CAJ | 학술논문

通过原位观察的方法，研究了H2气氛、不同温度下高磷矿还原过程的矿相结构演变规律和温度对金属铁析出形态的影响。高磷矿的鲕状结构在还原过程中未被破坏掉；随着温度的提高，矿相结构的演变加快，温度较高时Fe发生明显偏聚，金属铁从赤铁矿相中加快析出。还原温度对高磷矿中金属铁的析出形态影响显著：在700℃时金属铁析出在矿石颗粒表面形成致密铁层；800℃时析出的金属铁形貌复杂化，铁层致密度下降，出现孔洞，同时有少量的短小铁晶须；900℃时铁晶须数量明显增多，同时伴随着大量多孔海绵铁的析出。因此，可以通过调节还原温度和时间，使得气基还原过程避免黏结失流，同时高效还原高磷矿。
통과원위관찰적방법，연구료H2기분、불동온도하고린광환원과정적광상결구연변규률화온도대금속철석출형태적영향。고린광적이상결구재환원과정중미피파배도；수착온도적제고，광상결구적연변가쾌，온도교고시Fe발생명현편취，금속철종적철광상중가쾌석출。환원온도대고린광중금속철적석출형태영향현저：재700℃시금속철석출재광석과립표면형성치밀철층；800℃시석출적금속철형모복잡화，철층치밀도하강，출현공동，동시유소량적단소철정수；900℃시철정수수량명현증다，동시반수착대량다공해면철적석출。인차，가이통과조절환원온도화시간，사득기기환원과정피면점결실류，동시고효환원고린광。
Based on in-situ observation, mineral evolution in high-phosphorous iron ore during the reduction process was investi-gated in the H2 atmosphere at different temperatures, and the influence of temperature on the morphology of iron was discussed. During the reduction process, ooliths in the iron ore remain. The mineral phases evolve faster with rising temperature, and so does the precip-itation of iron from hematite phase. Significant segregation of iron happens at a higher temperature. Temperature has significant impact on the precipitation morphology of metallic iron. At 700℃, the precipitation of metallic iron forms a dense layer on the surface of particles. At 800℃, the precipitation morphology of metallic iron is complex, the density of the iron layer decreases, little holes appear while a small number of short iron whiskers are found. But at 900℃, the number of iron whiskers significantly increases with abundant porous sponge iron. Therefore, by adjusting the temperature and time, the sticking problem during the gas-based reduction process can be avoided, and meanwhile, efficient reduction of high phosphate iron ore is achieved.