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Direct steelmaking process by using fine ores, coal and oxygen

A direct and process technology, applied in the field of steel production process, can solve the problem of no progress, and achieve the effect of saving equipment and infrastructure investment, simplifying logistics, and compacting the direct steelmaking process

Inactive Publication Date: 2010-12-08
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyclone furnace smelting reduction has only been tested in the middle and has not made any progress so far

Method used

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  • Direct steelmaking process by using fine ores, coal and oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The direct steelmaking equipment of the present invention comprises: ore grinding equipment (1), fine ore lifting equipment (2), multi-stage cyclone preheater (3), pre-reduction circulating fluidized bed (4), final reduction circulating flow Chemical bed (5), direct steelmaking furnace (6), fine ore injection equipment (7), bottom blowing or side blowing coal oxygen lance (8), direct steelmaking furnace tap hole (9), direct steelmaking furnace Slag outlet (10), gas heat exchangers (11), (13), (14), (16), gas pressurization equipment (12), gas purification equipment (15), gas removal of CO 2 and H 2 O Equipment (17).

[0039] Direct steelmaking furnace (6) is a barrel furnace, including slag zone B, molten steel zone C and gas phase zone A, the longitudinal section is as figure 1 shown.

[0040] The final reduction circulating fluidized bed (5) is connected to the direct steelmaking furnace (6) through the fine ore injection equipment (7), and the fine ore injection e...

Embodiment 2

[0047] Iron ore and 5% CaO are mixed together, enter ball mill and grind, other equipment is the same as embodiment 1.

[0048] In the direct steelmaking furnace, a molten steel pool or a molten pool mixed with steel slag is formed in advance at a temperature of 1600°C; pulverized coal, oxygen and CaO are blown into the direct steelmaking furnace, and the ratio of pulverized coal, oxygen and CaO is : 100:130:20, producing CO+H 2 85% to 100% reducing gas; finely grind the iron ore to below 100 mesh and above 325 mesh, lift the fine powder to the feed port of the multi-stage cyclone preheater with powder ore lifting equipment, and flow through the multi-stage cyclone preheater in sequence Heater and 2-stage circulating fluidized bed. High-temperature reducing gas produced by direct steelmaking furnace and CO removal 2 The circulating tail gas and the outlet gas of the circulating fluidized bed at all levels are cooled to 770 ℃ ~ 850 ℃ after heat exchange, and the reducing gas ...

Embodiment 3

[0052] The waste heat of the exhaust gas from the cyclone preheater is used for power generation. Others are with embodiment 1.

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Abstract

The invention discloses a direct steelmaking process by using fine ores, coal and oxygen. Coal dust and oxygen are blown into a high-temperature melt to produce reducing gas; by utilizing the advantages of gas phase suspension preheating of fine iron ore and high speed and high efficiency of gas phase reduction, the fine iron ore is preheated and reduced respectively in a cyclonic preheater and a recirculating fluidized bed; and the obtained pre-reduced fine iron ore with the metallization rate of over 90 percent is blown into the high-temperature melt to form molten steel. Due to the reduction at lower temperature, the generated pre-reduced fine iron ore achieves less carburization, and less decarbonization is achieved when the finished product molten steel is obtained. The direct steelmaking process simplifies the steelmaking production flow essentially. The direct steelmaking process has the advantages of high productivity, low energy consumption for each ton of steel, equipment and capital investment conservation, full simplification of physical distribution, no temperature loss in the molten iron transporting process, and easy implementation of production continuity and automatic control.

Description

technical field [0001] The invention relates to a steel production process, in particular to a process for directly producing molten steel with powdered ore and coal oxygen. Background technique [0002] At present, the most important iron and steel production process (long process) is to obtain molten steel from iron ore, which needs to go through four main process links: sintering (or pelletizing), coking, blast furnace ironmaking, and converter steelmaking, and there are many auxiliary process links. The reduction of more than 70% of iron ore in blast furnace ironmaking is indirect reduction, which is a gas-solid reaction, and the blast furnace is required to maintain good air permeability. Blast furnace use, that is, through the sintering (or pelletizing) process. The material handling capacity of sintering (or pelletizing) accounts for about the second place in iron and steel complexes (after ironmaking production), and the energy consumption ranks third after ironmaki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14
Inventor 董杰周勇
Owner LAIWU IRON & STEEL GRP
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