%0 Journal Article
%T Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue
%A Ali Reza Eivazi Hollagh
%A Eskandar Keshavarz Alamdari
%A Davooud Moradkhani
%A Ali Akbar Salardini
%J International Journal of Nonferrous Metallurgy
%P 10-20
%@ 2168-2062
%D 2013
%I Scientific Research Publishing
%R 10.4236/ijnm.2013.21002
%X <p class=\"MsoNormal\" style=\"text-align:justify;\">
	<span lang=\"EN-US\">The sulfuric acid leaching of zinc plant
residues was studied in an attempt to find a suitable hydrometallurgical method
for zinc recovery. The parameters evaluated consist of reaction time,
Solid-to-liquid-ratio, reaction temperature, agitation rate and pH. The
results of kinetic analysis of the leaching data under various experimental
conditions indicated that there is a reaction controlled by the solution
transport of protons through the porous product layer with activation energy of
about 1 kJ/mol for different constant solid to liquid ratios. Based on the
shrinking core model (SCM), the following semiempirical rate equation was
established:</span><span lang=\"EN-US\" style=\"font-family:;\" \"=\"\">1-3(1-a)2/3+2(1-a)=0.001187¡Á[H<sup>+</sup>]<sup>0.016</sup>¡Á[(S/L)]<sup>-</sup><sup>1.34</sup>¡Áexp(-1/RT)
¡Á<i>t</i></span><span lang=\"EN-US\">. On the other hand, activation
energy was obtained from a model-free method using isothermal measurements.
Values for activation energy were calculated as a result of the conversion
function with an average of 2.9 kJ/mol. This value is close to that determined
previously, using shrinking core model (SCM).</span><span lang=\"EN-US\" style=\"font-family:;\" \"=\"\"><o:p></o:p></span> 
</p>
<div style=\"text-align:justify;\">
</div>
%K Zinc
%K Hydrometallurgy
%K Kinetic Model
%K Zinc Plant Residue
%K Model-Free Method
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=27175