NEW EXPERIMENTAL SULFOALUMINATE CLINKERS FROM NATURAL RAW MATERIAL MIXTURES
DOI:
https://doi.org/10.24193/subbchem.2018.1.06Keywords:
Sulfoaluminate belitic clinker, clinker chemistry, raw materials, transmission polarizing microscopy, XRD analysesAbstract
The paper presents new different raw materials mixtures which should lead to the theoretical mineralogical compositions of sulfoaluminate belitic (SAB) clinkers. The mixtures, composed of limestone, gypsum, clay, diatomite, basaltic scoria, volcanic tuff and red mud (bauxite ore processing by-product), have been burned at 1220, 1240 and 1260 °C for one hour in an electrical laboratory furnace, then quenched in fresh air. The resulted clinker samples were studied in thin sections under a polarizing petrographic microscope for clinker structure, microtexture and mineralogical association. The mineralogical assemblage assessment by XRD analyses was completed. The sample XRD patterns (processed by Match software and pdf2 database) have been allowed a qualitative and a semiquantitative estimation (external standard method) of the main mineralogical compounds: C2S (belite), C4AF (brownmillerite), CS̅ (anhydrite), C4A3S̅ (sulfoaluminate), proper for sulfoaluminate belitic clinkers. The identified minor and secondary mineral phases were: alkali (Na, K, Na- K) sulfates, natroalunite (NKA6 S̅ H), limeite (C), periclase (M), gehlenite (C2(A1-x,Mx)(AS)). The following abbreviations were used: C= CaO; S = SiO2; A= Al2O3; F= Fe2O3; S̅ = SO3; H = H2O; M= MgO; N(K)= Na2O(K2O).
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