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Method and device for producing micron-sized superfine iron powder through regenerative iron red

A technology of ultra-fine iron powder and micron level, which is applied in the field of metallurgical powder making, can solve the problems of difficulty in realizing large-scale industrial production and popularization and application, inability to realize continuous production well, high cost of carbonyl iron powder, etc., and achieve the source of raw materials Sufficient, less stressful, energy-saving effect

Inactive Publication Date: 2015-03-25
武汉钢铁有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, after the reduction is completed, the reducing gas needs to be turned off, and the iron powder is blown out for storage, which cannot achieve continuous production well.
Moreover, due to the need for high-pressure hydrogen during fluidized bed production, the equipment is complex and the safety is poor
In addition, the production of ultra-fine iron powder by the carbonyl method requires high pressure, and the carbonyl group is toxic, the production process is complicated, and the control is difficult. Therefore, the cost of carbonyl iron powder is high and the output is low.
[0004] In summary, the existing micron-sized ultrafine iron powder preparation methods are difficult to achieve large-scale industrial production and popularization due to many reasons such as high raw material prices, complex equipment, harsh reaction conditions, or inability to continue production.

Method used

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  • Method and device for producing micron-sized superfine iron powder through regenerative iron red

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Fe in raw material recycled iron red 2 o 3 The content is 98.5%, the particle size range is 0.5-10 μm, and the average particle size is 0.85 μm. The rotating speed of the spiral blade is 5r / min, the reducing gas H 2 The flow rate is 0.35m 3 / min, the reducing gas inlet pressure is controlled at 0.3MPa, the reducing temperature is 550°C, and the reaction time is 20min. The protective gas is nitrogen, and the flow rate is controlled at 1 / 8 of the reducing gas flow rate during normal production. Finally, the iron content of the nano-scale superfine iron powder is 99.4%, the average particle size of the particles is about 0.8 μm, and the reduction yield is 99.3%.

Embodiment 2

[0028] Fe in raw material recycled iron red 2 o 3 The content is 98.5%, the particle size range is 0.5-10 μm, and the average particle size is 2.5 μm. The rotation speed of the spiral blade is 10r / min, and the CO flow rate of the reducing gas is 0.5m 3 / min, the reducing gas inlet pressure is controlled at 0.4MPa, the reducing temperature is 260°C, and the reaction time is 40min. The protective gas is nitrogen, and the flow rate is controlled at 1 / 10 of the reducing gas flow rate during normal production. Finally, the iron content of the nano-scale superfine iron powder is 98.8%, the average particle size of the particles is about 0.83 μm, and the reduction yield is 99.0%.

Embodiment 3

[0030] Fe in raw material recycled iron red 2 o 3 The content is 98.0%, the particle size range is 0.5-10 μm, and the average particle size is 1 μm. The rotating speed of the spiral blade is 2r / min, the reducing gas H 2 The flow rate is 0.2m 3 / min, the reducing gas inlet pressure is controlled at 0.2MPa, the reducing temperature is 600°C, and the reaction time is 15min. The protective gas is nitrogen, and the flow rate is controlled at 1 / 5 of the reducing gas flow rate during normal production. Finally, the iron content of the nano-scale superfine iron powder is 98.4%, the average particle size of the particles is about 0.81 μm, and the reduction yield is 99.1%.

[0031] The final product prepared by the present invention is micron-sized ultra-fine iron powder, the degree of reduction of which is over 99%, and its microscopic shape and particle size are relatively uniform, and the average particle size can be controlled within the range of 0.5-10 μm according to requireme...

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Abstract

The invention provides a method and device for producing micron-sized superfine iron powder through regenerative iron red. The method includes the steps that protective gas is injected into a reduction furnace tube, the regenerative iron red recovered in the cold rolling and acid pickling processes serves as a raw material, reducing gas is injected in the reverse direction after the raw material is conveyed to the reduction furnace tube, the raw material and the gas make sufficient contact at the heating section in the reduction furnace tube by rotating spiral blades in the reduction furnace tube, and the regenerative iron red is reduced to micron-sized superfine Fe, and Fe is output and stored through an airflow classifier after reaction. The produced micron-sized superfine iron powder is good in performance, control is easy, continuous production can be achieved, and the device is simple in structure and low in cost.

Description

technical field [0001] The invention belongs to the field of metallurgical powder making, and specifically refers to a method and a device for preparing micron-sized ultrafine iron powder by using regenerated iron red. Background technique [0002] Generally, the particle size of the powder is less than 10 μm and greater than 1 μm is called low micron ultrafine powder; the particle size is less than 1 μm and greater than 0.1 μm is called submicron ultrafine powder, both of which belong to micron ultrafine powder. Generally speaking, the ideal micron-sized ultrafine powder should have the following characteristics: (1) The particle size of the powder should meet the requirements of specific application performance; (2) The particle size distribution of the powder is narrow; (3) No aggregation; (4) Oxygen-containing The amount is low and the chemical composition is uniform. Due to the change of volume and surface area of ​​micron-sized ultrafine iron powder, it will produce o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00
Inventor 焦立新汪平刚华洲连李攀汪晖杨玉王爱华肖一坦
Owner 武汉钢铁有限公司
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