Untersuchung der Aussalz- bzw. Dehydratationswirkung des Kaliumhydroxids auf Kalium-eisen(II)-cyanidlösungen

摘要

The system K4Fe(CN)6/KOH/H2O was investigated by means of physico-chemical analysis. It was shown that at 30° and 40°C KOH has a strong salting out effect upon the solutions of K4Fe(CN)6, but the equilibrium solid phase is not dehydrated and remains K4Fe(CN)6·3H2O. In the isotherm at 60°C the solid phase remains K4Fe(CN)6·3H2O up to a concentration of 15 KOH. Beyond this concentration dehydration occurs and the solid phase represents K4Fe(CN)6. It was found that H4Fe(CN)6acid (in small concentrations) increases the solubility of K4Fe(