Device and method for cooling direct reduction iron

Abstract

The present invention provides a device for cooling direct reduction iron, comprising a housing, wherein the housing is inside provided with a flowing bed, the housing is provided with a feeding hole connected with the feed end of the flowing bed and a discharging hole connected with the discharge end of the flowing bed, the upper part of the housing is provided with an air outlet, and the lower part of the housing lower than the flowing bed is provided with an air inlet. According to the device and the method for cooling direct reduction iron provided by the present invention, inert gas is used for cooling by flowing through the flowing bed, the cooling speed is fast, the cooled direct reduction iron contains no water, secondary drying is not needed, secondary oxidation can be prevented, and the yield is high.

Description

technical field [0001] The invention relates to the field of iron ore smelting, in particular to a device and method for cooling directly reduced iron lumps. Background technique [0002] Direct reduced iron nuggets are low-carbon porous iron-containing raw materials formed by reducing iron ore or oxidized pellets in a furnace / kiln. The particle size is 5mm-25mm. Non-magnetic powder (coal ash, desulfurizer and mineral powder), the temperature is 950 ℃ ~ 1000 ℃, its chemical composition is stable, and the impurity content is small, but due to the high temperature, it is easy to oxidize in the air, and it needs to be cooled by isolating the air. It is mainly used as a raw material for electric furnace steelmaking. It is a pure raw material for smelting high-quality steel and special steel. It acts as a diluent. It can also be used as an iron-containing raw material for casting, ferroalloy, powder metallurgy and other processes. [0003] At present, the cooling methods of the ...

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Problems solved by technology

However, these methods all have disadvantages: water immersion cooling is to immerse the direct reduced iron in a water tank for cooling, and there is a risk of bumping when the high temperature direct reduced iron is put into water, and it will also cause the direct reduced iron to be pulverized, reducing the temperature of the direct reduced iron. Yield, and the water content of the cooled direct reduced iron block is high, and secondary drying is required, which consumes energy; the cooling of the inner spray water cooling cylinder is also easy to make the water content of the direct reduced iron block high, and there is no isolation between the iron block and the air Secondary oxidation will occur due to the contact with the outside water; as the cooling medium water exchanges heat through the wall of the cooling cylinder, the heat exchange efficiency is relatively low, and a large amount of cooling water is consumed, resulting in high energy consumption.

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