Abstract
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:1-3(1-a)2/3+2(1-a)=0.001187×[H+]0.016×[(S/L)]-1.34×exp(-1/RT) ×t. 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).
Highlights
Zinc is an important base metal needed for different applications in metallurgical, chemical, textile [1], agricultural, painting, and rubber industries
It was obviously observed that Pyrometallurgical and Hydrometallurgical methods or their combination could be applied for the treatment of primary and secondary zinc containing materials (ZCM)
The results indicated that the zinc plant residues (ZPR) was mostly composed of zinc, calcium, manganese and cobalt
Summary
Zinc is an important base metal needed for different applications in metallurgical, chemical, textile [1], agricultural, painting, and rubber industries. Zinc primary resources include zinc sulfide, carbonate, silicates and oxide minerals. A part of zinc is recovered by different secondary resources such as zinc ash, zinc dross, flue dusts of electric arc furnace and brass smelting, automobile shredder scrap, rayon industry sludge [1] and zinc plant residues (ZPR) etc. It was obviously observed that Pyrometallurgical and Hydrometallurgical methods or their combination could be applied for the treatment of primary and secondary zinc containing materials (ZCM). When these methods are compared, the hydrometallurgical processes are more suitable for the materials with low zinc content because of their higher zinc recoveries. In addition to some other operational advantages hydrometallurgical processes are more environmentally safe and economically feasible
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
