Vacuum deoxidation: The ladle steel was placed under vacuum through the vacuum to break the existing oxygen balance Deoxidants, prompting the reaction of carbon with oxygen, a steel deoxidation method of carbon to oxygen. Pros: do not consume alloy Shandong Deoxidants deoxy more thorough Liaoning Deoxidants, deoxygenated product is a gas, liquid steel does not pollute, but also in the exhaust gas, it is also dehydrogenation, denitrification effect. Effect of S removal reaction conditions: temperature. Favorable reaction temperature for removal S (high temperature conducive to mass transfer). Alkalinity of. An appropriate increase in alkalinity favor de S. Metal oxidation effects. (FeO) for de-S has a double effect reaction. Comprehensive speaking, low (FeO) in favor of de S. Slag impact. Moderately high amount of slag in favor of de S. Strengthening bath stirring may enhance the reaction rate of desulfurization, the desulfurization beneficial. Desulfurization slag reaction interface, good flowability conducive desulfurization slag. To sum up, in favor of de-S conditions for the "three high and one low", namely: high temperature, high alkalinity, large amount of slag, low (FeO)