STUDY THE KINETIC OF RECOVERY OF VANADIUM FROM OIL FIRED POWER STATIONS

In this work, it was attempted to study the kinetic of vanadium recovery from fly ash residue by leaching with NaOH solution from previous work of Mosa (1999).The selected data was chosen when particle size of fly ash were 125, 150 and 200 µm, temperature 343, 353 and 373 K, reaction (leaching) time from 1 to 8 hours and at almost constant concentration of  NaOH solution (molarity 3, 3.5 and 4 M).The results showed that vanadium recovery increased with time and temperature and decreased with particle size.A second degree polynomial mathematical correlation was employed to describe vanadium recovery response. The correlation coefficient of the obtained correlation was 0.9990 and variance of 0.9981 with confidence levels of 95 %.Kinetic study showed that the chemical reaction was the controlling step which had the highest resistance among other steps and estimated time for complete conversion of vanadium was about 7 hours. The chemical reaction order was found equals to -3 with activation energy of 1080 J/ mole and frequency factor of about 2.6884.