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Device and method for removing adhering dust of raw materials for iron and steel making

A technology for attaching powder and raw materials, which is applied to chemical instruments and methods, solid separation, filtration, etc., can solve the problems of reduced average particle size of lump ore, increased ventilation resistance, and reduced productivity.

Active Publication Date: 2016-10-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the lump ore is loaded into the blast furnace in this state, the average particle size of the lump ore will decrease, and the ventilation resistance in the furnace will increase, so the productivity will decrease.

Method used

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  • Device and method for removing adhering dust of raw materials for iron and steel making
  • Device and method for removing adhering dust of raw materials for iron and steel making
  • Device and method for removing adhering dust of raw materials for iron and steel making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0063] Embodiment 1 of the present invention will be described based on the drawings.

[0064] Use of the iron-making raw material adhering powder removal device of Embodiment 1 figure 1 represents a stereogram, figure 2 The middle shows the swinging rebound type separator (swing screen) 1 of the front view.

[0065] The swing bounce type sorter is a form sorting device that uses the difference in the ballistic trajectory that bounces back on the screen due to the difference in the shape and hardness of the input. The swinging rebound type separator 1 has a mesh screen inclined at a certain angle and an eccentric drive mechanism. The screen has an inclined screen 2 and a screen stand 3 . The eccentric drive mechanism has a crankshaft 5 that is eccentric by an amount A via a bearing 4 . Use the eccentric drive mechanism to make the mesh screen rotate in the opposite direction of inclination ( figure 1 (indicated by the middle arrow), and vibrates in the up and down direct...

Embodiment 1

[0074] As an embodiment of the present invention, such as Figure 4 As shown, lump ore 10A of type A of 10 to 50 mm in size with about 10% by mass of fine iron ore 11 of 5 mm or less adhered to the surface is conveyed by belt conveyor 20, and it is thrown into a mine having a sieve opening of 10 mm. The oscillating screen 1 of the inclined screen (rubber screen) 2 collects the lump ore 10B at the end of the inclined lower side of the inclined screen 2, and collects the attached powder 11 directly under the inclined screen 2. At this time, the half amplitude of the inclined screen 2 was set to three modes of 30 mm, 45 mm, and 60 mm, and the rotation speed was set to 120 to 250 rpm.

[0075] Moreover, the lump ore (excluding the lump ore before processing) 10A and the recovered lump ore (excluding the lump ore after processing) 10B before being thrown into the vibrating screen 1 are respectively measured after drying through a sieve with a sieve opening of 5 mm. The amount of f...

Embodiment 2

[0080] Example 2 of the present invention is shown. The method for removing the attached powder is the same as in Example 1, but the lump ore uses another type B (the first embodiment is type A). As the lump ore type B to be supplied, a type in which fine particles of 5 mm or less adhered to about 10% was used.

[0081] The half amplitude of the mesh screen was set to three modes of 30, 45, and 60 mm, and the rotation speed was set to 120 to 250 rpm.

[0082] Figure 7 , 8 The remaining ratio of the attached powder in the examples is shown.

[0083] From Figure 7 It can be seen that, similarly to Example 1, there is a rotational speed region in which the proportion of remaining powder adhered to the smallest value exists in each half-amplitude. in addition, Figure 8 The minimum adhering powder residual ratio is plotted for each half-amplitude. according to Figure 8 , as in Example 1, it can be said that if the half-amplitude is set in the region of 40 to 50 mm, the ...

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Abstract

A device for removing powder adhering to the surface of raw material for manufactured steel, wherein the device from removing powder adhering to raw material for manufactured steel has an inclined screen, the inclined screen vibrates at a half amplitude A and an angular velocity omega, and the angular velocity omega is (g / A)1 / 2 to (3.3 g / A)1 / 2 inclusive.

Description

technical field [0001] The present invention relates to the field of iron making, and more specifically relates to a device and a method for removing particles attached to the surface of a bulk iron making raw material for removing particles attached to the iron making raw material. Background technique [0002] Lump ore used as a blast furnace raw material is usually stored in a raw material yard in a state of being piled up in large quantities. Therefore, when it rains, the lump ore gets wet, and, for example, fine iron ore particles having a particle diameter of 5 mm or less adhere to the surface of the lump ore having a particle diameter of 5 to 50 mm. When the lump ore is charged into the blast furnace in this state, the average particle diameter of the lump ore decreases, and the ventilation resistance in the furnace increases, so that the productivity decreases. [0003] Therefore, before the lump ore is charged into the blast furnace, a pretreatment for blast furnac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00B07B1/28B07B1/46
CPCB07B1/282B07B1/42C22B1/00
Inventor 榎枝成治西名庆晃
Owner JFE STEEL CORP
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