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Semi-steel smelting steelmaking method with constant pressure and constant gun

A technology for steel smelting and tons of steel, which is applied to the field of semi-steel smelting with constant pressure and constant guns, can solve problems such as increasing costs, and achieve the effects of stable process, reduced TFe content, and reduced chances of re-drying and splashing.

Active Publication Date: 2017-09-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This undoubtedly adds an additional final slag treatment step at the end of smelting, which increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A 120t converter in a factory uses semi-steel steelmaking, and the working pressure of the oxygen lance is constant at 0.90MPa. After the smelting of the previous furnace, 6kg / ton of high-magnesia lime and 10kg / ton of active lime are added to the furnace, and the furnace is shaken back and forth to mix well. Then add semi-steel and start blowing oxygen. The total amount of composite slagging agent is 15kg / ton of steel. When the progress of oxygen blowing is 0%, 90% of the remaining active lime, high magnesium lime and the total amount of composite slagging agent (13.5kg / ton of steel) are added to the furnace at one time. At the same time, quantitatively add corundum slag 1kg / ton of steel (corundum slag composition is Al 2 o 3 : 60%, CaO: 10%, MgO: 15%, V 2 o 5: 4%, the rest are impurities, the particle size is 10-50mm), when the oxygen blowing progress is 45%, 0.75kg / ton of corundum slag is added quantitatively, and 5% of the total amount of composite slagging agent ...

Embodiment 2

[0042] A factory’s 120t converter adopts semi-steel steelmaking, and the working pressure of the oxygen lance is constant at 0.90MPa. After the smelting of the previous furnace, 8kg / ton of high-magnesia lime and 8kg / ton of active lime are added to the furnace, and the furnace is shaken back and forth to mix well. Then add semi-steel and start blowing oxygen. The total amount of composite slagging agent is 18kg / ton of steel, and when the progress of oxygen blowing is 15%, 90% of the remaining active lime, high magnesium lime and the total amount of composite slagging agent (16.2kg / ton of steel) are added to the furnace at one time At the same time, quantitatively add corundum slag 1kg / ton of steel (corundum slag composition is Al 2 o 3 : 65%, CaO: 8%, MgO: 12%, V 2 o 5 : 3%, the rest are impurities, the particle size is 10-50mm), when the oxygen blowing progress is 48%, add corundum slag 0.75kg / ton of steel quantitatively, and add 5% of the total amount of composite slagging...

Embodiment 3

[0044] A 120t converter in a factory uses semi-steel steelmaking, and the working pressure of the oxygen lance is constant at 0.90MPa. After the smelting of the previous furnace, 10kg / ton of high-magnesia lime and 10kg / ton of active lime are added to the furnace, and the furnace is shaken back and forth to mix well. Then add semi-steel and start blowing oxygen. The total amount of composite slagging agent is 16kg / ton of steel. When the progress of oxygen blowing is 30%, 90% of the remaining active lime, high magnesium lime and the total amount of composite slagging agent (14.4kg / ton of steel) are added to the furnace at one time. At the same time, quantitatively add corundum slag 1kg / ton of steel (corundum slag composition is Al 2 o 3 : 70%, CaO: 5%, MgO: 10%, V 2 o 5 : 1%, the rest are impurities, the particle size is 10-50mm), when the progress of oxygen blowing is 50%, 0.75kg / ton of steel is added quantitatively, and 5% of the total amount of composite slagging agent (0....

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Abstract

The invention relates to a semi-steel smelting constant-pressure constant lance steelmaking method, and belongs to the technical field of semi-steel smelting. The semi-steel smelting constant-pressure constant lance steelmaking method is provided to reduce the process lance position fluctuation in order to fundamentally reduce the TFe content of final slag. A slagging system is optimized, and corundum slag is used to carry out early slagging and process slag adjustment in order to reach semi-steel smelting rapid slagging and reduce process drying. The TFe content and splash are fundamentally reduced through constant-pressure constant lance operation without special slag modifying treatment. The method has the advantages of simplicity in operation, low cost, reduction of the drying and splashing probability in the semi-steel smelting process, stationary process, and realization of control of the TFe content of the final slag within 17%.

Description

technical field [0001] The invention relates to a steelmaking method for semi-steel smelting with constant pressure and constant lance, and belongs to the technical field of semi-steel smelting. Background technique [0002] With the continuous decline in the profits of steel products, cost reduction has become the focus of major steel companies. Reducing the content of total iron (TFe) in the final slag is an important technical means to reduce the consumption of iron and steel materials and reduce the cost of converter smelting. Due to the use of semi-steel for steelmaking in a steel factory, the carbon content in the semi-steel after vanadium extraction is low (3.4% to 4.0%). Single, slagging speed is slow, and the smelting process is very easy to return to dryness, which makes the process frequently "adjust the gun" and the gun position fluctuates greatly, resulting in high TFe content in the final slag and low dephosphorization efficiency. [0003] Therefore, compared...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/30C21C5/36
CPCC21C5/28C21C5/30C21C5/36
Inventor 陈均曾建华梁新腾杨森祥王二军李盛周海龙冉准黄德胜陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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