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Open AccessArticle

Influence of Particle Contact Number on Triboelectric Separation Selectivity

Chair of Process Systems Engineering, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Gregor-Mendel-Straße 4, 85354 Freising, Germany
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Processes 2019, 7(10), 716; https://doi.org/10.3390/pr7100716
Received: 22 August 2019 / Revised: 18 September 2019 / Accepted: 29 September 2019 / Published: 9 October 2019
(This article belongs to the Section Chemical Systems)
Triboelectric separation is a promising technology to separate fine powders. To enable triboelectric separation for its application in industry, the impact of the process and product parameters must be examined. In this study, with regards to different wall materials in the charging step (PTFE, POM, PE, PVC, and PMMA), the influence of the powder composition of a binary starch-protein mixture with a protein content of 15 wt.%, 30 wt.% and 45 wt.% was studied. By increasing the protein content in the feed, the separation selectivity increased. No dependency of the empirical triboelectric series was determined for all powder compositions. The variation in the protein content of the initial powder and turbulent flow profiles results in a variation in the contact number of particles calculated. An increase in the contact number of particles leads to an increase in the protein content separated on the cathode, whereas the protein content on the anode is only slightly affected. These findings underpin the assumption that particle-particle interaction plays a decisive role in triboelectric charging of fine powders. View Full-Text
Keywords: triboelectric charging; triboelectric separation; particle-particle interaction; powder composition; contact number triboelectric charging; triboelectric separation; particle-particle interaction; powder composition; contact number
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MDPI and ACS Style

Landauer, J.; Foerst, P. Influence of Particle Contact Number on Triboelectric Separation Selectivity. Processes 2019, 7, 716.

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