Abstract 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.

中文翻译：

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硫酸与钛铁矿反应的热效应受初始温度和酸浓度的影响

摘要 测定了挪威和澳大利亚钛铁矿与硫酸反应过程中温度和硫酸浓度对焓和放热速率的影响。将量热测量获得的实验结果与基于氧化物组成和原料相组成的理论计算结果进行了比较。挪威钛铁矿 (900-940 kJ/kg) 和澳大利亚钛铁矿 (800-840 kJ/kg) 的实验测定反应热与基于原材料相组成的理论计算结果非常吻合。发现钛铁矿分解反应的焓不依赖于83%~93%浓度范围内的硫酸浓度。