Process of making high purity, synthetic FeS2, and an electrochemical battery employing such synthetic FeS2 in the positive electrode. Synthetic FeS2 may be prepared by a sulfidation process comprising reacting ferric oxide, hydrogen sulfide, and elemental sulfur at a temperature above the melting point...http://www.google.es/patents/US7799311?utm_source=gb-gplus-sharePatente US7799311 - Processes for producing synthetic pyrite
