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Coal base hot-air rotary hearth furnace melting reduction iron-smelting method

A technology of rotary hearth furnace and hot air, which is applied in the direction of fluidized bed furnace, etc., and can solve the shortage of raw materials for electric arc furnace steelmaking, etc.

Inactive Publication Date: 2003-09-24
万天骥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned shortage of electric arc furnace steelmaking raw materials by providing a smelting reduction ironmaking method to produce iron pearls with moderate carbon content, low sulfur content and low impurities

Method used

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  • Coal base hot-air rotary hearth furnace melting reduction iron-smelting method
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  • Coal base hot-air rotary hearth furnace melting reduction iron-smelting method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 73 parts (weight, the same below) of iron ore powder (containing iron 62%), 18 parts of coal powder (12% of ash, 0.75% of sulfur), 8 parts of limestone powder (CaO 62%), 5 parts of dolomite powder (CaO+MgO=70%) and 3 parts of binder to make pellets. The particle size of the above-mentioned powder is that the particle size of the medium mineral powder is 150 mesh, and the composition of the binder is composed of 85% bentonite and 15% dextrin.

[0024] The prepared pellets are smelted and reduced in a rotary hearth furnace. The temperature of the preheating section of the furnace is 1000-1200°C, the temperature of the reducing section is 1300-1500°C, the temperature of the holding section is 1200-1400°C, and the temperature of the cooling section is 1300-1100°C. The processing time of the pellets in each of the above paragraphs was 5 minutes, 10 minutes, 5 minutes and 5 minutes respectively.

[0025] The reduced pellets are released at a temperature of about 1000°C, coo...

Embodiment 2

[0028] 75 parts (weight, the same below) of iron ore powder (62% iron content), 28 parts of coal powder (12% ash, 0.84% ​​sulfur), 8 parts of limestone powder (CaO=60%), 5 parts of Baiyun Stone powder (CaO+MgO=65%) and 3 parts of binder are mixed evenly. The particle size of the powder and the composition of the binding agent are the same as in Example 1. The mixture is then fed into a rotary hearth furnace with agglomeration function to form agglomerates with a size of 25-50 mm.

[0029] Treat this agglomerate with other process identical with embodiment, obtain the pearl iron of > 5mm as a result, it contains the iron of 93%, the carbon of 2.9%, the sulfur of 0.065%, the silicon of 0.35%.

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Abstract

The coal base hot-air bottom-rotating furnace melt-reduction iron-smelting method for producing bead iron includes the following steps: using iron ore powder, coal powder, flux and adhesive to pelletize, in the coal base hot-air bottom-rotating furnace make the above-mentioned pellets be molten and reduced, cooling reduced material, breaking and seiving so as to implement said invented method. Inthe obtained bead-iron the iron content is 93-96%, carbon content is 2.5-3.5%, sulfur content is less than 0.08% and silicon content is less than 0.3%. Said invented bead-iron is suitable for smelting steel as raw material in electric arc furnace.

Description

technical field [0001] The invention relates to a smelting reduction ironmaking method, in particular to a coal-based hot air rotary hearth furnace smelting reduction ironmaking method. Background technique [0002] Scrap steel is one of the main raw materials for modern electric arc furnace steelmaking, and the proportion of scrap steel in the metal charge is about 70%. At present, the supply of scrap steel is becoming increasingly tight in many areas, and because scrap steel is used repeatedly as raw material for electric arc furnace steelmaking, the content of elements that are not easy to oxidize, such as Cu, Ni and other harmful elements contained in it, is getting higher and higher, thus limiting this. Reuse of steel scrap. Direct reduced iron DRI (commonly known as sponge iron) can be used to replace scrap steel as raw material for electric arc furnace steelmaking. At present, more than 90% of sponge iron is produced with natural gas as reducing agent. Due to the l...

Claims

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Application Information

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IPC IPC(8): C21B11/00C21B13/00
Inventor 万天骥任大宁孔令坛黄务涤
Owner 万天骥
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