Sulfuric acid leaching for capturing value from copper rich converter slag

JOURNAL OF CLEANER PRODUCTION

卷:215

Article

Khalid, Muhammad Kamran¹  Hamuyuni, Joseph¹  Agarwal, Vivek¹  Pihlasalo, Jouni²  Haapalainen, Mika²  Lundstrom, Mari¹ 

[1] Aalto Univ, Sch Chem Engn, Dept Chem & Met Engn, POB 16200, FI-00076 Aalto, Finland

[2] Outotec Res Ctr, Kuparitie 10,POB 69, FI-28101 Pori, Finland

关键词: Copper rich slag;    Leaching;    Copper recovery;    Side streams;    Circular economy;   

DOI  :  10.1016/j.jclepro.2019.01.083

来源: Elsevier

【 摘 要 】

In this research, a hydrometallurgical method for recovery of copper from copper rich converter slag is investigated. The main copper containing phases of the slag are cuprite (Cu2O), delafossite (CuFeO2) and metallic copper (Cu). The study investigates the effect of particle size, temperature, acid concentration, agitation and leaching time under oxidizing conditions. The results showed that at optimized conditions (40 degrees C, 2 M H2SO4, 60 min leaching time, 0.26 kW/m(3) mixing power, and 2000 mL/min oxygen flow rate), ca. 100% extraction of copper from slag into the solution was obtained. X-ray diffraction (XRD) analysis consolidated the experimental results by confirming that no Cu containing phases were present in the leach residue. Results also showed that temperature <= 40 degrees C had the larger influence on Cu and Fe yield, whereas higher temperature (>40 degrees C) favored Ni and Zn dissolution. The acid consumption of the optimized leaching process was found to be 23.7 mol of H2SO4 per kg of copper. (C) 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http ://creativecommons.org/licenses/by/4.0/).

【 授权许可】

Free