Analysis of Metallurgical Slags with Thermo Scientific ARL OPTIM'X WDXRF Sequential-Simultaneous Spectrometer

摘要

Slags originate from various stages in the iron and steel process, e.g. blast furnace, converter, Basic Oxygen Furnace (BOF also referred to as BOS = Basic Oxygen Steelmaking), electric arc furnace or ladle. In the blast furnace, slag is formed from impurities in the iron ores (known as the gangue), the flux and coke ashes. It is a complex silicate of aluminium, calcium and magnesium containing small quantities of oxides of manganese and iron as well as calcium sulfide. Slag has a double role, it permits removal of the gangue-thanks to its fusibility and fluidity, it also allows exchange reaction with the liquid metal and permits a control of the process in order for the desirable elements to stay in the melt while the others are removed. As an example, in an electric arc furnace, the slag formation process can be controlled by adding oxygen, carbon and slag formers to the melt.