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고지 재활용을 위한 부유부상 공정에서의 게면 특성이 탈묵 효율에 미치는 영향에 관한 연구

Effects of Interfacial Properties on Deinking Efficiency in Flotation Process for Old Paper Recycle

손종석 임종주^†

Jong-Suk Son Jong-Choo Lim^†

동국대학교 공과대학 화학공학과, 서울

Dept. of Chemical Engineering, Dongguk University, Seoul, Korea

jongchoo@dgu.ac.kr

HWAHAK KONGHAK, June 2000, 38(3), 360-365(6), NONE

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Abstract

부유부상법에 의한 신문 고지 탈묵 과정에서 계면활성제, pH, 첨가한 전해질의 농도 및 종류가 탈묵 효율에 미치는 영향을 살펴보았다. 음이온 계면활성제 시스템에서는 산성이나 알칼리 조건에서 첨가한 상대 이온이 잉크 입자와 기포 표면의 음이온 전하를 중화시킴으로써 전기적 반발력을 감소시켜 잉크 제저 효율이 증가하였으며, 음이온 계면활성제와 비이온 계면활성제를 혼합하여 사용한 경우에는 pH 감소에 따라 잉크 제거 효율이 감소하였다. 음이온 계면활성제와 혼합 게면활성제 시스템에서 첨가한 전해질 종류와 농도에 따른 탈묵 효율을 각각 살펴본 결과 두 시스템 모두 잉크 입자 표면에의 전하 존재 유무와 전하의 크기에 의해서 크게 영향을 받음을 알 수 있었다. 한편 펄프의 인장강도와 잉크 입자의 접촉각 및 표면장력은 pH 변화와 전해질의 농도 및 종류에 따라 크게 영향을 받지 않았다.

Flotation deinking experiments were conducted in order to understand the effects of surfactant, pH, and electrolyte concentration on old news paper deinking efficiency. Both removal efficiency and brightness were found to increase in anionic surfactant systems both at acid and alkali conditions, because added counter ions reduced electrostatic repulsion between negatively charged air bubbles and ink particles. IN mixed surfactant systems, both removal efficiency and brightness were shown to increase with a decrease in pH, mainly due to reduction in electrostatic repulsion by an increase of hydrogen ion concentration. When electrolytes were added un anionic surfactant systems or mixed surfactant systems, ink removal efficiency increased or decreased, depending on the change in electrostatic repulsion between ink particles and air bubbles. On the other hand, both pH change and addition of electrolytes did not have a significant effect on physical strength of the pulp fiber, and contact angle and surface tension of the ink particle.

Keywords

Flotation Deinking Surfactant pH Electrolyte Zeta Potential

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