Formation of hydrogen peroxide by chalcopyrite and pyrite
2014 (English)Conference paper, Presentation (Refereed)
Formation of hydrogen peroxide (H2O2), an oxidizing agent stronger than oxygen, by chalcopyrite (CuFeS2), which is a copper iron sulfide mineral, during grinding, was investigated. It was observed that chalcopyrite and pyrite generated H2O2 in pulp liquid during wet grinding and also the solids when placed in water immediately after dry grinding. The generation of H2O2 in either wet or dry grinding was thought to be due to a reaction between chalcopyrite and water where the mineral surface is catalytically active in producing •OH free radicals by breaking down the water molecule. When chalcopyrite and pyrite are mixed in different proportions, the formation of H2O2 was seen to increase with increasing pyrite fraction in the mixed composition. The results of H2O2 formation in pulp liquid of chalcopyrite and together with pyrite at different experimental conditions have been explained by Eh-pH diagrams of these minerals. This study highlights the necessity of revisiting the electrochemical and/or galvanic interaction mechanisms between the chalcopyrite and pyrite.
Place, publisher, year, edition, pages
Research subject Mineral Processing
IdentifiersURN: urn:nbn:se:ltu:diva-30981Local ID: 501806cb-63eb-49ea-a6ce-68230bcbcd05OAI: oai:DiVA.org:ltu-30981DiVA: diva2:1004210
National and 1st International Geosciences Congress : rare earth elements and technology 16/02/2014 - 19/02/2014
Godkänd; 2014; 20140331 (alijav)2016-09-302016-09-30Bibliographically approved