Thermodynamic investigations and substantiation of the aluminothermic fabrication method of calcium
https://doi.org/10.17073/0021-3438-2015-6-15-22
Abstract
To search the ways of solving the problem on decreasing the prime cost of producing metallic calcium, it is proposed to consider its aluminothermic production by the example of the CaO–Al system. The thermodynamic analysis implemented for this system showed that the aluminothermic reduction of calcium from its oxide is technically performable under a pressure of 5–10 Pa and temperature of 1200–1500 °C. It is revealed that the implementation of reduction under the residual pressure lower than 1 atm (101,3 Pa) considerably lowers the thermodynamic temperatures of reaction beginning. It is established that only three reactions, in the course of which, calcium aluminates 3CaO·Al2O3, 5CaO·3Al2O3 (12CaO·7Al2O3), and CaO·Al2O3 are formed, can be used for practical purposes. It is proposed, depending on the final state, to separate the process into the «low-temperature» one (up to 1200 °C, the calcium yield is no higher than 64,3 %) and «high-temperature» one (up to 1500 °C, up to 75 % Ca). It is planned to further confirm these data experimentally.
About the Authors
V. K. Kulifeev
Dr. Sci. (Eng.), Prof., Department Non-ferrous Metals and Gold, National University of Science and Technology «MISIS» (117049, Russia, Moscow, Leninsky prospect, 4)
Russian Federation
Russian Federation
A. N. Kropachev
Национальный исследовательский технологический университет «МИСиС», г. Москва
Russian Federation
Cand. Sci. (Eng.), Prof., Department Non-ferrous Metals and Gold, NUST «MISIS»
Russian Federation
Cand. Sci. (Eng.), Prof., Department Non-ferrous Metals and Gold, NUST «MISIS»
V. P. Tarasov
Национальный исследовательский технологический университет «МИСиС», г. Москва
Russian Federation
Dr. Sci. (Eng.), Prof., Head of Department Non-ferrous Metals and Gold, NUST «MISIS»
Russian Federation
Dr. Sci. (Eng.), Prof., Head of Department Non-ferrous Metals and Gold, NUST «MISIS»
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Review
For citations:
Kulifeev V.K., Kropachev A.N., Tarasov V.P. Thermodynamic investigations and substantiation of the aluminothermic fabrication method of calcium. Izvestiya. Non-Ferrous Metallurgy. 2015;(6):15-22. (In Russ.) https://doi.org/10.17073/0021-3438-2015-6-15-22
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