镁精炼熔剂与固态杂质的结合机制研究

Research on the Interaction Mechanism between Magnesium Refining Flux and Solid Inclusions

摘要:

针对镁精炼熔剂与固态夹杂之间的作用机制不完全明确的现状，以镁精炼熔剂、MgO粉末、二者混合物、精炼环节产生的炉内底渣为对象，分别采用DSC/TG综合热分析、XRF、XRD、SEM和TEM等手段进行了多尺度表征研究，结果表明：在本研究条件下 1）镁精炼熔剂与MgO等固态夹杂之间的结合机制为“物理结合”，而非化学结合；2）镁精炼熔剂与固态夹杂之间呈现出显著的“核壳包裹”特征：固态夹杂为核，熔剂为壳包裹在外。

Abstract:

Aiming at the current lack of clarity regarding the interaction mechanism between magnesium refining fluxes and solid inclusions, this study conducted multi-scale characterization on magnesium refining flux, MgO powder, their mixtures, and the furnace bottom slag generated during the refining process. Techniques including DSC/TG thermal analysis, XRF, XRD, SEM, and TEM were employed. The results indicate that, under the conditions of this study: 1) The bonding mechanism between the magnesium refining flux and solid inclusions (such as MgO) is physical bonding rather than chemical bonding; 2) A significant "core-shell encapsulation" characteristic is observed, where the solid inclusion acts as the core and is encapsulated by the flux shell.