xov xwm

Lub ntsiab tseem ceeb ntawm diatomite raws li cov cab kuj yog SiO2. Piv txwv li, lub active tivthaiv ntawm industrial vanadium catalyst yog V2O5, lub cocatalyst yog alkali hlau sulfate, thiab cov cab kuj yog refined diatomite. Cov txiaj ntsig tau pom tias SiO2 muaj kev ruaj khov ntawm cov khoom siv, thiab nws nce nrog qhov nce ntawm K2O lossis Na2O cov ntsiab lus. Cov kev ua ntawm cov catalyst kuj muaj feem xyuam rau cov dispersion ntawm kev txhawb nqa thiab pore qauv. Tom qab kho diatomite nrog cov kua qaub, oxide impurity cov ntsiab lus txo, SiO2 cov ntsiab lus nce, cov cheeb tsam tshwj xeeb thiab qhov pore ntim kuj nce, yog li cov cab kuj ntawm refined diatomite zoo dua li ntawm ntuj diatomite.

Diatomite feem ntau yog tsim los ntawm cov seem ntawm silicates tom qab kev tuag ntawm ib leeg-celled algae, sib sau ua ke hu ua diatoms, thiab yog qhov tseem ceeb hydrated amorphous SiO2. Diatoms tuaj yeem nyob hauv dej tshiab thiab ntsev. Muaj ntau ntau hom diatoms, uas feem ntau tuaj yeem muab faib ua "ntev siab" diatoms thiab "feather striata" diatoms. Hauv txhua qhov kev txiav txim, muaj ntau "genera", uas yog qhov nyuaj heev.

Lub ntsiab tseem ceeb ntawm ntuj diatomite yog SiO2. Qhov zoo tshaj plaws diatomite yog dawb, thiab SiO2 cov ntsiab lus feem ntau tshaj 70%. Ib qho diatoms tsis muaj xim thiab pob tshab, thiab cov xim ntawm diatomite nyob ntawm cov av nplaum thiab cov organic teeb meem, thiab lwm yam, thiab cov diatoms los ntawm cov ntxhia sib txawv yog txawv.

Diatomite yog fossil diatomite deposit tsim tom qab lub sij hawm tsub zuj zuj ntawm li 10,000 mus rau 20,000 xyoo tom qab kev tuag ntawm ib leeg-celled nroj tsuag hu ua diatoms. Diatoms yog thawj cov protozoa tshwm sim hauv ntiaj teb, nyob hauv dej hiav txwv thiab pas dej. Nws yog no diatom, uas muab oxygen rau lub ntiaj teb los ntawm photosynthesis, uas yog lub luag hauj lwm rau kev yug los ntawm tib neeg thiab tsiaj txhu thiab nroj tsuag.

Hom diatomite no yog tsim los ntawm kev tso tawm ntawm cov seem ntawm ib leeg-celled dej cog diatomite. Cov cuab yeej tshwj xeeb ntawm diatomite yog tias nws tuaj yeem nqus cov silicon dawb hauv dej los tsim nws cov pob txha. Thaum nws lub neej dhau lawm, nws tuaj yeem tso nyiaj thiab tsim cov diatomite tso rau hauv qee qhov xwm txheej geological. Nws muaj qee yam khoom tshwj xeeb, xws li porosity, tsis tshua muaj siab, qhov loj dua qhov chaw thaj chaw, txheeb ze incompressibility thiab tshuaj lom neeg ruaj khov, mus txog rau thawj cov av crushing, sorting, calcination, xws li huab cua khiav kev faib tawm, mus rau txoj kev ua haujlwm nyuaj los hloov nws cov particle loj tis thiab nto khoom, yog haum rau txheej xim additives, thiab lwm yam yuav tsum tau muaj.