Sizing Efficiency of AKD in Causticizing Calcium Carbonate Filled Paper

Jian Wang; Ling Liu; Yong-jian Xu

doi:10.7584/ktappi.2014.46.2.001

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2014 Vol.46, Issue 2 Next Page

Sizing Efficiency of AKD in Causticizing Calcium Carbonate Filled Paper

30 April 2014. pp. 1-7

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Abstract

Causticizing calcium carbonate (CCC) is produced as a by-product in the causticization step of the kraft pulping process. It is often calcined in a rotary lime kiln after being dewatered and reused in the causticizing process. But for the China mill, the conventional recycled way is difficult because the CCC is mainly obtained from non-wood pulping materials, which higher silicon content led to serious silicon obstacle. So it is often discarded as solid waste or used in landfill after dewatering and secondary pollution is brought. In order to prevent its secondary pollution, recent years, the CCC is used as a filler in China papermaking industry. In mill trials, the CCC can be used to replace an amount of precipitated calcium carbonate (PCC). Unfortunately, the application scope and dosage of CCC have been limited due to its lower sizing efficiency than PCC. In this study, the reason for the lower sizing efficiency of alkyl ketene dimer (AKD) when CCC was used as a filler was investigated. The results showed that the materials in green liquid, such as insoluble matter in green liquid, silicon and metal ions, were a little influence on the sizing efficiency of AKD. The higher BET and BJH pore volume of the CCC were the main reason for lower sizing efficiency of AKD when it was used as filler.

Keywords

Causticizing calcium carbonate

sizing efficiency

AKD

filler

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 46
No :2
Pages :1-7
Received Date : 2013-05-12
Revised Date : 2014-02-23
Accepted Date : 2014-03-13
DOI :https://doi.org/10.7584/ktappi.2014.46.2.001

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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