Ukwenziwa kwephepha le-bamboo eTshayina kunembali ende. Imo yefayibha ye-bamboo kunye nokwakheka kweekhemikhali kuneempawu ezikhethekileyo. Ubude obuqhelekileyo befayibha bude, kwaye isakhiwo se-microstructure yodonga lwe-fiber cell sikhethekile, ukubetha ngamandla ophuhliso lwe-pulp kukuhle, okunika i-bleached pulp iipropati ezilungileyo zokukhanya: i-opacity ephezulu kunye ne-coefficient yokusasaza kokukhanya. Umxholo we-lignin we-bamboo eluhlaza (malunga ne-23% ukuya kwi-32%) uphezulu, nto leyo egqiba ukupheka kwe-pulp yayo nge-alkali ephezulu kunye ne-sulfide (i-sulfide ngokubanzi yi-20% ukuya kwi-25%), kufutshane nomthi we-coniferous; izinto ezikrwada, i-hemicellulose kunye nomxholo we-silicon uphezulu, kodwa nakwinkqubo yezixhobo zokuhlamba i-pulp, ukufuma kotywala obumnyama kunye noxinzelelo ukusebenza kwesiqhelo kuzise ubunzima. Nangona kunjalo, izinto ezikrwada ze-bamboo azikho zixhobo zilungileyo zokwenza iphepha.
Inkqubo yokufunxa i-bamboo medium kunye ne-large-scale chemical pulp mill, ngokusisiseko iya kusebenzisa inkqubo yokufunxa i-TCF okanye i-ECF. Ngokubanzi, xa zidityaniswe nobunzulu bokufunxa kunye nokufunxa i-oxygen ye-pulping, ukusetyenziswa kwetekhnoloji yokufunxa i-TCF okanye i-ECF, ngokwenani lamacandelo ahlukeneyo okufunxa, i-bamboo pulp inokufunxa i-88% ~ 90% ye-ISO whiteness.
Ukuthelekiswa kwe-bamboo ECF kunye ne-TCF bleaching
Ngenxa yomxholo ophezulu we-lignin kwi-bamboo, kufuneka idityaniswe ne-deep delignification kunye ne-oxygen delignification technologies ukulawula ixabiso le-Kappa le-slurry engena kwi-ECF kunye ne-TCF (ecetyiswayo <10), kusetyenziswa i-Eop enhanced two-stage ECF bleaching sequence, i-acid pretreatment okanye i-Eop two-stage TCF bleaching sequence, zonke ezinokuthi zi-bleach sulphated bamboo pulp ziye kwinqanaba eliphezulu lobumhlophe be-88% ISO.
Ukusebenza kokumhlophe kwezinto ezahlukeneyo ze-bamboo kwahluka kakhulu, ukusuka kwi-Kappa ukuya kwi-11 ukuya kwi-16 okanye ngaphezulu, nokuba kukho ukumhlophe okunezigaba ezimbini ze-ECF kunye ne-TCF, i-pulp inokufikelela kuphela kwinqanaba lobumhlophe eliyi-79% ukuya kwi-85%.
Xa kuthelekiswa ne-TCF bamboo pulp, i-ECF bleached bamboo pulp ayinayo i-bleach eninzi kunye ne-viscosity ephezulu, enokuthi ifikelele ngaphezulu kwe-800ml/g. Kodwa kwane-TCF bleached bamboo pulp yanamhlanje, i-viscosity inokufikelela kuphela kwi-700ml/g. Umgangatho we-ECF kunye ne-TCF bleached pulp yinyani engenakuphikiswa, kodwa ukuqwalaselwa ngokubanzi komgangatho we-pulp, iindleko zotyalo-mali kunye nokusebenza, i-bamboo pulp bleaching esebenzisa i-ECF bleaching okanye i-TCF bleaching, akukagqitywa. Abenzi bezigqibo ezahlukeneyo zeshishini basebenzisa iinkqubo ezahlukeneyo. Kodwa ngokwendlela yophuhliso yexesha elizayo, i-bamboo pulp ECF kunye ne-TCF bleaching ziya kuhlala ixesha elide.
