Abstract: A material benefication process and device for dressing a material comprising noble metals including platinum group metals. The device includes a reactor vessel with an inlet and an outlet for the processing medium. The material to be processed and a holder for the material are located inside the reactor vessel. The holder has a device for distributing the used processing medium flow. The process includes subjecting the material to an oxidizing treatment at a temperature within a first distinct temperature range, subjecting the material to a reducing treatment at a temperature within a second distinct temperature range, and chlorinating the material at a temperature within a third distinct temperature range different from at least the first distinct temperature range.

Abstract: The invention concerns a silver refining installation operating according to the Moebius method and designed for treating particulate raw silver. The anodes contain a section for receiving the raw silver, an underlying section for receiving anodic slime and, inserted between these two sections a support permeable to anodic slime and designed for the raw silver overflow. The support has at least two mutually mobile conveying elements with horizontal axes extending substantially over the support length and between which a slot allows the anodic slime to pass through. The invention is characterized in that the conveying elements have a reciprocating motion in the axial direction.

Abstract: A method of processing acidic Fe-containing solutions, in particular spent (discarded) pickling solutions, by liquid/liquid extraction with organic ion exchangers wherein the solutions also contain Zn, the contents in Fe and Zn are jointly extracted in a first extraction step, the first organic extract obtained which is charged with Fe.sup.3+, Fe.sup.2+ and Zn.sup.2+ is used for a renewed extraction of fresh solution wherein the Fe.sup.2+ -content of the first extract is exchanged for the Zn.sup.2+ -content of the fresh solution, and that the Zn.sup.2+ -content is separated from the second organic extract by stripping with acid. In particular, the renewed extraction is carried out at a pH value which is changed as compared to the pH value of the first extraction.