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Method for recovering steel ladle cast residues by using converter

A technology for pouring residual slag and ladle, which is applied in the field of recycling operation of ladle pouring residual slag converter to achieve the effects of improving utilization rate, reducing smelting cost and reducing solid waste discharge

Inactive Publication Date: 2017-06-13
QINHUANGDAO SHOUQIN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method for recovering ladle pouring residual slag converter operation, which solves the problem of recycling and reusing the slagging agent and residual steel in ladle pouring residual slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Heat 5P07523 smelting. The molten iron Si content is 0.30wt%, and the molten iron temperature is 1354°C. The amount of molten iron added is 101.9t, and the amount of scrap steel is 3t billet head scrap steel and 4t ladle poured slag steel. Slag operation: 930kg of limestone and 2750kg of limestone are added in the first batch when blowing is started, 2450kg of limestone is added in the second batch after 4 minutes of blowing, and 350kg of limestone is added in the second batch after 10 minutes of blowing. The blowing process adopts pressure gun operation, and the gun position is 1.25m. The carbon pull temperature at the end point is 1661°C, and the end point P is 0.010wt%. Lime consumption is 9.1kg / t, which is 20.9kg / t lower than that of ordinary smelting; the amount of molten steel is 102t, and the consumption of steel material is 1028kg / t, which is 8kg / t lower than that of ordinary smelting.

Embodiment 2

[0018] Heat 5P07524 smelting. The molten iron Si content is 0.30wt%, and the molten iron temperature is 1360°C. The amount of molten iron added is 100.0t, the amount of scrap steel is 4t, billet head scrap steel and 4t ladle poured slag steel. Slag operation: 879kg of limestone and 3000kg of limestone are added in the first batch when the blowing is started, 2850kg of limestone is added in the second batch after 5 minutes of blowing, and 250kg of limestone is added in the second batch after 10 minutes of blowing. The blowing process adopts pressure gun operation, and the gun position is 1.25m. The carbon pull temperature at the end point is 1663° C., and the P at the end point is 0.009 wt%. Lime consumption is 8.7kg / t, which is 21.3kg / t lower than that of ordinary smelting; the amount of molten steel is 101t, and the consumption of steel material is 1030kg / t, which is 6kg / t lower than that of ordinary smelting.

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Abstract

The invention discloses a method for recovering steel ladle cast residues by using a converter, and belongs to the technical field of production of medium-thickness plates. The method includes the steps of proportioning converter raw materials, wherein the raw materials comprise 100-102t of molten iron, 3-5t of plate-edge steel scraps and 3-5t of solid steel ladle cast residues; adding 500-1000kg of lime and 2000-3000kg of limestone in a first batch material when blowing is started, carrying out blowing for 3-6min, and adding 2000-2500kg of the limestone into a second batch material; and adopting bottom blowing operation in the blowing process, wherein the gun position is 1.2-1.3m, and the final temperature is controlled to be 1650-1670DEG C. The method for recovering the steel ladle cast residues by using the converter has the advantages that solid waste emission is reduced, and the yield of metal materials is increased, the utilization rate of slagging agents is increased, and the smelting cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of converter smelting, and in particular relates to a method for recovering and operating ladle pouring residual slag in a converter. Background technique [0002] As the sales price of the iron and steel industry gradually decreases, the production cost pressure faced by various enterprises is increasing. In this environment, various steel enterprises have carried out process improvement and technology development for energy saving and cost reduction, and various slag steel and solid waste resources have been fully recycled and reused. [0003] Shouqin Company used the slag tank transformation to change the continuous casting ladle pouring slag tank into a grid pattern, and used spraying to make the solidified slag steel easy to pour out. The slag steel poured out is put into the scrap steel hopper directly into the converter for re-eating. By optimizing the blowing operation system, the blowing operation ...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/36C21B3/06
CPCC21B3/06C21C5/28C21C5/36Y02P10/20Y02W30/50
Inventor 危尚好王国连秦登平张祥崔小勇王星刘成王文刚张振江吕延春韩晓晨李金柱邢大勇刘金旭王东柱李占军
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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