Abstract The calcination of oxygen carrier is the essential step prior to its application in chemical looping combustion, which is significantly influenced by calcination conditions. In this study, a natural iron ore was treated under the combined effect of three key calcination parameters (heating rate, temperature, and duration time). The reactivity performance of calcined iron ores was evaluated with CO as fuel, and the iron ore with the best performance and the parameter with the greatest impact were screened. The results showed that the iron ores treated under different calcination conditions showed evident difference in their reactivity, in which calcination temperature showed the biggest impact on the physicochemical properties of fresh iron ore. The best calcined iron ore was obtained under the heating rate of 15 °C/min, the temperature of 1050 °C, and the duration time of 60 min within the selection limits of three calcination parameters, and its cyclic test showed that the maintained good physical structure of best calcined iron ore guaranteed it against the reactivity decay, a stable recyclability performance was achieved during the consecutive redox cycles. The findings in this study could provide a reference for the further optimization of calcination parameters suitable for commercial oxygen carriers.

中文翻译：

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煅烧条件对铁矿石化学链燃烧性能的影响

摘要 氧载体的煅烧是其应用于化学循环燃烧前的必要步骤，其煅烧条件受煅烧条件影响较大。在本研究中，在三个关键煅烧参数（加热速率、温度和持续时间）的共同作用下处理天然铁矿石。以CO为燃料评价煅烧铁矿石的反应性能，筛选出性能最好和影响最大的参数。结果表明，不同煅烧条件下处理的铁矿石反应活性存在明显差异，其中煅烧温度对生铁矿理化性质的影响最大。在15℃/min的升温速率下得到最好的煅烧铁矿石，在三个煅烧参数的选择范围内，温度为1050°C，持续时间为60分钟，其循环试验表明，最佳煅烧铁矿石保持良好的物理结构，保证了其不发生反应性衰减，稳定的可回收性能在连续的氧化还原循环中实现。本研究结果可为进一步优化适用于商业载氧体的煅烧参数提供参考。