CIESC Journal ›› 2013, Vol. 64 ›› Issue (8): 3039-3044.DOI: 10.3969/j.issn.0438-1157.2013.08.048

Previous Articles     Next Articles

Effect of modes introducing Mg(OH)2 on hydrogen peroxide bleaching of pulps

JIN Huijun, HU Huichao, SONG Yanting, CHAI Xinsheng   

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2013-01-24 Revised:2013-03-18 Online:2013-08-05 Published:2013-08-05

Mg(OH)2引入方式对纸浆过氧化氢漂白工艺的影响

金慧君, 胡会超, 宋燕婷, 柴欣生   

  1. 华南理工大学制浆造纸国家重点实验室, 广东 广州 510640
  • 通讯作者: 柴欣生
  • 作者简介:金慧君(1987- ),女,硕士研究生。

Abstract: In this paper,the effect of modes introducing Mg(OH)2 on hydrogen peroxide(H2O2)bleaching processes was investigated for the eucalyptus kraft pulps.There are three ways to introduce Mg(OH)2 into the bleaching system,i.e.,the direct-addition,or fresh-formed Mg(OH)2 by adding magnesium sulfate into a pulp slurry pre-mixed with sodium hydroxide,or vice verse.The results showed that the particle size distributions of Mg(OH)2 were quite different for the three cases.The average particle sizes are much smaller for fresh-formed Mg(OH)2 than for direct-addition.As a consequence,the processes with fresh-formed Mg(OH)2 were proved more effective for the pulp bleaching,and there were more hydrogen peroxide found in the bleaching effluents and the favorable pulp qualities.The time-dependent pH profiles of the process effluents also indicated that the decomposition of H2O2 for direct-addition or for no addition of Mg(OH)2 was very significant,especially during the early stage of the bleaching processes.

Key words: magnesium sulfate, magnesium hydroxide, hydrogen peroxide bleaching, pulp

关键词: 硫酸镁, 氢氧化镁, 过氧化氢漂白, 纸浆

CLC Number: