Gas-burning reducing iron-fining furnace and one-step reducing iron-fining method thereof

Abstract

The invention discloses a gas-burning reducing iron-fining furnace and a one-step reducing iron-fining method thereof. The gas-burning reducing iron-fining furnace comprises a reducing furnace, a heat accumulation chamber and a feed bin, wherein the heat accumulation chamber and the feed bin are respectively used for preheating gas and furnace charges and delivering the gas and the furnace charges to the reducing furnace, and the furnace charges inside the reducing furnace are melted to be reduced into iron and realize slag-iron separation. The gas-burning reducing iron-fining furnace has simple structure, small investment and small occupying area and is used for the one-step reducing method to fine the iron. In the one-step reducing iron-fining method, raw materials, gas fuel and combustion air are preheated by the waste gas of the reducing furnace before entering the reducing furnace, therefore, the furnace charges can be melted by being supplied with lower heat energy in a reducing area so as to achieve the purpose of sufficiently utilizing the heat energy and reducing environment pollution, energy consumption and operation cost. The one-step reducing iron-fining method utilizes non-coke fuel, thereby further reducing the cost, having cleanness, environmental protection, emission reduction and high heat efficiency and being used for one-step iron-fining.

Description

technical field [0001] The invention belongs to the field of metal smelting, in particular to a gas reduction ironmaking furnace and a one-step reduction ironmaking method. Background technique [0002] Ironmaking in the metallurgical industry mainly includes direct method, blast furnace method and smelting reduction method, and blast furnace method is still the main force among them. In the 21st century, the iron and steel industry is facing challenges in resources, environmental protection, and economy. The traditional blast furnace ironmaking process based on coke has increasingly exposed its limitations. Due to the characteristics of short process and improved production efficiency, countries all over the world have made great efforts in research and development. [0003] ITmk3 technology is a coal-based direct reduction technology jointly developed by Kobe Steel Corporation of Japan and Midland Corporation of the United States. It is an exploratory experiment carried o...

AI Technical Summary

Problems solved by technology

In the ITmk3 standard process, the rotary hearth furnace is used as the reduction equipment, and the heating of the raw materials is carried out in the rotary hearth furnace, which requires high equipment; the raw materials must first be mixed and pelletized, and this process requires special machinery, occupying a lot of space, It is artificial and consumes a lot of energy; coal is used as fuel, and the smoke and dust emitted will pollute the environment. The waste heat can be recycled but not used in the ironmaking process

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