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Recycling of Gold From Waste Electrical and Electronic Equipment by Electrorefining of Copper

Wędrychowicz Maciej, Piotrowicz Andrzej, Gabryelewicz Izabela, Stryjski Roman, Krupa Patryk, Okoniewska Oliwia, Besta Petr, Samolejová Andrea

Rocznik Ochrona Środowiska

2022

Tom 24

371--382

This article presents the methods of processing gold-plated pins from, among others, used computer equipment and discusses the research results on the recovered metal. Due to the relatively small structure of the pins and the fact that the gold layer is only a few microns thick, recovering gold from them constitutes a significant challenge. On the other hand, gold is a precious metal which enables the collective removal of other metals to obtain pure gold. The suggested method involves compacting the gold-plated pins into an anode form and carrying out the electro-refining process. Metals, such as copper, tin and iron, pass into the anode sludge from which they can be extracted or serve as a commercial intermediate sold to smelter plants. The anode sludge was melted in the flame of an oxy-acetylene torch in a graphite crucible by adding borax. As a result of the melting, several metallic precipitates were obtained. Then they were hot-incorporated into a sample with a diameter of 30 mm and a height of 12 mm. Eventually, a pure gold alloy sample was obtained, which contains Cu 40.69%, Sn 9.61% and Au 48.58%.

Piro i hydrometalurgiczny odzysk metali nieżelaznych z konkrecji oceanicznych

Piotrowicz Andrzej, Pietrzyk Stanisław, Czarny Karol, Płachta Paweł

Inżynieria Mineralna

2019

R. 21, nr 1/2

319--325

Celem pracy było zbadanie możliwości odzysku metali nieżelaznych z konkrecji polimetalicznych pochodzących z dna morskiego metodami piro i hydrometalurgicznymi. W metodzie pirometalurgicznej zbadano wpływ dodatku lepiszcza oraz dodatku składnika żużlotwórczego na wydajność procesu redukcji. Redukcja miała doprowadzić do rozdziału frakcji bogatej w Mn i Fe (faza żużla) od fazy metalicznej zawierającej metale nieżelazne (głównie Cu i Ni). Natomiast metoda hydrometalurgiczna polegała na wyługowaniu do roztworu manganu i żelaza za pomocą kwasu mineralnego bez i z dodatkami kwasów organicznych. Na obecnym etapie badań dla każdej z zastosowanych metod, uzyskano rozdział metali żelaznych od nieżelaznych i koncentraty tych ostatnich nadające się do dalszego przerobu technologiami pirometalurgii miedzi.

The aim of the study was to investigate the possibilities of recovering non-ferrous metals from polymetallic nodules originating from the ocean floor by pyro- and hydrometallurgical methods. In the pyrometallurgical method, the effect of the addition of the binder and the slag-forming component on the efficiency of the reduction process was examined. The reduction was to lead to separation of the fraction rich in Mn and Fe (slag phase) from the metallic phase containing non-ferrous metals (mainly Cu and Ni). The hydrometallurgical method, on the other hand, consisted in leaching of manganese and iron into the solution with mineral acid without and with the addition of organic acids. At the current stage of research for each of the methods used, separation of ferrous and non-ferrous metals was obtained and concentrates of these last ones suitable for further processing by copper pyrometallurgy technologies.

Dissolution of manganese (IV) oxide from tantalum capacitor scrap by organic acids

Piotrowicz Andrzej, Pietrzyk Stanisław

Acta Innovations

2019

no. 32

63--77

The dissolution of MnO2 from tantalum capacitor scrap using organic acids in various process conditions was studied. The initial materials were of two types: LTC (leaded tantalum capacitors) and SMDTC (surface-mounted device tantalum capacitors). The research materials were prepared by pyrolysis, grinding and sieving and the preparation processes were characterized. Dissolution of MnO2 was carried out with the use of sulfuric acid solutions with the addition of acetic, ascorbic, citric and oxalic organic acids. Results show that the addition of organic acids significantly improves dissolution yields (72-94 vs 90-99 % for H2SO4 and acid mixtures, respectively). In practice, a concentration of organic acid above 1 M results in the complete removal of MnO2.