Ferro-aluminum balls and preparation and application methods thereof

Abstract

The invention discloses ferro-aluminum balls and preparation and application methods thereof. The ferro-aluminum balls are prepared from the following components in percent by mass: 40-45% of aluminumand the balance ferrum and inevitable impurities. The preparation method comprises the following steps: weighing metal aluminum powder and metal ferrum powder; uniformly stirring the powder by a stirrer; and pressing the powder into balls by using a high pressure ball press machine. The application method comprises the following steps: measuring components of molten steel in a later converter blowing stage and stopping smelting and tapping when the carbon content and the oxygen content reach process demands; and when 1 / 3 steel is tapped, determining the addition of the ferro-aluminum balls according to oxygen content in the molten steel and acid soluble aluminum of the molten steel and adding the ferro-aluminum balls into steel ladles through an overhead bunker. The ferro-aluminum balls have the advantages that (1) the product per ton is low in energy consumption and the preparation process is simple; (2) the content of impurities in the product is small, and no adhesives are added; (3) the product can be stored for a long time without a pulverizing phenomenon; (4) the product is moderate in density and is high in yield during use; and (5) the product is high in production efficiency and the balling rate can reach over 90%.

Description

technical field [0001] The invention relates to the technical field of molten steel deoxidizers, in particular to an aluminum-iron ball and a preparation and application method thereof. Background technique [0002] At present, the main deoxidizers in the steelmaking and tapping process of converter electric furnace are divided into aluminum deoxidizers and silicon deoxidizers, among which aluminum deoxidizers are mostly used. Among the aluminum deoxidizers, the more common ones are mainly metal aluminum ingots, aluminum-iron alloys, aluminum wires, etc. [0003] Metal aluminum ingot is an aluminum deoxidizer that casts industrial aluminum ingots into suitable sizes after remelting. Its advantages are high metal aluminum content, low content of impurity elements, and the metal aluminum content can reach more than 99%. During the process, the yield of metal aluminum is low, only about 30%. The main reason for the low yield is that the specific gravity of metal aluminum is o...

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Problems solved by technology

Its advantage is that it has a relatively large specific gravity, which can reach more than 3.5g / cm³, and can stay in molten steel for a long time during use, so that the yield of metal aluminum is higher than that of pure aluminum, which can reach 40%~50%. Its disadvantages mainly include: first, the energy consumption of the remelting process is high, and the power consumption per ton of product is more than 500kw / h; al 2 o 3 The content of oxide inclusions is high. The main reason is that during the smelting process, scrap steel needs to be melted at a high temperature of 1500 ° C. When aluminum ingots are added after melting, metal aluminum is oxidized into Al by contact with oxygen in the air. 2 o 3 , this part Al 2 o 3 Oxide not only cannot play the role of deoxidation, but also transports a part of oxide inclusions into molten steel with the melting of aluminum and iron, which affects the deoxidation effect of aluminum and iron

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