Ukwenza iphepha le-bamboo e-China kunembali ende. I-bamboo fiber morphology kunye nokwakheka kweekhemikhali kuneempawu ezikhethekileyo. Umyinge we-fiber ubude ubude, kwaye i-microstructure ye-fiber cell wall ikhethekileyo, ukubetha ngamandla okusebenza kophuhliso lwe-pulp kulungile, ukunika i-bleached pulp iimpawu ezintle ezibonakalayo: i-opacity ephezulu kunye ne-coefficient yokusabalalisa ukukhanya. Umxholo we-bamboo we-lignin ekrwada (malunga ne-23% ukuya kwi-32%) iphezulu, imisela ukupheka kwayo i-pulp nge-alkali ephezulu kunye ne-sulfide (i-sulfide ngokubanzi i-20% ukuya kwi-25%), kufuphi ne-coniferous wood; imathiriyeli ekrwada, i-hemicellulose kunye nomxholo we-silicon uphezulu, kodwa nakwi-pulp yokuhlamba, ukuphuphuma kotywala obumnyama kunye nenkqubo yoxinaniso lwezixhobo zokusebenza eziqhelekileyo zisa ubunzima. Nangona kunjalo, imathiriyeli ekrwada ye-bamboo ayiyonto ilungileyo yokwenza iphepha.
I-bamboo yekamva eliphakathi kunye nenkulu-scale chemical pulp mill inkqubo bleaching, iya kusebenzisa TCF okanye ECF inkqubo bleaching. Ngokuqhelekileyo, kudityaniswe nobunzulu be-delignification kunye ne-oxygen delignification ye-pulping, ukusetyenziswa kwe-TCF okanye i-ECF iteknoloji yokucoca i-bleaching, ngokwenani lamacandelo ahlukeneyo okucoca, i-bamboo pulp inokuxutywa kwi-88% ~ 90% yobumhlophe be-ISO.
Ukuthelekiswa kwe-bamboo ECF kunye ne-TCF bleaching
Ngenxa yomgangatho ophezulu we-lignin ye-bamboo, kufuneka idityaniswe kunye nobuchwepheshe obunzulu bokulungiswa kwe-oksijini kunye ne-oxygen delignification ukuze ulawule ixabiso le-Kappa le-slurry engena kwi-ECF kunye ne-TCF (ecetyiswayo <10), usebenzisa i-Eop ephuculweyo ye-ECF yezigaba ezimbini zokulandelelana kwe-bleaching, i-asidi. Unyango lwangaphambili okanye i-Eop enamanqanaba amabini e-TCF yolandelelwano lwe-bleaching, zonke ezinokuthi zitshise i-pulp ye-bamboo e-sulphated ukuya kwinqanaba lobumhlophe obuphezulu be-88% ye-ISO.
Ukusebenza kwe-bleaching yemathiriyeli ekrwada eyahlukeneyo ye-bamboo yahluka kakhulu, iKappa ukuya kwi-11 ~ 16 okanye kunjalo, nokuba kunye nezigaba ezibini zokucoca i-ECF kunye ne-TCF, i-pulp inokufikelela kuphela i-79% ukuya kwi-85% inqanaba lobumhlophe.
Xa kuthelekiswa nentlala ye-bamboo ye-TCF, i-ECF ye-bamboo pulp efakwe i-bleached inelahleko encinci ye-bleaching kunye ne-viscosity ephezulu, enokufikelela ngokubanzi ngaphezu kwe-800ml / g. Kodwa ne-TCF yangoku ephuculweyo ye-bamboo pulp, i-viscosity inokufikelela kuphela kwi-700ml/g. I-ECF kunye ne-TCF bleached pulp quality yinyani engenakuphikiswa, kodwa ukuqwalaselwa okubanzi komgangatho wepulp, utyalo-mali kunye neendleko zokusebenza, i-bamboo pulp bleaching usebenzisa i-ECF bleaching okanye i-TCF bleaching, ayikagqitywa. Abenzi bezigqibo bamashishini abohlukeneyo basebenzisa iinkqubo ezahlukeneyo. Kodwa ukusuka kwindlela yophuhliso yexesha elizayo, i-bamboo pulp ECF kunye ne-TCF bleaching iya kuhlala ixesha elide.
