Polyacrylamideyog ib qho khoom siv dav dav hauv kev lag luam ntawv. Polyacrylamide (PAM), ua ib qho polymer uas yaj tau hauv dej, muaj cov khoom zoo heev, ua kom tuab, tawg thiab lwm yam khoom. Yuav siv rau ntau yam txheej txheem sib txawv nrog ntau yam haujlwm. Hauv kev lag luam ua ntawv, PAM ua lub luag haujlwm tseem ceeb. Nws tau coj cov txiaj ntsig kev lag luam tseem ceeb rau kev lag luam ua ntawv los ntawm kev txhim kho cov khoom ntawm pulp thiab ua kom muaj kev ua haujlwm zoo ntawm cov tshuab ntawv. Tsab xov xwm no yuav tham txog kev siv polyacrylamide hauv kev tsim ntawv thiab nws cov txiaj ntsig rau kev txhim kho kev ua haujlwm zoo.
Cov khoom tseem ceeb thiab kev ua haujlwm ntawm polyacrylamide
Polyacrylamide yog ib qho polymer molecular siab uas tuaj yeem muab faib ua nonionic, anionic, cationic thiab amphoteric hom raws li nws cov khoom them. Thaum PAM yaj hauv dej, thiab nws cov qauv molecular ntev ua rau nws muaj cov haujlwm zoo heev xws li flocculation, thickening, retention assistance, thiab filtration assistance. Hauv kev lag luam ntawv, polyacrylamide feem ntau yog siv rau hauv cov hauv qab no:
1. Kev pab txhawb kom khaws cia tau cov ntaub ntawv:
Cov tshuaj PAM muaj cov qauv saw ntev thiab tuaj yeem nqus tau rau ntawm qhov chaw ntawm cov fibers thiab cov khoom sau los ua cov choj. Yog li ntawd, nws thiaj li txhim kho qhov ceev ntawm cov khoom sau thiab cov fibers ntawm daim ntawv web. Txo qhov poob ntawm cov fiber hauv dej dawb thiab txo qhov poob ntawm cov khoom siv raw. Los ntawm kev nce qhov ceev ntawm cov khoom sau thiab cov fibers, cov khoom siv lub cev ntawm daim ntawv xws li kev du, kev luam tawm, thiab lub zog tuaj yeem txhim kho.
2. Kev pab lim dej:
Txhim kho qhov kev ua haujlwm ntawm cov dej ntws ntawm cov pulp, ua kom cov txheej txheem lim dej sai dua thiab txo kev siv hluav taws xob.
3. Cov khoom ua kom cov dej khov:
Ua kom cov dej ntws tawm sai dua: PAM tuaj yeem ua rau cov fibers me me, cov khoom sau thiab lwm yam khoom uas raug tshem tawm hauv cov pulp ua rau cov khoom loj loj, ua kom cov dej ntws tawm sai dua thiab ua kom cov dej ntws tawm sai dua, thiab txo cov nqi kho cov dej ntws.
Txhim kho qhov zoo ntawm dej: PAM tuaj yeem tshem tawm cov khoom tawg thiab cov organic hauv cov dej khib nyiab, txo BOD thiab COD hauv cov dej khib nyiab, txhim kho qhov zoo ntawm dej, thiab txo cov pa phem rau ib puag ncig.
4. Cov tshuaj yaj tawm:
Tiv thaiv kev sib sau ua ke ntawm cov fiber: PAM tuaj yeem tiv thaiv kev sib sau ua ke ntawm cov fiber hauv cov pulp, txhim kho qhov sib xws ntawm cov pulp, thiab txhim kho qhov zoo ntawm daim ntawv.
Daim ntawv thov ntawm polyacrylamide hauv kev siv tshuab ua ntawv
1. Theem npaj cov khoom noj
Thaum lub sijhawm ua cov pulp, cov fibers zoo thiab cov fillers yooj yim ploj mus nrog cov dej khib nyiab, ua rau muaj kev pov tseg cov khoom siv thiab kev ua qias tuaj rau ib puag ncig. Kev siv cationic polyacrylamide ua ib qho kev pab khaws cia tuaj yeem ntes thiab kho cov fibers me me thiab cov fillers hauv lub pulp los ntawm kev them nqi neutralization thiab bridging. Qhov no tsis tsuas yog txo qhov poob ntawm cov fibers, tab sis kuj txo qhov kev thauj khoom ntawm kev kho dej phwj tuaj.
2. Lub tshuab ntawv ntub dej kawg
Hauv lub tshuab ntawv ntub dej, kev qhuav dej sai yog qhov tseem ceeb rau kev txhim kho kev ua haujlwm zoo. Anionic lossis nonionic polyacrylamide tuaj yeem siv los ua cov lim dej pab kom yooj yim rau dej tawm ntawm cov qauv fiber los ntawm kev txhim kho cov flocculation ntawm cov fibers. Cov txheej txheem no ua rau lub sijhawm qhuav dej luv dua thaum txo cov kev siv hluav taws xob thaum lub sijhawm ziab.
