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

doi:10.3969/j.issn.0438-1157.2013.08.048

Abstract

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:

TS74

JIN Huijun, HU Huichao, SONG Yanting, CHAI Xinsheng. Effect of modes introducing Mg(OH)₂ on hydrogen peroxide bleaching of pulps[J]. CIESC Journal, 2013, 64(8): 3039-3044.

金慧君, 胡会超, 宋燕婷, 柴欣生. Mg(OH)₂引入方式对纸浆过氧化氢漂白工艺的影响[J]. 化工学报, 2013, 64(8): 3039-3044.

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

Mg(OH)₂引入方式对纸浆过氧化氢漂白工艺的影响

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