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Recycling method of LF scrap ladle slag inclusion

A technology for ladle and molten steel, which is applied in the field of slag recycling and utilization of waste ladle in LF furnace, can solve problems such as increasing production cost and inability to pour normally, and achieves the effect of reducing the proportion of heats, reducing the consumption of steel materials and alloys in the converter, and reducing the FeO content

Inactive Publication Date: 2013-04-17
TANGSHAN GUOFENG IRON & STEEL
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Problems solved by technology

When the oxygen content of molten steel is controlled below 40PPm, there must be a certain amount of Als in the steel, and the nozzle of the billet continuous casting machine is small, so it will not be poured normally; using high-priced refining slag on the market for molten steel slag washing or LF refining will greatly increase production cost

Method used

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Embodiment Construction

[0014] The present invention is further illustrated by examples.

[0015] A method for recycling LF furnace scrap ladle slag, comprising the following process steps:

[0016] (1) LF furnace waste ladle slag is made into refined slag after natural cooling, magnetic separation, crushing and screening, the particle size diameter is 5-30mm, and the mass percentage of chemical composition is: SiO 2 : ≤10%, CaO: ≥40%, MgO≤12%, Al 2 o 3 : 18~45%, MnO: ≤3.0%, FeO: ≤3.0%, S: ≤1.5%;

[0017] (2) The type of converter smelted steel is Q195. Add the above-mentioned refining slag to the ladle when tapping, add 2-3Kg of refining slag per ton of molten steel, and add 1 / 3 of the steel before tapping; blow argon for 3-8 minutes after tapping After argon blowing, the molten steel is hoisted to the billet continuous casting machine for steel pouring.

[0018] Due to the high alkalinity of refining slag, the R of ladle slag is increased from about 1.3 to about 2.6, which is beneficial to impr...

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Abstract

The invention relates to a recycling method of an LF (ladle furnace) scrap ladle slag inclusion, and belongs to the technical field of steelmaking in the metallurgical industry. The method adopts the technical scheme that the method comprises the following process steps that (1), the LF scrap ladle slag inclusion is subjected to natural cooling, magnetic separation, crushing and screening, and then made into refining slag, with a particle size diameter of 5-30mm, and with the following chemical components by mass percentage: less than or equal to 10% of SiO2, greater than or equal to 40% of CaO, less than or equal to 12% of MgO, 18-45% of Al2O3, less than or equal to 3.0% of MnO, less than or equal to 3.0% of FeO, and less than or equal to 1.5% of S; (2), plain carbon steel is made in a converter, the refining slag is added to a ladle during tapping, 2-3Kg refining slag is added to molten steel per ton, all the refining slag is added before 1 / 3 of a tapping course, and argon blowing is conducted for 3-8min after tapping. The method has the positive effects that the method facilitates improving ladle slag adsorption silicate inclusion capacity, reducing oxidability of the molten steel, reducing consumption of iron and steel materials and alloys in the converter, and further improving the quality of the molten steel.

Description

technical field [0001] The invention relates to a recycling method for waste ladle slag of an LF furnace, which belongs to the technical field of steelmaking in the metallurgical industry. Background technique [0002] In the steelmaking process of the metallurgical industry, LF furnace scrap ladle slag has the characteristics of high alkalinity, low oxidation, low melting point, and strong adsorption and inclusion capacity. Recycling and solid-state recovery and recycling are continuously promoted and applied in various iron and steel enterprises. The strong refining and desulfurization ability of LF furnace is its outstanding function. After the waste ladle slag of LF furnace is recycled for many times, the sulfur content in ladle slag reaches saturation, and the sulfur content drops to a low level and is discarded. For steel grades that do not require refining and desulfurization and have relatively loose requirements for sulfur in steel, using such discarded high-alkali...

Claims

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Application Information

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IPC IPC(8): C21B3/06C21C5/28C21C7/076
CPCY02P10/20Y02W30/50
Inventor 张向东孙学玉李连盈周通云
Owner TANGSHAN GUOFENG IRON & STEEL
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