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Production process of directly reduced iron with carbon-containing iron ore pellet

A technology for reducing iron and iron ore balls, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve problems such as impossible to obtain high metallization rate, and achieve the effect of overcoming reoxidation, improving productivity, and simple equipment

Inactive Publication Date: 2005-03-02
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Countercurrent roasting of carbon-containing iron ore pellets can also achieve reduction, but it is impossible to obtain products with high metallization ratio

Method used

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  • Production process of directly reduced iron with carbon-containing iron ore pellet
  • Production process of directly reduced iron with carbon-containing iron ore pellet

Examples

Experimental program
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Embodiment Construction

[0018] The continuous conveyor 1 carries the carbon-containing pellet material layer 2 through the reduction roasting furnace 3 for reduction roasting. The material layer is firstly dried and preheated in the drying and preheating zone 9, and then fired in the reduction roasting zone 7. The hot gas used in the drying and preheating zone is the flue gas passing through the heat exchanger 8, the temperature of which is 600-900°C, entering from the top of the material layer, and sucked out from the exhaust hole 6 below the material layer. The temperature of the material layer after preheating is 300-700°C. After entering the reduction roasting zone 7, burner 5 is used to ignite above the material layer to form a high-temperature reduction roasting layer on the upper surface, and the ignition temperature is 1300-1400 °C. At the same time, hot air with a temperature of 300-700°C is blown in from the air supply port 2 below the material layer, so that the high-temperature reduction...

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Abstract

The invention relates to a manufacturing method for a direct reductive iron which is also named as spongy iron or metalized ball. It features in ore ball bed containing carbon and iron are transmitted continuously by appliance, at first, it is dried and preheated, ignited on the surface of to form high-temp. reductive calcination layer, by making a hot blast from the bottom up the reductive calcination layer is extended from the top down to achieve that the whole bed of material carries out downstream reductive calcination. In calcination layer, CO generated in reductino burns and gives out heat around ore ball to heat ore ball itself, so that heat diffusion idstance is txtremely shortened and productivity is enhanced. In order to increase the temperature of reductive calcination layer, affluent oxygen blowing can be used.

Description

Technical field: [0001] The invention belongs to the field of metallurgical production, and relates to a production method of direct reduced iron, also known as sponge iron or metallized pellets. 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, this product is urgently needed in domestic and foreign markets. [0003] The core equipment for the production of direct reduced iron is the reduction roaster, in which the oxygen in the iron ore is taken away by the reducing agent and transformed into metallic iron. The method of producing direct reduced iron is divided into gas-based direct reduction method - using natural gas as reducing agent and coal-based direct reductio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
Inventor 王尚槐冯俊小
Owner UNIV OF SCI & TECH BEIJING
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