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I. Klimova Laboratory of Inorganic Materials, Faculty of Chemical and Materials Technology, Tallinn University of Technology, Tallinn, Estonia

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T. Kaljuvee Laboratory of Inorganic Materials, Faculty of Chemical and Materials Technology, Tallinn University of Technology, Tallinn, Estonia

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L. Türn Laboratory of Inorganic Materials, Faculty of Chemical and Materials Technology, Tallinn University of Technology, Tallinn, Estonia

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V. Bender Laboratory of Inorganic Materials, Faculty of Chemical and Materials Technology, Tallinn University of Technology, Tallinn, Estonia

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A. Trikkel Laboratory of Inorganic Materials, Faculty of Chemical and Materials Technology, Tallinn University of Technology, Tallinn, Estonia

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R. Kuusik Laboratory of Inorganic Materials, Faculty of Chemical and Materials Technology, Tallinn University of Technology, Tallinn, Estonia

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Abstract

In order to elucidate the influence of Ca and Mg carbonates with or without the presence of boron, manganese and copper compounds on the thermal stability of ammonium nitrate (AN), thermodynamic analysis of different reactions between AN and additives was carried out. Temperature dependency of Gibbs free energy changes ΔGT and equilibrium composition of reaction products were calculated for a set of reactions using the HSC software. Main solid compounds that can form in the systems of AN and carbonates, were Ca(NO3)2 and Mg(NO3)2, Ca(OH)2 and Mg(OH)2, CaO2 and MgO2, CaO and MgO, and N-containing gaseous compounds NO, N2O and NO2. As a result of H3BO3, MnO2 and CuSO4 addition, the content of CuO, Cu2O and MnO as solids and SO2, SO3 and HBO as gaseous reaction products reached the same level. Thereby, their equilibrium concentrations did not depend on the carbonate origin of CaCO3, MgCO3 or CaMg(CO3)2. Small amount of CuSO4, H3BO3 or MnO2 additive (0.01–0.05 mol) in the system, practically, did not influence the temperature dependencies of ΔGT of the reactions between AN and CaCO3 or CaMg(CO3)2. The influence of additives taken in the larger amount (0.5 mol) was evident and, depending on the additive and reaction, shifted their proceeding temperatures in either direction by more than 300–400 K.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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