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| Titel: |
CHLORINATION KINETICS OF Nb2O5 |
| Auteur: |
FRElTAS†, L. Ajersch†, F. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 30 (1984) nr. 1-2 pagina's 19-33 |
| Jaar: |
1984-09-01 |
| Inhoud: |
The reaction of single sintered pellets of α-Nb2O5 with chlorine and carbon monoxide was studied in the temperature range from 773 K to 1073 K using a thermogravimetric apparatus. The rate controlling step of the reaction was determined from experiments carried out at variable gas flow rates, gas composition, surface geometry, pellet porosity and temperature. The vapor phase transport reaction can be written as: Nb2O5(s) + 3Cl2 (g) + 3CO(g) = 2NbOCl3 (g) + 3CO2(g). Up to 60% conversion, the amount of volatilized product was found to be directly proportional to the time of reaction. The external surface area of the pellets remains unchanged up to this stage while the intergranular morphology changes. These results were compared with reaction rates of commercial pyrochlore concentrate in order to establish the fundamental reaction stages of the process of extraction of Nb2O5 from pyrochlore. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 10 gevonden artikelen
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