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Method for recycling ladle slag

A technology for ladle and molten steel, applied in the direction of recycling technology and improvement of process efficiency, can solve the problems of difficulty in refining process, difficulty in precise control of ladle slag composition, and inability to accurately grasp the composition of residual slag, etc., so as to improve the refining effect. Effect

Inactive Publication Date: 2012-02-01
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method realizes the recovery and utilization of waste heat state steel slag, but this method has the following disadvantages: (1) when waste heat state ladle slag is poured into the empty ladle, it is required to blow argon to the ladle. It causes blockage of argon blowing bricks, which brings great difficulties to the subsequent refining process; (2) Due to different steel types, the composition control requirements of refining slag are also different. This method can only be implemented in the same or similar steel types. It has certain limitations; (3) The recycling method of waste heat ladle slag cannot accurately grasp the composition of the residual slag. Therefore, it is difficult to accurately control the composition of the ladle slag during the recycling process, which will affect the The refining effect of

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment is used to illustrate the ladle slag recycling method of the present invention.

[0032]Pour the residual slag in the ladle after continuous casting and pouring in the process of smelting P510L steel in the converter into the slag tank. After cooling to room temperature, it is crushed into particles with an average particle size of 10mm by a jaw crusher, and then separated by magnetic separation. Refining slag particles are obtained after removing the steel particles remaining in the slag. Using steel slag chemical composition analyzer to analyze the composition of refining slag particles, the main components of refining slag particles are: 48.5% by weight of CaO, 23.5% by weight of Al 2 o 3 , 8.5 wt% SiO 2 , 6.6 wt% MgO, 0.9 wt% FeO, 0.76 wt% MnO.

[0033] The molten steel smelted in the converter is injected into the empty ladle for tapping, and argon is blown into the ladle at the rate of 1-2.5 liters / minute per ton of molten steel by means of bott...

Embodiment 2

[0039] This embodiment is used to illustrate the ladle slag recycling method of the present invention.

[0040] Pour the residual slag in the ladle after continuous casting and pouring in the process of smelting L360MB steel in the converter into the slag tank. After cooling to room temperature, the jaw crusher crushes it into particles with an average particle size of 5mm, and then separates the remaining slag by magnetic separation. Refining slag particles are obtained after removing the steel particles remaining in the slag. Using steel slag chemical composition analyzer to analyze the composition of refining slag particles, the main components of refining slag particles are 47.6% by weight of CaO, 22.8% by weight of Al 2 o 3 , 9.2 wt% SiO 2 , 5.9 wt% MgO, 0.87 wt% FeO, 0.81 wt% MnO.

[0041] The molten steel smelted in the converter is injected into the empty ladle for tapping. At the same time, argon is blown into the ladle at a rate of 1-2.5 standard liters per minute...

Embodiment 3

[0045] This embodiment is used to illustrate the ladle slag recycling method of the present invention.

[0046] Pour the residual slag in the ladle after continuous casting and pouring in the process of smelting J55 steel in the converter into the slag tank, after cooling to room temperature, crush it into particles with an average particle size of 20mm by the jaw crusher, and then select them by magnetic separation Refining slag particles are obtained after removing the steel particles remaining in the slag. Using steel slag chemical composition analyzer to analyze the composition of refining slag particles, the main components of refining slag particles are 49.2% by weight of CaO, 21.8% by weight of Al 2 o 3 , 8.5 wt% SiO 2 , 6.2% by weight of MgO, 0.91% by weight of FeO, 0.79% by weight of MnO.

[0047] The molten steel smelted in the converter is injected into the empty ladle for tapping. At the same time, argon is blown into the ladle at a rate of 1-2.5 standard liters...

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Abstract

The invention provides a method for recycling ladle slag, comprising the following steps: carrying out solidification and fragmentation on the ladle slag, and then carrying out iron election, allowing residues after iron election as refining slag to contact with molten steel containing added alloy for LF refining. According to the invention, the recycle of the ladle slag is realized, and slag component in the recycle process can be accurately controlled, so that effect of refining of the molten steel is further improved; by adding the refining slag in the alloyed molten steel, the problem of argon blowing fault generated in tapping after adding the ladle slag in the empty ladle, and the time of refining of the molten steel is greatly reduced.

Description

technical field [0001] The invention relates to a method for recycling ladle slag. Background technique [0002] Ladle slag refining is a steelmaking technology commonly used in the metallurgical industry, and ladle slag modification and composition control technology are key technologies for smelting outside the furnace. The properties of ladle slag directly affect the metallurgical effect of the refining process. High alkalinity reducing ladle slag has the functions of deoxidation, desulfurization and removal of inclusions. When the alkaline reducing slag is in close contact with molten steel, the actual oxygen and sulfur values ​​in the molten steel are greater than the oxygen and sulfur values ​​in balance with the slag. Diffusion of oxygen and sulfur in molten steel to slag; CaO, Al in refining slag 2 0 3 Such components can be combined with deoxidized products such as Si, Al, Mn, etc. to form low-melting compounds, thereby reducing the activity of deoxidized products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21B3/06
CPCY02P10/20Y02W30/50
Inventor 曾建华冯远超陈永张敏李桂军肖明富陈靓
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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