Electrofused Calcium Aluminate

This is a metallurgical flux used in refining furnaces. It is composed of CaO, Al2O3, and alumina-based materials that are purified and smelted by electric smelting. The base slag of refining slag usually selects a slag system at a low melting point position in the CaO-SiO2-Al2O3 ternary phase diagram. The most important function of the base slag is to control the basicity of the slag, and the basicity of the slag has a great influence on the deoxidation and desulfurization processes. Increasing the basicity can reduce the equilibrium oxygen in the steel. Refining slag can be used for refining with white slag (without adding deoxidizers) to reduce the oxygen, sulfur, and inclusion content in the steel; deoxidizers such as aluminum particles, Si-Fe, and RE can also be added to the steel to improve the refining capacity of the slag; slag basicity and oxidizability are important indicators of slag. The basicity of the slag indicates its ability to remove sulfur and phosphorus from the molten steel, while ensuring that the slag has the lowest chemical erosion of the ladle lining. This product can be divided into: sintered type and electric smelting type.

Features:

Metallurgical Effect Analysis

Desulfurization

The desulfurization of the refining agent during the refining process mainly uses the ratio between the molten slag and the molten steel to control the sulfur content in the steel. Because sulfur is one of the common harmful elements in steel, it has many adverse effects on the properties of steel. Therefore, the greater the desulfurization capacity of the refining agent, the lower the sulfur content in the molten steel.

Deoxidation

There are two different types of oxygen in the molten steel: dissolved oxygen and combined oxygen. Combined oxygen can be removed in the form of inclusions by the molten slag. During the refining process, a certain amount of deoxidizer is added to convert the dissolved oxygen in the steel into oxides to the greatest extent possible, and it can float up through its own buoyancy and appropriate low-argon blowing stirring, and finally enter the slag layer to be adsorbed. In addition, oxygen obeys the distribution law in the molten slag and molten steel. When a reducing refining agent comes into contact with the molten steel, the dissolved oxygen in the steel can enter the slag through diffusion, thereby deoxidizing the molten steel.

Inclusion Adsorption

During the refining process, due to the strong stirring action of low-argon blowing, the emulsified slag and molten steel are in large-area contact, which greatly increases the chance of contact between the slag and the impurities in the steel (especially large particles of impurities). Because the refining slag is an ionic melt formed by oxides in the molten state, and the impurities in the steel are also mostly oxide melts, according to the principle of similar compatibility, the impurities in the steel are easily combined with the slag droplets, dissolving and combining with each other to form larger slag droplets, which then capture other impurity droplets. Larger melt droplets, due to their greater buoyancy, will quickly float up and merge into the slag layer on the surface of the molten steel. The emulsified slag droplets can become nucleation crystals of deoxidation products, so that the deoxidation products quickly form stable compounds, reducing the chemical potential of the deoxidation products in the molten steel, making the reaction proceed in a direction favorable to deoxidation, and accelerating the deoxidation reaction. Due to the high content of Al2O3 in the refining agent, the composition of the slag becomes very stable and will not change the properties of the slag with the entry of deoxidation products (Al2O3). Therefore, the refining agent always maintains a very stable ability to deoxidize, desulfurize, and remove impurities.

Protective Effect on the Lining

Due to the presence of about 8%-10% MgO in the refining agent, the MgO in the molten slag basically reaches saturation, so only a small amount of MgO contained in the lining near the slag line can dissolve in the slag, thereby reducing the erosion of the lining. Secondly, the refining agent has a good foaming submerged arc effect, reducing the erosion of the electric arc on the lining, thereby improving the lining life.

The ingredients can be adjusted according to the composition of the user's molten steel to change the indicators to meet the needs of refining steel.

Packaging and Delivery

Process Flow Chart