Calcium deoxidier with good purification effect on molten steel and preparation method thereof

Abstract

The invention discloses a calcium deoxidier with a good purification effect on molten steel. The calcium deoxidier is characterized by being prepared from the following raw materials by weight part: 35-37 of calcium silicide, 12-17 of silicon carbide, 1-2 of xanthan gum, 2-3 of industrial starch, 3-4 of black manganese ore, 40-50 of 5% hydrochloric acid, and 2.5-3.5 of AD powder. Compared with the prior art, the calcium deoxidier provided by the invention has reasonable component proportion, does not contain aluminum element, is added with black manganese ore crushed into 200 meshes, and is prepared into particles together with calcium silicide, silicon carbide and the like, and then the particles are sintered and pickled to form porous particles. The calcium deoxidier not only can effectively react with oxygen in molten steel, but also can react with sulfur in molten steel at the same time to achieve the molten steel purification effect, and improve the steel quality and alloy element recovery rate. The process is convenient for industrial control, 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 with good purifying effect on molten steel and a preparation method thereof. Background technique [0002] The level of oxygen content in steel directly affects the quality and performance of the final steel. High oxygen content will cause the carbon and oxygen to oxidize again during the condensation process of molten steel, which will cause bubbles in the steel and affect the quality of the steel; in addition, oxygen will also form FeO, Fe3O4 and other oxide forms, which are distributed on the surface of the grain boundary, which reduces the plasticity and mechanical properties of the steel, and produces hot and cold brittleness, which brings a series of hazards to the product quality of special-purpose steel. [0003] In the use of molten steel final deoxidizer, it has experienced the processes of silicon aluminum iron, silicon a...

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 and remove, eventually leading to nodulation at the tundish nozzle, and the poor fluidity of molten steel has always affected the smooth production of steelmaking plants

The composition of refractory materials, especially SiO 2 and Fe 2 o 3 The content of the acid soluble aluminum and calcium in the steel has a great influence on the loss of acid-soluble aluminum and calcium, among which the oxidized Al 2 o 3 If it cannot be floated up to the slag surface in time to remove it, the possibility of clogging the nozzle will increase