Method for preparing molten iron by utilizing oxygen top blown smelting reduction ironmaking

A technology of oxygen top blowing and molten iron, applied in the fields of energy and metallurgy, can solve the problems of declining market competitiveness of enterprises, rising steel production costs, low thermal efficiency, etc., achieving the effect of achieving clean production, reducing infrastructure investment and short construction period

Inactive Publication Date: 2009-09-02
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

my country is one of the countries rich in coal and iron ore resources in the world, and the reserves are among the top in the world. However, the amount of metallurgical coke and high-grade iron ore required by blast furnaces is very small, which cannot meet the rapid development of my country's ironmaking industry. As a result, our country has to import hundreds of millions of tons of raw materials from abroad every year. Recently, the prices of coke and iron ore in the world have been rising all the way, which has caused the cost of steel production in my country to continue to rise, and the market competitiveness of enterprises has declined.
[0004] In order to develop my country's iron and steel industry better and solve the problems of high energy consumption, heavy pollution and low thermal efficiency of the existing traditional blast furnace ironmaking technology, it is necessary to fundamentally change the current smelting technology in order to make the iron and steel industry more efficient. good move forward

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  • Method for preparing molten iron by utilizing oxygen top blown smelting reduction ironmaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Iron ore (main chemical composition / %: TFe=58.08, CaO=1.46, MgO=1.97, SiO 2=8.02, S=0.23, P=0.17) broken to 2-25mm, the flux and anthracite (main chemical composition / %: volatile matter (VM)=6.86, fixed carbon (FC)=80.63, ash content=11.61, analysis Water = 0.81) is broken to 2-25mm, and then the data obtained from the batching calculation are fully mixed and added to the smelting reduction furnace from the feed port on the furnace top. The furnace temperature is maintained at 1550 ° C ~ 1750 ° C during normal production. The pressure is maintained at 0.2-1MPa. After one cycle (3 hours) of reaction, high-quality molten iron containing P<0.015% can be obtained. Since only about 20% of S can be removed during the reaction process, the molten iron must be After desulfurization treatment, it is sent to the steelmaking workshop.

Embodiment 2

[0036] Iron ore (main chemical composition / %: TFe=51.5, CaO=2.25, MgO=3.13, SiO 2 =12.5, S=0.2, P=0.15) broken to 2-25mm, the flux and lean coal (main chemical components / %: volatile matter (VM)=13.42, fixed carbon (FC)=76.07, ash content=10.21, Analysis water = 2) Broken to 2-25mm, and then the data obtained from batching calculation are fully mixed and evenly added to the smelting reduction furnace from the feed port on the top of the furnace. The blowing pressure is maintained at 0.2-1MPa. After one cycle (3 hours) of reaction, a high-quality molten iron containing P<0.013% can be obtained. Since only about 20% of S can be removed during the reaction process, the molten iron must be removed before entering the next process. After desulfurization treatment, it is sent to the steelmaking workshop.

Embodiment 3

[0038] Iron ore (main chemical composition / %: TFe=57.79, CaO=2.53, MgO=2.07, SiO 2 =9.72, S=0.25, P=0.08) broken to 2-25mm, the flux and reduced coal (main chemical components / %: volatile matter (VM)=7.06, fixed carbon (FC)=82.03, ash content=10.06, Analytical water = 1.71) is broken to 2-25mm, and then the data obtained from the batching calculation are fully mixed and added to the smelting reduction furnace from the feed port on the furnace top. The blowing pressure is maintained at 0.2-1MPa. After one cycle (3 hours) of reaction, a high-quality molten iron containing P<0.015% can be obtained. Since only about 20% of S can be removed during the reaction process, the molten iron must be removed before entering the next process. After desulfurization treatment, it is sent to the steelmaking workshop.

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Abstract

The invention relates to a method for producing molten iron by directly utilizing coal to deoxidize iron ore under smelting state, belonging to the technical field of energy source and metallurgy. The method comprises the following steps: charging iron ore, dolomite, lime and deoxidized coal are crushed, the crushed for materials are evenly mixed according to a certain proportion and added to a smelting reducing furnace from a material inlet at the top of the smelting reducing furnace; a central nitrogen pipe of a spray gun is inserted into a slag layer of a smelting pool to spray nitrogen to stir the slag layer, and one period of reaction, smelted high-temperature molten iron and slag are respectively discharged from an iron outlet and a slag outlet, wherein the oxygen jacket of the spray gun is higher than the smelting slag. In the method, raw materials do not need to be treated in advance so that a coking procedure is omitted and the environment pollution is reduced; coal of various levels can be used as fuel; the oxidizing atmosphere in the furnace is very strong so as to be very beneficial to dephophorization; and investment for the construction is low and can be recovered in a short time.

Description

1. Technical field [0001] The invention relates to a method for producing molten iron by directly utilizing pulverized coal to reduce iron ore in a molten state, and belongs to the technical field of energy and metallurgy. 2. Technical Background [0002] Steel is the basic material for my country's economic development and social construction. It exists in clothing, food, housing, and transportation, which are closely related to people's lives. It has been widely used in various fields and directly provides basic materials for the development of other industries. , so in a certain sense, the development of a country's iron and steel industry also reflects the degree of development of its national economy. The production of iron and steel materials is a complex system engineering integrating chemical industry, metallurgy and automatic control technology. At present, the international ironmaking production mainly adopts the traditional blast furnace ironmaking system (includi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00
Inventor 王华齐翼龙卿山岳争超汤忖江赵鲁梅
Owner KUNMING UNIV OF SCI & TECH
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