The invention belongs to the technical field of
steelmaking refining and relates to
rare earth oxide-containing
steelmaking refining
slag, and a preparation method and a using method thereof. The invention is characterized in that: a refining
slag system comprises the following chemical components in percentage by
mass: 40 to 55 percent of
calcium oxide (CaO), 6 to 25 percent of aluminum
oxide (Al2O3), 3 to 16 percent of
cerium trioxide (Ce2O3), 3 to 10 percent of
magnesium oxide (MgO), 3 to 15 percent of
silicon oxide (SiO) and 1 to 6 percent of
calcium fluoride. The refining
slag system hashigh melting property,
melting temperature of between 1,300 and 1,370 DEG C, low
viscosity value of 0.1 to 0.3 Pa.s at the
steelmaking temperature of between 1,550 and 1,600 DEG C and high flowability.
Molten steel refining tests in a 200-kg
induction furnace, a 100-t combined blown converter and a 60-t arc furnace show that compared with the traditional refining slag
system, the refining slag system provided by the invention has deoxidizing rate and
impurity level
reduction rate of over 15 percent and effectively improving refining efficiency.