In the Converter Steelmaking Process, the purity of the converter steel has become a major factor restricting the development of high-grade steel. The continuous development and progress of the slag blocking technology of the tapping of the converter provides an important basis and a strong guarantee for the optimization of steel grades in the future. Reducing the amount of slag in the process of converter tapping is an important part of improving the quality of molten steel. Effective slag blocking operation during tapping of the converter not only improves the quality of molten steel, reduces the return of phosphorus to the molten steel, returns sulfur, reduces inclusions in the steel, increases the yield of the alloy, but also reduces the slag of the ladle and prolongs the service life of the ladle. It is also an important process technology to reduce the cost of steelmaking. To this end, all domestic and foreign steel mills attach great importance to the research and development and application of converter slag slag technology, and various converter slag slag process technologies have emerged.
In the past, the method of using the steel slag blocking slag cap, the soft slag plug, the skateboard slag blocking the pre-slag, and the Slag Stopping Ball, the slag dart, the pneumatic slag and the skateboard slag Stop the slag. Compared with the skateboard slag blocking method, other slag blocking techniques used in the past have certain technical defects. For example, the iron slag blocking cap has a certain slag blocking effect on the pre-slag, and is ineffective for the middle and late slag control; Refractory Slag Dart can be effective. The ground slag is prevented from being slag in the early stage of the tapping, and the slag control is ineffective in the middle and late stages; the slag ball is ineffective in controlling the slag in the middle and middle stages. In the later slag slag blocking process, the slag ball is moved in the converter in a wave-by-flow manner. The tapping port has simple operation, low cost and high slag hit rate (50%~70%); the slag dart is ineffective for the previous slag control, and can flexibly adjust the specific gravity compared with the slag ball. Accurately reaching the predetermined position has a certain effect of suppressing the slag slag slag, and the slag success rate of the later slag can reach more than 90% (the success rate of the large converter slag is above 80%); the pneumatic slag method is rapid There are obvious advantages in terms of sex and reliability, but the suction vortex is easy to occur when tapping, causing steel slag to mix out, the timing of slag blocking is not easy to master, and there are insufficient working conditions and frequent parts replacement.