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Identification of a Crystalline Cyanide-Containing Compound in Blast Furnace Sludge Deposits

^a Arbeitsgruppe Bodenkunde und Bodenökologie, Fakultät für Geowissenschaften, Ruhr-Universität Bochum, D-44780 Bochum, Germany
^b Institut für Mineralogie und Lagerstättenkunde, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany

View larger version (13K): [in a new window]   Fig. 1. Powder X-ray diffraction patterns of synthetic potassium zinc hexacyanoferrate(II) nonahydrate, K2Zn3[Fe(CN)6]2 x 9H2O, where CN is cyanide. The strongest peaks are marked with corresponding d spacings in nm.

View larger version (24K): [in a new window]   Fig. 2. Powder X-ray diffraction patterns of synthetic potassium zinc hexacyanoferrate(II) nonahydrate, K2Zn3[Fe(CN)6]2 x 9H2O, where CN is cyanide, and three blast furnace sludge samples from different locations. Note that the intensity scaling factor is 0.66 for the synthetic potassium zinc hexacyanoferrate(II) nonahydrate whereas it is 4 for Samples 2076 and 2128 and 10 for Sample 2153. Relevant peaks are marked with corresponding d spacings in nm. Cyanide contents are 9280 mg kg-1 CN for Sample 2076; 3230 mg kg-1 CN for Sample 2128; and 6760 mg kg-1 CN for Sample 2153.

View larger version (30K): [in a new window]   Fig. 3. Powder X-ray diffraction patterns of synthetic potassium zinc hexacyanoferrate(II) nonahydrate, K2Zn3[Fe(CN)6]2 x 9H2O (the intensity scaling factor is 0.1 and CN is cyanide), and five blast furnace sludge samples before and after a treatment with a NaOH solution. Some peaks are marked with corresponding d spacings in nm.