The role of particle size on the deposition efficiency of ink on plastic spheres

Mohammed O.J. Azzam, Hasan Mousa*, Abduljalil A. Al-Maqraei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Experimental investigation of the effect of carbon particle size on its deposition efficiency on the surface of plastic particles has been performed in stirred vessel. A model based on Langmuir kinetics was used, and it provided a good fit for the experimental results. The effect of de-inking conditions such as, carbon particle size, calcium chloride concentration, and carbon concentration has been investigated. Different sizes of carbon particles were tested. It was found that the deposition rate and the deposition efficiency were generally higher for the larger carbon particles. The effect of CaCl 2 concentration on the deposition efficiency was investigated. Results showed that the deposition rate increased when the concentration of CaCl2 increased from 0.05 to 0.10g/l (the stochiometric ratio needed to react with sodium stearate). Moreover, the deposition efficiency was higher at this concentration. Concentrations above the stochiometric ratio did not show a systematic behavior for the deposition rate and the deposition efficiency. Finally, the effect of carbon concentration was examined. Carbon concentration of 0.25, 0.30, and 0.40g/l were used. Results showed that the concentration of carbon did not affect the deposition efficiency nor the rate of deposition. This study confirmed the applicability of the method of ink removal from recycled waste paper using plastic particles, proposed by previous investigators.

Original languageEnglish
Pages (from-to)207-216
Number of pages10
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1-3
Publication statusPublished - Dec 10 2003


  • De-inking
  • Deposition
  • Efficiency
  • Ink
  • Recycled paper

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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