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

作　　者：ShuBin Wu SiJia Chen YuanYuan Zhao 

机构地区：[1]State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Engineering,South China University of Technology

出　　处：《Paper And Biomaterials》2019年第1期31-39,共9页造纸与生物质材料（英文）

基　　金：support from the science and technology project of Guangzhou city (Contract No. 201607020025)

摘　　要：Deinking is an important process in waste paper recycling process,and this study mainly focuses on the properties of the deinking agent and process optimization.DIA-30 prepared in our laboratory,and FS and LD,were the three representative deinking agents studied herein.Brightness,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 conditions.Each 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 enhancement.FS 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 properties.The 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%.Deinking is an important process in waste paper recycling process, and this study mainly focuses on the properties of the deinking agent and process optimization. DIA-30 prepared in our laboratory, and FS and LD, were the three representative deinking agents studied herein. Brightness, 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 conditions. Each 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 enhancement. FS 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 properties. The 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 

分 类 号：TS[轻工技术与工程]