Short process iron-making device and coke-free saltpeter-free energy-saving environmental short process iron-making method thereof

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a short process iron-making device and a coke-free saltpeter-free energy-saving environmental short process iron-making method thereof. Iron mine powder is directly matched with carbon hot-pressing ball, pelletizing does not need to be sintered, coal is not subjected to coking, and the coal is not needed in thesmelting process; the inner-matched carbon pelletizing has a function of auto-restoring, does not produce NOx, the process flow is short, coal gas and high temperature flue gas produced in the smelting process are all recycled and fully used to greatly reduce the smelt cost, and melted iron is semisteel component which highly suits and meets converter steelmaking requirement. The coke-free saltpeter-free energy-saving environmental short process iron-making method is a green melted-iron-smelting new method which has the advantages of short process, high fuel adaptation, energy conservation, environment protection and emission reduction, is a best method which can replace blast furnace iron-making, and is a milestone in the technological development of the world iron-making industry.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a short-flow ironmaking device and a coke-free, nitrogen-free, energy-saving, environment-friendly short-flow ironmaking method. Background technique [0002] During blast furnace ironmaking, iron ore, coke, and flux (limestone) for slagging are loaded from the top of the furnace, and preheated air is blown in from the tuyeres located at the lower part of the furnace along the periphery of the furnace. At high temperature, the carbon in coke (some blast furnaces also inject auxiliary fuels such as pulverized coal, heavy oil, and natural gas) burns with the oxygen blown into the air to generate carbon monoxide, and removes the oxygen in the iron ore during the process of rising in the furnace. Thereby reducing iron. The smelted molten iron is released from the iron hole. The non-reducible impurities in the iron ore are combined with fluxes such as limestone to for...

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Problems solved by technology

[0007] On the whole, among the three types of pollutants produced by the iron and steel industry, most of the solid waste can be recycled and used as raw materials for cement and other building materials, and the degree of environmental pollution is extremely limited; most of the sewage (especially cooling water) is also It can be recycled through simple technological purification (physicochemical method and biochemical method), so it is not the focus of governance; and air pollutants are directly discharged into the air, causing severe weather such as smog and acid rain, and the governance is difficult. Large investment and complex equipment are the focus and difficulty of pollutant control in steel enterprises

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