Calcium deoxidizer for improving molten steel fluidity and preparation method thereof

Abstract

The invention discloses a calcium deoxidizer for improving molten steel fluidity. The calcium deoxidizer is characterized in that it is prepared from the following raw materials by weight part: 34-38 of calcium silicide, 12-16 of silicon carbide, 2.5-3.5 of flow guiding sand, 2-3 of coke powder, 3.5-5 of gelatin, and 40-50 of 5% hydrochloric acid. The method provided by the invention adopts a special technology to prepare the main component into particles and then conducts sintering to form a porous structure, thus being conducive to forming negative pressure in the molten steel and increasing the rate of reaction with oxygen. The main component is calcium silicide, at a steelmaking temperature, the steam pressure is very high, additionally, part of the deoxidation product is gas CO, the molten steel can be stirred strongly, thereby improving the molten steel fluidity, effectively removing impurities in molten steel, enhancing the molten steel purity, and preventing tundish nozzle clogging. The calcium deoxidizer is feasible in production, and can achieve good economic benefits.

Description

technical field [0001] The invention relates to the technical field of deoxidizers for steelmaking, in particular to a calcium-based deoxidizer capable of improving the fluidity of molten steel and a preparation method thereof. Background technique [0002] With economic development and scientific and technological progress, the demand for steel is increasing in industry and daily life, and the requirements for steel quality are also getting higher and higher. Therefore, in addition to increasing the improvement of steelmaking equipment and the innovation of production technology, it is also very important to strengthen the research and development of deoxidized alloys for steelmaking materials. The quality and performance of the final steel are directly affected by the level of oxygen content in the steel. [0003] In the use of molten steel final deoxidizer, it has experienced the processes of silicon aluminum iron, silicon aluminum barium and silicon aluminum barium calc...

AI Technical Summary

Problems solved by technology

This deoxidation and alloying method is affected by the end point C of molten steel, the tapping temperature and the amount of slag, resulting in large fluctuations in the composition of Si and Mn in the steel, and unstable recovery rates of alloying elements.

And when the amount of deoxidizer added is too large, the acid-soluble aluminum in molten steel exceeds a certain level, which will lead to the formation of solid Al 2 o 3 Clustered inclusions, the viscosity of molten steel increases, the inclusions increase and are not easy to float up and get rid of, eventually leading to nodules at the tundish nozzle

[0004] The deoxidizing agent in the prior art has deoxidizing effects that need to be improved, the viscosity of molten steel is too high, and the increase of inclusions is difficult to float up and get rid of, resulting in nodules at the water-filled mouth, etc.

Therefore, in order to achieve better economic benefits, it is urgent to develop a deoxidizer that can effectively solve the problems of poor fluidity of molten steel and poor deoxidation effect