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An economical converter slag-less double blowing smelting process

An economical, converter technology used in steelmaking to increase profit margins, reduce oxygen and flux consumption, and improve recycling rates

Active Publication Date: 2018-01-05
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Converter smelting mainly consumes oxygen and flux costs, and the way to reduce flux costs is to implement slag-less smelting, while reducing oxygen consumption is limited to improving the oxygen lance and oxygen supply intensity, and there are no other effective measures at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The combined blowing smelting process of the 180t converter is divided into four stages: slag solidification stage, dephosphorization stage, slagging stage, and decarburization stage. Smelting process; the specific operation steps are as follows:

[0022] 1. Slag solidification stage

[0023] The bottom blowing gas is nitrogen, and the flow rate is 1350Nm 3 / h control. After the steel is tapped from the upper furnace, the slag is poured first, and the tilting angle of the converter is between 95-100° until the slag does not flow, and then top-blown nitrogen is used to splash the slag to protect the furnace, and the flow rate is controlled at 25000-30000Nm 3 / h. If the slag is over-oxidized, add 300-500kg of special slag-splashing agent containing C and MgO through the silo. If the viscosity of the slag before slag-splashing matters, you can add less than 2 tons of light-burned dolomite after the slag-splashing is over, and pass through the shaking furnace ( The tipp...

Embodiment 2

[0032] The combined blowing smelting process of the 180t converter is divided into four stages: slag solidification stage, dephosphorization stage, slagging stage, and decarburization stage. Smelting process; the specific operation steps are as follows:

[0033] 1. Slag solidification stage

[0034] The bottom blowing gas is nitrogen, and the flow rate is 1300Nm 3 / h control. After the steel is tapped from the upper furnace, the slag is poured first, and the tilting angle of the converter is between 95-100° until the slag does not flow, and then top-blown nitrogen is used to splash the slag to protect the furnace, and the flow rate is controlled at 25000-30000Nm 3 / h. If the slag is over-oxidized, add 400-600kg of special slag-splashing agent containing C and MgO through the silo. If the viscosity of the slag before slag-splashing is a problem, you can add less than 2 tons of light-burned dolomite after the slag-splashing is over, and pass through the shaking furnace ( The...

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PUM

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Abstract

The invention relates to an economical converter little-slag combined blowing smelting process. The economical converter little-slag combined blowing smelting process is divided into four stages including the converter slag solidification stage, the dephosphorization stage, the slag discharging stage and the decarburization stage. The stages adopt different bottom-blowing gases and top-blowing gases, and the slag remaining and double slag smelting processes are adopted simultaneously. The converter little-slag combined blowing smelting process integrates the converter combined blowing process, the slag remaining process, the double slag smelting process, the converter slag cyclic utilization process and the like. The top and bottom combined blowing gas and slagging systems are changed to reduce the oxygen consumption and the flux consumption. The cyclic utilization rate of converter slag is increased, and the profit margin of converter smelting is enlarged.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to an economical converter slag-less double blowing smelting process. Background technique [0002] The current downturn in the steel industry, cost is the biggest problem facing every steel company. Converter smelting mainly consumes oxygen and flux costs, and the way to reduce flux costs is to implement slag-less smelting, while reducing oxygen consumption is limited to improving oxygen lances and oxygen supply intensity, and there are no other effective measures at present. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an economical converter less slag reblowing smelting process, which can reduce the consumption of oxygen and flux by changing the top and bottom reblowing gas and slagging system. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] An ec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36
CPCY02P10/20
Inventor 乔冠男李伟东林洋舒耀崔国亮李叶忠袁皓杨辉
Owner ANGANG STEEL CO LTD