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Development and testing of a process technique for the regeneration of electroplated electrolytes – industrial framework
- Bundesministerium für Bildung und Forschung (BMBF)
Fertigstellung des Projekts:
Fertigung / produzierende Unternehmen
The service life of galvanic electrolytes is limited by the concentration of organic foreign substances. The removal of such substances is currently associated with high losses of matter and waste water pollution; a method of process control which produces a low quantity of waste products is not possible therefore.
By using regenerative adsorber polymers, these interfering substances are to be removed from the galvanizing electrolytes without causing any considerable losses. With a method of process control which is low in waste products and free of waste water, a practically unlimited service life of the electrolytes is thus achieved.
- The method was tested on nickel electrolytes under practical conditions. In the process, it was proven that an extensive, selective removal of organic foreign substances is possible. The adsorption capacities attainable are dependent upon the feed concentration. For designing plants, selecting the adsorber polymers and deciding on the regenerating technology, it is essential that aptitude tests be carried out on the electrolytes to be regenerated.
- The regeneration of the polymers was carried out by means of purely inorganic chemicals in two stages: anoxydizing with H2O2 (hydrogen peroxide) or S2O8 (peroxodisulphate) and regenerating with NaOH (sodium hydroxide). The multiple utilization of the regenerants was able to be proven, dependent upon the electrolytes. The tests led to the development of a plant prototype in four stages of performance.
- The adsorption method provides a regenerator which enables the material cycle to be closed in the case of process solutions containing organics. Applying the method to other process solutions containing organics (e.g. the cleaning of waste hydrochloric acid) is conceivable.
Autor/Projektleiter: Bernd Fenk
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