Viscivity of the B2O3-CaO-NiO (FeO) systems melts
2019; Volume: 59; Issue: 7 Linguagem: Inglês
10.37952/roi-jbc-01/19-59-7-104
ISSN2074-0212
AutoresА. С. Вусихис, Leopold Leontiev, Е. Н. Селиванов, Viktor P. Chentsov, Valery V. Ryabov,
Tópico(s)Metal Extraction and Bioleaching
ResumoStructure of the B2O3 melt was analyzed as well as CaO modifier additives (25, 34, and 45 mass %) effect to it. As was proved, non-ring groups of associated rings proper to pure B2O3 are transformed into BO2O – metaborate triangles. The released oxide ions increase the coordination number of modifying ions, which occupy cationic vacancies place in the most disordered part of the melt greed. The B2O3–CaO–NiO and B2O3–CaO–FeO melts viscosity were measured by the method of vibration viscometry. Ratio of Boron to Calcium oxide mass fractions was taken as 3/1 and content of Nickel and Iron oxides in the range up to 5 and 20 % mass respectively. The experiments had been carried out using vibration viscometer operating in the mode of forced oscillations. The melt temperature was measured by Platinum –Platinum – Rhodium thermocouple. The measurements were carried out in cooling mode of the melt from 1800 K at 7-10 K/min speed. The viscosity temperature dependencies as well as its dependence on Nickel and Iron oxides were determined. Data processing was performed using the Table curve application software. Viscosity experimental data of the B2O3-CaO-NiO system melts for 1373, 1423, 1473, 1523, 1573 K temperatures have been described by the equation: η = a + b·exp(-cx), and for B2O3 – CaO – FeO melts by equation: η = a + b·x2 + c·exp (x) + d·exp(-x). Experimental data and calculations results show good convergence. The results are supposed to be used for describing the kinetics of metal reduction in bubbling processes, accompanied by the concentrations change of the oxides under reduction. The obtained information is useful for correction the slag melts properties in non-ferrous metal production.
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