Ukwenza iphepha le-bamboo e-China kunomlando omude. I-bamboo fiber morphology kanye nokwakheka kwamakhemikhali kunezici ezikhethekile. Ubude be-fiber obujwayelekile bubude, futhi i-microstructure yodonga lwe-fiber cell ikhethekile, ukushaya ngamandla okusebenza kokuthuthukiswa kwe-pulp kuhle, okunikeza i-bleached pulp izici ezinhle ze-optical: ukukhanya okuphezulu nokuhlakazeka kwe-coefficient yokukhanya. Okuqukethwe kwe-lignin ye-bamboo eluhlaza (okungaba ngu-23% kuya ku-32%) kuphakeme, okunquma ukupheka kwayo kwe-pulp nge-alkali ephakeme ne-sulfide (i-sulfide ngokuvamile i-20% kuya ku-25%), eduze nezinkuni ze-coniferous; izinto zokusetshenziswa, i-hemicellulose kanye ne-silicon okuqukethwe kuphakeme, kodwa futhi ekugezeni kwe-pulp, ukuhwamuka kotshwala obumnyama kanye nohlelo lwemishini yokuhlushwa ukusebenza okuvamile kulethe ubunzima obuthile. Noma kunjalo, i-bamboo eluhlaza akuyona into enhle yokwenza iphepha.
I-future bamboo medium and big-scale chemical pulp mill bleaching system, izosebenzisa inqubo ye-TCF noma ye-ECF yokwenza bleaching. Ngokuvamile, kuhlanganiswe nokujula kokuhlonza kanye nokukhishwa kwe-oksijini ye-pulping, ukusetshenziswa kobuchwepheshe be-TCF noma i-ECF bleaching, ngokwenani lezigaba ezihlukene zokuhlanganisa, i-bamboo pulp ingaxutshwa ibe mhlophe ku-88% ~ 90% ISO.
Ukuqhathaniswa kwe-bamboo ECF kanye ne-TCF bleaching
Ngenxa yokuqukethwe okuphezulu kwe-lignin yoqalo, idinga ukuhlanganiswa nobuchwepheshe bokuhlonza kahle komoyampilo ukuze kulawulwe inani le-Kappa lodaka olungena ku-ECF ne-TCF (kunconyiwe <10), kusetshenziswa i-Eop ethuthukisiwe yezigaba ezimbili zokulandelana kokuxutshwa kwe-ECF, i-asidi. Ukwelashwa ngaphambi kwesikhathi noma ukulandelana kwe-TCF kwezigaba ezimbili kwe-Eop, konke okungenza uhlaka lwe-bamboo oluyi-sulphate lube mhlophe ezingeni eliphezulu lama-88% e-ISO.
Ukusebenza kwe-bleaching yezinto zokusetshenziswa ezihlukene zoqalo kuyehluka kakhulu, i-Kappa iye ku-11 ~ 16 noma ngaphezulu, ngisho noma i-ECF ne-TCF enezigaba ezimbili, i-pulp ifinyelela izinga lobumhlophe elingama-79% ukuya ku-85%.
Uma kuqhathaniswa ne-TCF bamboo pulp, i-ECF bleached bamboo pulp inokulahlekelwa okuncane kokumhlophe kanye ne-viscosity ephakeme, engafinyelela ngaphezu kuka-800ml/g. Kodwa ngisho ne-TCF yesimanje ethuthukisiwe ye-bamboo pulp, i-viscosity ingafinyelela kuphela ku-700ml/g. Ikhwalithi ye-ECF ne-TCF ye-bleached pulp iyiqiniso elingephikiswe, kodwa ukucatshangelwa okuphelele kwekhwalithi ye-pulp, ukutshalwa kwezimali kanye nezindleko zokusebenza, ukuxutshwa kwe-bamboo pulp kusetshenziswa i-ECF bleaching noma i-TCF bleaching, akukakaqedwa. Abenzi bezinqumo zebhizinisi abahlukene basebenzisa izinqubo ezahlukene. Kodwa kusukela enkambweni yentuthuko yesikhathi esizayo, i-bamboo pulp ECF kanye ne-TCF bleaching izoba khona isikhathi eside.
