稀土在烧结过程中的行为与机理研究

Study on Behavior and Mechanism of Rare Earth in Sintering Process

采用烧结杯系统研究了稀土对烧结矿质量、冶金性能以及矿物组成的影响,并结合扫描电镜和能谱分析了稀土在烧结矿不同矿物中的赋存状态。研究结果表明:随着稀土配比的增加,烧结成品率、利用系数以及转鼓强度呈先增加后降低的趋势,烧结矿还原性和低温还原粉化指数呈先改善后恶化的趋势,熔融区间变宽,烧结矿矿物组成中铁酸钙的生成量呈降低的趋势。在烧结过程中稀土进入赤铁矿、铁酸钙及玻璃相中,在玻璃相中以柱状稀土矿物状态存在。

In this paper,the effects of rare earth on the quality,metallurgical performances and mineral composition of sinter are systematically studied with sinter cup as well as the occurrence states of rare earth in different minerals of sinter are analyzed with scanning electron microscope and energy spectrum.The results showed that the sinter product ratio,utilization coefficient and drum strength tended to be increased first and then decreased,reducibility and low-temperature reduction degradation index of sinter tended to be improved first and then deteriorated,melting range was widened as well as the amount of formation for calcium ferrite in the mineral composition of sinter tended to be decreased with the proportion of rare earth increased.During the sintering process,the rare earth is into hematite,calcium ferrite and glass phase as well as it exists as columnar rare earth mineral in glass phase.