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Content available The influence of sulfur addition on the hazard-type reaction of ilmenite ores with sulfuric acid
Jabłoński Maciej, Lubkowski Krzysztof, Tylutka Sandra, Ściążko Andrzej
Polish Journal of Chemical Technology
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2021
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Vol. 23, nr 3
17--23
EN
The paper presents results of thermokinetic investigation of the hazard-type reaction of Norwegian and Australian ilmenite ores with sulfuric acid, modified by the addition of elemental sulfur, to increase the process safety in industrial conditions. In the reactions of both ilmenite ores the addition of sulfur caused a reduction of the thermal power generated in the reaction and a decrease in the value of the thermokinetic parameter ΔTmax/Δτ for almost the whole range of initial concentrations of sulfuric acid. It was also found that the addition of sulfur to the reaction did not negatively affect the degree of ilmenite leaching. The interpretation of the obtained thermokinetic curves allowed to determine safe process conditions for both types of titanium raw materials.
2
Content available Heat effects in the reaction of sulfuric acid with ilmenites influenced by initial temperature and acid concentration
Jabłoński Maciej, Lubkowski Krzysztof, Tylutka Sandra, Ściążko Andrzej
Polish Journal of Chemical Technology
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2021
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Vol. 23, nr 3
37--42
EN
The influence of temperature and sulfuric acid concentration on the enthalpy and the rate of heat release during the reaction of Norwegian and Australian ilmenites with sulfuric acid was determined. The experimental results obtained from calorimetric measurements were compared with theoretical calculations based on the oxide composition and the phase composition of the raw material. Experimentally determined heat of reaction for Norwegian ilmenite (900–940 kJ/kg) and Australian ilmenite (800–840 kJ/kg) showed good agreement with theoretical calculations based on the phase composition of the raw material. It was found that the enthalpy of ilmenites decomposition reaction does not depend on the concentration of sulfuric acid in the concentration range from 83% to 93%. It was also demonstrated that the temperature and concentration of sulfuric acid have a significant impact on the thermokinetics of the decomposition process, increasing the value of the average rate of temperature change.
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