Abstract
Several methods have been used for preparation of nickel and zinc ferrocyanides: precipitation, growth in a gel and a new method based on growth on a solid alkali-metal ferrocyanide. The granulometry, morphology, composition and structure of the compounds were studied. Only the last method of preparation gives products suitable for use as ion fixators in columns on a large scale. The nickel ferrocyanide compositions can be written as M I 2xNi 2− x Fe(CN) 6. yH 2O with M I Na, K, Cs, H and 0 < x < 0.8. They have a cubic lattice with a partial occupancy of iron sites. For zinc ferrocyanides, rhombohedral M I 2Zn 3[Fe(CN) 6] 2. xH 2O, trigonal Zn 2Fe(Cn) 6.2H 2O and other cubic compounds were found. Products resulting from the fixation of caesium by ion-exchange were also studied.
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