白云鄂博矿中稀土镧在高炉炼铁过程的传承机理

Inheritance Mechanism of Rare Earth Lanthanum in Baiyuneboite during Process of Blast Furnace Ironmaking

文章以稀土镧为对象,研究了白云鄂博矿中稀土元素镧在高炉炼铁过程的传承机理。通过热力学计算和实验表征分析了高炉炼铁过程中镧元素在渣-铁之间的微观行为。结果表明,高炉渣中的La_(2)O_(3)在高炉炼铁过程中可以被还原成LaC_(2),随后LaC_(2)溶于铁水中且镧被多孔状石墨上的含氧官能团吸附,从而使稀土能够传承到后续的炼钢工艺过程中。弥补了传统观点认为的高炉渣中稀土氧化物在高炉炼铁时很难被还原,无法继续往后续流程传承的问题。

The inheritance mechanism of rare earth element lanthanum in baiyuneboite during process of blast furnace ironmaking is studied by taking rare earth lanthanum as the object.The microscopic behaviors of lanthanum from slags to iron during process of blast furnace ironmaking are analyzed by thermodynamic calculations and experimental characterization.The results indicated that La_(2)O_(3) in blast furnace slags could be reduced to LaC_(2) during process of blast furnace ironmaking,and then LaC_(2) is dissolved in molten iron and La is adsorbed by the oxygen functional groups on porous graphite so that the rare earth could be inherited to subsequent steelmaking processes,which makes up for the problem in traditional view that the rare earth oxides in blast furnace slags are difficult to be reduced during process of blast furnace ironmaking and cannot be inherited to subsequent processes.