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Abstract
The present work is concerned with the study of the factors affecting the rate of extraction of copper from industrial waste solutions by naphthenic acids using oscillating perforated disc as a mean for enhancing the rate of mass transfer between the aqueous and the organic phase, Variables studied were frequency and amplitude of oscillation (vibration intensity), copper ion concentration. phase ratio, temperature disc diameter, hole diameter and hole number. Naphthenic acids were dissolved in kerosene and their concentration kept constant throughout the work at the value of 0.1 M. The Investigation showed the following Results:
1. The rate of mass transfer and the rate of extraction increases the vibrating velocity according to the equation:
K = a Vi
2. The rate of mass transfer and the rate of extraction decrease with increasing the copper ions concentration in the aqueous phase.
3. The rate of mass transfer and the rate of extraction increase with increasing the frequency and amplitude of oscillation.
4. The rate of mass transfer and the rate of extraction decrease with increasing the phase ratio (aqueous/organic).
5. The rate of mass transfer and the rate of extraction increase with decreasing disc diameter increasing both holes diameter and holes number
6. The rate of mass transfer and the rate of extraction increase with increasing the temperature according to arrhenius equation:
K = A e-E/RT
7. The activation energy of the extraction process was found to be 1.6 kcal/mol denoting diffusion controlled process.
8. The over all mass transfer coefficient of the extraction process \\as estimated. The data was found to fit the equation:
Sh = 6.05 Re0.8 Sc0.33 (d/Dh)
With an average deviation of 15.5%.The technical importance of the present worl.;. in the area of copper purification and extraction from low grade copper orcs and waste streams resulting from metal finishing industry was pointed.