To fully utilize secondary resources,it will inevitably generate a large amount of deinking sludge using waste paper as raw material for paper making.The sludge contains small fibers and dissolved substances of variou...To fully utilize secondary resources,it will inevitably generate a large amount of deinking sludge using waste paper as raw material for paper making.The sludge contains small fibers and dissolved substances of various chemicals.After adding flocculant and settling treatment,deinked sludge is formed.However,its organic matter content can reach a high level of 40%to 50%,and it can also be reused,effectively avoiding the harmful impact of papermaking sludge on the environment.展开更多
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...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%.展开更多
文摘To fully utilize secondary resources,it will inevitably generate a large amount of deinking sludge using waste paper as raw material for paper making.The sludge contains small fibers and dissolved substances of various chemicals.After adding flocculant and settling treatment,deinked sludge is formed.However,its organic matter content can reach a high level of 40%to 50%,and it can also be reused,effectively avoiding the harmful impact of papermaking sludge on the environment.
基金support from the science and technology project of Guangzhou city (Contract No. 201607020025)
文摘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%.
