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A method for high-temperature molten iron gas atomization decarburization steelmaking

A water-gas atomization and high-temperature technology, applied in the field of decarburization steelmaking, can solve the problems of long process, low temperature, and complexity, and achieve the effects of good powder compressibility, long cooling time, and improved production efficiency

Active Publication Date: 2019-11-19
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In short, at present, the atomization treatment of molten iron generally adopts the water atomization method, and the process is long and complicated. However, it is still in the preliminary development stage in China. The method of making powder by gas atomization is only the atomization treatment of molten iron with nitrogen gas, and the temperature is low and Not effectively decarbonized

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  • A method for high-temperature molten iron gas atomization decarburization steelmaking

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Embodiment 1

[0028] The method of high-temperature molten iron gas atomization decarburization steelmaking, the specific method is to fill the high-temperature atomization chamber of the atomization furnace with a mixture of high-pressure oxidizing water vapor and hydrogen with an initial temperature of 0.42 MPa at 1170 ° C; The technology breaks the high-carbon high-temperature molten iron with a carbon content of 3.2% into fine iron droplets within an atomization time of less than 1s. Under the action of its own kinetic energy and gravity, a large number of fine iron droplets fall in the high-pressure oxidizing gas for 15-60s. During the time of flight and solidification, iron powder is formed; during the atomization time and flight time, the mixture of 80% iron droplets and 20% iron powder with a diameter of 10-50 μm chemically reacts with the oxidizing gas to form CO or CO 2 The gas, and finally the cooled iron powder turns into steel powder and falls into the lower collector of the at...

Embodiment 2

[0030] A method for high-temperature molten iron gas atomization decarburization steelmaking, the specific method is to fill the high-temperature atomization chamber of the atomization furnace with a mixture of high-pressure oxidizing water vapor, hydrogen and argon with an initial temperature of 0.25 MPa at 1250 ° C; Then, through the gas atomization technology, the high-carbon high-temperature molten iron with a carbon content of 3.9% is broken into fine iron droplets within an atomization time of less than 1s. Falling 15~60s flight time and solidification, forming iron powder; during the atomization time and flight time, the mixture of 70% iron droplet and 30% iron powder with a diameter of 10~50μm, chemically reacts with the oxidizing gas reaction to form CO or CO 2 The gas, and finally the cooled iron powder turns into steel powder and falls into the lower collector of the atomizing furnace.

Embodiment 3

[0032] A method for high-temperature molten iron gas atomization decarburization steelmaking, the specific method is to fill the high-temperature atomization chamber of the atomization furnace with a mixture of high-pressure oxidizing carbon dioxide and argon with an initial temperature of 1280 ° C and 0.3 MPa; The atomization technology breaks the high-carbon high-temperature molten iron with a carbon content of 3.6% into fine iron droplets within an atomization time of less than 1 second. Under the action of its own kinetic energy and gravity, a large number of fine iron droplets fall in the high-pressure oxidizing gas for 15~ 60s flight time and solidification to form iron powder; during the atomization time and flight time, the mixture of 65% iron droplets and 35% iron powder with a diameter of 10~50μm chemically reacts with the oxidizing gas to form CO or CO 2 The gas, and finally the cooled iron powder turns into steel powder and falls into the lower collector of the ato...

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Abstract

The invention provides a gas atomization and decarburization steelmaking method of high-temperature molten iron. A high-temperature atomization chamber of an atomization furnace is filled with high-pressure oxide gas in a specified temperature range. By a gas atomization technology, high-temperature molten iron with high carbon content is broken into superfine iron drops within specified atomization time, and under self kinetic energy and gravity action, the superfine iron drops fall and fly in a high-pressure oxide gas environment and are condensed, forming iron powder; in atomization and flying processes, carbon in the iron drops and / or the iron powder has chemical reaction with the oxide gas, forming CO or CO2 gas; and the cooled iron powder is converted to steel powder and falls in a collector at the lower part of the atomization furnace. By adopting the high-pressure and high-temperature oxide gas atomization chamber, the liquid drops are kept for certain time, and the rapid conduction of the decarburization of the liquid drops and the environmental gas is promoted; the shape of the atomized powder depends on the surface tension of molten metal and cooling and crystallizing time after the molten metal is broken, the gas atomization and cooling time of the high-temperature molten iron is long, the powder body easily forms corners, and the compressibility of the powder is great; and the production efficiency of preparing the steel powder by the molten iron is increased.

Description

technical field [0001] The invention belongs to the new technology application field of metallurgical steelmaking, and provides a new method for realizing decarburization steelmaking by performing gas atomization treatment on molten iron in a blast furnace. Background technique [0002] The steelmaking process of blast furnace molten iron is generally to form qualified billet through LD-LF / RH / VD-CC process, in which the molten iron is initially decarburized by top-blowing or bottom-blowing or top-bottom combined oxygen blowing in the converter, and atomized technology Decarburization of molten iron can also be achieved. [0003] POSCO Corporation of South Korea has disclosed a method of using molten steel to prepare iron-based powder, that is, to provide iron-based molten steel prepared through iron-making process and steel-making process to the tundish and perform water atomization operation, which can economically provide high-cleanness iron-based powder. It is a powder, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0824B22F2009/0844
Inventor 艾立群赵定国王书桓周朝刚
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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