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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.
Through the in situ observation, the evolution of the phase structure and the effect of temperature on the precipitation of Fe were investigated in the H2 atmosphere, the reduction process of high-phosphate rock at different temperatures, and the oolite structure of the high-phosphate rock was not destroyed during the reduction With the increase of temperature, the evolution of the structure of the mineral phase is accelerated, Fe is obviously segregated when the temperature is higher, and the metallic iron accelerates from the hematite phase. The reduction temperature has a significant effect on the precipitation form of the metallic iron in the high-phosphate rock : At 700 ℃, metallic iron precipitated on the surface of the ore particles to form dense iron layer. The morphology of metallic iron precipitated at 800 ℃ was complicated, the densification of the iron layer was decreased, cavities appeared and a small amount of short iron whiskers appeared at 900 ℃ The quantity of iron whiskers increased obviously, accompanied by the precipitation of a large amount of porous sponge iron, therefore, the reduction process of the gas-based reduction process could be avoided by avoiding the reduction of temperature and time, and the high phosphate rock could be efficiently reduced.