Özet:

In galvanic cakes and municipal wastewater sludge, there are significant amounts of heavy non-ferrous metals, which are classified as hazard class I ecotoxicants and are currently being disposed. The existing methods of toxic waste processing do not provide for the selection and efficient recovery of valuable components. However, the cost of non-ferrous and precious metals and their industrial content in these types of technogenic waste allow justifying the payback and profitability of their industrial processing. Based on the laboratory and large-scale laboratory experiments, flow diagrams of processing of galvanic cakes and wastewater sludge are proposed. The calculated kinetic and thermodynamic characteristics (activation energy, time of complete dissolution, Gibbs free energy value), the recovery parameters of heavy non-ferrous metals (εCu=99.5 %, εNi=99.5 %, εZn=99.9 %) indicate the possibility of industrial implementation of the given flow diagrams. Dependencies of copper recovery on temperature and leaching time are presented. The obtained results allow speaking about the kinetic limitation of the process of galvanic cake leaching (ЕCu=15.7 kJ/mol) and demonstrate the possibility of conducting the process at low temperatures (t=40 oC), which leads to lower energy consumption. The advantage of the proposed options of processing of galvanic cakes and wastewater sludge is the presence of commercial equipment, the use of traditional hydrometallurgical processes, availability and low cost of reactants, short payback periods and anthropogenic load reduction. Author Biographies Mikhail Barkan, Saint-Petersburg Mining University 21 Line, 2, Saint-Petersburg, Russia, 199106 PhD, Associate ProfessorDepartment of Geoecology

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