KINETIC STUDIES ON FERROCOLUMBITE CONCENTRATE BY SULFURIC ACID DISSOLUTION AT ABU RUSHEID CATACLASTIC ROCKS, SOUTH EASTERN DESERT, EGYPT | ||||
| Nuclear Sciences Scientific Journal | ||||
| Article 13, Volume 3, Issue 1, 2014, Page 191-199 PDF (419.19 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/nssj.2014.30974 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| DOAA I. ZAKI; GADAH M. HUSSEIN; MOHAMED ELDEMERDASH; MOHAMED E. IBRAHIM | ||||
| Nuclear Materials Authority,Cairo, Egypt | ||||
| Abstract | ||||
| A kinetic study of the leaching of Abu Rusheid ferrocolumbite concentrate sample in sulfuric acid media under atmospheric pressure has been investigated. The effects of reaction temperature, sulfuric acid concentration, stirring speed, particle size and solid/liquid mass ratio on the dissolution rate of ferrocolumbite were examined. It is found that the dissolution rate of ferrocolumbite significantly increases with increasing acid concentration, temperature, stirring speed and decreasing the particle size. By using 3M H2SO4 solution, about 89% of ferrocolumbite was dissolved within 140 minutes using < 0.053 mm particle size at a temperature of 75 0C and a stirring speed of 360 rpm. The experimental data were well interpreted with a shrinking core model under diffusion control through the product layer, where the following rate equation was established: 1+2 (1- X) – 3 (1- X) 2/3= = k2t The result of the study indicated that the leaching data fitted a diffusion model. Values of 0.7993, 23.64 kJmol-1 and 1.24 X 10-3 min-1 were calculated as reaction order, activation energy and Arrhenius constant, respectively for the dissolution process. | ||||
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