|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Environmental Aspects of the Electrochemical
Recovery of Tellurium by Electrochemical
||Petteri Halli, Marja Rinne, Benjamin Wilson, Kirsi Yliniemi, Mari Lundstrom
|On-Site Speaker (Planned)
The current study investigates the energy consumption and the corresponding global warming potential (GWP) of tellurium recovery from multimetal solution by the use of a tailored electrochemical recovery approach based on electrodeposition-redox replacement (EDRR). A three electrode cell was used to recover Te from synthetically prepared pregnant leach solution similar to the PLS of leached Doré slag (30% aqua regia, [Cu] = 3.9 g/L, [Bi] = 4.6 g/L, [Fe] = 1.4 g/L, and [Te] = 100-500 ppm). Enrichment of Te on the electrode (with 100 EDRR cycles) had a calculated global warming potential of 3.7 CO2 -eqv from a solution with 500 ppm Te based on a Finnish energy mix. In comparison, a decrease of Te concentration to 100 ppm increased the corresponding environmental impact to 16.9 CO2 -eqv. Overall, GWP was shown to be highly dependent on the geographical area i.e. the dominating energy production methods.