[en] Full text: Much of current mineral processing relies on the use of appropriate sinters to hold the crushed ore in an open structure. The key bonding phases in iron ore sinter are frequently known by the terms SFCA and SFCA-I, which is shorthand for silico-ferrite of calcium and aluminium, with the latter being a higher iron composition. A typical SFCA iron ore may contain 60-76 wt% Fe₂O₃, 13-16 wt% CaO, 3-10 wt% SiO₂ and 4-10 wt% Al₂O₃. SFCA-I is a higher grade material with approximately 84 wt% of Fe₂O₃ at the expense of the silica and alumina. The structure of these sinters is, not surprisingly, very complex. For example, there are three different iron-calcium oxide phases as well as the brownmillerite phase which includes aluminium. In order to try and shed some light on the iron bonding we have taken room temperature Mössbauer spectra of 12 samples with differing compositions. However, the structure contains 11 distinct Fe or (Fe,Al) sites, and one may expect that many of them will be similar. Since the subspectra of each of the phases will be doublets, one is looking for up to 22 separate lines in spectra with very little resolution. Even when one can distinguish lines in the spectral envelope, it is not clear how to match them into doublets. We will describe the various approaches, mainly involving spectral subtraction techniques, which we have attempted in trying to analyze these spectra and get an interpretation in terms of the different iron coordinations and how they vary with change in composition. (author)