What is magnesium based desulfurizer

he iron and steel industry is faced with a strong demand to improve the quality and variety of steel, and the sulfur content in the steel affects this result. Sulfur has a bad effect on the properties of steel; sulfur reduces the plasticity and toughness of steel, and affects the surface quality and internal integrity of steel. Therefore, the days when the minimum sulfur content in steel is 0.035% are gone. At present, for most applications, the average sulfur content in steel is required to be ≤ 0.015%. In some steels, such as pipeline steel, the sulfur limit even reaches the level of 0.002-0.005%. However, the traditional production process of BOF is helpless for sulfur to meet the above requirements. From October 1998 to January 1999, the research group conducted an industrial test of desulfuration outside the furnace of 30t molten iron clad with magnesium based molten iron in Tianjin steel works, which treated 510t molten iron and consumed 250kg of magnesium, reducing the sulfur content of molten iron from about 0.075% to below 0.025%; the cost of desulfuration outside the furnace of magnesium based molten iron was 24 yuan / T-iron, which created a precedent of desulfuration outside the furnace of magnesium based molten iron with small tonnage (< 30t) and shallow solution pool (< 1.4m). Magnesium based desulfurizer has the advantages of low temperature, high desulfurizing efficiency and low consumption. The treatment time of molten iron is between 5-10min and the temperature drop is within 20 ℃. Magnesium based desulfurizer has the advantages of low temperature of molten iron, high desulfurizing efficiency and low consumption. The treatment time of molten iron is between 5-10min and the temperature drop is within 20 ℃. The main way to add magnesium based desulfurizer is to use nitrogen as carrier gas, which is easy to operate. The injection system is designed and assembled by Beijing University of science and technology. The injection system includes quantitative feeding device, injector, sub air bag, control instrument, delivery pipeline and spray gun. In addition, the project has carried out other methods of adding magnesium to treat molten iron in the laboratory at the same time, and has basically mastered the methods of desulfuration outside the cupola, induction furnace and small blast furnace, making the desulfuration of magnesium based molten iron furnace in China catch up with the advanced level in the world. At the same time, it fills in the blank of pretreatment of molten iron with magnesium based desulfurization, which is in the leading position. On November 2, 1999, the technology applied for patent No. (99122343x) from the State Patent Office. The technology has been used as a key project of the scientific research office and the Development Corporation of the University. On March 16, 1999, the world metal guide reported to the public.