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Study on Fiber Recovery Technology from Mix Office Waste Fine Screen Reject
  
DOI：10.11980/j.issn.0254-508X.2018.10.002
Key Words:high frequency defibering  mix office waste  fine screen reject  macro-stickies  dirt
Fund Project:“政府间国际科技创新合作”重点专项项目（项目编号：2016YFE0114700）。
Author NameAffiliation
SU Zhen-hua1，2，* 1.China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102；2.National Engineering Lab for Pulp and Paper， Beijing， 100102 
WEN Biao1， 2 1.China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102；2.National Engineering Lab for Pulp and Paper， Beijing， 100102 
ZHANG Yu1， 2 1.China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102；2.National Engineering Lab for Pulp and Paper， Beijing， 100102 
FAN Shu-jie1， 2 1.China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102；2.National Engineering Lab for Pulp and Paper， Beijing， 100102 
PENG Feng3 3.Beijing Forestry University, Beijing, 100083 
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Abstract:The treatment of fine screen reject of mix office waste （MOW） pulping by high frequency defibering and air floatation was studied in this paper. The results showed that high frequency defibering could remove and break up the macro-stickies from the fine screen reject， and the total removal rate of macro-stickies could reach 39.3%.The floatation could further separate the free macro-stickies from the discharge system. When the flotation reject rates were 9.1%,22.2% and 32.7%， the removal rates of macro-stickies could reach 88.5%， 89.5% and 98.2%， respectively further， the large size dirt could be separated from the system by high frequency defibering and the removal rate of large size dirt （≥0.1 mm2） could reach 36.4%～38.6%.Floatation had further removal effect on dirt， and there was no obvious selectivity to dirt size.When the flotation reject rates were 9.1%,22.2% and 32.7%，the dirt removal rates were 71.3%,77.7%and 80.8%， respectively. The high frequency defibering had little effect on the brightness of the pulp， while the high frequency defibering could separate the ink particles from the fiber and disperse them to a certain extent. The final ERIC removal rate could reach more than 49.3%.High frequency defibering combined with floatation to recover MOW fine screen reject could increase paper tensile strength and bursting strength， by 20.2% ～23.5% and 29.3%～32.3%， respectively， but the effect on tearing resistance was not obvious.
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