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  • 标题:Wetting Technologies for High-Accuracy Sink-Float Separations in Water- Based Media
  • 本地全文:下载
  • 作者:B. Hu ; N. Fraunholz ; P. Rem
  • 期刊名称:Open Waste Management Journal
  • 印刷版ISSN:1876-4002
  • 出版年度:2010
  • 卷号:3
  • 期号:1
  • 页码:71-80
  • DOI:10.2174/1876400201003010071
  • 出版社:Bentham open
  • 摘要:
    The accuracy of sink-float separations in water-based media such as Magnetic Density Separation is compromised by tiny air-bubbles attached to the surface of hydrophobic materials in the feed. Separations of plastics mixtures with accuracy better than 10 kg/m3 require a total elimination of air-bubbles by pre-wetting the surface of the feed particles with a thin film of water. Theoretical and experimental results are compared for pre-wetting processes based on condensation from the gas phase and direct liquid-solid contact for both shredded waste and virgin polymers. The tests show that the wettability of most polymers improve slightly by steaming for about 1 minute, but the best wetting results are obtained with immersion in boiling tap water. The success of wetting in boiling water can be explained by the deposition of a thin layer of calcium carbonate. Shredded plastics are easier to be wetted than virgin polymers, probably because a relatively rougher surface is caused by the shredder process. A new wetting process to eliminate air bubbles was developed on the basis of these results, which carries a minimal amount of heat and water with the feed to the MDS process liquid.


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