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Title: On Quantification of Residual Ink Content and Deinking Efficiency in Recycling of Mixed Office Waste Paper

Source: Industrial Engineering Chemistry Research, 2011, 50, 6965-6971; 2011

Author(s)Li, Bo; Wang, Gaosheng; Chen, Kefu; Vahey, David W.; Zhu, J.Y.

Publication Year: 2011  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-4A

Abstract: Although (flotation) deinking has been a common industry practice for several decades, true residual ink content and deinking efficiency have never been quantified. Paper brightness and ERIC (Effective Residual Ink Concentration), based on measurements of the absorption coefficient of deinked pulp, have been used to determine performance of flotation deinking processes and the quality of deinked pulps. This study demonstrated a new method for quantifying true residual ink content of mixed office waste paper by determining the trace iron content in pulp samples. Two sets of laboratory studies were conducted, one using mixed pulp samples of different ink contents and the other using samples from flotation deinking experiments with different surfactant dosages. All pulp samples including flotation feeds and accepts were characterized by ERIC, brightness, and iron-contentderived ink content. The results suggest that ERIC and brightness are less suitable than iron content for evaluating the residual ink in very clean papers. In flotation studies, both ERIC and brightness predict lower deinking efficiencies than are obtained from ironcontent measurements. However, brightness is suitable for evaluating the final quality of very clean deinked pulp because of its high accuracy at high brightness levels.

Keywords: Waste paper, recycling, pulping, fibers, flotation, absorption, iron, surface active agents, measurement, deinking, waste paper, wood fibers, brightness

Publication Review Process: Formally Refereed

File size: 881 kb(s)

Date posted: 06/10/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 39104
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer

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