Kev ua ntawv xyoob hauv Suav teb muaj keeb kwm ntev. Cov qauv thiab cov tshuaj lom neeg ntawm xyoob fiber muaj cov yam ntxwv tshwj xeeb. Qhov ntev ntawm cov fiber nruab nrab yog ntev, thiab cov qauv ntawm phab ntsa fiber tshwj xeeb, kev ua tau zoo ntawm lub zog ntawm cov pulp yog qhov zoo, muab cov khoom siv kho qhov muag zoo rau cov pulp bleached: opacity siab thiab lub teeb scattering coefficient. Cov khoom siv raw xyoob lignin (kwv yees li 23% txog 32%) yog siab dua, txiav txim siab nws cov pulp siav nrog alkali thiab sulfide ntau dua (sulfide feem ntau 20% txog 25%), ze rau ntoo coniferous; cov khoom siv raw, hemicellulose thiab silicon ntau dua, tab sis kuj rau kev ntxuav pulp, cov kua dub evaporation thiab cov khoom siv concentration system kev ua haujlwm ib txwm muaj qee qhov teeb meem. Txawm li cas los xij, cov khoom siv raw xyoob tsis yog cov khoom siv raw zoo rau kev ua ntawv.
Yav tom ntej, cov txheej txheem tshuaj lom neeg ntawm xyoob nruab nrab thiab loj, yuav siv cov txheej txheem tshuaj dawb ntawm TCF lossis ECF. Feem ntau, ua ke nrog qhov tob ntawm kev tshem tawm thiab kev tshem tawm cov pa oxygen ntawm cov pulping, kev siv cov txheej txheem tshuaj dawb ntawm TCF lossis ECF, raws li tus lej ntawm cov seem tshuaj dawb sib txawv, xyoob pulp tuaj yeem bleached mus rau 88% ~ 90% ISO dawb.
Kev sib piv ntawm xyoob ECF thiab TCF bleaching
Vim tias xyoob muaj cov lignin ntau, nws yuav tsum tau ua ke nrog kev sib sib zog nqus thiab cov thev naus laus zis oxygen delignification los tswj tus nqi Kappa ntawm cov slurry nkag mus rau ECF thiab TCF (pom zoo <10), siv Eop txhim kho ob-theem ECF bleaching sequence, acid pretreatment lossis Eop ob-theem TCF bleaching sequence, txhua yam tuaj yeem bleach sulphated xyoob pulp mus rau qib dawb siab ntawm 88% ISO.
Cov khoom siv raw ntawm xyoob sib txawv ntawm cov tshuaj dawb sib txawv heev, Kappa txog li 11 ~ 16, txawm tias muaj ob theem tshuaj dawb ECF thiab TCF, cov pulp tsuas tuaj yeem ua tiav qib dawb ntawm 79% txog 85%.
Piv nrog rau TCF xyoob pulp, ECF bleached xyoob pulp muaj tsawg dua bleaching poob thiab siab dua viscosity, uas feem ntau tuaj yeem ncav cuag ntau dua 800ml / g. Tab sis txawm tias niaj hnub TCF bleached xyoob pulp zoo dua, viscosity tsuas yog tuaj yeem ncav cuag 700ml / g. ECF thiab TCF bleached pulp zoo yog qhov tseeb tsis muaj kev sib cav, tab sis kev txiav txim siab tag nrho ntawm qhov zoo ntawm cov pulp, kev nqis peev thiab cov nqi khiav lag luam, xyoob pulp bleaching siv ECF bleaching lossis TCF bleaching, tseem tsis tau xaus. Cov neeg txiav txim siab sib txawv ntawm cov tuam txhab siv cov txheej txheem sib txawv. Tab sis los ntawm kev txhim kho yav tom ntej, xyoob pulp ECF thiab TCF bleaching yuav nyob ua ke ntev.
Cov neeg txhawb nqa ECF bleaching technology ntseeg tias ECF bleached pulp muaj cov pulp zoo dua, nrog rau kev siv cov tshuaj tsawg dua, kev ua haujlwm bleaching zoo, thaum lub kaw lus khoom siv tau laus thiab ruaj khov. Txawm li cas los xij, cov neeg tawm tswv yim ntawm TCF bleaching technology sib cav tias TCF bleaching technology muaj qhov zoo ntawm cov dej khib nyiab tsawg dua los ntawm lub Hoobkas bleaching, cov kev xav tau tiv thaiv xeb tsawg rau cov khoom siv, thiab kev nqis peev tsawg. Sulphate xyoob pulp TCF chlorine-free bleaching kab ntau lawm siv semi-closed bleaching system, cov pa phem ntawm lub Hoobkas bleaching tuaj yeem tswj tau ntawm 5 txog 10m3 / t pulp. Cov dej khib nyiab los ntawm (PO) seem raug xa mus rau qhov chaw oxygen delignification rau kev siv, thiab cov dej khib nyiab los ntawm O seem raug xa mus rau qhov chaw ntxuav sieve rau kev siv, thiab thaum kawg nkag mus rau hauv alkali rov qab. Cov dej khib nyiab acidic los ntawm Q seem nkag mus rau hauv lub kaw lus kho dej khib nyiab sab nraud. Vim yog bleaching tsis muaj chlorine, cov tshuaj tsis yog corrosive, cov khoom siv bleaching tsis tas yuav siv titanium thiab cov hlau stainless tshwj xeeb, cov hlau stainless ib txwm tuaj yeem siv, yog li tus nqi nqis peev qis. Piv nrog rau cov kab tsim khoom siv TCF pulp, cov nqi peev ntawm ECF pulp ntau lawm yuav siab dua 20% txog 25%, nrog rau kev nqis peev ntawm cov kab tsim khoom siv pulp kuj siab dua 10% txog 15%, kev nqis peev hauv cov txheej txheem rov qab siv tshuaj kuj loj dua, thiab kev ua haujlwm nyuaj dua.
Hauv ntej, xyoob pulp TCF thiab ECF bleaching tsim cov dawb siab 88% txog 90% tag nrho xyoob pulp yog ua tau. Pulping yuav tsum tau siv cov thev naus laus zis tob tob, oxygen delignification ua ntej bleaching, tswj cov pulp rau hauv lub kaw lus bleaching Kappa tus nqi, bleaching siv cov txheej txheem bleaching nrog peb lossis plaub qhov bleaching sequences. Cov lus 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 yog Eop (ZQ) (PO) (PO), O (ZQ) (PO) (ZQ) (PO). Vim tias cov tshuaj lom neeg sib xyaw (tshwj xeeb tshaj yog cov ntsiab lus lignin) thiab cov qauv fiber sib txawv ntawm ntau hom xyoob sib txawv, yuav tsum muaj kev tshawb fawb txog kev ua haujlwm ntawm pulping thiab papermaking ntawm ntau hom xyoob sib txawv ua ntej kev tsim kho ntawm cov nroj tsuag los muab kev taw qhia rau kev tsim cov txheej txheem thiab cov xwm txheej tsim nyog.
Lub sijhawm tshaj tawm: Cuaj hlis-14-2024
