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| Titel: |
EFFECT OF AGING ON PARTICLE SIZE AND OXIDATION RATE IN THE FORMATION OF NEEDLE-LIKE GOETHITE PARTICLES BY AIR OXIDATION OF AQUEOUS FERROUS HYDROXIDE SUSPENSION |
| Auteur: |
Kumazawa, H. Kawasaki, H. Ikeda, N. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 179 (2000) nr. 1 pagina's 81-88 |
| Jaar: |
2000-05-01 |
| Inhoud: |
Needle-like goethite particles were synthesized by air oxidation of an alkaline suspension of ferrous hydroxide using a standard-type bubble column of 10cm in internal diameter and 64 cm in height at a constant temperature of 40°C. Specifically, the effect of aging step by N2 stream prior to the oxidation step was investigated on both the oxidation rate and the final particle size based on the major axis of needle-like goethite particle. The time dependence of the fractional oxidation of total ferrous species with incorporated aging step exceeded that in the absence of aging step. The velocity of N2 in the aging step had negligible influence on the time dependence of the fractional oxidation. For the aging period exceeding 30min, the mean particle size was almost independent of the aging period. The mean size could be correlated considerably well with the oxidation rate, that is, decreased with increasing oxidation rate with and without incorporated aging step. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 13 gevonden artikelen
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