Txheej txheem cej luam ntawm silev indiffing
Silica tebchaw yog lub zog loj nyob rau hauv dej ntuj, feem ntau yaj nyob rau hauv dej thaum muaj cov pob zeb muaj silicates thiab aluminosilicates. Cov av hauv av feem ntau muaj ntau dua li cov dej sib txuas ntau dua li cov dej saum npoo av, nrog Sio2 cov ntsiab lus hauv cov txiaj ntsig kev tso pa<50 mg/L.
Hauv kev siv cov dej khib nyiab rov siv hluav taws xob (tshwj xeeb yog cov tshuaj siv hluav taws xob rov qab siv dua tshiab rau hauv cov tawv nqaij osmosis yooj yim yooj yim yooj yim
Nyob rau hauv tam sim no nrov xoom - Kev Tshis Cov Teeb Meem yog ib qho nyuaj tshaj plaws los daws qhov teeb meem thaum tshem tawm Sio2.
Mechanism ntawm silish Scaling
Cov duab ro yog rhiab rau Sio2 cov ntsiab lus vim tias, hauv lub xeev noo, SOO ntawm insoluble collica, kev tso nyiaj rau ntawm daim nyias nyias thiab ua pov thawj nyuaj kom huv. Qhov kev tso cai pom zoo ntawm Sio2 hauv seem ntawm Ro (Recacculating huab cua) nyob ntawm cov khoom sio2 thiab muaj cuam tshuam ntau heev los ntawm dej kub thiab ph.
Cov solubility ntawm Sio2 yog ncaj qha rau dej rau dej kub; Piv txwv li, cov solubility yog 100 mg / l ntawm 25℃thiab 160 mg / u ntawm 40 degree.
Kev sib txheeb ntawm Sio2 Solubility thiab PH:
Nyob rau ntawm pH 7-8, Sio2 tshwm sim raws li yaj ua silicic acid, nrog H2SIO3 thiab HSIO3- nthuav tawm hauv cov dej. Ntawm qis dua pH, nws tshwm sim raws li cov kua qaub dawb los yog nyob rau hauv ib lub xeev colloidal ntawm calcium magnesium silicate. Nyob rau hauv ntau dua pH, yog calcium thiab magnesium thiab magnesium thiab magnesium thiab muaj nyob rau hauv cov dej colloidal ntawm calcium magnesium silicate.
Cov yam ntxwv thiab kev phom sij ntawm cov cim indevic
Calcium carbonate muaj mohs hardness (pob zeb diamond yog 10) ntawm 3, cals tawv muaj cov ntsiab lus dej muaj feem xyuam rau cov dej, xws li 4.5. Silicate nplai yog qhov nyuaj tshaj plaws ntawm txhua hom nplai.
Thaum silicate Scaling tshwm sim hauv qhov kev zam Osmosis, tus nqi Flowne yuav poob sai sai, thiab qhov kev cia siab yuav poob txawm tias tom qab ntxuav tshuaj.
Kev ntsuas kev cuam tshuam loj tuaj yeem ua rau muaj kev nce siab sai sai, thiab tej zaum tseem yuav ua rau cov nplaim dej tawm ntawm lub vijtsam zoo.
Kev soj ntsuam me me ntawm cov mem tes ntawm cov membranes tshwj xeeb ntawm daim nyias nyias muaj teeb meem, qhia txog lub cev tsis muaj sia.
Yuav tsum muaj rau Sio2 thiab lwm yam ion ntau hauv cov dej pub mis
Lub sife2 concentration hauv Rov Qab Osmosis pub dej yog txiav txim siab raws cov kev tshaj lij ntawm cov solubility ntawm sab thiab feem ntau 20 pm. Yam yuavtsum tau kawm uantej: Oxygen (ua) <0.05 mg / u, thiab Aluminium ions muaj qhov cuam tshuam tseem ceeb rau cov tawv nqaij sitering.
