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Application of coal serving as steelmaking slag pressing agent and method for inhibiting steel slag bubbles

A slag-pressing agent and a technology for its application, which can be used in the field of suppressing steel slag bubbles, and coal is used as a slag-pressing agent in steelmaking, which can solve problems such as front slag dumping.

Inactive Publication Date: 2012-11-21
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a kind of use of coal as a slag pressing agent for steelmaking, which solves the problem that the slag must be poured before the dephosphorization converter is tapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Semi-steel is smelted; the weight of scrap steel into the furnace is 25.85 tons, the weight of molten iron is 295.2 tons, the content of C in molten iron is 4.33%, the content of Si is 0.26%, the content of S is 0.001%, the content of P is 0.0793%, the content of Mn is 0.0201%, and the temperature of molten iron is 1344°C.

[0019] Operation plan: 3 tons of slag left in this furnace, 6 tons of slag returned from the decarburization furnace, 3.0 tons of lime, 1.02 tons of light burning, 3.92 tons of sinter, 3.0 tons of cold solidified pellets, and 0.502 tons of fluorite Ton. After the converter oxygen lance is lifted, 245 kg of the slag pressing agent is added, and the steel is directly tapped without performing the slag dumping operation before tapping. After the converter adopts this operation method, it can avoid slag pouring before the converter (the inclination angle of the converter is 88°C), and directly shake to tap after the furnace.

[0020] End point: End poi...

Embodiment example 2

[0022] Smelting semi-steel: the weight of scrap steel into the furnace is 25.59 tons, the weight of molten iron is 296.19 tons, the content of C in molten iron is 4.36%, the content of Si is 0.46%, the content of P is 0.085%, the content of Mn is 0.24%, the content of S is 0.002%, and the content of molten iron is 0.002%. The temperature is 1360°C.

[0023] Operation scheme: 3 tons of slag left in this furnace, 6 tons of slag returned from the decarburization furnace, 5.639 tons of lime, 2.271 tons of light burning, 9.69 tons of sinter, 6.122 tons of cold solidified pellets, and 0.285 tons of fluorite Ton. After the converter oxygen lance is lifted, 238 kg of the slag pressing agent is added, and the steel is directly tapped without performing the slag dumping operation before tapping.

[0024] End point conditions: End point C is 3.49%, P is 0.027%, temperature is 1343°C, TFe in slag is 10.7%, the end point is well controlled, all hit the target, and the dephosphorization ra...

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Abstract

The invention discloses application of coal serving as a steelmaking slag pressing agent. Steel can be directly tapped without forward deslagging in dephosphorization smelting, smelting period is shortened, average production period is shortened from the original 35 minutes to 25 minutes, steel consumption is effectively reduced, the service life of a converter lining is prolonged, a semi-steel smelting dephosphorization furnace achieves the production target of low cost, high efficiency, energy conservation and environmental protection, environments are affected, and the requirements of semi-steel on chemical components and temperatures are met.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to the use of coal as a slag pressing agent for steelmaking and a method for suppressing steel slag bubbles. Background technique [0002] With the rise of raw material prices in the steel market and the continuous improvement of product quality by steel product users, as a new generation of "full three removal" production process, it can meet the requirements of smelting high value-added varieties of steel. "Full three removal" molten iron refers to the molten iron after desulfurization, dephosphorization and desiliconization. The dephosphorization process of the original molten iron is mainly carried out in the mixed iron car and the molten iron tank. Since the beginning of the 20th century, Nippon Steel has tested special converters in Nagoya Works, Sumitomo in Kashima Works, and Kawasaki Steel in Mizushima Steel Works for dephosphorization. By the end of the 1990s, the dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/30
Inventor 闫占辉王毅罗伯钢张新国吴耀春裴培赵长亮白艳江曾立王莉
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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