Method for converter steelmaking by LF (Ladle Furnace) refining furnace reducing slag

A converter steelmaking and refining furnace technology, applied in the field of utilization of LF refining furnace reduced slag, can solve the problems of lower utilization rate of white slag, no reference to the application of refining reduced slag, no mention of converter treatment of refining furnace white slag

Inactive Publication Date: 2013-04-10
XINJIANG BAYI IRON & STEEL
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Problems solved by technology

[0003] Retrieval literature disclosure: (1): He Huanyu et al. "Research on Phase Composition and Formation Mechanism of LF Furnace Refining Waste Slag" in Wuhan University of Science and Technology Journal 2008 (No. 5) described that the composition of LF furnace refining waste slag belongs to the calcium aluminate slag system It has good desulfurization, deoxidation and adsorption inclusion capabilities, and the waste residue has high alkalinity and strong reducibility. Its free calcium oxide content is high and its sulfur capacity is large. It has the potential for recycling in metallurgical production. value, but the literature does not mention the application of refining reducing slag in the converter

Method used

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Example Embodiment

[0012] Example

[0013] Take the smelting of Q215 steel in two LF refining furnaces with three 120-ton converters as an example:

[0014] (1) Calculated on the basis of 12,000 tons of steel produced per day, the LF refining reduction slag produced is 12 kg per ton of steel, and 144 tons per day;

[0015] (2) LF refining reduction slag is discarded and poured into 11m made of 16Mn 3 The slag pot is cooled to 850℃, and the slag pot is transported to the slag yard and turned over;

[0016] (3) Crush the slag body dumped from the slag tank to a 60mm block for use;

[0017] (4) Put the above slag blocks into the 21m3 steel scrap hopper used in the converter, add 360kg (3kg of steel per ton), and then add 25 tons of scrap steel. The scrap includes light scrap, medium scrap, heavy scrap, return scrap, etc. , The amount of scrap added is determined according to the silicon content of the molten iron to be added and the temperature of the molten iron.

[0018] (5) 120-ton converter according to ...

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Abstract

The invention provides a method for converter steelmaking by LF (Ladle Furnace) refining furnace reducing slag. The method comprises the following steps of: cooling the reducing slag to 850 plus/minus 30 DEG C, crushing the reducing slag into slag blocks with the diameters of 50-80mm, and loading 300-360kg of slag blocks into a scrap steel hopper of a converter; during smelting, adding scrap steels and the reducing slag into the converter, and then adding 105-115 tons of molten iron, wherein the temperature of the molten iron is 1250-3500 DEG C; after feeding of the converter is finished, carrying out converting by a lower gun of the converter, controlling an oxygen flow to be 15000m<3>/h, adding 2.0 tons of limes and 2.5 tons of dolomites when converting is implemented, adding 1.0 ton of limes and 0.5-1.0 ton of dolomites after the limes and the dolomites are added for 3min, adding the oxygen flow to reach 22000m<3>/h, implementing a decarbonization and temperature rising stage, maintaining for 7-12min, and then carrying out deslagging and steel tapping to finish the once melting in the smelting process.

Description

technical field [0001] The invention relates to the utilization technology of reduced slag of LF refining furnace, which is used as a slag reducing agent in converter steelmaking, can solve the pollution problem of white slag in LF refining furnace, and reduce the usage amount of fluorite at the same time. Background technique [0002] LF refining furnace reduction slag, mainly divided into CaO-MgO-SiO for smelting silicon-killed steel 2 Slag system, CaO-MgO-SiO for smelting aluminum-killed steel 2 The slag system has the following characteristics: 1) Since one of the main components of refining furnace white slag is dicalcium silicate, when the temperature is lower than about 675°C, γ-C 2 S→β-C 2 The crystal transformation of S, accompanied by a 5% volume change, is the so-called pulverization phenomenon in the study, which seriously pollutes the environment. 2) A large amount of CaO and SiO exist in the LF furnace refining reduction slag 2 、Al 2 o 3 And MgO are the m...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/076
CPCY02P10/20
Inventor 王瑞利王豫东俞海明段建勇李立明王伟胡永胜姜新平戴达奎王洪林徐江马辉杜嘉伦
Owner XINJIANG BAYI IRON & STEEL
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