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Effects of Silicon Content and Causticization Method in Bamboo Pulping Green Liquor on the Property of Lime Mud
  
DOI：10.11980/j.issn.0254-508X.2018.11.005
Key Words:Al-based bentonite  silicon content  caustic method  lime mud quality
Fund Project:国家十二五科技支撑计划项目（2012BAD23B0201）；国家自然科学基金项目（20876092）。
Author NameAffiliation
LIN Tao* College of Bioresources Chemical and Materials Engineering，National Demonstration Center for Experimental Light Chemistry Engineering Education，Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
TIAN Xing-huan College of Bioresources Chemical and Materials Engineering，National Demonstration Center for Experimental Light Chemistry Engineering Education，Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
YIN Xue-feng College of Bioresources Chemical and Materials Engineering，National Demonstration Center for Experimental Light Chemistry Engineering Education，Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
ZHANG Ding-jun College of Bioresources Chemical and Materials Engineering，National Demonstration Center for Experimental Light Chemistry Engineering Education，Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
FU Yue College of Bioresources Chemical and Materials Engineering，National Demonstration Center for Experimental Light Chemistry Engineering Education，Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
FAN Jing College of Bioresources Chemical and Materials Engineering，National Demonstration Center for Experimental Light Chemistry Engineering Education，Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
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Abstract:In this paper， the silicon in the green liquor from bamboo pulping chemical recovery was removed by adding aluminum salt modified bentonite. Through controlling the dosing amount of Al-based bentonite， the bamboo green liquor containing different silicon contents was obtained. Then， the green liquor with different silicon contents was causticized by two kinds of causticization processes i.e. rapid causticization and batch causticization respectively，the lime mud calcium carbonates with different contents of silicon prepared by using different causticization processes were obtained. The whiteness， particle size and crystal morphology of the obtained lime mud calcium carbonate were measured， and the influence of the silicon content and the causticization process on the properties of the lime mud calcium carbonate was analyzed. The results indicated that the presence of silicon was detrimental to the causticization efficiency of bamboo pulping green liquor， and the whiteness and uniformity of lime mud calcium carbonate. The batch causticization method could effectively improve the causticizing efficiency of green liquor and the quality of the corresponding lime mud calcium carbonate.
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