Chile is encountering a growing number of sulfur-based ore layers containing toxic arsenic in its copper mines.
German and Chilean researchers are working on a project aimed at optimizing and advancing copper production processes with a particular focus on addressing the problems posed by sulfur-based ores that contain arsenic.-, the red metal is extracted mostly from open-pit mines. Ore is blasted from holes with diameters of up to two kilometers.
“These two developments are now making Chilean mine operators rethink the way in which they previously disposed of arsenic and adapt to these new circumstances without delay,” Anna-Lisa Bachmann, who coordinates the ‘ReAK—Reduction of Arsenic in Copper Concentrates’ project, said in a media statement. “We are investigating new ways of separating and depositing the arsenic as part of this project so that the environmental impact is minimized as much as possible.
“One option for this oxidation step could be the use of hydrogen peroxide, but this is very expensive,” Bachmann said. “This is why we at Fraunhofer IWKS are investigating electrochemical oxidation with diamond electrodes as a viable alternative in the course of this project. They feature a particularly large electrochemical window, resulting in the formation of hydroxyl radicals in aqueous solutions.
The first step of all work packages is to test whether the method in question actually works and whether it delivers the desired result. Fraunhofer IWKS will compare their cost-effectiveness and environmental impact in the context of life cycle assessment and life cycle costing analyses as soon as all of the individual results are available.
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