ORALS

SESSION: RecyclingSatPM3-R1	Kozlov International Symposium on Sustainable Materials Recycling Processes and Products (7th Intl. Symp. on Sustainable Materials Recycling Processes and Products)
Sat Oct, 26 2019 / Room: Ambrosia A (77/RF)
Session Chairs: TBA Session Monitor: TBA

17:50: [RecyclingSatPM313]
Turning the Extractive-Waste Problems Into a Resource-Recovery Opportunity
Teodor Velea¹ ; Alexandra-georgiana Vatui² ; Ionut Macarescu² ; Ioana Andreea Chirea² ; Mika Paajanen³ ; Lieven Machiels⁴ ; Carlos Frias Gomez⁵ ; Vasile Predica⁶ ; Manuel Sevilla⁷ ; ¹National Research- Development Institute for Nonferrous and Rare Metals- IMNR Bucharest, Romania, Pantelimon, Romania; ²National Research- Development Institute for Nonferrous and Rare Metals- IMNR Bucharest, Romania, ILFOV, Romania; ³VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD, Tampere, Finland; ⁴, Heverlee, Belgium; ⁵Cobre las Cruces, S.A., Sevilla, Spain; ⁶National Research & Development Institute for Non-Ferrous and Rare Metals, Ilfov, Romania; ⁷COBRE LAS CRUCES (CLC), Seville, Spain;
Paper Id: 243 [Abstract]

Apart from metals, the mining and metallurgical processing of non-ferrous metals such as Cu, Pb, Zn, Au, Ag produces large volumes of waste [3]. A particular challenge is generated by waste containing residual sulphides, like pyrite, as sulphides can, upon oxidation, cause so-called acid mine drainage. This paper presents the results of experiments for advanced removal of sulphur in order to obtain near zero-waste and valuable metals products as well as other by-products [5]. The main process applied is leaching under pressure in an alkaline media (K₂CO₃, Na₂CO₃, KOH, NaOH) using air or oxygen at low to moderate temperatures and pressure (120-155^oC and 4-8 atm.) [1-2][4]. Results show that more than 96-99% of sulphur can be removed by leaching of pyrite in one stage while from an alkaline solution (coming from pressure leaching), pure crystals of K₂SO₄ / Na₂SO₄ were obtained as valuable by-products. This paper is part of the NEMO project which has received funding from the European Union, EU Horizon 2020 Programme under Grant Agreement No. 776846 - https://h2020-nemo.eu/.

References:
[1] T. Velea, V. Predica, L. Gherghe, The Sixth International Copper-Cobre Conference, Toronto 2007, Symposium on Copper Hydrometallurgy, vol. 4, pg. 221-230.\n[2] T. Velea, V. Predica, L Gherghe, International Conference Copper Metallurgy, Krakow, Poland 2011.\n[3] INTMET Project no. 689515/2015-2019 financed by EU in Horizon 2020 programme.\n[4] T. Velea, V. Predica, D. Taloi, S. Onisei Proceeding of the XV Balkan Minerals Proceeding Congress, Sozopol, Bulgaria, p 12-26, 2013.\n[5] NEMO Project Horizon 2020- No. 776846, 2018-2022, funding from EU