3. Theem ua ntawv
Ua ib qho tshuaj dispersant, polyacrylamide tuaj yeem tiv thaiv cov fiber flocculation thiab txhim kho qhov sib npaug thiab qhov du ntawm daim ntawv. Los ntawm kev xaiv qhov hnyav molecular thiab qhov ceev ntawm PAM, cov khoom siv lub cev ntawm daim ntawv tiav, xws li lub zog tensile thiab lub zog tsim kua muag, kuj tuaj yeem ua kom zoo dua. Tsis tas li ntawd, polyacrylamide kuj tseem tuaj yeem txhim kho cov nyhuv txheej ntawm daim ntawv coated thiab ua rau kev ua haujlwm luam ntawv zoo dua.
Cov txiaj ntsig tseem ceeb ntawm polyacrylamide hauv kev txhim kho kev ua haujlwm ntau lawm
1. Txo cov khoom siv raw poob
Kev siv cov khoom pab khaws cia ua rau qhov ceev ntawm kev khaws cia ntawm cov fibers zoo thiab cov khoom sau hauv cov pulp zoo dua, txo cov khoom siv raw, thiab txuag cov nqi tsim khoom ncaj qha.
2. Ua kom cov txheej txheem qhuav sai dua
Qhov kev siv cov khoom siv lim dej ua rau cov txheej txheem dewatering ua haujlwm tau zoo dua, yog li ua rau lub tshuab ntawv ua haujlwm ceev dua thiab luv lub voj voog ntau lawm. Qhov no tsis yog tsuas yog ua rau muaj peev xwm ntau lawm ntau dua xwb, tab sis kuj txo cov kev siv hluav taws xob.
3. Txo qhov siab ntawm kev kho dej khib nyiab
Los ntawm kev txhim kho cov nyhuv flocculation, polyacrylamide tuaj yeem txo cov ntsiab lus ntawm cov khoom khib nyiab hauv cov dej khib nyiab, txo qhov kev thauj khoom ntawm cov chaw kho dej phwj tuaj ntawm qhov chaw thiab txo cov nqi tiv thaiv ib puag ncig ntawm cov lag luam.
4. Txhim kho qhov zoo ntawm daim ntawv
Kev siv cov tshuaj dispersants ua rau cov fiber faib ntawm daim ntawv sib xws ntau dua, txhim kho cov khoom siv lub cev thiab pom ntawm daim ntawv, thiab txhim kho kev sib tw ua lag luam ntawm cov khoom.
Cov yam ntxwv cuam tshuam rau kev siv cov nyhuv ntawm polyacrylamide
Yuav kom muab kev ua si tag nrho rau kev ua tau zoo ntawm polyacrylamide, cov hauv qab no yuav tsum tau tsom mus rau:
1. Kev xaiv qauv PAM
Cov txheej txheem ua ntawv sib txawv thiab hom ntawv sib txawv muaj cov kev cai sib txawv rau qhov hnyav molecular thiab qhov ceev ntawm PAM. PAM hnyav molecular siab yog qhov tsim nyog rau kev sib xyaw thiab kev pab lim dej, thaum PAM hnyav molecular qis yog qhov tsim nyog dua rau kev sib kis.
2. Ntxiv tus nqi thiab txoj kev ntxiv
Yuav tsum tswj kom meej tias qhov ntau ntawm PAM ntxiv. Qhov ntau dhau yuav ua rau muaj kev cuam tshuam tsis zoo, xws li cuam tshuam rau kev ua haujlwm ntawm lub cev qhuav dej lossis ua rau cov nqi tsim khoom nce ntxiv. Tib lub sijhawm, yuav tsum siv txoj kev ntxiv sib npaug kom tsis txhob muaj kev sib sau ua ke hauv zos uas cuam tshuam rau qhov cuam tshuam.
3. Cov xwm txheej ntawm cov txheej txheem
Kub, pH thiab dej txhua yam cuam tshuam rau kev ua haujlwm ntawm PAM. Piv txwv li, cationic PAM ua haujlwm zoo tshaj plaws hauv cov xwm txheej nruab nrab mus rau me ntsis acidic, thaum anionic PAM tsim nyog rau cov chaw alkaline.
Ua ib qho khoom siv ntau yam hauv kev lag luam ua ntawv, polyacrylamide ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntau lawm, txo cov nqi tsim khoom thiab txhim kho cov khoom zoo nrog nws cov khoom zoo heev, kev khaws cia, kev lim dej thiab kev sib kis. Hauv kev siv ua haujlwm, cov tuam txhab yuav tsum xaiv thiab ua kom zoo dua cov xwm txheej siv PAM raws li lawv tus kheej cov yam ntxwv thiab kev xav tau kom ua tiav cov txiaj ntsig zoo tshaj plaws rau kev lag luam thiab ib puag ncig.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-28-2024