Tus Hlau Hlau, Txhuas, thiab lwm yam, rau ntawm cov tawv nqaij sitering
Silica scaling feem ntau tshwm sim vim muaj cov txhuas lossis hlau nyob hauv dej. Hlau thiab txhuas hnov nrog silicon kom tsim insoluble hlau silicates (txhuas silicate thiab hlau silicate). Cov hlau no silicates hloov cov solubility ntawm Sio2, ntxiv nrawm nrawm membrane fouling.
Txawm tias nyob ntawm qis silicon ntau (10 ppm), aluminium motural ntawm 50 ppb tuaj yeem txwv kev ua haujlwm system.
Yog tias silicon yog tam sim no, ua kom cov dej yog pub dawb ntawm txhuas lossis hlau, thiab siv 1 μm kev ruaj ntseg lim cartridge, nrog rau kev tiv thaiv cov kua qaub.
Kev ntxuav cov khoom silicate
Cov tshuaj lom neeg tu tau yog qhov tsis muaj txiaj ntsig ntau tsis muaj kev tiv thaiv silicate nplai, thaum hydrofluoric acid yog qhov ua tau zoo heev. Txawm nyob ntawm tsawg kub thiab ntau lub zog, hydrofluoric acid nthuav tawm cov hwj huam zoo rau silicate nplai.
Tshuaj lom neeg tu tau tuaj yeem ua tau siv cov sib xyaw ntawm 0.1% hf thiab 0.4% hcL, lossis 0.1% Naf thiab 0.4% HCL.
Nco tseg:
(1) Cov concentration ntawm kev ntxuav cov kev ntxuav yuav tsum tau hloov kho raws li qhov tseeb℃ntawm fouling. Nws raug nquahu kom ua kev sim kom txiav txim siab kom txiav txim siab txog qhov tsim nyog.
(2) Hydrofluoric acid yog cov corrosive heev. Kev nqus tau ntawm nws cov vapors lossis kev sib che tawv nqaij tuaj yeem ua rau kub nyhiab uas nyuaj rau nws. Nws yog kwv yees tias kev noj ntawm 1.5g ntawm hydrofluoric acid tuaj yeem ua rau tuag tam sim ntawd. Kev nqus tau ntawm high selferrations ntawm hydrofluoric acid man tuaj yeem ua rau mob ntsws man tuaj yeem ua rau mob ntsws thiab hemorrhagic pulmonary edema. Nws kuj tseem tuaj yeem nqus tau ntawm daim tawv nqaij, ua rau cov nqaij muaj kev lom zem. Yog li, kev tiv thaiv kev tiv thaiv yuav tsum tau coj thaum ntxuav tshuaj ntxuav tshuaj, thiab kev ua haujlwm yuav tsum ua los ntawm cov neeg ua haujlwm tsim nyog.
Kev tiv thaiv ntawm cov tawv ncauj
(1) tswj cov sife2 concentration hauv cov dej pub mis thiab rov qab ua kom muaj qhov yooj yim ntawm cov khoom siv solubility rov qab yog lub hom phiaj tseem ceeb los tiv thaiv Sio2 Scaling;
(2) npaj ua cov txheej txheem ua kom zoo dua qub, xws li cov txiv qaub ua kom zoo nkauj, tuaj yeem txo cov hmoov av los ntawm cov txiv qaub.
(3) tsim nyog nce cov dej kub (tab sis tsis tshaj qhov txwv tsis pub tshaj). (4) Kev tsim kho kom nce qib vib kev cuam tshuam pab kom nce cov solubility ntawm sio2 thiab qeeb li cov tawv nqaij tawv;
(5) Ntxiv cov inhibitor tshwj xeeb tshwj xeeb rau silica scaling thaum pretreatment. Qhov siab tshaj plaws tso cai siio2 concentration ntawm lub ntsej muag zoo sib txawv nyob ntawm cov nplai inhibitor. Thov sab laj cov nplai tso inhibitor cov chaw tsim khoom kom paub meej;
(6) colloidal silica tuaj yeem muab tshem tawm los ntawm kev kos duab nrog cov txheej txheem sib hloov pauv lossis siv ultrafiltration memcrane nrog lub cev hnyav txiav kom tsawg dua 10,000.