Xyoob ntawv ua nyob rau hauv Suav teb muaj keeb kwm ntev. Xyoob fiber ntau morphology thiab tshuaj muaj pes tsawg leeg muaj cov yam ntxwv tshwj xeeb. Qhov nruab nrab fiber ntau ntev ntev, thiab cov microstructure ntawm cov phab ntsa fiber ntau yog tshwj xeeb, ntaus hauv lub zog ntawm cov ntaub so ntswg kev loj hlob zoo, muab cov bleached pulp zoo optical zog: siab opacity thiab lub teeb scattering coefficient. Xyoob raw khoom lignin cov ntsiab lus (li 23% mus rau 32%) yog siab dua, txiav txim siab nws cov pulp ua noj nrog ntau dua alkali thiab sulfide (sulfide feem ntau 20% mus rau 25%), ze rau cov ntoo coniferous; raw cov ntaub ntawv, hemicellulose thiab silicon cov ntsiab lus yog siab dua, tab sis kuj mus rau lub pulp ntxuav, dub cawv evaporation thiab concentration khoom system ib txwm ua hauj lwm tau coj ib co teeb meem. Txawm li cas los xij, xyoob raw khoom tsis yog cov khoom siv zoo rau kev ua ntawv.
Yav tom ntej xyoob nruab nrab thiab loj-scale chemical pulp zeb bleaching system, yuav pib siv TCF los yog ECF bleaching txheej txheem. Feem ntau hais lus, ua ke nrog qhov tob ntawm delignification thiab oxygen deignification ntawm pulping, kev siv TCF los yog ECF bleaching technology, raws li tus naj npawb ntawm cov bleaching sib txawv, xyoob pulp tuaj yeem bleached rau 88% ~ 90% ISO whiteness.
Kev sib piv ntawm xyoob ECF thiab TCF bleaching
Vim yog cov ntsiab lus ntawm lignin siab ntawm xyoob, nws yuav tsum tau ua ke nrog kev sib sib zog nqus delignification thiab oxygen delignification technologies los tswj Kappa tus nqi ntawm cov slurry nkag ECF thiab TCF (pom zoo <10), siv Eop txhim kho ob-theem ECF bleaching sequence, acid pretreatment los yog Eop ob-theem TCF bleaching sequence, tag nrho cov uas muaj peev xwm bleach sulphated xyoob pulp mus rau ib tug siab whiteness ntawm 88% ISO.
Kev ua haujlwm bleaching ntawm cov ntaub ntawv raw ntawm xyoob sib txawv heev, Kappa mus rau 11 ~ 16 los yog li ntawd, txawm tias muaj ob-theem bleaching ECF thiab TCF, lub pulp tuaj yeem ua tiav 79% mus rau 85% whiteness theem.
Piv nrog TCF xyoob pulp, ECF bleached xyoob pulp muaj tsawg bleaching poob thiab ntau dua viscosity, uas feem ntau muaj peev xwm ncav cuag ntau tshaj 800ml / g. Tab sis txawm tias qhov kev txhim kho niaj hnub TCF bleached xyoob pulp, viscosity tsuas yog ncav cuag 700ml / g. ECF thiab TCF bleached pulp zoo yog qhov tsis txaus ntseeg, tab sis kev xav txog qhov zoo ntawm cov ntaub so ntswg, peev thiab kev khiav hauj lwm cov nqi, xyoob pulp bleaching siv ECF bleaching los yog TCF bleaching, tseem tsis tau xaus. Cov tuam txhab txiav txim siab sib txawv siv cov txheej txheem sib txawv. Tab sis los ntawm txoj kev loj hlob yav tom ntej, xyoob pulp ECF thiab TCF bleaching yuav nyob ua ke rau lub sijhawm ntev.
Cov neeg txhawb nqa ntawm ECF bleaching thev naus laus zis ntseeg tias ECF bleached pulp muaj cov khoom siv zoo dua qub, nrog rau kev siv cov tshuaj tsawg dua, kev ua haujlwm siab bleaching, thaum cov cuab yeej siv tau zoo thiab kev ua haujlwm ruaj khov. Txawm li cas los xij, cov neeg tawm tswv yim ntawm TCF bleaching thev naus laus zis sib cav tias TCF tshuaj dawb tshuab muaj qhov zoo ntawm cov dej khib nyiab tsawg dua los ntawm cov nroj tsuag tshuaj dawb, tsis tshua muaj kev tiv thaiv corrosion rau cov khoom siv, thiab kev nqis peev tsawg. Sulphate xyoob pulp TCF chlorine-free bleaching ntau lawm kab txais ib nrab kaw bleaching system, bleaching cog cov dej khib nyiab tuaj yeem tswj tau ntawm 5 txog 10m3 / t pulp. Cov dej khib nyiab los ntawm (PO) seem raug xa mus rau cov pa oxygen delignification seem rau kev siv, thiab cov dej khib nyiab los ntawm O seem yog muab rau sieve ntxhua khaub ncaws rau kev siv, thiab thaum kawg nkag mus rau hauv alkali rov qab.Acidic wastewater los ntawm Q seem nkag mus rau sab nraud pov tseg kev kho system. Vim yog cov tshuaj dawb huv uas tsis muaj tshuaj chlorine, cov tshuaj tsis muaj corrosive, cov khoom siv tshuaj dawb tsis tas yuav siv cov titanium thiab cov hlau tshwj xeeb stainless hlau, cov hlau zoo tib yam tuaj yeem siv tau, yog li cov nqi peev tsawg. Piv nrog rau TCF pulp ntau lawm kab, ECF pulp ntau lawm kab peev nqi yuav tsum yog 20% mus rau 25% siab dua, nrog rau cov pulp ntau lawm kab peev kuj yog 10% mus rau 15% siab dua, kev nqis peev nyob rau hauv cov tshuaj rov qab system kuj loj dua, thiab kev khiav hauj lwm yog complex.
Nyob rau hauv luv luv, xyoob pulp TCF thiab ECF bleaching ntau lawm whiteness 88% mus rau 90% tag nrho bleached xyoob pulp yog ua tau. Pulping yuav tsum tau siv nyob rau hauv qhov tob delignification technology, oxygen delignification ua ntej bleaching, tswj cov pulp mus rau hauv lub bleaching system Kappa nqi, bleaching siv bleaching txheej txheem nrog peb los yog plaub bleaching sequences. Pom zoo ECF bleaching sequence rau xyoob pulp yog OD(EOP)D(PO), OD(EOP)DP; L-ECF bleaching sequence yog OD(EOP)Q(PO); TCF bleaching sequence is Eop(ZQ)(PO)(PO), O(ZQ)(PO)(ZQ)(PO). Raws li cov tshuaj muaj pes tsawg leeg (tshwj xeeb tshaj yog cov ntsiab lus lignin) thiab fiber ntau morphology sib txawv heev ntawm ntau hom xyoob, ib txoj kev tshawb fawb yuav tsum tau ua ntawm pulping thiab papermaking kev ua tau zoo ntawm cov xyoob sib txawv ua ntej kev tsim kho ntawm cov nroj tsuag los muab kev taw qhia rau kev txhim kho tsim nyog. txheej txheem kev thiab tej yam kev mob.
Post lub sij hawm: Sep-14-2024
