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Iron-making method for producing granular iron by smelting reduction of high-phosphorus oolitic low-grade hematite in rotary hearth furnace

A technology of rotary hearth furnace and hematite, which is applied in the ironmaking field of smelting reduction of high-phosphorus oolitic-poor hematite in a rotary hearth furnace to produce granular iron, can solve problems such as raw material limitations, and achieve short process, high efficiency, and high efficiency. The effect of practical value

Inactive Publication Date: 2011-11-02
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the laboratories of several colleges and universities in China can obtain granular iron, and have conducted in-depth analysis on the formation principle of granular iron, but the raw materials are only limited to iron concentrates with a total iron grade of more than 60%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1), batching: the following raw materials are batched by weight:

[0025] 5 parts of high phosphorus oolitic lean hematite; 1 part of coal and 0.9 part of flux;

[0026] Wherein, the weight content of iron in the high-phosphorus oolitic lean hematite is 44.90%, and the weight content of phosphorus is 0.76%; the coal is non-coking coal; the calorific value of the coal is 4000kcal / Nm 3 ; The flux is limestone.

[0027] 2) Rotary hearth furnace smelting reduction reaction: Mix the above three raw materials evenly, granulate and dry, put the green balls into the rotary hearth furnace, heat to 1250-1450°C, keep for 25-40 minutes, and then turn the bottom Furnace smelting reduction reaction, high-temperature intermediate iron and slag are discharged from the rotary hearth furnace;

[0028] Wherein, the granulation method is granulation by using a double-roller high-pressure briquetting machine; the extruded carbon-containing pellets have a particle size of an oblate spheroi...

Embodiment 2

[0036] 1), batching: the following raw materials are batched by weight:

[0037] 7 parts of high phosphorus oolitic lean hematite; 3 parts of coal and 0.1 part of flux;

[0038] Wherein, the weight content of iron in the high-phosphorus oolitic lean hematite is 30%, and the weight content of phosphorus is 2%; the coal is non-coking coal; the calorific value of the coal is 9000kcal / Nm 3 ; The flux is quicklime.

[0039] 2) Rotary hearth furnace smelting reduction reaction: mix the above three raw materials evenly, granulate and dry, put the raw balls into the rotary hearth furnace, heat to 1450°C, keep for 25 minutes, and carry out the rotary hearth furnace smelting reduction reaction , discharge high-temperature intermediate grain iron and slag from the rotary hearth furnace;

[0040] Wherein, the granulation method is granulation by using a double-roller high-pressure briquetting machine; the extruded carbon-containing pellets have a particle size of an oblate spheroid with...

Embodiment 3

[0045] 1), batching: the following raw materials are batched by weight:

[0046] 8 parts of high phosphorus oolitic lean hematite; 1 part of coal and 3 parts of flux;

[0047] Wherein, the weight content of iron in the high phosphorus oolitic hematite is 60%, and the weight content of phosphorus is 0.5%; the coal is non-coking coal; the calorific value of coal is 1000kcal / Nm 3 ; The flux is calcium carbonate.

[0048] 2) Rotary hearth furnace smelting reduction reaction: mix the above three raw materials evenly, granulate and dry, put the green balls into the rotary hearth furnace, heat to 1250°C, keep for 40 minutes, and carry out the rotary hearth furnace smelting reduction reaction , discharge high-temperature intermediate grain iron and slag from the rotary hearth furnace;

[0049] Wherein, the granulation method is granulation by using a double-roller high-pressure briquetting machine; the extruded carbon-containing pellets have a particle size of an oblate spheroid wit...

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Abstract

The invention discloses an iron-making method for producing granular iron by smelting reduction of high-phosphorus oolitic low-grade hematite in a rotary hearth furnace. The method comprises the following steps of: (1) material preparation: preparing the following raw materials in parts by weight: 7 to 8 parts of high-phosphorus oolitic low-grade hematite, 1 to 3 parts of coal and 0 to 3 parts of fluxing agents; (2) smelting reduction in the rotary hearth furnace: uniformly mixing the above three raw materials, granulating, drying, delivering raw pellets to the rotary hearth furnace, heating to 1250 to 1450 DEG C, maintaining for 25 to 40 minutes, allowing the smelting reduction in the rotary hearth furnace, and discharging high-temperature granular iron intermediates and slag from the rotary hearth furnace; (3) indirect water cooling: delivering the high-temperature granular iron intermediates (600 to 1100 DEG C) and the slag to an indirect water cooling barrel which is introduced with nitrogen gas and performing cooling; and (4) dry magnetic separation: performing dry magnetic separation on the cooled granular iron intermediates and slag to obtain the final product of granular iron. The method provided by the invention has a simple process, a short flow and high efficiency, does not need charred coal, and is suitable for processing high-phosphorus oolitic low-grade hematite.

Description

technical field [0001] The invention relates to an ironmaking method for producing granulated iron by smelting and reducing high-phosphorus oolitic-poor hematite in a rotary hearth furnace. Background technique [0002] my country's high-phosphorus oolitic hematite is mainly distributed in provinces and autonomous regions such as Hubei, Hunan, Yunnan, Sichuan, Guizhou, Guangxi, Jiangxi and Gansu. The main minerals in the deposit are hematite, siderite, magnetite, limonite, oolitic chlorite, iron dolomite, quartz (chalcedony), collophanite (fine crystal apatite), calcite, Pyrite, mica and clay minerals, etc. The main ore type is hematite ore, followed by magnetite, hematite and oolitic chlorite, siderite and hematite mixed ore. The reserves of this type of iron ore are as high as 3 billion to 5 billion tons, accounting for 10% of the total iron ore reserves in my country. Most of the ores are in oolitic and massive structures, and a few have bean-shaped and kidney-shaped st...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 吴道洪曹志成
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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