Transmission method of metallized pellet, sponge iron charging bucket and bunker of electric furnace

Abstract

The invention relates to a transmission method of metallized pellet, an iron sponge charging bucket and a bunker of an electric furnace. The transmission method of the metallized pellet comprises steps of: placing a feed inlet (2) of the sponge iron charging bucket at a discharge hole (21) of a blanking pipe (22) of a rotary hearth furnace, so as to send the metallized pellet from the blanking pipe of the rotary hearth furnace into the sponge iron charging bucket; placing the sponge iron charging bucket at a feed inlet (13) of the bunker of the electric furnace, and sending the metallized pellet in the sponge iron charging bucket through the feed inlet into the bunker of the electric furnace; introducing the metallized pellet from the bunker of the electric furnace into the electric furnace; and introducing protective gas in sponge iron charging bucket in the process of sending the metallized pellet from the blanking pipe of the rotary hearth furnace into the sponge iron charging bucket. The transmission method of metallized pellet, the iron sponge charging bucket and the bunker of the electric furnace provided by the invention can effectively prevent oxidation and adhesion of the metallized pellet.

Description

technical field [0001] The invention relates to the field of direct reduction ironmaking, in particular to a transfer method of metallized pellets, a sponge iron material tank and a material bin of an electric furnace. Background technique [0002] In the direct reduction ironmaking production process, especially the metallized pellets obtained by direct reduction using a rotary hearth furnace have high temperature, high metallization rate, and high activity of metallic iron, so they are easily oxidized and bonded to each other. There have been some studies on preventing oxidation and bonding of metallized pellets. For example, there is a method to passivate the whole pile of metallized pellets, that is, passivate the surface of metallized pellets by passing oxygen-containing gas, thereby preventing the balls from The metal iron inside the pellets is further oxidized, and the pellets need to be cooled to between 35 and 120°C; there is also a method to moisten the metallized ...

AI Technical Summary

Problems solved by technology

In the above process, if no protective measures are taken during the discharge, inversion and temporary storage of the metallized pellets, the metallized pellets with high temperature and high porosity will be severely secondary oxidized when they come into contact with air, and the metallized The conversion rate is reduced by 10% to 30%, and the heat generation during the oxidation process, coupled with the high temperature of the metallized pellets themselves, makes the low melting point oxides in the metallized pellets melt and bond with each other to form agglomerates, and the metallized pellets are bonded The proportion of pellets accounts for 30% to 40% of the weight of all pellets in the tank or silo, which makes it difficult to unload the material in the tank or silo, which seriously restricts the continuity of production. As a result, the feeding is not smooth, and it is necessary to cut off the power to clean the silo, which affects the feeding and power supply system of the melting electric furnace, and increases the energy consumption per ton of iron of the melting electric furnace

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