造纸白水中金属离子对浆料Zeta电位的影响

Effect of Metal Ions in Whitewater of Papermaking on the Zeta Potential of the Pulp

中文关键词:  造纸白水  金属离子  留着率  Zeta电位

Key Words:whitewater  metal ion  retention  Zeta potential

中文摘要:

      利用原子吸收光谱法测定文化用纸纸机网下白水中金属离子含量，考察金属离子含量对浆料与填料留着率以及浆料Zeta电位的影响。研究结果表明，白水中积累的3种主要金属离子分别为Fe3+、Mn2+和Ca2+，其含量分别为0.088、0.035和87.2 mg/L；白水中积累的金属离子有助于提高浆料与填料的留着率；白水中低含量的Fe3+和Mn2+对浆料Zeta电位的影响较小，而高含量的Ca2+对浆料Zeta电位的影响很大；随Ca2+含量的增加，浆料Zeta电位急剧升高；在Ca2+一定量的条件下，随阳离子聚丙烯酰胺（CPAM）用量的增加，浆料Zeta电位也会升高，从而增强了CPAM对浆料与填料的絮凝作用。

Abstract:

      The metal ion contents in the whitewater under the wire section of paper machine were determinated by the atomic absorption spectrometry,and the effects of the contents of Fe3+， Mn2+， Ca2+ in whitewater on the retention of the pulp and filler and the Zeta potential of pulp were also investigated. The results showed that the three metal ions accumulating in the whitewater were Fe3+, Mn2+ and Ca2+, and their contents were 0.088, 0.035 and 87.2 mg/L, respectively. Moreover, the metal ions were proved to be of benefit to increase the retention of the pulp and filler. The Zeta potential of the pulp was less affected by Fe3+ and Mn2+, but was affected by high content of Ca2+ significantly. The Zeta potential of the pulp increased rapidly with the increase of the concentration of Ca2+. The Zeta potential of the pulp also increased with the concentration of CPAM increasing when Ca2+ was in centain level. It would enhance the flocculation of the pulp and filler causing by CPAM.