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Desilication Technology for the Green Liquor in Alkali Recovery System and Its Application
  
DOI:10.11980/j.issn.0254-508X.2018.10.006
Key Words:precipitate dissolved silica from green liquor with CO2 method  lower residue alkali  washing very easy  lime mud calcium carbonate filler
Author NameAffiliation
ZHANG Xiao-hong Minteq High-end Refractory Material Co. Ltd., Suzhou Jiangsu Province 215126 
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Abstract:The dissolved silica in green liquor(GL) was precipitated by using aesation with CO2, the optimized conditions were as follows: GL TSS, less than 60 mg/L, CO2gas rate 0.5~1 L/min, reactor temperature 70~90 ℃, pH range 9.8~10.2, Al2(SO4)3 dosage 1.5 g/L, silica removal reached 96%.Before desilication, GL silica content 2.98%, Na 4.70%, after desilication, GL silica content 0.12%, Na 4.56%, it showed that the total alkali content basically unchanged in GL, silica removal in GL was very efficrent.The method was very easy. The lime mud calcium carbonate had very low silica content, very easy to be washed and contained less,.residue alkali it could improve the lime mud calcium carbonate quality,.was beneficial to its application in papermaking.Desilication lime mud calcium carbonate could replace PCC as paper filler.
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