Calcium deoxidizer using dolomite as refractory component and preparation method thereof

Abstract

The invention discloses a calcium deoxidizer using dolomite as the refractory component. The calcium deoxidizer is characterized in that it is prepared from the following raw materials by weight part: 32-36 of calcium silicide, 10-13 of silicon carbide, 4-6 of photovoltaic cell processing waste sand, 40-48 of 5% hydrochloric acid, 3.5-4.5 of carboxymethylcellulose sodium, 2-3 of water glass, 3-4 of dolomite, and 1-2 of manganese dioxide. The calcium deoxidizer provided by the invention adopts calcium silicide, calcium carbide and the like as the main ingredients, dolomite is added as the high temperature resistant component, and through a series of processes, a porous component can be prepared, thus accelerating the efficiency of reaction with oxygen, reducing solid Al2O3 cluster inclusions, enhancing the molten steel fluidity. Therefore, the deoxidation effect is enhanced, and the alloy element recovery rate is improved. 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 using dolomite as a refractory component 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 alu...

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