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Method for reducing smelting iron loss by dephosphorization furnace slag bubblization

A foaming and slag technology, applied in the direction of manufacturing converters, can solve problems such as increased iron loss, and achieve the effects of reducing iron loss, improving dephosphorization efficiency, and improving characteristics

Active Publication Date: 2017-07-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the iron in the slag is difficult to separate from the slag in the prior art during the dephosphorization process of the converter, which increases the iron loss, and provides a method for reducing the smelting iron loss by foaming the dephosphorization slag. By adding bauxite as Foaming agent, and control the blowing intensity of the converter bottom to make the slag foam, which can separate the iron beads in the slag from the slag, and further reduce the iron loss in the dephosphorization process

Method used

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  • Method for reducing smelting iron loss by dephosphorization furnace slag bubblization
  • Method for reducing smelting iron loss by dephosphorization furnace slag bubblization

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Embodiment 1

[0031] The experiment in this example was carried out on a 150-ton top-bottom combined blowing converter, using the "double slag + slag remaining" smelting process, including the following steps: adding scrap steel, mixing in molten iron, desiliconization and dephosphorization by converter blowing, and the dephosphorization period ends Finally, adjust the bottom blowing intensity. After the slag is fully foamed, pour the dephosphorization slag, and then carry out decarburization, tapping, and leave the slag. The solid particle additive of the present invention includes 2CaO·SiO 2 Solid particles, particle size ≤ 1mm.

[0032] Such as figure 1 As shown, a method for reducing smelting iron loss by foaming dephosphorization slag in this embodiment includes the following steps:

[0033] (a) The last furnace smelts steel and leaves slag, the amount of slag left is 7866kg, and then add 3-5kg / t steel limestone to adjust the slag, preferably 4kg / t steel limestone, so that the slag c...

Embodiment 2

[0056] The basic content of this embodiment is the same as that of Example 1, except that the solid particle additive of the present invention includes 2CaO SiO 2 Solid particles and manganese ore, the particle size of manganese ore is ≤1mm, and the mass percentage of solid particle additive is 2CaO·SiO 2 Solid particles: 90%, manganese ore: 10%. Among them, the composition of manganese ore is MnO 2 : 50-53%, SiO 2: 5-7%; CaO: 20-22%, TFe: 6-8%, and the rest are impurities. Wherein the foaming agent includes bauxite and kaolin, and the mass percentage of the foaming agent is: bauxite: 90%, kaolin: 10%. Manganese ore is to reduce the viscosity of slag and reduce 2CaO·SiO 2 The effect of adding solid particles on the viscosity of the slag promotes the migration of phosphorus from the molten iron to the slag, thereby improving the dephosphorization efficiency, and the combined action of the foaming agent and the solid particle additive further improves the viscosity of the sl...

Embodiment 3

[0063] The basic content of this embodiment is the same as that of Example 1, except that the solid particle additive of the present invention includes 2CaO SiO 2 Solid particles, manganese ore and Portland cement, the particle size of which is ≤1mm, and the mass percentage of solid particle additives is 2CaO·SiO 2 Solid particles: 80%, manganese ore: 10%, Portland cement: 10%. The foaming agent includes bauxite, kaolin and mullite, and the mass percentage of the foaming agent is: bauxite: 90%, kaolin: 8%, and mullite: 2%. The components of the solid particle additive reduce the viscosity of the slag, promote the migration of phosphorus from the molten iron to the slag, and then improve the dephosphorization efficiency, and work together with the foaming agent to further improve the viscosity of the slag and make the slag have better foaming performance , thereby reducing the iron loss.

[0064] (a) Last furnace smelts steel and leaves slag, the amount of slag left is as sho...

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Abstract

The invention discloses a method for reducing smelting iron loss by dephosphorization furnace slag bubblization, and belongs to the technical field of converter steel making. The method for reducing smelting iron loss by dephosphorization furnace slag bubblization comprises the following steps: molten iron is firstly added in a converter; then, a foaming agent is added in the converter in the converter dephosphorization period; the foaming agent includes bauxite; after the dephosphorization period is finished, the bottom blowing strength of the converter is adjusted to 0.2-0.4 Nm3 / min / t steel; furnace slag realizes bubblization through bottom blowing; and converter is kept by 10-30 s before deslagging; and then, dephosphorization slag is poured out. The bauxite is added as the foaming agent to improve the state and the composition of the dephosphorized furnace slag; the bottom blowing strength of the converter is controlled to enable the furnace slag to realize bubblization; and iron balls in the furnace slag can be separated from the furnace slag, so that the iron loss in the dephosphorization process can be reduced, the content of the iron balls in the slag is largely reduced, and the steel and iron consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, and more specifically relates to a method for reducing smelting iron loss by foaming dephosphorization slag. Background technique [0002] In recent years, in the face of fierce competition in the market environment, in order to reduce production costs and improve competitiveness, domestic iron and steel enterprises have successively begun to test and study the MURC (Multi-refining Converter) converter steelmaking process of Nippon Steel Corporation of Japan—"double slag + retention Slag" smelting process, "double slag + retained slag" smelting process is: adding scrap steel, blending into molten iron → converter desiliconization, dephosphorization → dephosphorization slag in the early stage → blowing decarburization and heating → converter tapping → leaving slag. The process divides conventional converter smelting into two stages. The first stage (early stage) is mainly for desili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/34
CPCC21C5/34C21C5/36C21C2005/366
Inventor 夏云进范鼎东李杰孙桂林陶素芬吴朝阳郭鑫李孝攀
Owner ANHUI UNIVERSITY OF TECHNOLOGY