...Mark I. POWNCEBY; Tim R.C. PATRICK Abstract Quenching experiments have been performed to investigate the thermal stability, solid solution limits, and selected phase relationships of SFC (silico-ferrite of calcium) within the Fe 2 O 3 -CaO-SiO 2 (FCS) system. Experiments were performed in air over...

... Barioferrite BaFe 12 O 19 “Superferrite” (Ca,Mg,Mn)Fe 6 O 10 “Grandiferrite” (Ca,Mn 2+ ,Mg)(Fe,Mn 3+ ) 4 O 7 Harmunite (aciculite) CaFe 2 O 4 “Dorrite phase” Ca 2 (Fe 3+ 5 Mn 3+ 0.5 Mg 0.5 )(Si 0.5 Fe 3+ 5.5 )O 20 “Ca-silico-ferrite” Ca 4 Fe 3 + 14 (Mg,Mn) 2 Si 2 O 31...

.... Iliev M.N. Popov V.N. Gospodinov M. ( 2003 ): Temperature-dependent polarized Raman spectra of CaFe 2 O 4 . Solid State Commun. , 128 , 153 – 155 . Liles D.C. de Villiers J.P.R. Kahlenberg V. ( 2016 ): Refinement of iron ore sinter phases: a silico-ferrite of calcium...

...). Such elongated tsangpoite crystals frequently contain a central tube filled with opaque minerals of FeS + Mag ± ferrite (bcc Fe) ± Fe–S–O phases ( Fig. 1 c ), as confirmed by electron imaging and diffraction (not shown). By contrast, because of the lower abundance and smaller sizes, it was more difficult...

... I.C. Christensen A.N. ( 2004 ): Reaction sequences in the formation of silico-ferrites of calcium and aluminum in iron ore sinter . Metall Mater. Trans. B. , 35B , 929 – 936 . Sharygin V.V. ( 2011 ): Lakargiite and minerals of the perovskite-brownmillerite series...

... ). The process of a complete hydrolytic decomposition of a silico-magnesian rock (less ferriferous and poorly aluminous) has led to the formation of a ferruginous material. The lower clay horizon (limonite) that overlies the weathered rock (saprolite) stands out as the most ferruginous level (54 to 75 wt.% Fe 2...

... and can easily be adapted for process control. Minerals typically present in the sinters are magnetite, hematite, magnesioferrite, periclase, di-calcium silicate, glass and silico ferrites of calcium and aluminium. The latter phases are abbreviated as SFCA, of which three varieties have been described...

... the analysis in the field. Reactive silica was measured by means of the colorimetric method involving the silico-molybdate complex (yellow form) using a portable colorimeter. Samples for the analysis of major anions, major cations, and minor dissolved constituents were filtered in situ through a membrane...

... at BE = 74.2 eV with no evident asymmetries in the peak shape ( Figure 2 ). The peak BE is close to values obtained by Hasha et al. (1988) for silico-aluminophosphates with Al in tetrahedral coordination (BE Al 2p values range from 74.2 to 75.3 eV), thus suggesting that in Fe-bearing phlogopite, Al...

... fluxes (CaO, CaF 2 ) added to the alumina and iron oxide used in the reduction process. Absent from all slags investigated are Fe-bearing compounds. All of the slags are modally-dominated by prismatic crystals of β-alumina or hibonite, with a wide variety of Th-Ba-Ti-Nb-Al-oxide compounds and silico...

...(Fe,Mn) 4 (PO 4 ) 3 ] DA galileiite A rare phase in iron meteorites 57 Tsangpoite [Ca 5 (PO 4 ) 2 (SiO 4 )] DA tsangpoite A rare silico-phosphate from the D’Orbigny angrite 54 Oxides Oxide Spinel Group [(Mg,Fe 2+ )(Al,Fe 3+ ,Cr 3+ ,Ti) 2 O 4 ] Chromite (Fe 2+ Cr 2 O 4 ) DA...

... for determining these parameters ( Putnis 1992 ). For example by looking at a borosilicate glass composition with around 4 mol% of Nd 2 O 3 (a good candidate to simulate nuclear waste encapsulation material) such crystallization can be observed directly by doing HT in situ experiments. Some silico-apatite (Ca...

... the process, whereas another part may behave refractory and be retained in the clinker product. The incorporation of alkalis in main clinker minerals alite (C3S), belite (C2S), and ferrite (C4AF) is very limited. Only main clinker constituent aluminate (C3A) is able to host up to 5.7 wt% of Na 2 O replacing...