MODELING OF LEACHING PROCESS OF TIN AND LEAD FROM PRINTED CIRCUIT BOARDS OF DISCARDED HOUSEHOLD APPLIANCES

Abstract

   This paper presents the results of the reseach on leaching of tin and lead in hydrochloric acid media by method of experimental planning of general linear model. The research resultsshow that modelings are very good with excellent predictive power. Throughtworegression models, theinteractionsbetweenfactors ofhydrochloricacidconcentration, ratioof solid/liquid, reaction temperatureandleachingtimeas well astheir influenceson leaching performance were evaluated.Theoptimalconditionsof 6MHClacidconcentration,160g/L ratio ofsolid/liquid, temperature60oCandreactiontime150min alsoweredetermined. Leaching performance of tinandleadobtainedunder these conditionsis91.6% and81.4%, respectively.