic attachment phenomena of micro stickies. The effect of calcium carbonate, talc, surfactants and various polymers on the attachment of micro stickies onto air bubbles was investigated and discussed. Addition of talc increased the micro stickies attachment to the air bubble, while polymers decreased it. Polymers, however, increased micro stickies attachment to air bubbles when fibers are present.
机译:再生纤维中存在的胶粘物会导致运行性和质量问题。尽管大尺寸胶粘物由于其尺寸而通常易于通过筛网和清洁器除去,但微胶粘物却很难通过这些常规方法除去。已经指出,浮选和洗涤可以是去除微胶粘物的合适方法。静态接触角测量表明,粘性污染物的浮选取决于污染物和液体的表面化学性质。但是,在实际的浮选过程中,气泡不是处于静止状态。因此,需要在动态条件下评估表面化学特性对胶粘物去除的影响。在这项研究中,使用新型的动态气泡成像仪检查了微粘性对气泡的动态附着现象。将已知大小的自由气泡放置在一个位置,以防含有微粘性水的流动,​​并捕获气泡的图像以评估微粘性在气泡上的附着现象,这是浮选时间的函数。结果表明,这种新型的动态气泡成像仪对于评估微胶粘物的动态附着现象非常有用和有效。研究和讨论了碳酸钙,滑石粉,表面活性剂和各种聚合物对微胶粘剂附着在气泡上的影响。滑石粉的添加增加了对气泡的微粘性附着,而聚合物降低了它。但是,当存在纤维时,聚合物会增加附着在气泡上的微粘性。

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