Cov txheej txheem tseem ceeb rau kev txiav txim siab seb magnesium oxide tau ua tiav zoo li cas yog seb cov ntsiab lus ntawm magnesium oxide tau rov qab los rau ntau dua lossis sib npaug li 60%, cov dej noo tsawg dua lossis sib npaug li 1.5%, thiab lub cev lub cev yog cov hmoov dawb xoob. Qhov no tuaj yeem txheeb xyuas tau los ntawm kev sib xyaw tshuaj lom neeg nrog kev soj ntsuam lub cev.
1. Kev Tshawb Nrhiav Tshuaj (Qhov tseeb tshaj plaws)
(1) Hydration Method (Cov Qauv Pom Zoo: HG/T 3928-2012)
Lub hauv paus ntsiab lus: Active magnesium oxide reacts nrog dej los tsim magnesium hydroxide. Cov ntsiab lus nquag yog xam los ntawm kev ntsuas qhov nce hauv huab hwm coj.
Kev ua haujlwm yooj yim: hnyav 100g ntawm cov qauv thiab ntxiv 400g dej huv thiab do.
Ua ntej- ziab hauv qhov cub 110℃rau 2 teev, tom qab ntawd nce qhov kub thiab txias mus rau 150℃thiab qhuav kom qhov hnyav tas li.
Txoj kev no yog siv dav hauv kev lag luam, cov txiaj ntsig tau txhim khu kev qha, thiab nws yog qhov tsim nyog rau kev lees txais kev lag luam.
(2) Citric Acid Method lossis Iodine Adsorption Method
Tsim nyog rau kev soj ntsuam sai, tsis ncaj qha cuam tshuam kev ua haujlwm los ntawm cov tshuaj tiv thaiv tus nqi.
Yuav tsum tau titration nrog cov qauv kev daws teeb meem, kev ua haujlwm yog qhov nyuaj dua, tab sis kev sib piv ntau yog ua tau.
2. Kev Txiav Txim Lub Cev thiab Kev Pom Zoo (Txoj Kev Pabcuam)
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Kev txiav txim Indicators |
Cov cim ntawm kev ua kom tiav |
Kev piav qhia |
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Xim |
Dawb los yog tawm -dawb hmoov |
Greyish los yog tsaus xim qhia tau hais tias tsis tiav decomposition los yog theem nrab noo noo nqus |
|
Qhov tshwm sim |
Loose, tsis muaj pob |
Tseem clumpy qhia tias lub cev qhuav dej tsis txaus |
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Flowability |
Smooth pouring, tsis muaj nplaum |
Tsis zoo flowability qhia tias seem ya raws los yog sintering |
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Xav |
Qhuav, du, tsis yog - nplaum |
Dampness qhia tias nqus dej noo thaum lub caij txias los yog ntim khoom |
Qhov tshwm sim ib leeg tsis tuaj yeem muab kev txiav txim meej; nws tsuas tuaj yeem ua haujlwm raws li kev tshuaj xyuas ua ntej.
3. Laboratory validation cov lus pom zoo
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Cov khoom kuaj |
Kev vam meej |
Txoj kev pom zoo |
|
Active Magnesium Oxide Cov ntsiab lus |
Ntau dua lossis sib npaug li 60% |
Hydration Method (HG/T 3928-2012) |
|
Cov ntsiab lus noo noo |
Tsawg dua lossis sib npaug li 1.5% |
Poob ntawm Txoj Kev Qhuav lossis Karl Fischer Method |
|
Qhov chaw tshwj xeeb |
Nce ntxiv |
BET Method (Highly active MgO is typically >30 m²/g) |
Rau cov ntawv thov hauv thaj chaw tseem ceeb xws li roj hmab thiab hluav taws xob, nws raug nquahu kom xa cov qauv mus rau CNAS- qhov chaw kuaj pom zoo rau daim ntawv pov thawj.
