Thermodynamic Evaluation of Formation Conditions of Primary Clinker Minerals When Burning Dolomite-Containing Charge

On the basis of the analysis of literature sources, advantages and disadvantages of magnesium binders in comparison with Portland cement are presented. Among advantages are a low temperature of burning, better grindability, high strength, fast hardening, reducing the energy cost for heat treatment. The cost of magnesium cement production is approximately two times lower than the cost of Portland cement. The main disadvantage is a need for mixing not with water but with water solutions of salts. Scientific studies which conducted in the last years are devoted to the creation and improvement in properties of magnesium cements mixed with salt solutions. The theoretical analysis of possibility to obtain clinker minerals which are able to gain strength in interaction with water has been made. Changes in the enthalpy of chemical reactions of the formation of minerals are considered. It is established that reactions, products of which are belit, tricalcium aluminate, and calcium monoaluminate, are characterized by the greatest thermodynamic probability. The comparative analysis of proceeding of reactions among mineral components and at addition of an organic component in the raw mixture is made. It is shown that the presence of organics in the raw mixture contributes to increasing the thermodynamic probability of proceeding of chemical reactions.

V.I. VINNICHENKO¹ , Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.N. RYAZANOV² , Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.Yu. VITSENKO³ , Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Kharkiv National University of Construction and Architecture (40, Sumskaya Street, Kharkov, 61002, Ukraine)
² Ufa State Petroleum Technological University (1, Kosmonavtov Street, Republic of Bashkortostan, Ufa, 450062, Russian Federation)
³ Prydniprovs’ka State Academy of Civil Engineering and Architecture (24a, Chernyshevskogo Street, Dnipropetrovsk, 49600, Ukraine)

1. Duda Walter H. Cement-Data-Book. Wiesbaden: Bauverlag. 1977, pp. 363–365.
2. Zyryanova V.N., Berdov G. I., Tyuleneva N. I. Composite magnesia binders. Current problems in construction and architecture. Education. The science. Practice: Proceedings of the All-Russian Scientific and Technical Conference. Samara. 2007. 189 p.
3. Shabanova G.N., Taranenkova V.V., Smal G.L., Kuzmenkov E.D. Study of hydration products based on magnesia binder caustic dolomite. Vestnik NTU “KPI”. 2012. No. 32. pp. 184–188. (In Ukraine).
4. Shabanova G.N. Highly magnesial binders based on domestic raw materials. Collection of scientific works. Vol. 138. Kharkov: UkrGAZhT. 2013. pp. 148–154. (In Ukraine).
5. Borisov I.N., Vinnichenko V.I., Ryazanov A.N. Energyefficient building materials on the basis of dolomite and coal waste. Energy-saving technological systems and equipment for the production of building materials. Interuniversity collection of articles BSTU named after V.G. Shukhov. 2013. Vol. XII, pp. 98–107. (In Russian).
6. Plugin A.A., Vinnichenko V.I., Borzyak O.S., Ryazanov A.N. Dolomite cement, water soluble. Collection of scientific works. 2014. Vol. 143. Kharkov: UkrGAZhT, pp. 87–97. (In Ukraine).
7. Ryazanov A.N., Vinnichenko V.I., Plugin A.A. Theoretical substantiation of complex use of dolomite and coal waste to produce building materials. Collection of scientific works. 2013. Vol. 138. Kharkov: UkrGAZhT, pp. 77–85. (In Ukraine).
8. Sorel S. Improved composition to be used as a cement and as a plastic material for molding various articles. United States Patent Office. Patent 53/092. 6 March 1866. Paris. France.
9. Baykov A.A. Caustic magnesite, its properties and solidification. Zhurnal russkogo metallurgicheskogo obshchestva. 1913. No. 1, p. 207. (In Russian).
10. De Wolff P.M., Walter–Levy M.L. Hydratations prozesse und Erhartungs eigenschaften in Systemen MgO–MgCl2. Zement-Kalk-Gips. 1953. No. 4, pp. 125–137.
11. Kasai J., Ichiba M., Nakanara M. Mechanism of the hydration of magnesia cement. Bulletin of the Chemical Society of Japan. 1956. Vol. 63. No. 7, pp. 1182–1184.
12. Volzhenskiy A.B. Mineralnyye vyazhushchiye veshchestva [Mineral binders]. Moscow: Stroyizdat. 1986. 464 p.
13. Mazuranic C., Biliuski. H., Matcovic B. Magnesium oxychloride cementobtained from partially calcined dolomite. Journal of the American Ceramic Society. 1982. Vol. 65. No. 10, pp. 523–526.
14. Babushkin V.I., Matveyev G.M., Mchedlov-Petrosyan O.P. Termodinamika silikatov [Thermodynamics of silicates]. Moscow: Gosstroyizdat. 1965. 352 p.
15. Glushko V.P. Termicheskiye konstanty veshchestv. Spravochnik v desyati vypuskakh. Vypusk IV (S. Si. Ge. Sn. Pb). Chast І – Tablitsy prinyatykh znacheniy [Thermal constants of substances. Directory in ten editions. Edition IV (C, Si, Ge, Sn, Pb). Part I – Tables of accepted values]. Moscow: VINITI. 1970. 510 p.
16. Landiya N.A. Raschet vysokotemperaturnykh teployemkostey tverdykh neorganicheskikh veshchestv po standartnoy entropii [Calculation of high-temperature heat capacities of solid inorganic substances at the standard entropy]. Tbilisi: Univ. Academy of Sciences of the Georgian SSR. 1962. 223 p.
17. Naumov G.B., Ryzhenko B.N., Khodakovskiy I.L. Spravochnik termodinamicheskikh velichin (dlya geologov) [Handbook of thermodynamic quantities (geologists)]. Moscow: Atomizdat. 1971. 240 p.