Silica gel yog ib hom khoom siv adsorption uas muaj zog heev.
Nws yog ib yam khoom tsis muaj zog thiab nws cov mis tshuaj yog mSiO2.nH2O. Nws ua tau raws li tus qauv tshuaj suav HG/T2765-2005. Nws yog ib yam khoom siv desiccant uas tau pom zoo los ntawm FDA uas tuaj yeem sib cuag ncaj qha nrog cov khoom noj thiab tshuaj. Silica gel muaj peev xwm hygroscopic muaj zog, kev ua haujlwm nqus tau zoo, txawm tias cov silica gel desiccant raug muab tso rau hauv dej tag nrho, nws yuav tsis mos lossis ua kua. Nws muaj cov yam ntxwv ntawm tsis muaj tshuaj lom, tsis muaj saj, tsis xeb thiab tsis ua rau muaj kuab paug, yog li nws tuaj yeem sib cuag ncaj qha nrog txhua yam khoom. Cov ntaub ntawv 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 cov kua qaub tau npaj ua ntej, thiab tom qab ntawd cov khoom siv sodium silicate tau yaj ntawm qhov kub siab thiab lim kom npaj tau qee qhov concentration ntawm cov kua, thiab tom qab ntawd cov kua qaub sulfuric tau npaj rau qee qhov concentration ntawm cov kua, qhov concentration ntawm sulfuric acid yog 20%.
Qhov thib ob, kauj ruam thib ob yog ua kua nplaum (gel granulation), kauj ruam no yog qhov tseem ceeb tshaj plaws, cov kua nplaum ua ntej thiab cov kua sulfuric acid nyob rau hauv cov xwm txheej tshwj xeeb, yog li tsim cov kua nplaum gel, tom qab ncav cuag qhov concentration tsim nyog yuav dhau los ua cov khoom me me gel. Cov duab thiab qhov loj ntawm cov khoom me me tuaj yeem txiav txim siab tag nrho raws li tus neeg siv xav tau thiab muaj peev xwm tsim khoom. Txoj kev siv ntau ntawm gel granulation yog cua granulation, thiab qhov sib piv ntawm acid-base, concentration, kub thiab gel granulation siv hauv cov txheej txheem gel granulation yog cov txheej txheem tshwj xeeb.
Qhov thib peb, cov gel laus yuav tsum tau siv sijhawm thiab kub, nrog rau tus nqi PH rau hnub nyoog, ua rau cov pob txha gel muaj zog, cov kua nplaum sib xyaw ntawm cov khoom me me thaum lub sijhawm laus los tsim Si-O-Si daim ntawv cog lus, txhim kho lub zog ntawm cov pob txha, cov khoom me me nyob ze rau ib leeg, txo qhov chaw hauv cov qauv grid, thiab cov dej uas muaj nyob hauv nws raug zawm tawm.
Kev ntxuav, ntxuav, ntxuav kua nplaum Kev ntxuav, ntxuav, ntxuav kua nplaum kuj yog ib kauj ruam tseem ceeb heev hauv cov txheej txheem, vim tias Na2SO4 tsim los ntawm cov gel granular raug ntxuav tawm. Tswj txhua anion hauv qhov ntau uas xav tau los ntawm cov txheej txheem. Nws tuaj yeem hais tias ib feem loj ntawm cov yam ntxwv ntawm cov silica gel tiav lawm yog txiav txim siab los ntawm kev laus ntawm cov txheej txheem ntxuav roj hmab, thiab qib kev laus ntawm cov txheej txheem no nyob ntawm kev ua haujlwm hauv cov txheej txheem pickling, ntxuav, thiab ntxuav roj hmab.
Qhov thib tsib, ziab, cov hydrogel uas tau npaj tseg (tom qab ntxuav) mus rau hauv chav ziab, hauv cov xwm txheej tshwj xeeb kom txo cov dej ntawm cov gel nws tus kheej kom qhuav mus rau qhov ntau yam uas xav tau. Qhov kub ziab siab dua, qhov nrawm ntawm cov khoom me me sib sau ua ke thiab qhov loj dua qhov aperture.
Rau, kev tshuaj ntsuam, lub tshuab xaiv pob yuav raug ziab tom qab cov silicone los ntawm kev tshuaj ntsuam ntawm ntau qhov sib txawv raws li qee qhov loj me ntawm cov khoom me me, thiab tib lub sijhawm yuav raug rhuav tshem silica gel tshuaj ntsuam tawm.
Xya, xaiv cov kua nplaum: cov silica gel nyob rau hauv lub pob heterochromatic, xaiv cov impurities tawm, thiab tom qab ntawd siv cov ntawv sib xyaw raws li qhov yuav tsum tau ua ntawm lub ntim, tom qab kaw. Tom qab cov kauj ruam saum toj no, cov khoom silicone raug tsim.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-14-2023
