Kinetics for recovery of zinc from ashes of galvanized with hydrochloric acid
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Abstract
he leaching of zinc from galvanic ashes was carried out using hydrochloric acid. Ashes composition includes metal zinc, oxide and hydroxide according to the X-rays diffractrometry, being the greater component the oxide (49%). The ashes are powders of irregular shape. Powders with smaller mean diameter gave the higher rates. The plots of the shrinking core model controlled by the chemical reaction gave good linearity. Also the leaching rate did not depend on stirring and the estimated activation energy gave a value of 18,4 kJ/mol. All these facts are fully discussed. The rate of the reaction based on shrinking core model can be expressed by a semi-empirical equation as
12784 e -18400/RT CALO1.4686
[1-(1-XB)1/3]= ---------------------------------------- t + 0.1012; t ≥1 min
ΡBR0
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