In a process for the reduction of a metalliferous ore or concentrate the ore or concentrate is first prepared into a particulate form. A reaction chamber (3, 103, 203, 301, 401, 503, 603, 702) is then charged with ore or concentrate, a reductant and an input gas. The reaction chamber (3, 103, 203, 301,...http://www.google.es/patents/US7229485?utm_source=gb-gplus-sharePatente US7229485 - Plasma reduction processing of materials
