Arsenic speciation in mining wastes - case studies in systems dominated by ferric sulfo-arsenates

• Applicant: Professor Juraj Majzlan, Ph.D.
• Subject Area: Mineralogy, Petrology and Geochemistry
• Term: from 2012 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 231489005

• Final Report Year: 2015

Final Report Abstract

Within this project, we have - determined the crystal structure of bukovskýite and the BFAS phases; - determined the thermodynamic properties of bukovskýite, the Ca-Fe arsenates arseniosiderite and yukonite, BFAS phases and zýkaite; - calculated phase diagrams for these phases; - carried out forward modeling and determined the saturation conditions in reactions which can realistically occur in soils and mine wastes; - additionally characterized the studied phases by spectroscopic techniques, especially by EXAFS. For the near future, we are planning the final step of the project in terms of application of the thermodynamic data to the case study field site near the city of Kutná Hora, together with the Czech co-PI of this proposal, Dr. Petr Drahota, of the Charles University in Prague.

Publications

• 2013: Characterization of ferric arsenate-sulphate compounds with implications on arsenic control in refractory gold processing residues. American Mineralogist 98, 554-565
  Paktunc, D., Majzlan, J., Palatinus, L., Dutrizac, J., Klementová, M., Poirier, G.
  
• 2015: Thermodynamic properties of zýkaite, a ferric sulfoarsenate. Applied Geochemistry 61, 294-301
  Majzlan, J., Amoako, F.Y., Kindlová, H., Drahota, P.