نوع مقاله : مقاله پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
Providing resources and reducing pollution in environment are the reasons for recovering metals from secondary sources such as filter cakes. Optimization, thermodynamic and kinetic modeling of effective parameters for the simultaneous leaching of four metals from low-grade filter cakes have been carried out. Temperature, particle size, time, pH, solid-to-liquid ratio and air or ozone injection rate on the leaching process are important. These parameters were checked by response surface methodology at five levels. 84.66% nickel, 85.87% copper, 74.86% cadmium and 86.13% zinc were recovered from filter cakes by endothermic and spontaneous acid leaching process. The optimal conditions are: pH 2.5, time 2.5 hr at 50 °C with 88 mic particles and ratio of solid-to-liquid 0.08 g/ml and without air/ozone injection. Four quadratic equations were proposed to relate the independent parameters for maximum recovery. The nickel and copper extraction were controlled by diffusion mechanism. The leaching of zinc and cadmium were controlled by both chemical reaction and diffusion mechanisms.
کلیدواژهها English
