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Method and device for manufacturing reduced iron using microwave fluid bed

A fluidized bed and reduced iron technology, applied in fluidized bed furnaces, furnaces, furnace types, etc., can solve the problems of long heating time, high energy consumption, high price, etc., to reduce secondary energy consumption, and to achieve reasonable process routes. , the effect of reducing smelting costs

Inactive Publication Date: 2006-02-15
孔凡逸 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, with the development of metallurgical technology, the methods of producing reduced iron have also been continuously improved, such as the crucible furnace external heating method, bottom converter method, etc., but various methods are also due to various difficulties such as high energy consumption and high cost. Can't promote app
[0003] Chinese patent 02116882.2 (publication number CN1403595A, published on March 19, 2003) discloses a method and equipment for coal-iron ore microwave reduction-electric furnace direct steelmaking. The heat energy required is all secondary energy microwave, which has long heating time, high energy consumption, and high cost. Its production cost is difficult to compete with traditional blast furnace technology, so it can only be used to smelt various special steels with high sales prices; (2 ) The raw material iron ore it uses is expensive high-quality magnetite containing more than 64% iron; (3) The microwave tube of the equipment is installed in the interlayer between the furnace and the shell and cooled with air. This layout is difficult to meet the needs of the microwave tube. Requirements for working in a temperature environment below 100°C

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  • Method and device for manufacturing reduced iron using microwave fluid bed
  • Method and device for manufacturing reduced iron using microwave fluid bed

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Effect test

Embodiment 1

[0020] The iron-containing raw material is limonite with 55% iron content produced in Guangxi, crushed to -150 mesh, and the carbon-containing raw material is 6500 white coal, crushed to -80 mesh, the ore-to-coal ratio is 1:0.3, and a conventional fluidized bed The volume ratio to the microwave fluidized bed is 8:1, the microwave frequency is 2.45GHz, the temperature range of the first-stage conventional fluidized bed is 1050±30°C, the temperature in the microwave fluidized bed is maintained at 1020°C, and the superheated steam is maintained at Above 550°C, the residence time of the material in the microwave fluidized bed is 8 minutes, the reaction material is cooled to below 50°C, and the material is discharged. After magnetic separation, the total Fe content of reduced iron is 86%, the meltable iron is 80%, and the metal yield is 78% %.

Embodiment 2

[0022] The iron-containing raw material is limonite with 55% iron content produced in Guangxi, which is pulverized to -100 mesh, and the carbon-containing raw material is white coal, which is pulverized to -80 mesh, and the ore-coal ratio is 1: 0.35. The volume ratio of the microwave fluidized bed is 6:1, the microwave frequency is 2.45GHz, the temperature range of the first-stage conventional fluidized bed is 1150±30°C, the temperature in the microwave fluidized bed is maintained at 1100°C, and the superheated steam is maintained at more than 550°C, the residence time of the material in the microwave fluidized bed is 9 minutes, the reaction material is cooled to below 50°C, and the material is discharged. After magnetic separation, the total Fe content of reduced iron is 83%, the meltable iron is 80%, and the metal yield is 70%. .

Embodiment 3

[0024] The iron-containing raw material is hematite with 48% iron produced in Guangxi, crushed to -120 mesh, and re-selected to a total iron content of 55%; the carbon-containing raw material is white coal, crushed to -80 mesh, and the ore-to-coal ratio is 1 : 0.35, the volume ratio of the primary conventional fluidized bed to the microwave fluidized bed is 8:1, the microwave frequency is 2.45GHz, the temperature range of the primary conventional fluidized bed is 950±30°C, the temperature in the microwave fluidized bed Maintain at 900°C, superheated steam at more than 550°C, residence time of the material in the microwave fluidized bed is 9 minutes, the reaction material is cooled to below 50°C, and the total Fe content of the reduced iron is 90% after magnetic separation, which can be The molten iron is 83%, and the metal yield is 70%.

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Abstract

The invention discloses a method to prepare reduced iron with microwave fluid bed. Wherein, mixing smashed iron ore and coal with proper proportion, preheating to reaction temperature on first fluid bed to convey into second microwave fluid bed; using water vapor to drive material as fluidized state; iron reacts with vapor to generate water-gas to reduce ferric oxide; cooling, magnetic separating, and obtaining the product; the feeding mechanism pipes of two beds connect with each other; arranging microwave tube with independent air cooling mechanism on out shell of the bed and windshield connected to steam boiler pipe on bottom of microwave fluid bed. This invention distributes technological in reason, and needs low cost.

Description

technical field [0001] The invention relates to a ferrous metal smelting technology, in particular to a method and device for producing reduced iron in a microwave fluidized bed. Background technique [0002] At present, the pig iron smelting technology of most iron and steel enterprises at home and abroad generally adopts mature blast furnace technology. Traditional blast furnace smelting reduction requires the use of expensive high-quality iron-containing ore and metallurgical coke. According to statistics, my country's crude steel output from January to June 2004 was 125 million tons, accounting for 25% of the world's output. However, my country's high-quality iron ore (containing Fe > 63%) is short of resources, and it needs to import nearly 200 million tons of high-quality iron ore from Australia, South America and other places every year; The price of coke also remained high. However, domestic rich low-grade iron ore (containing Fe<55%) is only 50% of imported o...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 孔凡逸时光哲
Owner 孔凡逸
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