Metallurgical Development in Steel-Plant-Internal Multi-Injection Hot Metal Desulphurisation

摘要

The use of thermodynamic, statistical, and light and electron-optical microscopic methods has made it possible to analyse the course of reactions during steel-plant-internal hot metal desulphurisation. The theoretical dependence between oxygen and sulphur activity has been used to develop an EMF-measurement-based technique for determining the sulphur content as the hot metal is desulphurised. The absence of magnesium sulphide from the collection of phases in the final slag because of the greater stability and secondary formation of calcium sulphide has been explained with the aid of thermo-chemical calculations.