Liquid Copper and Iron Production from Chalcopyrite, in the Absence of Oxygen

Clean energy infrastructure depends on chalcopyrite: the mineral that contains 70% of the world’s copper reserves, as well as a range of precious and critical metals. Smelting is the only commercially viable route to process chalcopyrite, where the oxygen-rich environment dictates the distribution of impurities and numerous upstream and downstream unit operations to manage noxious gases and by-products. However, unique opportunities to address urgent challenges faced by the copper industry arise by excluding oxygen and processing chalcopyrite in the native sulfide regime. Through electrochemical experiments and thermodynamic analysis, gaseous sulfur and electrochemical reduction in a molten sulfide electrolyte are shown to be effective levers to selectively extract the elements in chalcopyrite for the first time. We present a new process flow to supply the increasing demand for copper and byproduct metals using electricity and an inert anode, while decoupling metal production from fugitive gas emissions and oxidized by-products.

[1]  A. Allanore,et al.  Selective Sulfidation for Rare Earth Element Separation , 2022, Rare Metal Technology 2022.

[2]  Gerardo R. F. Alvear Flores,et al.  Electrolytic refining , 2022, Extractive Metallurgy of Copper.

[3]  A. Allanore,et al.  Selective sulfidation of metal compounds , 2021, Nature.

[4]  D. Sbarbaro,et al.  The use of solar energy in the copper mining processes: A comprehensive review , 2021 .

[5]  A. Allanore,et al.  Non-standard state thermodynamics of metal electrodeposition , 2021 .

[6]  L. Alagha,et al.  Towards resilient and sustainable supply of critical elements from the copper supply chain: A review , 2021, Journal of Cleaner Production.

[7]  A. Allanore,et al.  Liquid state properties and solidification features of the pseudo binary BaS-La2S3 , 2021, Scientific Reports.

[8]  A. Tukker,et al.  Assessing the future environmental impacts of copper production in China: Implications of the energy transition , 2020, Journal of Cleaner Production.

[9]  A. Allanore,et al.  Electrolytic production of copper from chalcopyrite , 2020, Current Opinion in Electrochemistry.

[10]  Yongpeng Ma,et al.  A Review of the Comprehensive Recovery of Valuable Elements from Copper Smelting Open-Circuit Dust and Arsenic Treatment , 2020, JOM.

[11]  W. Nowak,et al.  Renewable energy in copper production: A review on systems design and methodological approaches , 2020 .

[12]  Levent Kartal,et al.  Direct electrochemical reduction of copper sulfide in molten borax , 2019, International Journal of Minerals, Metallurgy, and Materials.

[13]  F. Pagnanelli,et al.  Iodide-assisted leaching of chalcopyrite in acidic ferric sulfate media , 2019, Hydrometallurgy.

[14]  G. Corder,et al.  Re-thinking complex orebodies: Consequences for the future world supply of copper , 2019, Journal of Cleaner Production.

[15]  E. Olivetti,et al.  High‐Resolution Insight into Materials Criticality: Quantifying Risk for By‐Product Metals from Primary Production , 2019 .

[16]  J. Allwood,et al.  Finding the Most Efficient Way to Remove Residual Copper from Steel Scrap , 2019, Metallurgical and Materials Transactions B.

[17]  Kirsten Francescone Tracing indium production to the mines of the Cerro Rico de Potosí , 2018, Economic Anthropology.

[18]  Leili Tafaghodi Khajavi,et al.  Extraction of nickel and cobalt from nickeliferous limonitic laterite ore using borax containing slags , 2017 .

[19]  T. Okabe,et al.  Experimentally Determined Phase Diagram for the Barium Sulfide-Copper(I) Sulfide System Above 873 K (600 °C) , 2017, Metallurgical and Materials Transactions B.

[20]  S. Sahu,et al.  Electrolytic Extraction of Copper, Molybdenum and Rhenium from Molten Sulfide Electrolyte , 2017 .

[21]  A. Allanore,et al.  Electrochemical Study of a Pendant Molten Alumina Droplet and Its Application for Thermodynamic Property Measurements of Al-Ir , 2017 .

[22]  Mingsheng Tan,et al.  Electrochemical sulfur removal from chalcopyrite in molten NaCl-KCl , 2016 .

[23]  L. Ciacci,et al.  Copper demand, supply, and associated energy use to 2050 , 2016 .

[24]  Sang‐Kwon Lee,et al.  Electrochemistry of Molten Sulfides: Copper Extraction from BaS-Cu2S , 2016 .

[25]  N. T. Nassar,et al.  Criticality of metals and metalloids , 2015, Proceedings of the National Academy of Sciences.

[26]  Antoine Allanore,et al.  Features and Challenges of Molten Oxide Electrolytes for Metal Extraction , 2015 .

[27]  Jan D. Miller,et al.  Recent Trends in the Processing of Enargite Concentrates , 2014 .

[28]  Gavin M. Mudd,et al.  Modelling future copper ore grade decline based on a detailed assessment of copper resources and mining , 2014 .

[29]  T. Graedel,et al.  Global anthropogenic tellurium cycles for 1940–2010 , 2013 .

[30]  G. Kaptay The conversion of phase diagrams of solid solution type into electrochemical synthesis diagrams for binary metallic systems on inert cathodes , 2012 .

[31]  M. Sturzenegger,et al.  Decomposition of copper concentrates at high-temperatures: An efficient method to remove volatile impurities , 2008 .

[32]  Fathi Habashi,et al.  Abandoned but not forgotten : The recent history of copper hydrometallurgy , 2006 .

[33]  Ari Jokilaakso,et al.  Flash smelting and converting furnaces: A 50 year retrospect , 2000 .

[34]  J. Elliott,et al.  SMELTING OF IRON-OXY-SULFIDE MELTS USING SOLID CARBON , 1994 .

[35]  T. Nagasaka,et al.  Copper Distribution between FeS-Alkaline or -Alkaline Earth Metal Sulfide Fluxes and Carbon Saturated Iron Melt. , 1991 .

[36]  Y. Nakagawa Liquid immiscibility in copper-iron and copper-cobalt systems in the supercooled state , 1958 .

[37]  R. Vivian The Electrolysis of Molten Antimony Sulfide , 1936 .