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Metal Science and Metallography
ArticleName The method of mathematical description of the phase composition diagrams
DOI 10.17580/cisisr.2023.01.13
ArticleAuthor A. A. Akberdin, A. S. Kim, R. B. Sultangaziev, A. S. Orlov
ArticleAuthorData

Chemical and Metallurgical Institute named after Zh. Abishev (Karaganda, Kazakhstan):

A. A. Akberdin, Dr. Eng., Prof., Head of the Bor laboratory
A. S. Kim, Dr. Eng., Chief Researcher of the Bor laboratory
R. B. Sultangaziev, Dr. Eng., Senior Researcher of the Bor laboratory
A. S. Orlov, Dr. Eng., Senior Researcher of the Bor laboratory, e-mail: wolftailer@mail.ru

Abstract

The method for the mathematical description of phase composition diagrams has been developed. It is based on the balance of distribution of the initial components of the slag or metal over the secondary compounds (phases) formed from them. The equations relating the phase composition to the chemical one are obtained, and a computer program is created on their basis. After setting the chemical composition of the slag from the console and starting it, the computer outputs the phase composition in mass percent, the number of the polytope, its volume, initial and final equations. The method has no restrictions on the number of components considered in the system under study and allows describing five or more component systems that cannot be correctly displayed in three-dimensional space on a plane. Examples of using the model are given. Calculations using the obtained model established that deterioration in the production of carbonaceous ferrochromium from Kazakh ores is due to the movement of slags within the SiO2 – Al2O3 – MgO triple diagram from the region of magnesia spinel (MgO·Al2O3) to the region of predominant forsterite crystallization (2MgO·SiO2) during transition to use of magnesia ores. A predictive estimation of the phase composition of steel-smelting slags with high basicity is given. It was found out that, on average, they contain high-temperature compounds such as periclase (MgO), dicalcium silicate (Ca2SiO4), calcium monoaluminate (CaAl2O4), and magnesia spinel (MgAl2O4) as phase components. All of them are high-temperature compounds, which determine refractoriness of the slag. Presence of Ca2SiO4 in the slag in a large amount (74 %), capable of polymorphic transformation with a volume change by 12 %, can cause decomposition of slags with formation of dispersed dust, which is hazardous to the environment. The calculation results are confirmed by X-ray phase analysis of the slag. The proposed mathematical model also allows solving inverse problems, i.e. to find the composition of the charge to obtain a product with the desired phase composition. It is recommended to load charge containing 68.48 % CaO, 25.10 % SiO2 and 6.43 % Al2O3 into the kiln to obtain high quality white Portland cement clinker with the following composition: 45 % of 3CaO·SiO2, 38 % of 2CaO·SiO2 and 17 % of 3CaO·Al2O3.

The work was carried out within the framework of program-targeted funding of the Scientific and Technical Proceedings Program “Creation of new composite materials with high performance properties based on rare and rare earth elements” of the Industrial Development Committee of the Ministry of Industry and Infrastructure Development of the Republic of Kazakhstan.

keywords Slag, oxides, metal, elements, phase, diagram, oxide distribution, mathematical model, computer program
References

1. Chaikin A. V. Scientific grounds of innovative technologies for furnace processing and ladle treatment of iron and steel for special purpose castings. Saint-Petersburg : Naukoemkie tekhnologii. 2022. 245 p.
2. Kachalov G. S. Phase equilibriums in silicate systems. A manual. Tyumen : TIU. 2017. 75 p.
3. Kurnoskin I. A., Krylova S. E. Management on structure and properties of castings from chromium cast iron via alloying, modifying, heat treatment. Proceedings of the X All-Russian Conference “Computer integration of production and IPI-Technologies». Orenburg, November 18-19, 2021. pp. 505-508.
4. Chen Z.L., Chen J., Lin W.M. First-principles calculation of electronic structure and microwave dielectric properties of Fedoped o-Cr7C3. Computational materials science. 2014. Vol. 83. pp. 293-302.
5. Cui W.T., Feng J., Tian L. Study on Contact Fatigue Crack Propagation Behavior of Cr7C3 Coatings. International Conference on Advances in Materials, Machinery, Electrical Engineering (AMMEE). 2017. Vol. 114. pp. 804-811.
6. Malysheva T. Ya., Dolitskaya O. A. Petrography and mineralogy of iron ore raw materials. A manual for universities. Moscow : MISiS. 2004. 424 p.
7. Udalov Yu. P. Use of software complexes of calculating and geometric thermodynamics in designing of technological processes for inorganic substances. A manual. St. Petersburg. St. Petersburg state technological institute (Technical university). 2012. 147 p.
8. Konadu D. S., Pistorius P. H. Investigation of formation of precipitates and solidification temperatures of ferritic stainless steels using differential scanning calorimetry and Thermo-Calc simulation. Sadhana-academy proceedings in engineering sciences. 2021. Vol. 46. No. 3. pp. 161-167.
9. Salina V. A. Zhuchkov V. I., Zayakin O. V. Thermodynamic simulation of silico-thermal process of nickel and iron reduction from oxides. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii. 2020. Vol. 76. No. 4. pp. 365-371.
10. Ilyinykh N. I., Kovalev L. E. Thermodynamic simulation of of Zn-S and Zn-Se systems. Rasplavy. 2020. No. 6. pp. 636-647.
11. Konar B., Hudon P., Jung, I. H. Coupled experimental phase diagram study and thermodynamic modeling of the Li2O-Na2O-SiO2 system. Journal of the European ceramic society. 2018. Vol. 38. No. 4. pp. 2074-2089.
12. Kim S. V., Bogoyavlenskaya O. A., Kudarinov S. K., Orlov A. S., Orlova V. V. Prospects for production of smokeless fuel briquettes from coal from open pit mines in Kazakhstan. Mining Informational and Analytical Bulletin. 2020. Vol. 79. pp. 147-158.
13. Heath D. L. Mathematical treatment of multicomponent system. J. Amer. Ceram. Soc. 1957. Vol. 40. No. 2. p. 50.
14. Shabanova G. N., Logvinkov S. M., Korogodskaya A. N., Khristich E. V., Ivashchenko M. Yu., Kostyrkin O. V. Bariumcontaining refractory materials for special purpose. Kharkov : NTU “KhPI”. 2018. 291 p.
15. Akberdin A. A., Kim A. S., Esenzhulov A. B., Sarekenov K. Z. Putting into practice the technology for stabilization from silicate decomposition of the main metallurgical slags. Theory and practice of ironmaking. Proceedings of the international scientific and practical conference devoted to 70th anniversary of KGGMK “Krivorozhstal”. Krivoy Rog. 2004. pp. 295-297.

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