JPH11131114A - Blast furnace charging device swing chute - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a swiveling chute excellent in wear resistance and service life for charging a blast furnace charge. SOLUTION: The surface layer of the bottom liner, side liner and side end liner of the blast furnace charging device turning chute main body has an average diameter of about 4 to 6 mm and is formed of a layer to be cast around. 3% of total liner thickness
A blast furnace charging apparatus swiveling chute in which tungsten carbide coarse particles are arranged on a surface layer of 0 to 40%, and high Cr cast iron liners formed by casting these tungsten carbide coarse particles are arranged and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the wear resistance and the service life of a blast furnace charging apparatus turning chute used when charging raw materials for producing pig iron such as iron ore, lime and coke into a blast furnace. The present invention relates to a new turning chute structure.

[0002]

2. Description of the Related Art Generally, when charging a blast furnace charge such as iron ore, lime, coke, etc. from the top of the blast furnace into the furnace, the charge falling through a vertical chute is uniformly distributed in the blast furnace body. A swiveling chute is used to charge. However, this revolving chute has a structure in which a liner for protecting the chute from abrasion due to contact between the chute main body and the charge is attached to the inner surface of the chute main body. The liner used for this revolving chute is made of high-Cr steel. However, the liner used for the revolving chute is subject to severe wear due to collision depending on the physical properties of the charge and the height of the drop. Since the bottom liner and side end liner of the turning chute are severely worn by contact and collision, their life is said to be only 3 to 4 months, and it is necessary to replace or repair the turning chute in a short cycle. This has led to higher maintenance and maintenance costs. In addition, since the swirling chute is located at the top of the blast furnace and is constantly exposed to a temperature of around 600 ° C., it is also a major cause of shortening the service life.

[0003] Therefore, as a method of improving the service life of the liner for a turning chute, a ceramic member such as sialon or a tungsten carbide (WC) carbide chip which is harder than high Cr steel and has good wear resistance is attached to the liner surface. A method of attaching is proposed.

[0004]

However, in any of the above-mentioned methods, there is no adhesive which can withstand this in an environment exposed to a temperature of around 600 ° C. in order to attach the liner to the liner body via an adhesive. There is a situation where it is peeled off in a short period of time and cannot withstand use, and there has been a demand for the development of a revolving chute combining materials that improve wear resistance and service life.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises tungsten carbide coarse particles on a surface layer of a bottom liner, a side liner and a side end liner of a turning chute main body. High cast C
This is a blast furnace charging device turning chute in which r cast iron liners are arranged and fixed. The tungsten carbide coarse particles have an average diameter of about 4 to 6 mm, and the ratio of the tungsten carbide coarse particles to the entire liner thickness of the layer to be cast is 30 to 40%. Is preferred.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a conceptual diagram of a blast furnace charging apparatus. A hopper 2 for receiving a charge such as iron ore, lime, coke and the like is provided on the top of a blast furnace main body 1 and connected to the hopper 2 to form a blast furnace main body 1. A vertical chute 3 extending vertically toward the inside is provided. Further, a swirling chute 4 for uniformly distributing the charge into the blast furnace main body 1.
Are provided immediately below the vertical chute 3 and constitute a blast furnace charging apparatus.

FIG. 2 (a) is an overall perspective view of a half portion from the center of a blast furnace charging apparatus turning chute according to the present invention. This turning chute has a turning chute length of about 5 m in the case of a blast furnace of about 3000 m ³ and has a high Cr content.
It comprises a U-shaped swing chute main body 5 made of a cast iron plate. The inside of the U-shaped revolving chute main body 5 can sufficiently withstand the side liner 7 which is less damaged by abrasion at the root even if the high Cr cast iron iron plate is exposed, but the bottom liner 6 is formed by the blast furnace charge. Abrasion-resistant liners are required because of the large damage caused by abrasion due to contact and collision. Further, the liner 8 at the side end of the U-shaped turning chute main body 5 is particularly damaged by abrasion because the blast furnace charge is exposed to contact / collision on the entire inner side. Therefore, a wear-resistant liner is particularly required. . Under such circumstances, in the present invention, the tungsten carbide coarse particles 9 having an average diameter of about 4 to 6 mm are cast in the surface layer of the bottom liner 6 and the side end liner 8 of the turning chute. Arrange high Cr cast iron liner,
The blast furnace charging device is a rotating chute that has a fixed structure so that the blast furnace charging material can sufficiently withstand contact and collision. FIG. 2B is a cross-sectional view taken along a line AA in FIG. As can be seen from FIG. 2B, the bottom liner 6 and the side end liner 8 are fixed to the inside of the U-shaped swing chute main body 5 by bolting.

In the present invention, as shown in FIG. 3, one of the bottom liner 6 and the tip side liner 8 is provided.
The size of each piece is a rectangle of about 400 mm × 400 mm, and its thickness is about 400 mm. The size of the tungsten carbide coarse particles 9 cast into the high Cr cast iron liner constituting each liner has an average diameter of about 4 to 4 as described above.
Although it has a size of 6 mm, the ratio of the thickness of the cast-in layer of the tungsten carbide coarse particles 9 to the entire liner thickness is preferably 30 to 40%. In particular, the size of the tungsten carbide coarse particles 9 has an average diameter of about 4
~ 6 mm, preferably having an average diameter of about 5 mm,
If it is larger than this, it will not be uniformly dispersed in the cast-in layer.

The blast furnace charging apparatus swivel chute having such a structure contacts the blast furnace charge. Sufficient wear resistance and service life against impact are obtained, and the same method of fixing to the swing chute as the conventional method is possible.

[0010]

As described above, the turning chute of the blast furnace charging apparatus according to the present invention casts tungsten carbide coarse particles of the optimum size for the bottom liner and the tip side liner, which are severely damaged by wear, into the high Cr cast iron liner. By disposing the liner, it is possible to extend the life of the liner by about 10 times. And liner 1
Although the cost is slightly increased in terms of the individual price, it has a remarkable effect in consideration of the life of the entire turning chute, repair of damage to the liner, and the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conceptual diagram of a blast furnace charging apparatus.

FIG. 2A is an overall perspective view of a half part from the center of a blast furnace charging apparatus turning chute according to the present invention, and FIG.
(A) sectional drawing of AA.

FIG. 3 is a perspective view of one liner according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Blast furnace main body 2 ... Hopper 3 ... Vertical chute 4 ... Revolving chute 5 ... Revolving chute main body 6 ... Bottom part liner 7 ... Side part liner 8 ... Tip side part liner 9 ... Tungsten carbide coarse grain

Claims (2)

[Claims] 1. A high carbon steel in which tungsten carbide coarse particles are cast into the surface layers of the bottom liner, side liner and side end liner of the blast furnace charging device turning chute main body.
A swing chute for a blast furnace charging device, wherein r cast iron liners are arranged and fixed. 2. The tungsten carbide coarse particles have an average diameter of about 4 to 6 mm, and the ratio of the layer where the tungsten carbide coarse particles are cast to the entire liner thickness is 30 to 40%. The blast furnace charging apparatus turning chute according to claim 1, wherein: