One Slag Practice in the AOD Process

摘要

In the report the possibilities to make use of so called 'one slag' practice inArgon Oxygen Decarburization (AOD) process are examined from both theoretical and practical points of view. The 'one slag' practice can be defined as accomplishing the AOD process without exchange of the slag for desulfurization. The greatest benefit would be achieved from shortening of the process total duration and raw material savings. When the one slag is realized, the consumption of lime, reductive alloys and fluorspar should be optimized, so that the reduction of the chromium-rich slag and desulfurization of the molten steel will be achieved with the same slag composition. In the meanwhile, the steel temperature, chromium losses to the slag and converter refractory wear should be in control and further on, the chromium losses and refractory wear should be minimized. In Germany and in Japan there are already some applications of the one slag practice in industrial scale converters. The one slag practice could be and even has to be used in smaller converters, where the temperature control is easier than in greater units and fluxing of the solid oxidation slag is a faster operation.