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lf hot refining slag step by step return recycling method

A technology for refining slag and secondary circulation, which is applied in the field of steelmaking to achieve the effects of shortening the slag refining time, reducing radiation and reducing emissions

Inactive Publication Date: 2016-04-20
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the current existing technology, only the remaining LF hot refining slag from the ladle is recycled and reused, but the number of times of recycling is less than 3 times; in addition, for the hot refining slag of the LF furnace, that is, the VD of molten steel after LF refining The technology of recycling 30%-60% of LF hot refining slag that is poured or scraped off before vacuum degassing treatment and applied to LF refining has not been reported yet.

Method used

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  • lf hot refining slag step by step return recycling method
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  • lf hot refining slag step by step return recycling method

Examples

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Effect test

Embodiment 1

[0036] See figure 1 , smelting steel type 40Cr, the uncirculated furnace molten steel is refined by LF, and before VD vacuum degassing treatment, 40%-50% of LF hot refining slag is removed as the LF hot refining slag removed before VD treatment. The first step-by-step circulation of LF hot refining slag is directly poured into the ladle that circulates the molten steel in the first furnace to be refined by the LF furnace, replacing part of the pre-melted slag for LF refining, and re-creating new refining slag after four cycles , and continue to be recycled; after the continuous casting of each heat, the remaining LF hot refining slag injected into the ladle, that is, the second step-by-step cycle of the LF hot refining slag and the remaining steel is directly mixed into the electric furnace ladle, and added when the electric furnace is mixed with molten iron Electric furnace, replacing part of the slagging agent, is used for dephosphorization and desulfurization of electric fu...

Embodiment 2

[0042] See figure 2 , smelting steel type 20CrMoA, the uncirculated furnace molten steel is refined by LF, before VD treatment, remove 40%-50% of LF hot refining slag, pour it into the desulfurization slag bag, after gasification and desulfurization, then pour Put it into the ladle that circulates one furnace to be refined by LF furnace for LF refining. After six times of recycling, new refining slag is recreated and continued to be recycled; after the continuous casting of each furnace, the ladle is injected with waste heat refining slag and remaining Residual steel is directly blended into the electric furnace ladle, and when the electric furnace is mixed with molten iron, it is added to the electric furnace to replace part of the slagging material, used for dephosphorization and desulfurization of the electric furnace, and the remaining molten steel is injected into the recycled ladle; the specific parameters are shown in Table 3. Electric furnace slagging agent lime is re...

Embodiment 3

[0048] See image 3 , smelting steel type 45#, the molten steel of the uncirculated furnace is refined by LF, and before VD treatment, 40%-50% of the hot refining slag of LF is removed, and it is directly poured into the molten steel of the first circulating furnace to be refined by the LF furnace In the ladle, it is used for LF refining. After five times of recycling, new refining slag is recreated and continued to be recycled. After each continuous casting, the ladle is filled with residual heat refining slag and remaining steel and poured into a ladle for heat preservation. When molten iron is added to the electric furnace to replace part of the slagging material, it is used for dephosphorization and desulfurization in the electric furnace, and the remaining molten steel is recycled and injected into the ladle; see Table 5 for specific parameters. Electric furnace slagging agent lime is reduced by 200kg / furnace, pre-slag (slagging agent + lime) consumption is reduced by 267...

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Abstract

The invention discloses a step-by-step returning recycling method of LF (Lactoferrin) refining slag in a thermal state. Each recycling application of the method comprises the steps of primary refining step-LF refining step-VD (vacuum degassing) step-pouring step. LF refining slag with a regular amount in a thermal state is stripped after the LF refining step but before the VD step as the first step-by-step recycling LF refining slag in the thermal state which is poured directly into a steel ladle to be refined in an LF furnace in the next recycling process to replace part of pre-melted slag to be recycled and applied to the LF refining step; or the first step-by-step recycling LF refining slag in the thermal state is poured into a desulfuration slag containing ladle, gasified and desulfurated and poured into the steel ladle to be refined in the LF furnace in the next recycling process to replace part of pre-melted slag to be recycled and applied to the LF refining step. The LF refining slag in the thermal state by using the method is high in recycling and application time and low in production cost, and the quality of steel can not be affected by using the method provided by the invention.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for returning and recycling LF hot refining slag step by step. Background technique [0002] Today, in the short-process production of electric furnace, batching→primary smelting in electric furnace→LF refining→VD vacuum degassing→continuous casting production process has become the main process of short-process production in electric furnace. Specifically: According to the batching requirements, put steel scrap, molten iron, etc. into the electric furnace in sequence, and add appropriate amount of slagging materials (lime, dolomite, etc.) , Sampling and analysis, and a series of operations, so that the steel material can meet the tapping requirements through melting, oxidation (decarburization, dephosphorization), heating and other processes. In the process of tapping steel, measures such as slag-free tapping, aluminum deoxidizer pre-deoxidation, alloying of alloy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C5/52C21C7/076C21C7/064C21B3/06
CPCY02P10/20Y02W30/50
Inventor 李法兴王学利张君平赵燕徐锡坤翟正龙孟宪华郑桂芸裴建华刘永昌于学文
Owner LAIWU IRON & STEEL GRP
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