PROCESS FOR RECOVERING PRECIOUS METALS FROM ELECTRICAL AND ELECTRONIC WASTE BY ANODIC DISSOLUTION IN IONIC LIQUIDS

The invention relates to a process for recovering usual metals such as Cu, Sn, Pb, Al and Ni and precious metals, Au and Ag, comprised in waste electrical and electronic equipments, such as PCs, mobile phones, audio-video apparatuses, automation equipments and the like. According to the invention, t...

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Hauptverfasser: SOARE VASILE, CONSTANTIN VIRGIL-CORNEL, DUMITRESCU DANIELA VIOLETA, CONSTANTIN IONUŢ, DONATH CRISTINA, BUZATU MIHAI, POPESCU ANA-MARIA JULIETA, BURADA MARIAN, NEACŞU ELENA IONELA
Format: Patent
Sprache:eng ; rum
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Zusammenfassung:The invention relates to a process for recovering usual metals such as Cu, Sn, Pb, Al and Ni and precious metals, Au and Ag, comprised in waste electrical and electronic equipments, such as PCs, mobile phones, audio-video apparatuses, automation equipments and the like. According to the invention, the process comprises the following stages: a. processing the waste by milling, melting in microwave oven, separating the organic fraction which represents 45...50% of waste, casting them as a multicomponent metal ingot with the following chemical composition: 45...50% Cu, 15...25% Sn, 12...18% Pb, 2..4% Al, 0.5...1.5% Fe, 0.5...1% Ag, 0.1...0.2% Au and 0.5...1.5 % other elements, b. anodically dissolving the ingot in a electrolyte based on HSO-CuSOwhile recovering Cu or Cu-Sn alloy at the cathode and concentrating insoluble metals in the electrolyte as anodic mud, c. melting the resulting anodic mud and casting it as an ingot, d. selectively anodically dissolving the anodic mud ingot, melt in an electrolyte based on ionic liquids, consisting of a mixture of organic choline chloride salts and ethylene glycol which form an eutectic mixture, the anodic dissolution taking place in a glass vessel at a temperature ranging between 20...25°C by using a Cu cathode, Ag of a purity of 99.5% at a cell voltage of 0.1...0.25 V at the cathode there being obtained, as well as Au of a purity of 99% at a cell voltage of 0.4...0.5 V. Invenţia se referă la un procedeu de recuperare a metalelor uzuale, cum sunt Cu, Sn, Pb, Al şi Ni, şi a metalelor preţioase Au şi Ag, existente în componenţa deşeurilor de echipamente electrice şi electronice, ca PC-uri, telefoane mobile, aparatură audio-video, echipamente de automatizare şi altele asemenea. Procedeul conform invenţiei are următoarele etape: a. prelucrarea deşeurilor prin măcinare, topire în cuptor cu microunde, separare de fracţia organică ce reprezintă 45...50% din deşeuri, şi turnarea sub formă de lingou metalic multicomponent, cu următoarea compoziţie chimică: 45...50% Cu, 15...25% Sn, 12...18% Pb, 2...4% Al, 0,5...1,5% Fe, 0,5...1% Ag, 0,1...0,2% Au şi 0,5...1,5% alte elemente; b. dizolvarea anodică a lingoului într-un electrolit pe bază de HSO- CuSOcu recuperarea la catod de Cu sau aliaj Cu - Sn, şi concentrarea metalelor insolubile în electrolit sub formă de nămol anodic; c. topirea nămolului anodic rezultat, şi turnarea sub formă de lingou; d. dizolvarea anodică selectivă a lingoului de nămol anodic, topit într-un electrolit p