Novel Kaolin-based Deinking Reagent for Improved Deinking of Waste Paper

摘要

A novel deinking reagent based on modified kaolin has been developed for the flotation deinking of waste paper. This deinking reagent, called DEKA 2000, is composed of the modified kaolin and a surfactant specifically formulated to maximize the effect of mis modified kaolin in flotation deinking. As is well known in the literature, the very fine particle size of ink, dirt, and stickies particles is one of the main causes for their poor floatability in flotation deinking. However, due to the hydrophobicity and relatively larger particle size of the modified kaolin, this deinking reagent acts as a collector for these fine particles. Thus, this deinking reagent gives more efficient separation and removal of the ink, dirt, and stickies particles from the waste papers being recycled. Deinking mills using this novel deinking reagent showed an increase in brightness and lower dirt count values of the deinked pulp. In addition, lower stickies content were observed in the deinked pulp, resulting in better runnability of the paper machine. In some cases, the use of this deinking reagent has allowed the deinking mill to use poorer grade of feed furnish. Overall, the results obtained by deinking mills show that the use of DEKA 2000 can improve brightness, lower dirt count values, improve stickies removal, and reduce total cost.