Iron-containing material slag bath smelting reduction steelmaking technical method and device

Abstract

The invention relates to slag bath smelting reduction continuous steelmaking technology for iron-containing material pelletized sintering equipment. In the technology, after a thick-slag layer molten bath is formed in a slag bath furnace, combined injection of carbon-containing materials, combustible gas, oxygen or oxygen-enriched air is implemented on the top and at the bottom of the molten slag, the carbon-containing materials or the combustible gas is combusted to form high-temperature molten slag, and residual carbon or combustible gas keeps the reducibility of the molten slag; the iron-containing materials are sintered into high-temperature oxidized pellets through pelletized sintering equipment and are added into the slag bath furnace through a high-temperature loading system to be molten and reduced; and molten steel continuously flows into an oxidation furnace without slag through a beta-shaped tap hole, a fluxing agent is added into the oxidation furnace for slagging desulfuration and dephosphorization, tamping oxygen and inserted oxygen lance blowing oxygen adjusts the C content and temperature of the molten steel so as to obtain the molten steel for direct supply to LF or RH refining furnaces. The slag bath smelting reduction continuous steelmaking technology has the advantages of high production efficiency, high thermal efficiency, long service life of the furnace, short flow, easy continuity and automatic control of production, equipment and capital investment conservation, land conservation, energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a steel production process, in particular to a process method and a device for producing molten steel by smelting and reducing iron-containing material slag baths, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] my country's steel output has been the world's largest for nine consecutive years, and currently leads the world with a production capacity of more than 700 million tons. However, the pressure on energy, resources, and emissions that follow is enormous. With the increasing emphasis on environmental protection in the international community, the shortage of resources such as iron ore, steel scrap, coke, etc., especially coking coal resources, people are constantly looking for a method of ironmaking or steelmaking that does not use coking coal, such as pellet sintering equipment, Itmk3" The third-generation ironmaking method "Kobe Steel of Japan and Midrex of the United State...

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Problems solved by technology

CN87104957.0 Slot furnace continuous steelmaking process and equipment, a continuous steelmaking process with a forehearth, a trough furnace and a rear furnace, the raw material used is still blast furnace molten iron, with low efficiency and high cost

At present, the long-process blast furnace ironmaking adopts belt roaster, or grate rotary kiln and other equipment to sinter the high-temperature oxidized pellets at 1100 ° C to 1250 ° C. It needs to go through the cooling process. After cooling to room temperature, it is added to the blast furnace. The loss of heat energy is huge, and the process energy Unreasonable use

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