KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44 - Bus 2450, 3001 Leuven, Belgium.
J Hazard Mater. 2015 Apr 28;287:180-7. doi: 10.1016/j.jhazmat.2015.01.050. Epub 2015 Jan 24.
To better understand the phenomena of ZnFe2O4 spinel formation in electric arc furnace dust, the dust was characterized with particle size analysis, X-ray fluorescence (XRF), electron backscatter diffraction (EBSD), and electron probe micro-analysis (EPMA). Different ZnFe2O4 formation reaction extents were observed for iron oxide particles with different particle sizes. ZnO particles were present as both individual particles and aggregated on the surface of larger particles. Also, the slag particles found in the off-gas were shown not to react with the zinc vapor. After confirming the presence of a ZnFe2O4 formation reaction, the thermodynamic feasibility of in-process separation - a new electric arc furnace dust treatment technology - was reevaluated. The large air intake and the presence of iron oxide particles in the off-gas were included into the thermodynamic calculations. The formation of the stable ZnFe2O4 spinel phase was shown to be thermodynamically favorable in current electric arc furnace off-gas ducts conditions even before reaching the post combustion chamber.
为了更好地理解电弧炉粉尘中尖晶石型 ZnFe2O4 的形成现象，对粉尘进行了粒度分析、X 射线荧光分析（XRF）、电子背散射衍射（EBSD）和电子探针微分析（EPMA）。不同粒径的氧化铁颗粒表现出不同的 ZnFe2O4 形成反应程度。ZnO 颗粒既以单个颗粒存在，也在较大颗粒的表面上聚集。此外，发现废气中的炉渣颗粒与锌蒸气不发生反应。在确认存在 ZnFe2O4 形成反应后，重新评估了正在进行的分离过程的热力学可行性，这是一种电弧炉粉尘处理的新技术。将大量的进气量和废气中氧化铁颗粒的存在纳入热力学计算。即使在到达后燃室之前，在当前电弧炉废气管道条件下，稳定的 ZnFe2O4 尖晶石相的形成在热力学上是有利的。
