THERMODYNAMIC ANALYSIS OF PHASE DIAGRAMS BASED ON THE CONCEPT OF THE BJERRUM–GUGGENHEIM OSMOTIC COEFFICIENT
Baisanov S. Lu N. Zhinova Y. Narikbaeva G.
18 June 2024Technical University of Kosice
Acta Metallurgica Slovaca
2024#30Issue 277 - 89 pp.
The aim of this study is to theoretically confirm or refute the high degree of lead and zinc volatilization from the Shalkiya deposit (polymetallic refractory ores) using analyzing the phase diagrams and the behavior of the osmotic coefficient according to the Bjerrum-Guggenheim equation along the liquidus line for binary systems based on calcium. From the plots depicting the dependence of the Bjerrum-Guggenheim osmotic coefficient on activity, one can infer the structure of the melt (positive Ф_i <1 or negative Ф_i >1). That is, if the values of the Bjerrum-Guggenheim osmotic coefficient in a binary system indicate a positive character of interaction between the components, it implies interaction between like atoms in the melt, whereas negative values indicate interaction between unlike atoms, suggesting the formation of complex, high-temperature compounds, which would be undesirable in our case. The formation of complex high-temperature chemical compounds with impurity elements such as zinc and lead in the Fe-Si-Al-Ca-Mg-Zn-Pb system remains unresolved.
Bjerrum-Guggenheim osmotic coefficient , congruently melting compounds , lines of monovariant phase equilibria , phase diagrams
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Zh. Abishev Chemical-Metallurgical Institute, Ermekov st. 63, Karaganda, 100009, Kazakhstan
Zh. Abishev Chemical-Metallurgical Institute
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