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Evaluation and Optimization of Old Magzines deinking Process of a Modified Lignin Sulfonates deinking Agent

Paper And Biomaterials 2019年第1期4卷 31-39页

作者： ShuBin Wu SiJia Chen YuanYuan Zhao State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of Technology

deinking is an important process in waste paper recycling process,and this study mainly focuses on the properties of the deinking agent and process ***-30 prepared in our laboratory,and FS and LD,were the three representative deinking agents studied ***,effective residual ink concentration(ERIC),dirt,macro-stickies,fiber loss during repulping,flotation,and washing processes were measured to evaluate the performance of the deinking agents and optimize process *** of the deinking agents exhibited different advantages:DIA-30 was optimal for deinking efficiency,brightness enhancement,as well as dirt and macrostickies removal,whereas LD was optimal for ink removal during flotation process but performed poorly in terms of brightness *** showed a relatively balanced performance compared to those of DIA-30 and LD in the deinking process,but DIA-30 is the best option for deinking due to its outstanding comprehensive *** optimal repulping conditions for the deinking of 100%old magzines(OMG)using DIA-30 are as follows:repulping temperature,60℃;pulp consistency,13 wt%;repulping time,20 min;H2O2 dosage,0.5 wt%(oven-dried pulp);NaOH dosage,1.2 wt%(oven-dried pulp);Na2SiO3 dosage,0.3 wt%(oven-dried pulp);and optimum DIA-30 dosage,0.1 wt%.

关键词： deinking agent optimization secondary fiber waste paper old magzines

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Comparisons between Flotation deinking Abilities of Newsprint Paper by Using Enzyme and Chemicals

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Journal of Chemistry and Chemical Engineering 2012年第9期6卷 832-837页

作者： Nucharin Luangsa-Ard Oranutch Khampan Somporn Chaiareekij Department of Printing and Packaging Technology Faculty of lndustrial Ducation and Technology King Mongkut's University ofTechnology Thonburi Bangkok 10140 Thailand Department of lmaging and Printing Technology Faculty of Science Chulalongkorn University Bangkok 10330 Thailand

The aim of this research is to study the floatation deinking abilities of black mold enzyme and chemicals in newsprint paper application. In this experiment, the properties of deinked pulp from three different additives--chemicals, black mold enzyme, and chemicals together with black mold enzyme, are studied. The first part of the experiment was to find the optimal amount of chemicals and the optimal pH through the use of sodium hydroxide and surfactant. As a result, 0.2% of sodium hydroxide and 0.4% of surfactant on oven dried weight at pH 9 was found to be the optimal condition for the deinked pulp to yield the lowest ERIC （effective residual concentration） and the highest brightness. The second part of the experiment was to find the optimal amount of black mold enzyme used in the deinking process. As a result, the optimal condition for deinked pulp to retain the lowest ERIC and the highest brightness was 100 ppm of black mold enzyme and 10 minutes of enzyme reaction time. The third part of experiment was to study the de-inking ability of black mold enzyme and chemicals. Consequently, with 30 min of chemicals reaction time and 60 min of black mold reaction time, the deinked pulp retained low ERIC but higher brightness.

关键词： Newsprint deinking enzyme offset ink.

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