energies Article Energy Consumption and Greenhouse Gas Emissions of Nickel Products Wenjing Wei 1,2,*, Peter B. Samuelsson 1 , Anders Tilliander 1, Rutger Gyllenram 1,2 and Pär G. Jönsson 1 1 Department of Materials Science and Engineering, Royal Institute of Technology, 114 28 Stockholm, Sweden;
[email protected] (P.B.S.);
[email protected] (A.T.);
[email protected] (R.G.);
[email protected] (P.G.J.) 2 Kobolde &Partners AB, Ringvägen 100, 118 60 Stockholm, Sweden * Correspondence:
[email protected] Received: 25 September 2020; Accepted: 26 October 2020; Published: 29 October 2020 Abstract: The primary energy consumption and greenhouse gas emissions from nickel smelting products have been assessed through case studies using a process model based on mass and energy balance. The required primary energy for producing nickel metal, nickel oxide, ferronickel, and nickel pig iron is 174 GJ/t alloy (174 GJ/t contained Ni), 369 GJ/t alloy (485 GJ/t contained Ni), 110 GJ/t alloy (309 GJ/t contained Ni), and 60 GJ/t alloy (598 GJ/t contained Ni), respectively. Furthermore, the associated GHG emissions are 14 tCO2-eq/t alloy (14 tCO2-eq/t contained Ni), 30 t CO2-eq/t alloy (40 t CO2-eq/t contained Ni), 6 t CO2-eq/t alloy (18 t CO2-eq/t contained Ni), and 7 t CO2-eq/t alloy (69 t CO2-eq/t contained Ni). A possible carbon emission reduction can be observed by comparing ore type, ore grade, and electricity source, as well as allocation strategy. The suggested process model overcomes the limitation of a conventional life cycle assessment study which considers the process as a ‘black box’ and allows for an identification of further possibilities to implement sustainable nickel production.