FLOTATION OF ALUMINA FROM GIBBSITE BEARING–SHALE OF SOUTH WESTERN SINAI, EGYPT BY USING SODIUM DODECYL SULFATE | ||
| JES. Journal of Engineering Sciences | ||
| Article 13, Volume 36, No 3, May and June 2008, Pages 731-747 PDF (199.96 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.21608/jesaun.2008.116165 | ||
| Authors | ||
| M. M. Ahmed1; G. A. Ibrahim1; I. E. Elaassy2; H. G. Ahmed2 | ||
| 1Mining and Metallurgical Engineering Department, Faculty of Engineering, Assiut University, Assuit 71516, Egypt | ||
| 2Nuclear Materials Authority, Egypt | ||
| Abstract | ||
| Samples of gibbsite bearing–shale of south western Sinai, Egypt were studied to upgrade the low grade alumina. The assays of the samples are about 18.98% Al2O3, 15.45% SiO2, 12.83% Fe2O3, 14.87% CaO, 5.74% P2O5, 5.34% MnO, 0.86% K2O, 0.76% Na2O, 1.50% trace elements and 23.65% loss on ignition. The aim of upgrading alumina in the concentrate is to make it suitable for the different industrial uses. Sodium dodecyl sulfate (an anionic collector) is effective in the acidic pH range. Below the isoelectric point of gibbsite where the alumina is positively charged, the sodium dodecyl sulfate was good at pH value of 2. Under appropriate conditions (collector dosage=800g/t, pulp density=300g/l and particle size=-100+80 µm) and at pH=2, a concentrate containing 39.5% alumina at component recovery of 96.9% and mass recovery of 52.8% was obtained. At these conditions, the assays of other ore constituents in the final concentrate are as follows: SiO2 was decreased from 14.2% to 6.4%, CaO was decreased from 14.1% to 5.2%, Fe2O3 was decreased from 13.1% to 5.6%, P2O5 was decreased from 4.3% to 3.8%, MnO was decreased from 4.2% to 3.2%, while K2O was increased from 0.89% to 1.2%, Na2O was increased from 0.69% to 1.1%, traces was increased from 1.6% to 2.6%, and loss on ignition was increased from 25.4% to 31.2%. The component recoveries of SiO2, CaO, Fe2O3, P2O5, MnO, K2O, Na2O, and traces in the final concentrate were 23.8%, 19.5%, 22.6%, 46.6%, 40.2%, 39.1%, 33.1%, and 85.8%, respectively. | ||
| Keywords | ||
| Gibbsite; alumina flotation; collectors; isoelectric point; pH; pulp density; particle size | ||
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