Influence of Converter Slag on Decomposition Behavior of Limestone During BOF Steelmaking Process

摘要

Directly charging limestone into slag in BOF is a newly emerging technique which broke through the traditional BOF slagging principle. It is necessary to study the decomposition behavior of limestone in converter slag during BOF steelmaking. FeO_x, SiO_2, MnO_x and pre-melting slags were mixed with limestone according to different quality proportion to simulate the environment of limestone in converter slag. TG-DTA results indicated that slag with individual component, including FeO_x, SiO_2 and MnO_x, all had obvious effects on reducing the decomposition temperature of limestone. Pre-melting slags with multiple components had further reducing effects than individual component. XRD results showed converter slag component would react with decomposition product of CaCO_3 and generate solid solution or oxide, reducing the activity of CaO and the decomposition temperature of CaCO_3.