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Method for heat application of low-alkalinity casting residue in steel-making

An application method and casting slag technology, applied in the field of metallurgy, can solve problems such as increased power consumption, aggravated smelting molten steel peroxidation, and insufficient heat, and achieves the effects of reducing treatment costs, reducing environmental pressure, and obvious environmental benefits

Active Publication Date: 2013-03-27
WUKUN STEEL
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] 1) Ladle casting slag is cooled, crushed, steel slag is separated, and steel particles are recycled. The slag particles are used as converter steelmaking flux, LF refining slag or discarded. The heat energy in the slag is not effectively utilized, and the discarded slag causes environmental pressure.
[0009] 2) The ladle casting slag is heated, crushed, cooled and separated, and the steel particles are recycled. The slag particles are used as converter steelmaking flux, LF refining slag or discarded. The heat energy in the slag is not effectively used, and the power consumption is increased. Residue creates environmental pressure
[0010] 3) Recycling the waste hot steel slag from steelmaking pouring into the empty ladle, tapping steel into it, and then carrying out refining and recycling, which can effectively use the heat energy of the casting slag, reduce the consumption of lime, and is beneficial to the refining slag. The sulfur capacity of residual slag is close to saturation, which limits the further desulfurization of LF refining, and the accumulation of casting residue to a certain extent will inevitably lead to waste
[0011] 4) Ladle casting slag treatment after refining can be effectively used as converter steelmaking flux, but due to the high alkalinity, generally above 2.5, semi-steel smelting still needs to be added with acid slagging agent for slagging, and semi-steel The heat of smelting itself is insufficient, and the added cold flux and slagging agent melt and absorb heat, which intensifies the peroxidation of molten steel in smelting, high consumption of steel materials, and increased oxide inclusions in steel

Method used

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  • Method for heat application of low-alkalinity casting residue in steel-making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. After tapping the steel in the upper furnace, add the high-basic hot final slag to 200kg magnesite balls for 3.5 minutes to splash the slag and leave it in the furnace (slag splash pressure 0.85MPa, slag splash gun position 800mm~1400mm), splash dry Finally, 1000kg of lime is added to the bottom of the converter before the semi-steel is put into the furnace, and then 350kg of hot cast slag with low alkalinity in the ladle is added to the converter for smelting along with 63t of the semi-steel (the carbon content of the semi-steel is 2.99%, and the phosphorus content is 0.377%).

[0032] Main Chemical Components of Low Basicity Casting Slag

[0033]

[0034] 2. When the gun blowing slag material starts to melt, start to add lime in small batches, 550Kg of lime is added in the early stage, and 300kg of lime is added after blowing for 3 minutes.

[0035] 3. Add 1000Kg of lime to 8 minutes of blowing, then add 400Kg of lime in 12 minutes, and turn down the furnace onc...

Embodiment 2

[0038] 1. After tapping the steel in the upper furnace, add the high-basic hot final slag to 200kg magnesite balls to splash the slag for 2.8 minutes and leave it in the furnace. After that, 1100kg of lime is added to the bottom of the converter before the semi-steel is put into the furnace, and then 320kg of hot casting slag with low alkalinity in the ladle is put into the converter for smelting along with 63.5t semi-steel (the carbon content of the semi-steel is 3.51%, and the phosphorus content is 0.462%).

[0039] 2. When the gun blowing slag material starts to melt, start to add lime in small batches, 650Kg of lime in the early stage, and 200kg of lime after blowing for 2.5 minutes.

[0040] 3. Add 1200Kg of lime to 8 minutes of blowing, and then add 300Kg of lime to 12 minutes. After blowing for 30 seconds to melt slag, turn down the furnace once.

[0041] 4. The temperature of the primary furnace is 1622°C, the carbon content is 0.09%, and the phosphorus content is 0.02...

Embodiment 3

[0044]1. After tapping the steel in the upper furnace, add high-basicity hot final slag to 200Kg magnesite balls to splash the slag for 3.2 minutes and leave it in the furnace. Finally, 1050kg of lime is added to the bottom of the converter before the semi-steel is put into the furnace, and then 390kg of hot casting slag with low alkalinity in the ladle is put into the converter for smelting along with 62.8t semi-steel (the carbon content of the semi-steel is 3.47%, and the phosphorus content is 0.618%).

[0045] 2. When the gun blowing slag material starts to melt, start to add lime in multiple batches, first add 570kg of lime, and then add 360kg of lime after blowing for 3 minutes.

[0046] 3. Add 1000kg of lime to 9 minutes of blowing, add 550kg of lime to 13 minutes, and turn down the furnace once every 35 seconds to 14 to differentiate slag.

[0047] 4. The temperature of the primary furnace is 1618°C, the carbon content is 0.11%, and the phosphorus content is 0.034%.

...

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Abstract

The invention provides a method for heat application of low-alkalinity casting residue in steel-making. The method comprises the following steps that: 5 to 7kg / t of low-alkalinity casting reside of steel slag is added to a converter along with semi-steel under a hot steel state in order to fully utilize the heat of the molten casting residue, and the slag can be quickly generated by blowing for 2 minutes. By adopting the method, the complex slag forming constituent and heating agent requested in a conventional semi-steel smelting process are saved, and the production cost is reduced; the high-alkalinity slag can be quickly formed at low temperature in accordance with the slag formation system; the content of phosphorus of 0.35 to 0.80% in the molten ion can be quickly removed within the normal smelting period, and the final requirement of steel grade can be met; all casting residues in steel making are basically recycled, so that the pressure of residue discharge to the environment and the handling cost can be reduced, and remarkable environment protection benefit is brought. The method brings no change to original requirement, is high in dephosphorization efficiency, and little in influence on the converter melting furnace and the capacity, can expand the steel-making capacity, is high in storage capacity and low in cost, and can be used for expanding the application of phosphorite, and reducing the production cost.

Description

[0001] technical field [0002] The invention relates to a method for utilizing steelmaking low-alkalinity casting slag in a hot state, and belongs to the technical field of metallurgy. Background technique [0003] Some steel mills, such as Baosteel and Panzhihua Iron and Steel, have conducted research on the process of ladle slag treatment after refining. By cooling, crushing and separating the steel slag from the ladle casting residue, the steel particles are recycled, and the slag particles are used as converter steelmaking flux, LF Refining slag or waste treatment can safely and environmentally friendly process high temperature ladle slag. [0004] Some steel mills such as Maanshan Iron and Steel have studied the process of granulating ladle casting slag to form steel shots and slag particles. The ladle slag is liquefied and heated to melt, and the ladle slag stream is broken into pieces by jetting high-speed airflow from a pneumatic granulator. For fine liquid droplet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/30
CPCY02P10/20
Inventor 章祝雄王定树杨春雷马燕龙赵卫东曹重苏美萍计洪刚
Owner WUKUN STEEL
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