Apparatus and method for producing direct reduction iron

Abstract

The invention provides a method for producing direct reduction iron. The method comprises the following steps: firstly materials are mixed to prepare carbon containing pellets, and the carbon containing pellets are dried and preheated. The method is characterized in that: the carbon containing pellets after drying and preheating are evenly distributed on a caterpillar track in a furnace body; the carbon containing pellets are heated by burners on the furnace wall and the furnace top to the temperature of between 1300 and 1400 DEG C, the carbon containing pellets are subjected to high temperature quick reduction on the caterpillar track, and the reduced finished products continuously move out of the furnace along with the caterpillar track, fall in a special heat insulation tank, continue to be slowly reduced and are placed in a melting furnace for melting. The invention also provides a device for producing direct reduction iron, which mainly comprises a furnace body, a chimney, a special heat insulation tank and a heat exchanger; the device is characterized in that the furnace body is fixedly provided with burners and a caterpillar drive mechanism consisting of a caterpillar track, a chain wheel, a chain plate and a pin shaft, a material distribution device is arranged above the caterpillar track, a mesh sieve and a transfer mechanism are arranged below the caterpillar track, and the chain plate consists of a fireproof material operating layer, a heat insulation layer and a chain plate. The invention has the advantages of having simple and reliable equipment, solving the problem of reoxidation of high temperature products and improving the utilization rate of energy.

Description

Technical field: [0001] The invention relates to the technical field of metallurgy and ironmaking, in particular to a device and method for producing direct reduced iron. Background technique: [0002] Direct reduced iron, also known as sponge iron or metallized pellets, is an important metallurgical raw material. It is a product obtained by reducing iron ore or iron-containing raw materials at a temperature lower than the melting temperature of iron. Direct reduced iron can be used in steelmaking or ironmaking. At present, direct reduced iron is developing rapidly in the world, and its output is increasing year by year. The existing devices and methods for producing direct reduced iron are divided into gas-based method and coal-based method according to the reducing agent. Gas-based direct reduction is mainly based on the shaft furnace method, which needs to use natural gas as raw material to prepare reducing gas. This method is widely used in countries and regions rich i...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the rotary hearth furnace method are: huge equipment, complex feeding and discharging equipment, long-term high temperature and high wear of the discharging equipment, making the equipment easy to damage, low metallization rate and total iron content

The problem of re-oxidation of high-temperature products in the roasting process is serious

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