C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 21/18 (2006.01)
Patent
CA 2168523
A method and a plant for regenerating sulfate electrolyte in steel strip galvanizing processes by precipitating dissolved iron from the iron cycle, wherein a partial quantity to be regenerated is removed from the cycle of the electrolyte and the iron dissolved in the partial quantity is oxidized to Fe3+ by a redox-controlled addition of oxidizing agents. Subsequently, by raising the pH value to the precipitation limit by a controlled addition of a ZnO/water suspension or a ZnCO3/water suspension, the dissolved iron is precipitated as sludge. Any excess ZnO or ZnCO3 is then dissolved by adding fresh electrolyte. The precipitated iron sludge is conducted through a suitable filter, such as, a filter press, a filter belt, a decanter, etc., and the precipitated iron is filtered out in this manner. Subsequently, the purified partial quantity of the electrolyte is returned into the cycle.
Glasker Ulrich
Kuhlmann Joachim
Riches Mckenzie & Herbert Llp
Sms Schloemann-Siemag Aktiengesellschaft
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