Abstract

Provided is a system for monitoring the condition of a metal recovery device.　The condition monitoring system comprises a metal recovery device and a control device. The metal recovery device comprises a voltage measurement unit for measuring the voltage between a negative electrode and a positive electrode. The control device comprises a data calculation unit for processing measured voltage data received from the voltage measurement unit. The data calculation unit calculates, as a feature amount, a derivative value on the basis of the voltage data, compares the feature amount against a prescribed threshold value, and when the feature amount is the threshold value or greater, diagnoses the positive electrode as being in a maintenance-required state.

IPC Classes  ?

• C25C 7/00 - Constructional parts, or assemblies thereof, of cellsServicing or operating of cells
• C25C 7/02 - ElectrodesConnections thereof
• G05B 23/02 - Electric testing or monitoring

Abstract

The purpose of the present invention is to establish a technique which enables the collection of Au from a used iodine-containing etching solution with a high collection rate and also enables the restoring of the concentration of iodine (I3-) in the etching solution to recover the etching ability of the etching solution. A method for treating a iodine-containing etching solution that contains Au, which comprises electrolyzing the etching solution to collect Au from the etching solution and restore the concentration of iodine (I3-), wherein the electrolysis is carried out while keeping the cathode potential at -0.7 V or more (wherein the reference potential is a potential of a reference electrode Ag/AgCl) and the anode potential at +1.0 V or less (wherein the reference potential is a potential of a reference electrode Ag/AgCl).

IPC Classes  ?

• C23F 1/46 - Regeneration of etching compositions
• C25C 1/00 - Electrolytic production, recovery or refining of metals by electrolysis of solutions
• C25C 1/20 - Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals

Abstract

The purpose of the invention is to provide a method that, when recovering a precious metal from an aqueous solution containing a water-soluble sulfur compound and the precious metal by electrolysis, is able to prevent the deposition of the precious metal on surfaces other than the cathode such as the anode or a wall surface of the electrolytic cell, etc. without using a chemical. The essence of this method for recovering a precious metal is that, when recovering the precious metal from an aqueous solution containing a water-soluble sulfur compound and the precious metal by electrolysis, a gas is supplied into the aqueous solution so that the redox potential of the aqueous solution during the electrolysis is -500 mV to +100 mV.

IPC Classes  ?

• C25C 1/20 - Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals

Abstract

Provided is a device, which is used when a metal is electrolytically recovered from a metal containing solution. The metal recovering device can realize more reductions in the space saving and the facility load than those of the recovering device known in the art, and can recover the metal for a short time period so that it is extremely excellent in the metal recovering efficiency. The device comprises a columnar or cylindrical rotating cathode rotating on an axis, an anode arranged to confront the rotating cathode, and a net-shaped or porous conductor. The rotating cathode confronting the anode may be constituted to have at least its face portion covered with the conductor. Alternatively, the device may also comprise a columnar or cylindrical rotating cathode rotating on an axis, and an anode arranged to confront the rotating cathode, and the rotating cathode confronting the anode may also be constituted to have at least its face portion pebbled.

IPC Classes  ?

• C25C 7/02 - ElectrodesConnections thereof