Molten iron slag modifier

A modifier and hot metal slag technology, applied in the field of hot metal slag modifier, to achieve the effects of easy removal, improved desulfurization efficiency and stability

Active Publication Date: 2020-12-01
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to design a molten iron slag modifier, which can carry out modification treatment for the sticky slag of blast furnace "glass slag", eliminate or reduce the desulfurization efficiency and stability of molten iron due to blast furnace "glass slag", and desulfurization slag The adverse effe

Method used

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with embodiment.

[0053] Refer to Table 6 for the composition of the embodiment of the molten iron slag modifier of the present invention.

[0054] Table 6 Unit wt%

[0055] Example CaO SiO 2

[0056] Pretreatment and desulfurization of KR hot metal in a steelmaking plant. Steel numbers 558815, 658819, 658822, and 659396A were found to be sticky slag. The operator added 100kg / package of these treatments at the end of the front pickling. The iron slag modifier of the invention. The sulfur analysis results after treatment are all 5ppm, and there is no sticky slag in the slag after desulfurization, and there is no sticky slag on the ladle and stirring paddle.

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Abstract

The invention relates to a molten iron slag modifier which comprises the following chemical components in percentage by weight: 10.0 to 20.0% of CaO; 0 < = SiO2 < = 8.0%; 25.0 to 35.0% of B2O3; 25.0 to 35.0 % of CaF2; S< = 0.05%; LOI < = 15.0%; wherein the particle size of the molten iron slag modifier is smaller than or equal to 3.0 mm, and the part of the molten iron slag modifier with the particle size being smaller than 0.1 mm does not exceed 10% by weight. The molten iron slag modifier disclosed by the invention is used for modifying the slag adhesion of the blast furnace 'glass slag ', eliminating or reducing the adverse effects of the blast furnace 'glass slag' on the desulfurization efficiency and stability of molten iron and the removal property of desulfurization slag, and reducing nodulation and slagging of a ladle, a slagging-off plate, a KR stirring paddle and the like; the problem of molten steel resulfurization caused by bringing desulfurized slag into the converter along with desulfurized molten iron is reduced; and the service lives of the ladle, the slagging-off plate, the KR stirring paddle and the like are prolonged.

Description

technical field [0001] The invention relates to molten iron pretreatment technology, in particular to a molten iron slag modifier. Background technique [0002] The harm of sulfur to steel is mainly reflected in the hot embrittlement and anisotropy of steel. During the heating process of steel, the sulfur insoluble in △Fe is precipitated on the grain boundary in the form of FeS, and the melting point of FeS is 1190°C. At 900-1200°C, it will also form a lower melting point eutectic with FeO, which will cause the steel to fracture along the grain boundary when heated, that is, hot embrittlement; because the sulfide inclusions are very soft, they are easily deformed during the heating process of the steel, and along the rolling The steel plate elongates in the manufacturing direction and forms stripe-like inclusions, which significantly reduces the transverse impact toughness value of the steel, that is, anisotropy; when the sulfur content is greater than 0.003%, the impact to...

Claims

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Application Information

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IPC IPC(8): C21C7/064
CPCC21C7/0645
Inventor 孙兴洪汪圣军连文敬孙惠民
Owner BAOSHAN IRON & STEEL CO LTD
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