Analysis of raw mixture composition as a factor of increase of portland cement clinker whiteness

Authors

DOI:

https://doi.org/10.15587/1729-4061.2016.82860

Keywords:

white Portland cement, combined method, clinker, raw mixture, kaolin, chemical composition, dispersion/dispersed system, coagulated structure, crystalline phase, cement whiteness

Abstract

The newly developed compositions of raw mixtures for clinker production contain minimized amounts of coloring oxides and are controlled by a specially designed computer program CLINKER. The study used various types of enriched carbonate, aluminum- and silica-containing raw materials from different parts of Ukraine to reveal the peculiarities of coagulated structures and phase transformations of dispersions. It has proved that control of the parameters of coagulated structures of slurry dispersions (such as viscosity, fluidity, and kinetic stability) is essential for optimizing raw mixture compositions for wet and combined production of white Portland cement. We have assessed the effect of mineralizing additives necessary to intensify clinker sintering on the characteristics of the slurry coagulated structure and identified the peculiarities of clinker minerals С3S, C2S, C3A, C4AF, and C12A7 that are formed in burning the novel raw mixtures. In addition, we have proved that optical and physical properties of crystalline phases are related to clinker whiteness and traced how burning raw mixtures based on the oxide system CaO–Al2O3–SiO2 results in crystalline phases with a relatively lower refractive index of the optically isotropic and transparent mayenyte C12A7 (Ng=2.85–2.90) as a factor of increasing clinker whiteness. The supplied example shows how to obtain clinker with increased whiteness (80–83 %) by intensifying the synthesis of C12A7, C2AS, and C3A.

Author Biographies

Nataliia Dorogan, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnical Institute» Peremogy ave., 37, Kyiv, Ukraine, 03056

PhD, Assistant

Department of Chemical Technology of composite materials, 

Lev Cherniak, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnical Institute» Peremogy ave., 37, Kyiv, Ukraine, 03056

Doctor of Technical Science, Professor

Department of Chemical Technology of composite materials

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Published

2016-12-20

How to Cite

Dorogan, N., & Cherniak, L. (2016). Analysis of raw mixture composition as a factor of increase of portland cement clinker whiteness. Eastern-European Journal of Enterprise Technologies, 6(6 (84), 43–49. https://doi.org/10.15587/1729-4061.2016.82860

Issue

Vol. 6 No. 6 (84) (2016): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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