ABSTRACT

The reduction behaviour of hydrogen with FeO in synthetic molten HIsarna slag has been investigated using two experimental methods: (1) Blowing 5% or 10% H₂-Ar onto the molten slag at 1450°C, 1475°C, 1550°C, respectively; and (2) Injecting 10% H₂-Ar into the molten slag at the flowrates of 0.5, 1.0, 1.5 L min⁻¹. During the gas blowing onto the melt, the reaction is initially controlled by gas phase diffusion, followed by limitation of liquid phase diffusion. The reaction rate is significantly improved by injecting the gas into the molten slag; bubbles are generated during the gas injection resulting in ample surface area between the gas and liquid slag. The overall reduction is controlled by the liquid phase mass transfer of FeO in the injection case; described by the penetration theory.

摘要

使用两种实验方法研究了氢与 FeO 在合成熔融 HIsarna 炉渣中的还原行为： (1) 在 1450°C、1475°C、1550°C 下将5% 或 10% H ₂ -Ar 吹入熔融炉渣，分别; (2)以0.5、1.0、1.5L min ^{-1的流量向熔渣中注入10％的H} _{2 -Ar。}. 在向熔体吹气的过程中，反应最初由气相扩散控制，随后限制液相扩散。通过向熔渣中注入气体显着提高反应速率；在注气过程中产生气泡，导致气体和液体渣之间有足够的表面积。整体还原由注入箱中 FeO 的液相传质控制；渗透理论所描述的。