Abasekeli bobuchwepheshe be-ECF bokuhlanza bakholelwa ukuthi i-ECF bleached pulp inekhwalithi engcono ye-pulp, nokusetshenziswa kwamakhemikhali ambalwa, ukusebenza kahle kokushisa okuphezulu, kuyilapho uhlelo lwemishini luvuthiwe futhi luzinzile ukusebenza kokusebenza. Kodwa-ke, abagqugquzeli bobuchwepheshe bokwenza izinto zibe mhlophe kwe-TCF baphikisa ngokuthi ubuchwepheshe bokwenza uketshezi lwe-TCF bunobuhle bokuphuma kwamanzi angcolile amancane aphuma embonini yokuxubha, izidingo eziphansi zokunqanda ukugqwala kwemishini, kanye nokutshalwa kwezimali okuncane. I-sulphate bamboo pulp I-TCF ulayini wokukhiqiza wokuxutshwa kwe-chlorine ongenayo i-chlorine isebenzisa uhlelo lokuxubha oluvalwe kancane, ukushiswa kwamanzi angcolile ezitshalo kungalawulwa ku-5 kuya ku-10m3/t pulp. Amanzi angcolile asuka ku-(PO) athunyelwa esigabeni sokuhlonza umoya-mpilo ukuze asetshenziswe, futhi amanzi angcolile asuka ku-O anikezwa engxenyeni yokuwasha ngesisefo ukuze asetshenziswe, futhi ekugcineni angena ekutholeni i-alkali. Ngenxa ye-bleaching ngaphandle kwe-chlorine, amakhemikhali awaboli, imishini yokuhlanza ayidingi ukusebenzisa i-titanium nensimbi ekhethekile engenasici, insimbi engagqwali evamile ingasetshenziswa, ngakho-ke izindleko zokutshala izimali ziphansi. Uma kuqhathaniswa nolayini wokukhiqiza uginindela we-TCF, izindleko zokutshala izimali zomugqa wokukhiqiza i-ECF zibe ngu-20% kuya ku-25% ngaphezulu, nokutshalwa kwezimali komugqa wokukhiqiza u-pulp nakho kuphezulu ngo-10% kuya ku-15%, ukutshalwa kwezimali ohlelweni lokubuyisela amakhemikhali nakho kukhudlwana, futhi ukusebenza kuyinkimbinkimbi kakhulu.
Ngamafuphi, u-bamboo pulp i-TCF kanye ne-ECF ukukhiqizwa kokumhlophe okuphakeme okungama-88% kuya ku-90% ku-bamboo pulp exutshwe ngokuphelele kungenzeka. I-Pulping kufanele isetshenziswe ekujuleni kobuchwepheshe bokuhlukanisa, ukuhlukanisa umoya-mpilo ngaphambi kokwenza i-bleaching, ukulawula i-pulp ibe yi-bleaching system ye-Kappa value, ukuxubha kusetshenziswa inqubo yokuxubha okulandelanayo okuthathu noma okune kokufiphala. I-ECF ephakanyisiwe yokulandelanisa kokuxubha kwe-bamboo pulp ithi OD(EOP)D(PO), OD(EOP)DP; Ukulandelana kwe-L-ECF bleaching ithi OD(EOP)Q(PO); Ukulandelana kwe-TCF bleaching ithi Eop(ZQ)(PO)(PO), O(ZQ)(PO)(ZQ)(PO). Njengoba ukwakheka kwamakhemikhali (ikakhulukazi okuqukethwe kwe-lignin) kanye ne-fiber morphology kuhluka kakhulu phakathi kwezinhlobo ezahlukene zoqalo, ucwaningo oluhlelekile kufanele lwenziwe mayelana nokusebenza kwe-pulping nokwenza iphepha kwezinhlobo ezahlukene ze-bamboo ngaphambi kokwakhiwa kwesitshalo ukuze kuhlinzekwe isiqondiso sokuthuthukiswa kohlaka oluphusile. cubungula imizila nezimo.
Isikhathi sokuthumela: Sep-14-2024
