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LF (Ladle Furnace) hot steel slag recycling process

A hot-state steel slag and process technology, applied in the steel refining field of the metallurgical industry, can solve the problems of waste, waste of heat, easy welding dead slag tank, etc., and achieve the effect of simple and easy method, saving addition and reducing production cost.

Active Publication Date: 2012-07-04
HENAN FENGBAO SPECIAL STEEL CO LTD ANYANG IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this LF furnace refining process, the remaining refining slag is discharged after the refining task is completed, and recycling is not realized. The discharge of hot refining slag not only pollutes the environment, but also wastes heat. If the supply is not timely, steel is often poured according to experience. The amount of molten steel injected into the ladle generally accounts for 1% to 1.5% of the molten steel in the entire furnace.
A large amount of hot steel slag mixed with molten steel is not only easy to weld the slag tank, affecting the normal turnover, but also reduces the metal yield, causing a lot of waste, increasing the cost, and seriously affecting the economic benefits of the enterprise

Method used

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  • LF (Ladle Furnace) hot steel slag recycling process
  • LF (Ladle Furnace) hot steel slag recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, in the tundish casting furnace, after the first ladle of molten steel is cast, its sulfur content is detected to be 0.020, and the ladle is hoisted from the rotary table of the continuous casting machine with the workshop crane, and the small hook on the crane Hang the connecting piece at the bottom of the ladle, lift the small hook of the crane to overturn the ladle, and pour all the remaining steel slag and poured molten steel into another ladle after the steel is tapped from the converter. The ladle slag stays for 8 minutes after being suspended from the continuous casting, which avoids sticking to the bottom of the ladle. The smelting cycle is controlled at 24 minutes.

[0023] Refining is carried out after adding refining raw materials into the ladle. During the refining process, it is necessary to ensure that argon is blown throughout. In the stage of power supply, the pressure of argon is 0.4 MPa, and the flow rate of argon is 30 liters / min; (...

Embodiment 2

[0026] In this embodiment, in the tundish casting furnace, after the first ladle of molten steel is cast, its sulfur content is detected to be 0.025. The workshop crane is used to hang the ladle from the rotary table of the continuous casting machine. The small hook on the crane Hang the connecting piece at the bottom of the ladle, lift the small hook of the crane to overturn the ladle, and pour all the remaining steel slag and poured molten steel into another ladle after the steel is tapped from the converter. The ladle slag stays for 9 minutes after being suspended from the continuous casting, which avoids sticking to the bottom of the ladle. The smelting cycle is controlled at 25 minutes.

[0027] Refining is carried out after adding refining raw materials into the ladle. During the refining process, it is necessary to ensure that argon is blown throughout. In the stage of power supply, the pressure of argon gas is 0.4 MPa, and the flow rate of argon gas is 40 liters / min; ...

Embodiment 3

[0030] In this embodiment, in the tundish casting furnace, after the first ladle of molten steel is cast, its sulfur content is detected to be 0.045, and the ladle is hoisted from the rotary table of the continuous casting machine with the workshop crane, and the small hook on the crane Hang the connecting piece at the bottom of the ladle, lift the small hook of the crane to overturn the ladle, and pour all the remaining steel slag and poured molten steel into another ladle after the steel is tapped from the converter. The ladle slag stays for 9.5 minutes after being lifted from the continuous casting, which avoids sticking to the bottom of the ladle. The smelting cycle is controlled at 23 minutes.

[0031] Refining is carried out after adding refining raw materials into the ladle. During the refining process, it is necessary to ensure that argon gas is blown throughout. In the stage of power supply, the pressure of argon gas is 0.4 MPa, and the flow rate of argon gas is 47 li...

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Abstract

The invention provides an LF (Ladle Furnace) hot steel slag recycling process. The process is characterized in that deslagging indicates that residual hot steel slag in a steel ladle is poured into molten steel of a steel ladle of a next ladle, and then refining raw materials are added, wherein the sulfur capacity of the residual hot steel slag is larger than 0.020. The steel slag poured in the past after refining is renewedly returned to the steel ladle for recycling, thus the physical heat of steel ladle poured allowance and the steel slag can be recovered, and the consumption of various raw materials of the LF is also saved, so that the process creates considerable economic benefits for steel enterprises, reduces the pollution of the hot steel slag to the environment, protects the ecological environment and realizes circular economic benefit.

Description

technical field [0001] The invention relates to a process for recycling hot steel slag, especially a process for recycling hot steel slag in an LF furnace, which is an improvement to the refining process of an LF furnace in the existing steelmaking technology, and belongs to the steelmaking refining technology in the metallurgical industry field. Background technique [0002] As the requirements for steel quality in all walks of life are getting higher and higher, the refining technology used in the steelmaking process in the metallurgical industry is becoming more and more common. The most commonly used refining process is the LF furnace refining process. The refining process is: molten steel in steelmaking furnace Tap the steel to the ladle --- add refining raw materials in the ladle and then refine --- casting after refining --- pour out the remaining steel slag in the ladle after casting. In this LF furnace refining process, the remaining refining slag is discharged aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C21C7/076C21C7/072
CPCY02P10/20Y02W30/50
Inventor 王全吉杨红瑞宋春林常振生杨现军郭文彬任海宾任军强
Owner HENAN FENGBAO SPECIAL STEEL CO LTD ANYANG IRON & STEEL GRP
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