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废旧塑料浮选回收中气泡-颗粒粘附行为研究

发表时间:2014-12-31  浏览量:1794  下载量:452
全部作者: 姚婧婧,李彦鹏
作者单位: 陕西先科环境科技有限责任公司;长安大学环境科学与工程学院
摘 要: 以聚丙烯(polypropylene, PP)、聚乙烯(polyethylene, PE)、聚四氟乙烯(polytetrafluoroethylene, PTFE)3种塑料小球为对象,以研究气泡在球面的粘附行为为目标,在特制的塑料浮选实验装置上,选择十二烷基苯磺酸钠(sodium dodecyl benzene sulfonate, SDBS)和茶皂素(tea saponin)2种不同类型表面活性剂,采用高速摄像技术与图像处理软件进行分析,详细考察表面活性剂浓度、塑料材质等因素对单个气泡在塑料球面粘附行为的影响。研究结果表明:不同塑料材质对气泡粘附行为有一定的影响。气泡撞击不同球面的可视化过程基本一致,速度的变化趋势也相同。不同的是,材料不同撞击反弹速度不同,动能耗散也有所不同,最终发生三相接触的时间也不同;表面活性剂的浓度对气泡粘附行为有明显影响。随SDBS溶液浓度的增加,气泡碰撞速度和反弹速度逐渐减小,最大反弹距离也相应缩短,碰撞和反弹次数也随之减少,气泡动能耗散逐渐增加,当浓度增加到一定值时,气泡不再与PP塑料球面发生三相吸附。
关 键 词: 环境工程学;表面活性剂;塑料浮选;气泡;三相接触
Title: Research on the adhesion behavior of bubble-particle in waste plastic flotation recycling
Author: YAO Jingjing, LI Yanpeng
Organization: Shaanxi Xianke Environmental Technology Co. Ltd.; School of Environmental Science and Engineering, Chang’an University
Abstract: In order to study adhesion behavior of bubbles in the sphere, three kinds of plastic balls made of polypropylene(PP), polyethylene(PE) and polytetrafluoroethylene(PTFE) were studied in this paper. Two types of surfactants, sodium dodecyl benzene sulfonate(SDBS) and tea saponin, were chosen as flotation agent to study adhesion behavior of a single bubble in the plastic ball affected by the concentration of surfactant as well as plastic material and other factors on a specially-designed flotation column using high-speed camera and image processing software. The results showed that the bubble adhesion behavior was certainly influenced by the material types. The visual process of single bubble impacting different sphere was consistent and the trends of the speed change were practically the same. Bubble rebound velocity and kinetic energy dissipation were different as material varied, thus three-phase contact time was different. The concentration of surfactants had a significant impact on bubble adhesion behavior. The velocity of bubble collision and rebound decreased gradually as the increasing concentration of SDBS solution and maximum bounce distance was reduced as well. As less number of collision and rebound, bubble kinetic energy dissipation increased gradually. When the concentration reached a certain value, there was no longer three-phase contact occurring between the bubble and PP sphere.
Key words: environmental engineering; surfactant; plastic flotation; bubble; three-phase contact
发表期数: 2014年12月第24期
引用格式: 姚婧婧,李彦鹏. 废旧塑料浮选回收中气泡-颗粒粘附行为研究[J]. 中国科技论文在线精品论文,2014,7(24):2414-2420.
 
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