Silica gel yog ib yam khoom siv adsorption zoo heev.
Nws yog ib qho tshuaj amorphous thiab nws cov tshuaj formula yog mSiO2.nH2O. Nws ua tau raws li Suav tshuaj tus qauv HG / T2765-2005. Nws yog cov khoom siv desiccant tau pom zoo los ntawm FDA uas tuaj yeem tiv tauj ncaj qha nrog zaub mov thiab tshuaj. Silica gel muaj zog hygroscopic muaj peev xwm, muaj zog adsorption kev ua tau zoo, txawm tias silica gel desiccant yog tag nrho rau hauv dej, nws yuav tsis soften lossis liquify. Nws muaj cov yam ntxwv ntawm tsis muaj tshuaj lom, tsis qab, tsis muaj corrosive thiab tsis muaj kuab paug, yog li nws tuaj yeem tiv tauj ncaj qha nrog txhua yam khoom. Cov khoom siv raw uas yuav tsum tau npaj rau kev tsim cov silica gel yog: sodium silicate (paucine, dej iav), sulfuric acid.
Ua ntej, cov alkali thiab acid tau npaj ua ntej, thiab tom qab ntawd cov khoom sodium silicate yog yaj ntawm qhov kub thiab txias thiab lim los npaj cov kua qaub, thiab tom qab ntawd cov sulfuric acid tau npaj rau qee qhov concentration ntawm cov kua, qhov concentration ntawm sulfuric acid. acid yog 20%.
Qhov thib ob, cov kauj ruam thib ob yog ua cov kua nplaum (gel granulation), cov kauj ruam no yog qhov tseem ceeb tshaj plaws, cov txheej txheem ua ntej ua npuas lye thiab sulfuric acid tov nyob rau hauv cov xwm txheej tshwj xeeb, thiaj li tsim tau cov kua gel soluble, tom qab ncav cuag qhov tsim nyog concentration. ua gel hais. Cov duab thiab qhov loj ntawm cov khoom tuaj yeem txiav txim siab tag nrho raws li tus neeg siv xav tau thiab muaj peev xwm ntau lawm. Cov txheej txheem ntawm gel granulation yog huab cua granulation, thiab cov kua qaub-puag piv, concentration, kub thiab gel granulation lub sij hawm siv nyob rau hauv cov txheej txheem gel granulation yog cov txheej txheem tshwj xeeb.
Qhov thib peb, cov laus gel yuav tsum tau mus txog qee lub sijhawm thiab qhov kub thiab txias, nrog rau PH tus nqi rau lub hnub nyoog, ua rau lub cev pob txha muaj zog, cov kua nplaum sib xyaw ntawm cov khoom thaum lub sij hawm kev laus los tsim Si-O-Si bonds, txhim kho lub zog ntawm cov pob txha pob txha, cov khoom nyob ze ntawm ib leeg, txo qhov chaw hauv cov kab sib chaws, thiab cov dej uas muaj nyob hauv nws yog nyem tawm.
Pickling, ntxuav, ntxuav kua nplaum Pickling, ntxuav, ntxuav kua nplaum kuj yog ib qho tseem ceeb heev hauv cov txheej txheem, vim hais tias cov Na2SO4 tsim los ntawm granular gel yog ntxuav tawm. Tswj txhua tus anion nyob rau hauv qhov ntau xav tau los ntawm cov txheej txheem. Nws tuaj yeem hais tau tias feem ntau ntawm cov yam ntxwv ntawm qhov pore ntawm cov silica gel tiav yog txiav txim siab los ntawm kev laus ntawm cov txheej txheem ntxuav cov roj hmab, thiab cov txheej txheem kev laus ntawm cov txheej txheem no nyob ntawm kev ua haujlwm hauv kev ntxuav, ntxuav, thiab roj hmab.
Thib tsib, ziab, npaj hydrogel (tom qab ntxuav) mus rau hauv chav tsev kom qhuav, nyob rau hauv tej yam kev mob los txo cov dej ntsiab lus ntawm cov gel nws tus kheej kom qhuav mus rau qhov yuav tsum tau ntau yam. Qhov siab dua qhov ziab kom qhuav, qhov siab dua tus nqi ntawm thawj particle aggregation thiab qhov loj dua qhov aperture.
Rau, kev tshuaj ntsuam xyuas, lub tshuab xaiv lub pob yuav qhuav tom qab lub silicone los ntawm kev tshuaj ntsuam ntawm qhov sib txawv apertures raws li ib qho me me ntawm qhov ntsuas tawm, thiab tib lub sijhawm yuav tawg silica gel tshuaj ntsuam tawm.
Xya, xaiv cov kua nplaum: cov silica gel nyob rau hauv lub pob heterochromatic, impurities tshem tawm thiab tom qab ntawd siv cov ntawv sib xyaw raws li qhov xav tau ntawm lub ntim, tom qab sib khi. Tom qab cov kauj ruam saum toj no, cov khoom siv silicone yog tsim.
Post lub sij hawm: Nov-14-2023
