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Effect of the Particle Size of Mg（OH）2 on the Oxygen Delignification of Radiata Pine Kraft Pulp
  
DOI：10.11981/j.issn.1000-6842.2019.03.13
Key Words:radiata pine kraft pulp； Mg（OH）2； transition metal ion； oxygen delignification； viscosity
Fund Project:“十三五”国家重点研发项目（项目编号：2017YFB0307900）；制浆造纸科学与技术教育部/山东省重点实验室开放资金资助（项目编号：KF201601）。
Author NameAffiliation
NING Dengwen College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 
CHENG Yanan College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 
FU Changming College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 
CHEN Liu College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 
HUANG Hai College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 
CAO Shilin College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 
HUANG Fang* College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108；Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education/Shandong Province， Qilu University of Technology， Ji’nan， Shandong Province， 250353 
NI Yonghao College of Materials Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108；Department of Chemical Engineering， University of New Brunswick， Fredericton， Canada， E3B 5A3 
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Abstract:
      To further explore the mechanism of magnesium salt as a cellulose protectant in oxygen delignification， different particle sizes （20， 50， 100， 200， 500 nm） of Mg（OH）2 were added in the oxygen delignification system， various transition metal ions （Cu2+， Mn2+ and Fe3+） were introduced into the pulp before the addition of magnesium salts. The effects of Mg（OH）2 on the pulp viscosity and Kappa numbers were studied. The results showed that Mg（OH）2 with different particle sizes had no significant effects on Kappa number and lignin removal rate during oxygen delignification. However， the smaller particle size of Mg（OH）2 had superior pulp viscosity protection ability than the bigger particle size. The smaller particle size of Mg（OH）2 was added in oxygen delignification， the pulp had lower viscosity reduction and greater handsheet physical strength．
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