Abaxhasi be-ECF bleaching technology bakholelwa ukuba i-ECF bleached pulp inomgangatho ongcono we-pulp, kunye nokusetyenziswa kweekhemikhali ezimbalwa, ukusebenza kakuhle kwe-bleaching, ngelixa inkqubo yezixhobo ikhulile kwaye isebenza ngokuzinzileyo. Nangona kunjalo, abaxhasi beteknoloji ye-TCF yokucoca itekhnoloji yokucoca itekhnoloji ye-TCF ineengenelo zokukhutshelwa kwamanzi amdaka amancinci ukusuka kwiplanti yokucoca, iimfuno eziphantsi zokuchasana nomhlwa kwisixhobo, kunye notyalo-mali oluphantsi. Sulphate bamboo pulp TCF chlorine-free bleaching umgca wemveliso usebenzisa semi-evaliweyo bleaching inkqubo, ukuxutywa bleaching plant ukukhutshwa kwamanzi amdaka kunokulawulwa 5 ukuya 10m3/t pulp. Amanzi amdaka asuka kwicandelo (PO) athunyelwa kwicandelo lokulungiswa kweoksijini ukuze asetyenziswe, kwaye amanzi amdaka asuka kwicandelo le-O anikezelwa kwicandelo lokuhlanjwa kwesisefo ukuze asetyenziswe, aze ekugqibeleni angene ekubuyiseleni i-alkali. Ngenxa ye-bleaching ngaphandle kweklorini, iikhemikhali azikho i-corrosive, izixhobo ze-bleaching azidingeki ukusebenzisa i-titanium kunye nensimbi ekhethekileyo engenasici, isinyithi esiqhelekileyo sinokusetyenziswa, ngoko ke iindleko zotyalo-mali ziphantsi. Xa kuthelekiswa nomgca wemveliso we-TCF pulp, iindleko zotyalo-mali ze-ECF ukuya kuma-20% ukuya kuma-25% aphezulu, kunye notyalo-mali lomgca wemveliso we-pulp lukwa-10% ukuya kwi-15% ephezulu, utyalo-mali kwinkqubo yokubuyisela imichiza nayo inkulu, kwaye umsebenzi unzima ngakumbi.
Ngokufutshane, i-bamboo pulp i-TCF kunye ne-ECF ukuveliswa kobumhlophe obuphezulu obuphezulu be-88% ukuya kwi-90% yepulp ye-bamboo ebleached ngokupheleleyo inokwenzeka. I-Pulping kufuneka isetyenziswe kubuchwephesha be-degignification, i-oxygen delignification phambi kokuba i-bleaching, ukulawula i-pulp kwisistim ye-bleaching ixabiso le-Kappa, ukuxutywa kwe-bleaching ngokusebenzisa inkqubo yokuxutywa kweblekshini kunye nolandelelwano lwe-bleaching ezintathu okanye ezine. I-ECF ecetywayo yolandelelwano lwe-bleaching ye-bamboo pulp yi-OD(EOP)D(PO), OD(EOP)DP; I-L-ECF yokulandelelanisa i-bleaching yi-OD(EOP)Q(PO); Ulandelelwano lwe-TCF bleaching yi-Eop(ZQ)(PO)(PO), O(ZQ)(PO)(ZQ)(PO). Njengoko ukwakheka kweekhemikhali (ingakumbi umxholo we-lignin) kunye ne-fiber morphology yahluka kakhulu phakathi kweentlobo ezahlukeneyo ze-bamboo, isifundo esicwangcisiweyo kufuneka siqhutywe kwi-pulping kunye nokusebenza kwephepha kweentlobo ezahlukeneyo ze-bamboo ngaphambi kokwakhiwa kwesityalo ukubonelela ngesikhokelo sophuhliso olufanelekileyo. inkqubo iindlela kunye nemiqathango.
Ixesha lokuposa: Sep-14-2024
