Al-Ca matter converter slag deacidizing modifier

Abstract

The invention relates to a deoxidization modifier of Al-Ca converter slag, which is a mixture compounded by or is a complex slag ball pressed by 15 percent to 35 percent of active lime, 35 percent to 50 percent of calcium carbide, 35 percent to 50 percent of aluminum powder (or aluminum grain, aluminum scrap and aluminum line segment) according to the weight ratio. Since the aluminum powder and active CaO are mixed with CaC2, no adhesives or additives are used, so additional pollution to molten steel does not exist, which is in favor of improving the quality of excellent and special steel and being no damage for ladle lining refractory materials; the aluminum has high comprehensive utilization rate, the deoxidation effect of the converter slag is good, the slag amount is low and the slag forming is fast. Because no moisture contains in raw materials, the active CaO and CaC2 can not be hydrated and the reaction ability thereof can not be decreased, thus ensuring the functions and effect thereof; the molten steel has high cleanliness and no water gap nodulation after 5 continuous casting heats.

Description

technical field [0001] The invention belongs to the field of steelmaking and refining, and in particular relates to an Al-Ca reducing and modifying agent used for eliminating final slag oxidation after tapping from a converter. Background technique [0002] Eliminating and controlling the highly oxidizing slag brought into the ladle when the converter is tapping is an important link in the production of clean steel, and it is also one of the key technologies to realize the high efficiency of the secondary refining furnace. If a lot of slag with high FeO+MnO content is brought into the ladle, it will not only deteriorate the operating conditions of secondary refining, but also deteriorate the cleanliness of molten steel and increase the cost of steelmaking production. When producing steel grades with high quality requirements, some steel mills use a slag remover to remove the oxide slag in the ladle. The slag removal often causes many losses such as co...

AI Technical Summary

Problems solved by technology

However, there are disadvantages in each: the use of bentonite will reduce the alkalinity of refining slag and affect the refining effect; when organic matter such as starch is added to molten steel, it will increase the hydrogenation of molten steel and increase the probability of white spot defects in steel; if the amount of aluminum added is too much, it will Al in slag 2 o 3 Increased content will affect subsequent refining treatment