Partition of soluble and precipitated oxalate and its implication on decreasing oxalate-related scaling during peroxide bleaching of mechanical pulps

被引：0

作者：

Yu, L. ^{[1
]}

Ni, Y. ^{[1
]}

机构：

[1] Univ New Brunswick, Limerick Pulp & Paper Ctr, Fredericton, NB, Canada

来源：

PULP & PAPER-CANADA | 2007年 / 108卷 / 01期

关键词：

oxalates; scaling; peroxide bleaching; mechanical pulps; precipitates; process variables;

D O I：

暂无

中图分类号：

TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];

学科分类号：

0805 ; 080502 ; 0822 ;

摘要：

We determined the effect of various process parameters (hydrogen peroxide charge, caustic soda charge, and bleaching consistency) on the partition between soluble and precipitated oxalate. At a higher peroxide charge or caustic soda charge, more oxalate is in the soluble form. Decreasing the pulp consistency can increase the fraction of soluble oxalate. Also, a partial replacement of NaOH with Mg(OH)(2) as the alkali source during peroxide bleaching can increase the amount of soluble oxalate, thus effectively decreasing oxalate-related scaling.

引用

页码：39 / 43

页数：5

共 4 条

[1] Oxalate formation during peroxide bleaching of mechanical pulps
Yu, L
Ni, YH
APPITA JOURNAL, 2005, 58 (02): : 138 - +
[2] Decreasing calcium oxalate scaling by partial substitution of Mg(OH)2 for NaOH in the peroxide bleaching of mechanical pulps
Yu, L
Ni, YH
TAPPI JOURNAL, 2006, 5 (02): : 9 - 12
[3] Comparison of Oxalate Formation in Peroxide Bleaching of Softwood and Hardwood Mechanical Pulps
He, Z.
Yang, Y.
Ni, Y.
JOURNAL OF PULP AND PAPER SCIENCE, 2008, 34 (03): : 153 - 160
[4] Formation of oxalate from the Mg(OH)2-based peroxide bleaching of mechanical pulps
Yu, L
Rae, M
Ni, Y
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY, 2004, 24 (04) : 341 - 355

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