Resin pretreatment
Vim hais tias nyob rau hauv cov txheej txheem ntawm cov khoom siv hluavtaws, qhov saum npoo thiab qhov khoob ntawm cov resin yog sib xyaw nrog cov molecular uas tsis tshua muaj thiab qee cov inorganic impurities (xws li tooj liab, hlau, thiab lwm yam), cov tshuaj molecular monomer, thiab cov pore ua rau cov neeg ua haujlwm, thiab lwm yam. cov resin raug muab tso rau hauv kev ua haujlwm, cov impurities yuav tsum tau muab tshem tawm, txwv tsis pub nws yuav ua paug rau cov resin ntau txoj hauv kev thaum siv. Tshwj xeeb, nws yuav tsum tau taw qhia tias nyob rau hauv cov dej khib nyiab uas muaj chromium, vim hais tias chromic acid yog ib tug oxidizing tus neeg sawv cev, xws li tooj liab thiab hlau nyob rau hauv cov cob, nws muaj ib tug catalytic oxidation nyhuv, yog li ceev cov oxidation ntawm resin. Txoj kev pretreatment yog raws li nram no:
1. Ntxuav hauv dej kub
Cov resin tshiab yuav tsum tau muab ntxuav dua nrog dej kub. Yang resin tuaj yeem siv rau hauv dej kub ntawm 70 ~ 80 degree, Yin resin (tshwj xeeb tshaj yog muaj zog alkali Yin resin) muaj cov cua kub tsis zoo, thiab tuaj yeem siv hauv dej kub ntawm 50 ~ 60 degree. Thaum pib da dej, hloov dej txhua 15 feeb lossis li ntawd, yog tias tsis txhuam thaum ntxuav, hloov dej 4-5 zaug, koj tuaj yeem hloov dej txhua 30 feeb lossis li ntawd, tag nrho ntawm 7 mus rau 8 zaug. , tsau kom txog thaum cov dej ntxuav tsis yog xim av thiab ua npuas ncauj tsawg heev.
2. acid, alkali kho
Cov resin yog ntxuav hauv dej kub thiab muab ntim rau hauv kem thiab kho nrog acid thiab alkali. Cov resin zoo nrog 1mol / 1HCL maj mam ntws los ntawm txheej txheej, tus nqi yog li 2 mus rau 3 npaug ntawm cov khoom ntim, li 2 teev kom tiav qhov ntws, me ntsis ntxuav nrog dej, thiab tom qab ntawd nrog 1mol / 1NaOH ntws los ntawm cov resin. txheej, tus nqi thiab tus nqi ntws yog tib yam li ua ntej. Tom qab lub alkali ntws tiav lawm, cov resin yog ntxuav nrog dej kom txog thaum cov dej ph9 yog hais txog, thiab ces 1mol/1HCL los yog 0.5mol/1H2SO4 yog siv los hloov cov resin rau hauv H + hom, qhov ntau npaum yog {{ 16 }} lub sij hawm lub ntim ntawm cov resin, thiab tus nqi ntws yog tib yam li ua ntej. Tom qab cov kua qaub tiav lawm, ntxuav nrog dej kom txog thaum cov dej siab tshaj ph6, koj tuaj yeem muab tso rau hauv kev ua haujlwm.
Resin saib xyuas
Nyob rau hauv tus txheej txheem ntawm kev siv cov resin, cov pa phem ntawm cov khoom raug tshem tawm, cov organic teeb meem thiab cov roj yuav tsum tau tiv thaiv, thiab cov oxidation nruj ntawm qee cov dej khib nyiab ntawm cov resin yuav tsum tau tiv thaiv. Yog li ntawd, cov hlau hnyav ions yuav tsum tau muab tshem tawm ua ntej cov kua qaub oxidation khib nyiab nkag mus rau qhov tsis zoo los tiv thaiv cov nyhuv catalytic ntawm cov hlau hnyav ntawm cov cob. Tom qab txhua qhov kev ua haujlwm ntawm cov cuab yeej siv, cov dej khib nyiab hauv kem pauv yuav tsum tau muab pov tseg rov qab rau hauv lub tank dej khib nyiab thiab muab tso rau hauv dej kais dej lossis dej huv xwb. Cov resin yuav tsum tau regenerated nyob rau hauv lub sij hawm tom qab saturation, thiab yuav tsum tsis txhob soaked nyob rau hauv lub Tshuag tov rau lub sij hawm ntev tom qab regeneration, thiab yuav tsum tau ntxuav nyob rau hauv lub sij hawm.
