Direct alloying steelmaking process for manganese oxide composite briquettes used for re-blowing revolving furnace

A technology of alloying steelmaking and manganese oxide, which is applied in the manufacture of converters, etc., can solve the problems of top slag encrustation and broken LF refining furnace electrodes, etc., and achieve the effects of reducing production costs, high manganese yield, and saving energy

Inactive Publication Date: 2010-12-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this method has the risk of top slag crusting and breaking the electrodes of the LF refining furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A direct alloying steelmaking process of manganese oxide composite agglomerates for re-blowing converters: the converters are blown according to the conventional process, when the carbon content of molten steel is reduced to below 0.1% and the temperature of molten steel reaches 1680-1750 °C, it is transferred from the high-level silo to the converter Add manganese oxide composite agglomerates in one time; the quantity of manganese oxide composite agglomerates added in the converter is based on the requirement that the target residual manganese content at the end of the converter is higher than 0.8wt%, calculated as MnO, adding 15-18kg per ton of steel; then stop Blow oxygen to the molten steel, and at the same time turn on the argon blowing at the bottom of the converter to the maximum to stir the molten pool, uniform the composition and temperature of the molten steel, add manganese oxide composite agglomerates to the converter for 4 to 5 minutes, and tap the steel acco...

Embodiment 2

[0022] A direct alloying steelmaking process of manganese oxide composite agglomerates for re-blowing converters: the converters are blown according to the conventional process, when the carbon content of molten steel is reduced to below 0.1% and the temperature of molten steel reaches 1680-1750 °C, it is transferred from the high-level silo to the converter Add manganese oxide composite agglomerates in one time; the quantity of manganese oxide composite agglomerates added in the converter is based on the requirement that the target residual manganese content at the end of the converter is higher than 1.0wt%, calculated as MnO, adding 18-20kg per ton of steel; then stop Blow oxygen to the molten steel, and at the same time turn on the argon blowing at the bottom of the converter to the maximum to stir the molten pool, uniform the composition and temperature of the molten steel, and 4 to 5 minutes after adding the manganese oxide composite agglomerate to the converter, tap the st...

Embodiment 3

[0026] A direct alloying steelmaking process of manganese oxide composite agglomerates for re-blowing converters: the converter is blown according to the conventional process, when the carbon of molten steel is reduced to below 0.1% and the temperature of molten steel reaches 1650-1700 °C, it is transferred from the high-level silo to the converter. Add manganese oxide composite agglomerates at one time; the quantity of manganese oxide composite agglomerates added in the converter is based on the requirement that the target residual manganese amount at the end point of the converter is lower than 0.8wt%, calculated as per ton of steel by MnO 10~15kg; then stop feeding Oxygen is blown into the molten steel, and at the same time, the argon gas blowing at the bottom of the converter is turned on to the maximum to stir the molten pool, and the composition and temperature of the molten steel are uniform. After 2 to 4 minutes after adding manganese oxide composite agglomerates into th...

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Abstract

The invention relates to direct alloying steelmaking process for manganese oxide composite briquettes used for a re-blowing revolving furnace. The technical scheme comprises the following steps of: when the carbon content of molten steel in the revolving furnace is reduced to less than 0.1 percent and the molten steel reaches the temperature of between 1,650 and 1,750DEG C, and adding manganese oxide composite briquettes into the revolving furnace at one time, wherein the manganese oxide composite briquettes, which undergo cold pressing and mixed with carbon, are quickly heated to above 1,500 DEG C by the heat of the molten steel in the revolving furnace, the manganese oxide is quickly self-reduced in the manganese oxide composite briquettes which undergo cold pressing and mixed with carbon, so that the aim of the direct alloying of the molten steel is achieved. Oxygen blowing is stopped in the revolving furnace after the manganese oxide composite briquettes are added into the revolving furnace in order to avoid the re-oxidation of manganese, but the uniformization of manganese in the molten steel is enforced by the bottom-blowing strengthening molten pool stirring of the revolving furnace. The process of the invention has the advantages of simple process, easy operation and control, high manganese yield, great energy conservation, low CO2 emission and low production cost of the alloying of the manganese in the molten steel.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a direct alloying steelmaking process of manganese oxide composite agglomerates used in a reblowing converter. Background technique [0002] Manganese is one of the most important alloying elements in the production of iron and steel materials, so there is a saying that "no manganese can't make steel". The general steel-making manganese alloying process is to directly add manganese-containing ferroalloys such as ferromanganese and silicomanganese into the ladle during the tapping process of the converter. In order to reduce the production cost of manganese alloying in molten steel, a large number of researches on direct alloying steelmaking process of converter manganese ore have been carried out at home and abroad. This technology saves the production process of ferromanganese alloy, thus greatly saving energy and reducing CO 2 emission. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/28
Inventor 薛正良余岳赵栋楠王炜
Owner WUHAN UNIV OF SCI & TECH
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