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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   fall 2018 , Volume 33 , Number 3 (64) ; Page(s) 323 To 336.

Investigation on the effect of anionic trashes management through removing and neutralizing of dissolved and colloidal substances on the properties of chemi-mechanical pulp and paper

Author(s):  Akbari Amri M.*, RESALATI H., SARAEIAN A.R., Dehghani Firuzabadi M.R.
* Faculty of Wood and Paper Engineering, Gorgan, Iran
During the process of paper production, particularly if mechanical or recycled pulps are used, a large amount of soluble and colloidal substances (DCS) are dispersed or dissolved in the process water. Accumulation of DCS in the mill process water, in particular using closed water system, can lead to many deleterious effects on papermaking process and the quality of the paper products. Therefore, removing or controlling of DCS is quite essential to overcome or reduce the negative effects of these materials. The effect of anionic trash neutralization using different anionic trash neutralizers and pulp washing (to remove anionic trash) on the pulp and paper properties was investigated. After the initial preparation of chemi-mechanical pulps (CMP), bleached kraft pulp and mixing of these pulps with each other, precipitated calcium carbonate (PCC) was added. Then, a cationic retention aid (cationic polyacrylamide) was added to the mixture. To neutralize and reduce the negative effects of anionic trashes, different levels of poly DADMAC with molecular weights of 100000-200000 (0. 025-0. 05-0. 1-0. 15%) and Poly aluminum Chloride (PAC) (0. 1-0. 25-0. 5%) was utilized before adding the retention aids. Although zeta potential, drainage time, and total retention of the pulps were improved by applying different neutralizers, burst index of the paper was marginally reduced which was statistically insignificant. Chemi-mechanical pulp washing and drainage treatment caused the reduction of COD and organic anionic trashes. Washing treatment of the pulp improved drainage time, total retention and reduced burst strength index. According to these findings, using cationic polyelectrolyte can be introduced as a good strategy to reduce the harmful effects of anionic trashes and enhance the retention of suspension components.
Keyword(s): Soluble and colloidal substances,anionic trash neutralizers,chemi-mechanical pulp,cationic polyelectrolyte
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