Improved composite aluminium ball and preparation method thereof

Abstract

This invention is improvement of aluminum deoxidizer used to steelmaking and refinery. Its feature is that it is made by 10~60% aluminum and / or aluminum particle and 90~40% lime powder mixing without adhesive compression moulding. The compression moulding is done in closed system better. Comprehensive utility of aluminum of the complex aluminum ball deoxidizer can bear 100%, and there is no additional pollution to steel liquor and no harm to steel back pad refractory materials. Lime is not hydrating and reaction capability is no reduced, active lime function and effect can be ensured. Its trash extraction capability is strong, deoxidation products can be removed efficiently. Low melting point calcium aluminate content in cinder can be increased 5.0~9.0%. it is mechanical compression moulding, technique is simple, production efficiency is high, and it is 3~6 times of balling technology production rate.

Description

technical field [0001] The present invention relates to the improvement of the aluminum deoxidizer used in steelmaking, tapping and refining, especially relates to an aluminum deoxidizer suitable for special steel deoxidation, which has no pollution to molten steel, high utilization rate of aluminum, good deoxidation effect, and the deoxidation product can be deformed and Denatured aluminum deoxidizer. Background technique [0002] Deoxidizers are used in steelmaking, tapping and refining to reduce the oxygen content in molten steel to the lowest possible level, and then supplemented with other processes to obtain high-quality molten steel. There are many kinds of deoxidizers for molten steel, such as Si, Mn, Ca, Ba, Al, etc. Among them, aluminum has strong deoxidation ability, fast deoxidation speed, and can refine grains to adjust austenite crystal growth and improve the corrosion resistance of steel. Plasticity and toughness have been widely used in steelmaking. However...

AI Technical Summary

Problems solved by technology

But they have a common shortcoming: Not only do they need to be co-melted together through the smelting process, but also because their specific gravity is still lighter than the molten steel, it does not really solve the problem of burning on the surface of the molten steel because the specific gravity is light and floating. The water model in the laboratory Experiments can clearly prove this point, so there are still problems of low yield and deoxidation effect, and difficulty in floating deoxidized products

Its shortcomings are: (1) due to the high proportion of bentonite, the alkalinity of the refining slag will be reduced, which will affect the refining effect; (2) the fluorite containing up to 20% will seriously corrode the ladle lining refractory material; (3) ) Starch, cellulose and other organic matter, adding molten steel will increase the probability of white spot defects in steel, especially harmful to special steel smelting steel

However, this product still needs to use water glass or Portland cement binder, and add salt, fluorite, etc., because these substances contain crystal water, free water, sodium, fluorine and other elements, the water content in the binder Existence and spheroidization, it is easy to cause hydration of active lime, causing partial or complete failure of active lime, loss of function, which is not conducive to maintaining the quality of Youte Steel; and the existing technology also shows that the presence of elements such as sodium and fluorine is harmful to Youte. Steel quality and ladle lining are very detrimental