Study of the reaction between dolomite and nitric acid

• Autorzy: Pultar Martin , Vidensky Jan , Sedlarova Ivona

Identyfikatory

DOI

10.5277/ppmp18140

• Języki publikacji: EN

Abstrakty

EN

This paper is focused on the kinetics of the reaction between natural dolomite and diluted solutions of nitric acid at various temperatures. All experiments were carried out in a semi-batch reactor with an approximately constant nitric acid concentration using the pH-stat titration method. The reaction was studied in the temperature range from 293 to 353 K and the nitric acid concentration in the range from 0.001 to 0.200 mol dm-3. The strong effects of both temperature and nitric acid concentration were observed. The determined fractional values of the apparent reaction order (0.39 to 0.75) indicate a very complex reaction mechanism. In the studied concentration range, the values of the apparent activation energy increase from 30 to 58 kJ mol-1. Based on these data it can be assumed that the reaction takes place in the transitional regime with the stronger influence of chemical reaction. This assumption was verified by calculation of the nitric acid concentration on the surface of the dolomite grain using Sherwood criterion equation. The change in the role of the rate-controlling step was found for highly diluted solutions (< 0.010 mol dm-3 HNO3).

Słowa kluczowe

EN

dolomite; nitric acid; kinetics; dissolution; shrinking core model

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 2
• Strony: 370--379
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Pultar Martin

• Department of Inorganic Technology, University of Chemistry and Technology, Technicka 5, 166 28 Prague 6

autor

Vidensky Jan

• Department of Inorganic Technology, University of Chemistry and Technology, Technicka 5, 166 28 Prague 6

autor

Sedlarova Ivona

• Department of Inorganic Technology, University of Chemistry and Technology, Technicka 5, 166 28 Prague 6

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).