Calcium composite end deoxidizer for steelmaking and preparation method thereof

Abstract

The invention discloses a calcium composite end deoxidizer for steelmaking. The deoxidizer is characterized by being prepared from the following raw materials by weight part: 34-40 of calcium silicide, 4-5 of bamboo charcoal, 13-18 of silicon carbide, 40-50 of 5% sulfuric acid, 4-5 of Sesbania gum, 3-5 of nano-graphite powder, and 3-4 of nano-titanium dioxide. The calcium composite end deoxidizer provided by the invention does not contain aluminum element, and has reasonable composition proportion. calcium silicide, calcium carbide, bamboo charcoal, nano-graphite powder and the like are added to prepare particles, then the particles are sintered and then pickled to form porous particles, so that calcium element can be effectively dissolved in molten steel and effectively react with oxygen in molten steel at the same time, the nozzle clogging phenomenon can be improved, the molten steel fluidity is improved, thereby improving the deoxidation effect. With low cost, the calcium composite end 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 composite final deoxidizer for steelmaking and a preparation method thereof. Background technique [0002] Deoxidation of molten steel is a necessary process in the steelmaking process. During the tapping process, certain elements are added to react with oxygen to form oxides that are insoluble in molten steel, thereby achieving the purpose of removing dissolved oxygen in molten steel, and the deoxidized product is steel. The main source of non-metallic inclusions in China. In order to effectively deoxidize molten steel, the deoxidizer should be selected according to the technological requirements of steelmaking deoxidation and inclusion control, and a smaller deoxidizer should be used to remove more oxygen and reduce the content of inclusions in molten steel. The selection of deoxidizer directly affects the composition, morphology and quantit...

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