The possibility of selective solid-phase reduction of iron from oolitic ore has been experimentally confirmed. Solid phase reduction was carried out at temperatures of 850 and 1000°C in a CO atmosphere and in a mixture with solid carbon. Distribution of iron and phosphorus was investigated with a scanning electron microscope. It was found that at a temperature of 1000°C a minimum amount of phosphorus (up to 0.3%) is transformed into the metallic phase upon reduction with carbon monoxide. Upon reduction in a mixture of ore with carbon, the phosphorus content in the metal phase reaches 1.0–1.3% even at a temperature of 850°C. Thermodynamic modeling of the processes occurring during reductive roasting of oolitic ore was carried out depending on temperature (1000–1400 K) and amount of carbon in the system. It is shown that reduction temperature and degree of phosphorus reduction vary depending on the ratio of CO and CO2 in the gas phase. At temperatures below 892°C, phosphorus is not reduced, and all iron is in the metal phase. With an increase in the amount of carbon in the system, phosphorus appears in the metal phase. With an excess of carbon in the system, all phosphorus is in the metal phase at a temperature of 892°С. Thus, with a certain amount of carbon in the system and, correspondingly, with a certain ratio of CO and CO2 in the gas phase, selective reduction of iron is possible without phosphorus reduction even at a temperature of 1100°С. Comparison of experimental results with results of thermodynamic calculation confirms the possibility of selective reduction of iron without phosphorus reduction only by carbon monoxide.

中文翻译：

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从鲕粒中选择性还原铁和磷

从鲕粒矿石中选择性固相还原铁的可能性已被实验证实。固相还原在 850 和 1000°C 的温度下在 CO 气氛中和与固体碳的混合物中进行。用扫描电子显微镜研究铁和磷的分布。发现在 1000°C 的温度下，最少量的磷（最多 0.3%）在被一氧化碳还原后转化为金属相。在矿石与碳的混合物中还原后，即使在 850°C 的温度下，金属相中的磷含量也能达到 1.0-1.3%。根据温度 (1000–1400 K) 和系统中的碳含量，对鲕状矿石还原焙烧过程中发生的过程进行热力学建模。结果表明，还原温度和磷还原程度取决于气相中 CO 和 CO2 的比例。在低于 892°C 的温度下，磷不会被还原，所有的铁都处于金属相中。随着体系中碳量的增加，金属相中出现磷。由于系统中的碳过多，所有磷都在 892°С 的温度下处于金属相中。因此，如果系统中有一定量的碳，相应地，在气相中有一定比例的 CO 和 CO2 时，即使在 1100°С 的温度下，也可以选择性还原铁而不还原磷。实验结果与热力学计算结果的比较证实了仅通过一氧化碳还原铁而不还原磷的可能性。