FLOCCULATION
Nyob rau hauv lub teb ntawm chemistry, flocculation yog txheej txheem uas cov colloidal hais tawm los ntawm ib tug precipitate nyob rau hauv flocculent los yog flake daim ntawv los ntawm ib tug ncua kev kawm ntawv los yog los ntawm kev ntxiv ntawm ib tug clarifier.Cov txheej txheem no txawv los ntawm nag lossis daus nyob rau hauv uas cov colloid tsuas yog raug tshem tawm hauv cov kua raws li qhov ruaj khov dispersion ua ntej flocculation thiab tsis tau yaj hauv cov tshuaj.
Coagulation thiab flocculation yog cov txheej txheem tseem ceeb hauv kev kho dej.Qhov kev ua ntawm coagulation yog ua kom tsis muaj zog thiab sib sau ua ke los ntawm kev sib cuam tshuam ntawm cov coagulant thiab colloid, thiab flocculate thiab precipitate cov khoom tsis ruaj khov los ntawm coagulating lawv mus rau hauv flocculation.
TERM DEFINITION
Raws li IUPAC, flocculation yog "tus txheej txheem ntawm kev sib cuag thiab adhesion uas yog qhov sib txawv ntawm qhov sib txawv ntawm cov pawg loj dua".
Yeej, flocculation yog tus txheej txheem ntawm kev ntxiv ib qho flocculant kom destabilize cov nqi them ruaj khov.Nyob rau tib lub sijhawm, flocculation yog cov txheej txheem sib xyaw uas txhawb nqa agglomeration thiab pab txhawb kev sib haum xeeb.Cov coagulant feem ntau yog Al2 (SO4) 3• 14H2O.
Daim ntawv thov teb
KEV KAWM TXOJ CAI TSHIAB
Flocculation thiab nag lossis daus yog dav siv hauv kev ua kom huv ntawm cov dej haus thiab hauv kev kho cov dej phwj tuaj, dej nag thiab dej khib nyiab.Cov txheej txheem kev kho mob xws li gratings, coagulation, flocculation, nag lossis daus, particle filtration thiab tshuaj tua kab mob.
SURFACE CHEMIStry
Hauv colloidal chemistry, flocculation yog txheej txheem uas cov khoom zoo sib xyaw ua ke.Lub floc yuav ntab mus rau saum cov kua (opalescent), nyob rau hauv qab ntawm cov kua (precipitate) los yog yooj yim lim tawm ntawm cov kua.Tus cwj pwm flocculation ntawm cov av colloid yog ze ze rau cov dej tsis zoo.Lub siab dispersion ntawm cov av colloid tsis tsuas yog ncaj qha ua rau turbidity ntawm ib puag ncig dej, tab sis kuj ua rau eutrophication vim nqus cov as-ham hauv cov dej ntws, pas dej thiab txawm submarine hull.
PHYSICAL CHEMISTRY
Rau emulsions, flocculation piav qhia txog kev sib sau ua ke ntawm ib qho kev sib cais kom cov tee dej tsis poob lawv cov khoom.Yog li, flocculation yog thawj kauj ruam (tej dej coalescence thiab theem kawg sib cais) uas ua rau kev laus ntxiv ntawm emulsion.Flocculants yog siv nyob rau hauv mineral beneficiation, tab sis kuj yuav siv tau nyob rau hauv lub tsim ntawm lub cev khoom ntawm zaub mov thiab tshuaj.
DEFLOCCULATE
Rov qab flocculation yog qhov txawv ntawm flocculation thiab qee zaum hu ua gelling.Sodium silicate (Na2SiO3) yog ib qho piv txwv.Colloidal hais feem ntau yog dispersed ntawm ntau dua pH, tshwj tsis yog rau qhov tsawg ionic zog ntawm cov tshuaj thiab cov dominance ntawm monovalent hlau cations.Cov tshuaj ntxiv uas tiv thaiv colloid los ntawm kev tsim flocculent yog hu ua antiflocculants.Rau thim rov qab flocculation los ntawm electrostatic teeb meem, cov nyhuv ntawm qhov rov qab flocculant tuaj yeem ntsuas los ntawm zeta peev xwm.Raws li phau ntawv Encyclopedia Dictionary of Polymers, antiflocculation yog "lub xeev lossis lub xeev ntawm kev tawg ntawm cov khoom hauv cov kua uas txhua qhov khoom tseem nyob ywj pheej thiab tsis txuas nrog nws cov neeg nyob ze (ntau zoo li emulsifier).Non-flocculating suspensions muaj pes tsawg los yog tsawg heev yield value ".
Rov qab flocculation tuaj yeem ua teeb meem hauv cov chaw kho dej phwj tuaj vim nws feem ntau ua rau sludge daws teeb meem thiab ua rau cov dej tsis zoo.
Post lub sij hawm: Mar-03-2023