Resin activation
Txawm hais tias nws yog cov khoom zoo lossis cov khoom tsis zoo, thaum siv rau ntau lub voj voog, qhov sib pauv peev xwm yuav txo qis. Ntawm qhov tod tes, vim kev tsim tsis tiav, qee qhov nyiaj ntawm cov ions tsis tsim nyog ntawm cov resin maj mam sib sau ua ke, cuam tshuam rau kev sib pauv ib txwm; Ntawm qhov tod tes, piv txwv li, H2CrO4 thiab H2Cr2O7 hauv cov dej khib nyiab uas muaj chromium muaj cov teebmeem oxidation ntawm cov resin, kom ntau thiab ntau Cr3+ hauv cov resin cuam tshuam rau kev ua haujlwm ntawm cov resin. Yog li ntawd, thaum lub peev xwm resin muaj ib qho kev poob qis, kev ua kom cov resin yuav tsum tau ua.
1. kev ua kom cov anion ion txauv resin
Kev ntsuas ua kom tsis zoo ntawm cov khoom siv tsis zoo yuav tsum sib txawv raws li cov dej khib nyiab tau kho. Muaj qee qhov kev ua tiav ntawm kev ua haujlwm tsis zoo hauv kev kho cov dej khib nyiab uas muaj chromium hauv Suav teb. Lub hauv paus ntsiab lus ntawm kev ua haujlwm yog raws li hauv qab no: Tom qab ib txwm rov tsim dua tshiab ntawm Yin resin, soak hauv 2-2.5mol //1H2SO4 tov, thiab tom qab ntawd ntxiv NaHSO3 nyob rau hauv qeeb stirring kom txo tau Cr6+ ntawm cov resin rau Cr{ {7}}. Cov resin yog tsau rau hauv cov tshuaj saum toj no rau ib hnub thiab hmo ntuj, thiab tom qab ntawd ntxuav nrog dej huv. Cov txheej txheem saum toj no rov ua dua rau 1-2 lo lus, thiab Cr6+ thiab Cr3+ hauv cov resin tuaj yeem raug tshem tawm, thiab tom qab ntawd hloov nrog NaOH siv.
2. Ua kom muaj cation ion exchange resin
Lub hom phiaj tseem ceeb ntawm kev ua kom muaj txiaj ntsig zoo yog tshem tawm cov hlau hnyav ions uas muaj nyob rau ntawm cov cob, tshwj xeeb tshaj yog cov vaant cations uas muaj zog binding quab yuam nrog cov resin, xws li Fe{{0}}, Cr3+ , thiab lwm yam. Nws tuaj yeem qhib tau rau hauv lub cev, tus nqi ntawm cov kua ua kua yog 2 npaug ntawm cov khoom ntim, thiab cov txheej txheem hydrochloric acid nrog rau qhov concentration ntawm 3. txheej ntawm cov txheej txheem rov tsim dua tshiab, thiab tom qab ntawd cov resin yog tsau rau hauv sulfuric acid tov nrog 1 ~ 2 zaug ntawm cov khoom ntim thiab cov concentration ntawm 2.0 ~ 2.5mol / 1 rau ib hnub thiab hmo ntuj (tsawg kawg 8 teev). Cr3+ thiab lwm yam hnyav hlau ions raug tshem tawm, thiab cov resin tuaj yeem siv tom qab ntxuav.
