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Method for direct making iron and steel by converter using waste iron and steel furnace burden

A technology of scrap iron and steel and charge, which is applied in the field of steelmaking and ironmaking, can solve the problems of high energy consumption and high electricity consumption, and achieve the effect of low energy consumption and small investment

Inactive Publication Date: 2006-10-25
徐建明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The other is to use electric arc furnace or induction furnace to make steel, they use a lot of electricity, so their energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Ironmaking

[0038] step one:

[0039] a) at 2 # In the converter, first add anthracite or graphite coal, manganese ore and limestone, then add waste steel charge, blow a mixture of air and oxygen at the top of the furnace, blow the gas and powder mixture of oxygen and anthracite at the furnace side or bottom, and blow In 20-30 minutes, the temperature will rise to 1450-1500℃, and molten iron will be produced. The molten iron enters the ladle, and the molten iron output is 45%-55% of the total molten iron in the converter;

[0040] Among them: the weight of each component in the converter is:

[0041] 50-60 parts of scrap iron and steel charge

[0042] 5-8 copies of anthracite or graphite coal

[0043] 5-8 parts of manganese ore

[0044] 5~7 parts of limestone

[0045] 15-20 parts of anthracite powder,

[0046] The molar ratio of furnace top blowing air to oxygen is 1:0.8~1.2,

[0047] b) Continue to add anthracite or graphite coal, manganese ore and limestone in...

Embodiment 2

[0049] Example 2: Steelmaking

[0050] The steps are the same as in Example 1.

[0051] Step two, desiliconization, dephosphorization, and desulfurization

[0052] Simultaneously pass a mixture of lime powder and iron oxide powder and air or oxygen or nitrogen into the molten iron in the molten iron ladle in step a),

[0053] Step three, steelmaking

[0054] Load the molten iron obtained in step 2 into 1 # In the converter, first add the lime block, then add the scrap iron and steel charge, blow oxygen at the top of the furnace, and blow for 12-15 minutes. The temperature will rise to 1650~1680℃, and the molten steel will be tapped.

[0055] Among them: the amount of molten iron added is 1 # 65%-75% of the total capacity of the converter, with the balance being lime blocks and scrap iron and steel charge. The weight parts of the two are: 100 parts of scrap iron and steel charge and 8-12 parts of lime block.

[0056] Step four, ingot or billet

[0057] The step Sunde molten steel i...

Embodiment 3

[0058] Example 3: Steelmaking

[0059] The steps are the same as in Example 1.

[0060] Step two, desiliconization, dephosphorization, and desulfurization

[0061] Simultaneously pass a mixture of lime powder and iron oxide powder and air or oxygen or nitrogen into the molten iron in the molten iron ladle in step a),

[0062] Step three, steelmaking

[0063] Load the molten iron obtained in step 2 into 1 # In the converter, first add lime blocks and anthracite blocks or graphite coal blocks, then add scrap iron and steel charge, blow oxygen at the top of the furnace, blow for 12-15 minutes, and raise the temperature to 1650-1680°C, and tap molten steel.

[0064] Among them: the amount of molten iron added is 1 # 25% to 35% of the total capacity of the converter, and the balance is lime, anthracite or graphite coal and scrap iron and steel charge. The three parts by weight are: scrap iron and steel charge 100 parts, lime block 5-7 parts, anthracite block Or 3 to 5 pieces of graphit...

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PUM

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Abstract

The invention deals with the method of using the deposed steel to produce directly the iron and the steel by the converter, the steps are showed below: 1. a) in the 2# converter, firstly, the mine block without the mist or the black lead coal block, the manganese ore and the limestone are added; secondly, the deposed steel loading is added, the air and the oxygen is added from the roof, the oxygen and the blind coal powder is added from the side of the stove and the bottom of the stove, the process of blowing and smelting is keep 20-30 minutes, the temperature is promoted to the 1450-1500 to produce the molten iron, the molten iron is added in the ladle, the percentage of the outcome quantity of the molten iron accounts for the 45-55 compared with the overall molten iron; b) the blind coal block or the pot lead block, the manganese mine and the limestone are added in the converter, then the deposed steel is added, the step one is executed repeatedly. 2. the molten iron in the ladle produced by the step one a) is added with the lime powder and the ferric oxide powder and the air or the oxygen or the nitrogen, 3, the molten iron produced by the step two is loaded in the 1# converter, the deposited steel and the lime block are added, the oxygen is blow from the roof, the process keep 12-15 minutes, the temperature is promoted to the 1650-1680 to produce the molten steel, 4, the casting ingot or the casting embryo. The invention has merits such as the low invest and the low consuming energy.

Description

Technical field: [0001] The invention relates to a method for ironmaking and steelmaking. Specifically, it relates to a method for directly smelting iron and steel by using scrap iron and steel charge and using a converter. It belongs to the field of metallurgical technology. Background technique: [0002] Before the present invention was made, there were two traditional converter steelmaking methods using scrap iron and steel charge. One was a method of blowing oxygen with molten iron from a blast furnace at 1350°C to 1400°C and scrap iron and steel charge. Among them, the molten iron in the converter blast furnace is about 70% of the total capacity of the converter, and the waste steel charge is about 30%. It is heated to 1650°C to 1680°C by oxygen blowing to make high temperature molten steel, and then cast into steel ingots or billets. The blast furnace building with this method covers a large area, large foundation engineering and large investment. The other is to use electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08C21C5/28C22B5/10
Inventor 徐建明
Owner 徐建明
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