脱墨浆水回路处理对成浆质量影响的分析

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1、STUDYOFDIPRECYCLEDⅥiATERTREATMENTIMPACTONTHEQUALITYoFPULPABSTRACTThisthesiscomparedAndritzDIPlinewithMestoDIPlinefromrawmaterials，equipments，papertypesandwaterloops．AndritzDIPlinebegantoworkonAugust2009atyueyangpapergroup．MestoDIPlinewasbuiltin2003．Thenstudiedthewaterloopso

2、fAndritzDIP1inefromfivesections，andgetconclusionsaSfollow：(1)WaterinDAF1andwaterinDAF2weretreatedby5differentcoagulants．4撑sample。SCODremovalrateiSbetween70％to90％．DecolorizationrateiSabout90％．SSremovalrateiSabout75％．Treatmenteffectisbetterthanothers．(2)Thereactionof3differen

3、tkindsofflocculantswithPACshowthatR6MNo．2formedlargefloe，decolorizationratereached90％．(3)Use6ppmCPAMadd70ppmPACtotreatwaterinDAFlcangetthebestresults．Use5ppmCPAMadd30ppmPACtotreatthewaterintheloopofDAF2willbegood．ButincreasetheamountofPACwillexacerbatetheformationofstickies

4、indilutedpulp．(4)CombinedwithAndeliziDIPlinewhitewaterflow，find7keypoints．sampletestsshowthewhitewatersystemiSabasiccircuit．WaterinDAF2wastreatedbeRer．Hi曲qualitywaterbackforpost-flotation，bleachingstage，pulpbrightnessvalueincreaseda10t．DAF1workedwellatsuspendedsolidsandturb

5、idityremoval，butnotgoodatCOD，PCDremoval．Waterin3slotsalsogotbetterwiththefiltrateturbiditybackwardproductionprocess．Thesesevenpositions’waterusedfordeinking，bleaching，foundthatincreasethepulpingtemperature，pulpconsistencycouldexacerbatetheCODinwhitewater．(5)TherearealOtofst

6、ickiesinDIPwhitewater．TwOsuper—airflotationdeviceworkswellatthestickiesremoveeffect．DAF1remoralrateat75％，DAF2asmuchas91％．However．stickiesmayaccumulatewiththesystem’soperation．Toensurethequalityofproduct，weneedregulartestsonthestickiesofwhitewater．KEYWORDS：DIP,Whitewater,DAF

7、,Coagulant，Flocculant，Stickies．II目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．IABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．II1绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1研究背景和意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1．1废纸制浆的意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1．2白水

8、封闭循环的紧迫性和必要性⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．1．3白水封闭循环的途径⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．21．1．4脱墨浆废水特性