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Method for operating converter furnace

An operation method and converter technology, applied in furnaces, electric furnaces, furnace types, etc., can solve problems such as iron content increase, and achieve the effect of suppressing swing

Active Publication Date: 2019-12-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] [1] Dust is generated due to bubble burst (spatter (scattering of pig iron lumps) or the separation of molten metal surface accompanied by bubbles, and the scattering of granular iron, etc.)
[0005] [2] Generation of dust due to fumes (evaporation of iron atoms)
When sloshing occurs, spillage (slag ejection) is likely to occur, so the iron content attached / accumulated near the top blowing lance, furnace wall, and furnace mouth increases

Method used

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  • Method for operating converter furnace
  • Method for operating converter furnace
  • Method for operating converter furnace

Examples

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Embodiment

[0103] Next, examples of the present invention will be described. Decarburization blowing was carried out using a 300-ton capacity converter capable of blowing oxygen from a top-blowing lance and blowing stirring gas from bottom-blowing blade ports at the bottom of the furnace (hereinafter referred to as "top-bottom-blown converter"). As the evaluation of the escape of iron components to the outside of the furnace, the pig iron lump index W under the furnace defined by the formula (12) was used.

[0104] The top blowing gun used in this embodiment has 4 Laval nozzles of the same shape as injection nozzles at the front end, and the Laval nozzles are arranged at equal intervals on concentric circles with respect to the axis of the main body of the top blowing gun. The angle formed by the axis of the top blow gun body and the center axis of the nozzle (hereinafter referred to as "nozzle inclination angle") was arranged so that it was 17°. Laval nozzle throat diameter d c 76.0mm...

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Abstract

The present invention makes it possible, when carrying out decarbonization refining of molten iron ore by top blowing oxygen gas from a top blowing lance, to suppress undulation of the molten iron andinhibit bubble bursting and spitting accompanying bubble bursting. Provided is an ore refining method for a conversion furnace that uses a top blowing lance provided with a de Laval nozzle at the bottom end for blowing oxygen gas onto the molten surface of a molten iron bath inside the converter furnace from the de Laval nozzle to decarbonize the molten iron inside the converter furnace, whereineither or both of the oxygen supply rate from the top blowing lance and the lance height LH are adjusted such that the cumulative oxygen index S (F) is 40 or less.

Description

technical field [0001] The present invention relates to a method of operating a converter for smelting molten steel from molten iron by spraying oxygen into molten iron from a plurality of Laval nozzles installed in a top blowing lance, suppressing the ejection of molten iron to the outside of the converter. Here, "molten iron" means molten iron or molten steel, and when both can be clearly distinguished, it is described as "molten iron" or "molten steel". Background technique [0002] In the decarburization refining of the converter, from the viewpoint of improving the productivity of the converter, an operation of increasing the oxygen supply amount per unit time (also referred to as "oxygen supply rate") is employed. However, when the oxygen supply amount per unit time is increased, the iron content scattered outside the furnace as dust and the like and the iron content attached and deposited near the furnace wall or the furnace mouth increase. The above-mentioned iron l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32
CPCC21C5/32C21C5/52C21C5/4606C21C5/5217
Inventor 天野胜太高桥幸雄菊池直树三木祐司
Owner JFE STEEL CORP
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