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Planning, construction and testing of a demonstration electroplating facility for nickel- and chromium-plating with the complete recycling of nickel and chromium
- Bundesministerium für Bildung und Forschung (BMBF)
Fertigstellung des Projekts:
Fertigung / produzierende Unternehmen
Conventional electroplating installations generate substantial environmental pollution in the form of heavy metal emissions.
In consequence, the object of this project was the complete recovery of problematic heavy metals in a demonstration electroplating facility for nickel- and chromium plating and the extension of the electrolyte service life by the removal of harmful degradation products and the recirculation of the decontaminated electrolyte.
Trial operation commenced upon the completion of the overall installation. Following the completion of the project, the capacity of this facility has been fully exploited by means of two-shift operation.
- A process concept has been successfully developed for the complete recovery of nickel and chromium and the avoidance of nickel- and chromium-bearing hazardous wastes. Specifically, the reduced consumption of chromic acid for the fortification of the chromium electrolyte has also reduced the separation of metallic chromium from workpieces.
- A key element of this process technology has been the minimal use of rinsing water in all process stages. This has been achieved by the use of immersion rinsing cascades with timed spraying sequences, and by the recirculation of rinsing water in a three-stage treatment process.
- Increased investment expenditure should be considered in relation to the resulting savings in operating costs, which will ensure an attractive pay-back period.
- This demonstration facility will allow the evaluation of the principles of wastewater-free process management. The resulting findings can be applied to other technical fields (e.g. surface finishing).
Autor/Projektleiter: Mark Heinke
© cleaner production germany (Umweltbundesamt UBA)