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中文摘要：
采用JSM-5600LV型扫描电镜和FEI-Sirion200场发射扫描电子显微镜分析高铁锰矿矿石性质结构,并对高铁锰矿直接还原进行研究。实验结果表明：赤铁矿和少量褐铁矿呈粒状（1-2μm）不均匀分布于板状的方铁锰矿中,其中49.53%（质量分数）的锰与铁氧化物以类质同象存在。热力学研究表明：在还原过程中,铁和锰的氧化物还原遵循逐级还原的原则,同时,锰的高价氧化物优先还原。通过SEM图分析可知,随着还原温度的升高,高铁锰矿在还原过程中,金属铁颗粒不断迁移、聚集、兼并长大,采用无烟煤在1 100℃还原,100 min时,铁氧化物中81.03%（质量分数）的铁还原成金属铁,金属铁中局部仍存在MnO。
英文摘要：
The structure properties of a high iron content manganese ore were examined by applying SEM with EDAX analysis. Reduction behavior and mechanism were also investigated. The results show that granular hematite and a small amount of limonite （1-2 μm） distribute unevenly in laminar bixbyite. And 49.53% （mass fraction） of manganese exists in iron mineral isomorphously. Reduction of manganese oxide and iron oxide both proceed sequentially and the reduction of high valent manganese oxide is prior to that of iron oxide. Iron particles transfer and conglomerate with the rise of temperature. When the manganese ore is reduced at 1 100℃ for 100 min, 81.03% （mass fraction） of the total iron reduces to metallic iron and MnO can still be found partially in iron phase.
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