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Top-blowing lance for converter blowing and molten iron refining method

A converter blowing and spray gun technology, applied in the direction of manufacturing converters, etc., can solve the problems of collision between powder and the inner wall of the nozzle, the relationship between suppressing the wear of the nozzle is not recorded, and it is difficult to suppress the wear of the nozzle hole, etc. The effect of nozzle wear

Inactive Publication Date: 2019-12-27
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method aims at suppressing splashing, and does not describe the relationship with suppressing nozzle wear.
In addition, since the inner wall of the nozzle has an angle with respect to the axial direction of the inner tube of the spray gun, even if the distribution of the powder passing through the nozzle part can be changed, as mentioned above, the possibility of the powder colliding with the inner wall of the nozzle is high, and it is considered difficult. Inhibits wear on nozzle holes

Method used

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  • Top-blowing lance for converter blowing and molten iron refining method
  • Top-blowing lance for converter blowing and molten iron refining method
  • Top-blowing lance for converter blowing and molten iron refining method

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Embodiment

[0056] Next, examples of the present invention will be described, but the conditions in the examples are examples of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. The present invention can employ various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0057] The pre-dephosphorization of molten iron was carried out through a 300t-scale top-bottom-blown converter. As the main raw material at this time, about 260t of molten iron containing C: 4.4-4.5%, Si: 0.2-0.5%, Mn: 0.2-0.4%, P: 0.100-0.130% in terms of mass concentration was used, and about 20t of scrap iron. Set the top-blown oxygen flow rate to 3.0Nm per 1t of molten iron 3 / min, quicklime powder with a particle size of 5-200μm is used as a powder auxiliary material, the top blowing speed is 900kg / min, and the bottom blowing ...

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Abstract

The present invention satisfies 0.19<=L / L0<=0.82, where L0, given a cross section including the center axis of a lance and bisecting a boundary plane between a flow path of a lance inner tube and a nozzle hole, is the length of a line segment which passes through the most downstream point of the lance on the boundary plane and traverses the nozzle hole on a straight line perpendicular to the lancecenter axis, and L is the length of said traversing line segment when projected within the range of the flow path of the lance inner tube on a horizontal cross section taken perpendicular to the lance center axis.

Description

technical field [0001] The present invention relates to a top-blowing lance for converter blowing used when blowing refining gas and powder onto the bath surface of molten iron in a converter for steelmaking to perform blowing, and the top-blowing lance for converter blowing using the top-blowing lance Refining method of molten iron. Background technique [0002] For example, in preliminary dephosphorization refining in the basic oxygen furnace steelmaking method, a method of blowing powder such as quicklime onto the surface of molten iron together with an oxygen jet is used. At this time, by blowing the powder into the collision surface between the oxygen jet and the molten iron, the so-called fire point, slagging is promoted and the reaction efficiency is improved. Therefore, in this method, the powder needs to be blown in as high a speed as possible so that it can reach the ignition point reliably. [0003] However, when the powder injection speed is increased, the wear...

Claims

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Application Information

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IPC IPC(8): C21C5/46C21C5/35
CPCC21C5/35C21C5/46Y02P10/20C21C5/4606
Inventor 田村铁平小野慎平
Owner NIPPON STEEL CORP
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