Abaxhasi beteknoloji yokufunxa i-ECF bakholelwa ukuba i-pulp efunxa i-ECF inomgangatho ongcono we-pulp, ngokusebenzisa iikhemikhali ezimbalwa, ukusebenza kakuhle kwe-bleaching, ngelixa inkqubo yezixhobo ivuthiwe kwaye isebenza kakuhle. Nangona kunjalo, abaxhasi beteknoloji yokufunxa i-TCF bathi iteknoloji yokufunxa i-TCF ineengenelo zokukhupha amanzi amdaka amaninzi kwisityalo sokufunxa, iimfuno eziphantsi zokulwa nokugqwala kwezixhobo, kunye notyalo-mali oluphantsi. Umgca wemveliso yokufunxa i-sulphate bamboo pulp TCF chlorine-free chlorine usebenzisa inkqubo yokufunxa amanzi amdaka evaliweyo, ukukhutshwa kwamanzi amdaka kwisityalo sokufunxa kunokulawulwa kwi-pulp ye-5 ukuya kwi-10m3/t. Amanzi amdaka avela kwicandelo (PO) athunyelwa kwicandelo lokuchonga ioksijini ukuze asetyenziswe, kwaye amanzi amdaka avela kwicandelo le-O anikezelwa kwicandelo lokuhlamba ngesihluzo ukuze asetyenziswe, kwaye ekugqibeleni angena ekubuyiselweni kwe-alkali. Amanzi amdaka ane-asidi avela kwicandelo le-Q angena kwinkqubo yonyango lwamanzi amdaka angaphandle. Ngenxa yokufunxa ngaphandle kwe-chlorine, iikhemikhali azinakonakalisa, izixhobo zokufunxa akufuneki zisebenzise i-titanium kunye nentsimbi ekhethekileyo engagqwali, intsimbi eqhelekileyo engagqwali ingasetyenziswa, ngoko ke iindleko zotyalo-mali ziphantsi. Xa kuthelekiswa nomgca wemveliso ye-TCF pulp, iindleko zotyalo-mali lomgca wemveliso ye-ECF pulp ziphezulu ngama-20% ukuya kuma-25%, kunye notyalo-mali lomgca wemveliso ye-pulp nalo luphezulu ngama-10% ukuya kwi-15%, utyalo-mali kwinkqubo yokubuyisela iikhemikhali nalo lukhulu, kwaye umsebenzi unzima ngakumbi.
Ngamafutshane, imveliso ye-bamboo pulp TCF kunye ne-ECF bleaching ye-whiteness ephezulu ukusuka kwi-88% ukuya kwi-90% ye-bamboo pulp e-bleached ngokupheleleyo inokwenzeka. I-Pulping kufuneka isetyenziswe kwitekhnoloji yokwahlulahlula ngokunzulu, i-oxygen deignification ngaphambi kokuba i-bleached, ulawulo lwe-pulp kwinkqubo ye-bleaching ixabiso le-Kappa, i-bleaching isebenzisa inkqubo ye-bleaching eneendlela ezintathu okanye ezine ze-bleaching. I-ECF bleaching sequence ecetyiswayo ye-bamboo pulp yi-OD(EOP)D(PO), OD(EOP)DP; i-L-ECF bleaching sequence yi-OD(EOP)Q(PO); i-TCF bleaching sequence yi-Eop(ZQ)(PO)(PO), O(ZQ)(PO)(ZQ)(PO). Njengoko ukwakheka kweekhemikhali (ingakumbi umxholo we-lignin) kunye ne-fiber morphology zahlukile kakhulu phakathi kweentlobo ezahlukeneyo ze-bamboo, kufuneka kwenziwe uphando olucwangcisiweyo malunga nokusebenza kwe-pulping kunye nephepha leentlobo ezahlukeneyo ze-bamboo ngaphambi kokwakhiwa kwesityalo ukubonelela ngesikhokelo sophuhliso lweendlela ezifanelekileyo zenkqubo kunye neemeko.
Ixesha leposi: Sep-14-2024
