【作者】 邱兴；

【导师】 何北海；

【作者基本信息】 华南理工大学 ， 制浆造纸工程， 2010， 硕士

【摘要】 本文主要是通过研究白水代替清水溶解湿部化学品,探讨白水溶解湿部化学品对化学品使用效率的影响,并进而探讨白水代替清水溶解湿部化学品的可行性,给造纸厂具体实行这一节水措施提供参考和依据。通过实验室配制模拟白水,并利用模拟白水溶解助留助滤剂,分析金属离子对CPAM+膨润土二元助留体系的留着效果的影响发现,金属离子对CPAM+膨润土二元助留体系对浆料的助留效果有一定的促进作用。其原因是金属离子及其水解产物吸附到纤维表面上会导致浆料Zeta电位负值的降低。使得细小粒子与纤维间的静电排斥减小,彼此易于接近而产生“凝结”,有利于CPAM对浆料的絮凝作用,从而促进浆料总留着和填料的留着。通过使用工厂多盘白水清滤液代替清水溶解助留助滤剂的研究发现,在使用高速乳化机对膨润土悬浮液进行分散的条件下,直接使用多盘白水清滤液代替清水溶解CPAM、分散膨润土,对CPAM+膨润土的二元助留系统的留着效果基本没有影响。这在一定意义上证明了用白水代替清水来溶解和分散助留助滤剂对于工厂来说是可行的。通过引入荧光增白剂作为模型物,研究白水溶解助留助滤剂和固着剂对荧光增白剂的适应性发现,荧光增白剂的存在会大大降低CPAM+膨润土二元助留体系的留着效果,其中填料留着率(FPAR)在循环至稳定时下降了约60%,而在荧光增白剂存在的条件下,使用多盘白水清滤液溶解CPAM、分散膨润土与用清水时的留着效果基本一致,两者留着率的下降幅度基本相同。通过在CPAM+膨润土二元助留系统的基础上引入了有机微粒子,对CPAM+膨润土+有机微粒子三元助留系统对荧光增白剂的适应性研究发现,有机微粒子能够很好的提升CPAM+膨润土二元助留系统的助留效果。负电荷有机微粒子相对于正电荷有机微粒子对荧光增白剂的适应性更好,其填料留着率在循环至稳定后仅下降约15%,而正电荷有机微粒子则下降了约40%,而使用白水溶解有机微粒子对于有机微粒子的助留效果基本没有影响。更多还原

【Abstract】 In this thesis, the efficiency of wet-end chemicals is determined when using white water to dissolove wet-end chemicals, and the feasibility of using whitewater instead of fresh water to dissolve wet-end chemicals was disscussed, the results provide reference for paper mills in reducing the fresh water consumption.By preparing the simulated white water, and dissolving retention and drainage aids with it, the influence of metal ions on the function of CPAM+bentonite retention aid system was analysised. it was found that metal ions promoted the efficiency of the CPAM+bentonite system. The reason is that the adsorption of metal ion and its hydrolysate on the surface of pulp fibers decreases the negative value of Zeta potential of pulp fibers, therefore reduces the electrostatic repulsion between the fine particles and fibers, making them approach to each other easier and occurring“coagulation”. This is favorable to the flocculation of CPAM with pulp fibers, and promoting the retention of pulp and fillers.White water from disc saveall in paper mills was used instead of clean water for dissolving the retention and drainage aid, it was found that there was almost no influence on the performance of CPAM+bentonite retention system if the bentonite suspension was dispersed with high-speed emulsifier. This proved that it is feasible for paper mills to dissolve and disperse retention and drainage aids using white water instead of fresh water.The adaptability of retention and drainage aids dissolved with white water to the fluorescent brightener was studied, it was found that the presence of fluorescent brightener greatly reduced the efficiency of CPAM+bentonite retention system. The filler retention(FPAR) was reduced by about 60%. While in the presence of fluorescent brightener, the efficency of retention system prepared with white water was almost the same as fresh water. and the decrease amplitude in retention rate was same as well.Organic particles was introduced into the dual retention system, and the adaptability of CPAM+bentonite+organic particles ternary retention system to fluorescent brightener was discussed. it was found that organic particles effectively enhanced the performance of CPAM + bentonite dual retention system. Negative charged organic particles presented better adaptability to fluorescent brightener comparing with positive charged organic particles. in which the filler retention dropped only about 15% when the circulations reach constant, while for the positive charged organic particles it decreased by about 40%, and there was no influence on the retention efficiency dissolving organic particles with white water.更多还原