Abstract: A method of recovering silver from a silver chloride mixture in which hydrogen gas is passed through the mixture to produce a metal chloride hydride which is then heated to dissociate the metal and to release hydrogen chloride gas.

Abstract: A method of recovering silver from a silver chloride mixture in which hydrogen gas is passed through the mixture to produce a metal chloride hydride which is then heated to dissociate the metal and to release hydrogen chloride gas.

Abstract: Disclosed is a method for producing at least one chemical reaction product by chemically reacting one or several reactants that is/are optionally dissolved in one or several solvents and is/are supplied as a feed stream by bringing the same in contact with a heterogeneous catalyst in a continuously operated fixed-bed reactor which is filled with a particle bed, a continuous annular chromatograph (CAC) that is filled with the particle bed being used as a fixed-bed reaction in which the at least one reaction product is formed and purified while the at least one purified reaction product as well as optionally provided secondary products and/or non-reacted reactants are withdrawn at a different, predetermined azimuthal position of the annular chromatograph, respectively. The inventive method is characterized in that only one type of particle material is used in a single particle bed as both a formation catalyst and a chromatographic medium for purifying the at least one reaction product in the particle bed.

Abstract: Disclosed is a method for producing at least one chemical reaction product by chemically reacting one or several reactants that is/are optionally dissolved in one or several solvents and is/are supplied as a feed stream by bringing the same in contact with a heterogeneous catalyst in a continuously operated fixed-bed reactor which is filled with a particle bed, a continuous annular chromatograph (CAC) that is filled with the particle bed being used as a fixed-bed reaction in which the at least one reaction product is formed and purified while the at least one purified reaction product as well as optionally provided secondary products and/or non-reacted reactants are withdrawn at a different, predetermined azimuthal position of the annular chromatograph, respectively. The inventive method is characterized in that only one type of particle material is used in a single particle bed as both a formation catalyst and a chromatographic medium for purifying the at least one reaction product in the particle bed.

Abstract: A continuous annular chromatography (CAC) device is disclosed including a stationary column head, a stationary eluate ring, a rotating body which is located between said column head and said collecting ring and which can rotate about a vertical axis and contains a chromatographic separating medium and a drive device. An extension can be coupled to a drive shaft of the drive device with a rapidly detachable connection.

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 relates to a CAC device comprising a stationary column head, a stationary eluate collecting ring, a rotating body which is located between said column head and said collecting ring and which can rotate about a vertical axis and contains a chromatographic separating medium; and a drive device. Said rotating body (1) is connected to a rotating platform (4) at its bottom end. This rotating platform (4) is slidingly, sealingly guided on the eluate collecting ring (5) and has an extension on the underside. The extension can be coupled to a drive shaft (2) of the drive device (8) with a rapidly detachable connection and the stationary column head the rotating body (1) with the rotating platform (4) and the attached eluate collecting ring (5) can be connected to form a CAC module and can be removed from the drive shaft (2) as a unit. The invention also relates to an inverse CAC method using the inventive device.

Abstract: The invention related to an annular chromatograph including a particle bed which rotates on a rotary plate (3), said plate having eluate drainage lines, with regard to a stationary base and a stationary feeder head (10) with continuous feeder lines. The annular chromatograph has a central column (2) provided on a rotary plate and extending upwards through the feeder head. A tightening device (16,17) for pressing the feeder head (10) on the cylinder sleeve (6) is arranged on said column.

Abstract: Disclosed is an assembly for continuous annular chromatography provided with a relative movement between one partial bed in the form of a cylinder jacket, at least one feeding position for liquid feeding material and at least one collection position for every emerging fraction of the feeding material out of the partial bed.

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.

Abstract: An electrolytic silver refining process in which crude silver is anodically dissolved and refined silver is cathodically deposited and at the same time accompanying metals are selectively extracted from the spent electrolyte and separately cathodically deposited after having been transferred into an aqueous phase and the regenerated electrolyte stripped of accompanying metals is recycled to the refining process and in which further the spent electrolyte is anodically enriched in silver and accompanying metals are cathodically deposited from the aqueous phase in a joint electrolysis step.

Abstract: In an electrolytic silver refining process, crude silver is anodically dissolved while refined silver is cathodically deposited and at the accompanying (impurity) metals are selectively extracted from the used (spent) electrolyte and transferred to an aqueous phase. The used electrolyte is enriched in silver and accompanying metals are cathodically deposited and thus removed from the electrolyte. For this purpose, a specific electrolysis cell is provided. The cell being preferably a diaphragm cell with an anionic diaphragm. The extraction of the accompanying metals is achieved by liquid membrane permeation, preferably combined with solvent extraction.