Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1995-11-13
1997-05-13
Gorgos, Kathryn L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204213, 204272, 204279, 204280, 204284, 204286, C25B 1102, C25C 702, C25D 1712
Patent
active
056288840
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a device for the electrolytic separation/deposition of metals with the aid of a rotating cathode system and a process for the operation of the device according to patent claim 1 or 10.
Electrolysis devices are known for the separation of metals from solutions, in which the electrodes are arranged as plates in packet-form. This causes often the observance of shorts or, due to faulty contacts, uncontrollable current densities occur (0.1-1 amp/dm.sup.2) that cause time and time again varying depositions. Furthermore, the flow conditions are difficult to control, resulting also in inhomogeneous depositions. In order to compensate for these disadvantages, lower current densities are employed that result in long deposition times and, therefore, become economically undesirable, or larger installations are employed, resulting in additional costs for the installation.
According to U.S. Pat. No. 5,183,544, a metal recovery system is known that allows the metal recovery from filter cakes. In a pretreatment, the metal-containing filter cake parts are brought into suspension and added to an electrolyte in which the metals are deposited onto a rotating cathode. This cathode is a nickel-covered or chrome-covered aluminum. It must every time be provided in a newly prepared form, which is disadvantageous. Furthermore, the cathode has to be worked up after completed deposition before it can be returned to the process.
It is the purpose of the present invention to disclose a device for the electrolytic deposition of metals and a process for its operation which provide a rotating cathode system that is of compact design and simple to operate, precipitates the metals compactly and homogeneously and, therefore, is particularly suitable for metal recovery.
According to the invention, this goal is achieved with a device according to the wording of patent claim 1, and a process according to the wording of patent claim 10. In claims 2-9 a form of execution for these is given. The invention is in the following described in more details on hand of the drawings.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 Principle of the rotating cathode system in an electrolysis unit in schematic depiction;
FIG. 2 Part of a support cylinder in section without contact rod;
FIG. 3 Part of a support cylinder in section after introduction of the contact rod;
FIG. 4 Example of form of execution of a contact chamber;
FIG. 5 Example of form of execution of a mantle cathode as a(n) continuous/endless hose.
FIG. 1 depicts the principle of the rotating cathode system in an electrolysis unit schematically. On a support/installation frame 1 is a container 2 situated that contains the electrolyte 3, and into which a cylindrical pipe 4 is welded. A drive shaft 5 is inserted through this pipe and supported by the bearings 6 and 6' and that is driven by an adjustable drive 7 with the aid of a gear belt 8 and at its upper end is equipped with a flange 9. The pipe extends above the level 16 of the electrolyte, whereby a run-off of the electrolyte is prevented. The electrolyses unit is fed with the electrolyte or respectively emptied through the inlet 17 or the overflow 18. Therefore, the device is also suitable for a cascade arrangement of several such units.
The drive shaft, here, e.g., constructed as a hollow shaft, conducts the current flow on the cathode side, for which a sliding body 10 is provided. The drive shaft requires a certain rigidity and--in case it is supposed to serve simultaneously as current feed--is manufactured from a metal alloy such as hard bronze or hard copper. If the drive shaft is designed as a hollow shaft, it is, e.g., made of stainless steel, which has a positive influence on the corrosion properties. The power feed 19 may then be handled by a copper conductor. Attached to flange 9 is a support cylinder 11 so that its cylinder walls 12 dip into the electrolyte. On the outside of the support cylinder a mantle cathode 20 is fastened, to which the current supply 19 occurs over a contact rod 30 with a socket 14, as is de
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Leudolph Jurgen
Roselt Frank
Gorgos Kathryn L.
Ingenieuburo und Labor Fur Galvanotechnik
Starsiak Jr. John S.
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