nkhani

Monga zinthu zazikulu za matope a diatom, dziko lapansi la diatomaceous makamaka limagwiritsa ntchito mawonekedwe ake a microporous kuti abweretse mphamvu ya adsorption ya mpweya wa macromolecular monga benzene, formaldehyde, ndi zina zotero. Pakadali pano, njira zomwe zimagwiritsidwa ntchito kwambiri pokonza diatomite pamsika makamaka zikuphatikiza kuwotcha ndi kuwerengetsa. Zofunika zowotcha ndizokwera, liwiro limachedwa, kutulutsa kumakhala kochepa, ndipo mtengo wake ndi wokwera, pamene zofunikira za calcination ndizochepa, liwiro liri mofulumira, ndipo mtengo wake ndi wotsika mwachibadwa.

1. Chotchedwa Kuwotcha amatanthauza mosamalitsa kulamulira kutentha pafupifupi 500 madigiri Celsius, pang'onopang'ono kukweza kutentha kwa dziko lapansi diatomaceous, ndi Kuwotcha pa liwiro mosalekeza kwa maola oposa 2, amene angathe kusunga ambiri a pore umphumphu ndi kutengeka wabwino wa dziko diatomaceous, ndipo ndi pang'onopang'onokwathunthu, ndi woyera ndi mkulu ndi particles ndi yunifolomu.

2. Calcining imatanthawuza kuwonjezera dziko la diatomaceous ku co-solvent ndikuwotcha mu ng'anjo pa kutentha kwakukulu kwa 900 mpaka 1150 madigiri kwa mphindi 10 mpaka 30 mphindi. Co-solvent imasungunuka mwachangu ndikulumikizana ndi dziko la diatomaceous. Calcining ikhoza kuchitidwa ndi nthawi yochepa komanso yotsika mtengo. Komabe, chifukwa kutentha ndi kwakukulu kwambiri komanso kovuta kulamulira, n'zosavuta kuti sinter ndi pellet diatomite, amene ayenera pansi ndi kusweka kuti fineness chofunika, kuwononga yachiwiri pores pamwamba pa diatomite. Pamene cosolvent imasungunuka ndikumamatira pamwamba pa dziko lapansi la diatomaceous, ma pores a dziko lapansi la diatomaceous amatsekedwa, ndipo malo enieni a dziko lapansi a diatomaceous amachepetsedwa. Kuphatikiza apo, kutentha kwambiri mpaka 1100 kumasungunuka mosavuta ndikusokonekera kwa ma micropores a dziko lapansi la diatomaceous, mawonekedwe a micropore a thupi la diatomaceous amawonongeka, makoma ena a pore amasungunuka ndikusungunuka, ndipo mawonekedwe amitundu yambiri a dziko la diatomaceous amalowa, zomwe zimapangitsa kuti pakhale kuchepetsedwa.

Kuyesera kwa matope a diatom kunasonyeza kuti 100g ya dziko lapansi la diatomaceous calcined pa madigiri 500 Celsius kwa maola 2 ndi 5% co-solvent inawonjezeredwa, ndiyeno pamwamba pa 900 ° ndi 1100 °, motero, ndipo pamwamba pake adawonedwa pansi pa microscope ya electron.

Pambuyo pa calcination pa 500 °, pamwamba pa dziko lapansi la diatomaceous ndi lokwanira kwambiri, ndipo pores alibe zizindikiro za kugwa kapena kuphatikizika, kusonyeza kuti ali ndi adsorption yapamwamba. Pambuyo powerengeredwa pa 900 ℃, nthaka ya diatomaceous idavumbulutsa diski yozungulira ya siliceous, ndipo m'mphepete mwake munasungunuka. Ma micropores mu thupi lozungulira la sieve adatsekedwa chifukwa cha kusungunuka kwapang'onopang'ono, ndipo gawo la thupi loyambirira la sieve linathyoledwa kukhala zidutswa.

Pambuyo pa kuwerengera pa 1150 ℃, ma micropores omwe anali pamwamba pa dziko lapansi la diatomaceous adasungunuka ndikuzimiririka, mawonekedwe a micropore a thupi la diatomaceous adawonongedwa kwathunthu, ndipo kutsatsa kudatayika kwathunthu.

Zitha kuwoneka kuti ngakhale njira zosiyanasiyana zogwirira ntchito za dziko la diatomaceous kuchokera kumalo opangira omwewo zingayambitse kusiyana kwakukulu mu mphamvu ya adsorption ya dziko la diatomaceous. Choncho, Dr.