Effect of Magnesium Dihydroxide on Bleaching of Thermomechanical Pulp Made from Pinus densiflora

Ji-Young Lee; Chul-Hwan Kim; Sol Kwon; Hyunghun Park; Min-Seok Lee; Hyun-Tek Yim

doi:10.7584/JKTAPPI.2017.04.49.2.23

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Effect of Magnesium Dihydroxide on Bleaching of Thermomechanical Pulp Made from Pinus densiflora 소나무로 제조된 열기계펄프의 표백 시 수산화마그네슘의 효과 연구

30 April 2017. pp. 23-29

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Abstract

The conventional NaOH-based peroxide bleaching process has been regarded as an effective option in increasing pulp brightness for thermomechanical pulp (TMP). However, as a strong base, NaOH can cause the dissolution of hemicelluloses into the bleaching effluents and is responsible for the increased COD load and the formation of a significant amount of anionic trash. In recognition of several drawbacks associated with the NaOH-based peroxide bleaching process, magnesium dihydroxide as a weak alkaline source was used to replace sodium hydroxide used for peroxide bleaching of TMP made from domestic pine, Pinus densiflora. Brightness gain of BTMP with Mg(OH)₂ as the sole alkali source was comparable to the NaOH-based bleaching process. The Mg(OH)₂-based bleaching generated less anionic trash as well as lower COD in the bleaching effluents. In conclusion, the change of alkali to Mg(OH)₂ may well prove to be an efficient solution to bleach TMP from the softwood without sacrificing brightness.

Keywords

Peroxide bleaching

magnesium dihydroxide

sodium hydroxide

COD

anionic trash

References

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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 : 49
No :2
Pages :23-29
Received Date : 2017-04-03
Revised Date : 2017-04-10
Accepted Date : 2017-04-14
DOI :https://doi.org/10.7584/JKTAPPI.2017.04.49.2.23

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

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