A castable for a mud jacket of a blast furnace tapping hole

Abstract

The application discloses a mud sleeve castable for a blast furnace tapping hole, which comprises the following steps: a) adding a certain amount of alumina micro powder, metal silicon powder, metal aluminum powder, nano elemental silicon powder, carbon-containing resin and a binder into a mixing device, uniformly mixing and stirring to obtain mixed material A, wherein the alumina micro powder is 6-8 parts, the metal silicon powder is 2-4 parts, the metal aluminum powder is 2-4 parts, the nano elemental silicon powder is 3-6 parts, the carbon-containing resin is 10-15 parts and the binder is 1-3 parts; b) adding a certain amount of composite corundum and silicon carbide powder into the mixing device, uniformly mixing and stirring to obtain mixed material B, wherein the composite corundum is 50-60 parts and the silicon carbide powder is 20-30 parts; compared with the prior art, the mud sleeve castable can avoid on-site construction problems, avoid the iron hole area air leakage phenomenon caused by the non-dense filling of the filler, has good mixing uniformity and improves the product performance stability.

Description

[Technical Field]

[0001] This invention relates to the technical field of castables, and in particular to a mud jacket castable for blast furnace tapholes. [Background Technology]

[0002] The blast furnace taphole consists of a taphole frame, a protective plate, a brick sleeve, a mud sleeve, a flow channel, and a mud slab. Its outer end is riveted to the furnace shell, and its inner end contacts the annular carbon bricks in the hearth. The surrounding area is filled with packing material and tamped down, and is equipped with cooling walls. The taphole frame is fitted with a brick sleeve, and the outermost part of the taphole is the taphole protective plate. Inside the protective plate, a mud sleeve is tamped down to form the taphole mud sleeve.

[0003] Since on-site filling and compaction inevitably lead to certain on-site construction problems, a type of blast furnace taphole mud sleeve casting material is needed to prepare prefabricated taphole mud sleeve components for direct installation. This can effectively avoid on-site construction problems and prevent air leakage in the taphole area caused by incomplete filling.

[0004] Furthermore, since the preparation of castable refractory generally requires the use of a mixing device for uniform mixing, existing mixing devices generally only use an electric motor to drive a stirring paddle to simply stir the materials. This results in poor mixing uniformity, causing unstable product performance and affecting construction and use. [Summary of the Invention]

[0005] The purpose of this invention is to solve the problems in the prior art and to propose a mud jacket castable for blast furnace tapholes. This invention can avoid on-site construction problems, prevent air leakage in the taphole area caused by incomplete filling of the filler, and has good mixing uniformity, thus improving the stability of product performance.

[0006] To achieve the above objectives, this invention proposes a mud-sleeve casting material for blast furnace tapholes, comprising the following steps:

[0007] a) A certain amount of alumina micro powder, metallic silicon powder, metallic aluminum powder, nano-elemental silicon powder, carbon-containing resin and binder are added to a mixing device and mixed and stirred evenly to obtain mixture A. The alumina micro powder is 6-8 parts, metallic silicon powder is 2-4 parts, metallic aluminum powder is 2-4 parts, nano-elemental silicon powder is 3-6 parts, carbon-containing resin is 10-15 parts and binder is 1-3 parts.

[0008] b) Add a certain amount of composite corundum and silicon carbide powder into a mixing device, mix and stir evenly to obtain mixture B, wherein the composite corundum is 50-60 parts and the silicon carbide powder is 20-30 parts.

[0009] c) Add mixture A and mixture B into the mixing device and mix and stir evenly to obtain the finished product;

[0010] The mixing device includes a cylinder, a stirring motor, a stirring shaft, a feed port, a discharge port, a negative pressure fan, and several stirring blades. The upper and lower ends of the cylinder are respectively provided with a feed port and a discharge port. The input end of the negative pressure fan is connected to the upper end of the cylinder. The upper end of the cylinder is provided with a stirring shaft and a stirring motor that drives the stirring shaft to rotate. The stirring shaft is provided with stirring blades. The lower end of the stirring blades is provided with a cavity and a feed port connected to the cavity. The upper end of the stirring shaft is provided with an air inlet connected to the cavity. The stirring shaft is provided with a material conveying channel. One end of the material conveying channel is connected to the cavity, and the other end passes through the circumference of the stirring shaft and is not connected to the air inlet.

[0011] Preferably, the binder is an environmentally friendly binder.

[0012] Preferably, the composite corundum is composed of 20-30 parts of electrofused dense corundum with a particle size of 2-3 mm, 10-15 parts of electrofused dense corundum with a particle size of 1-2 mm, 10-20 parts of electrofused white corundum with a particle size of 1-2 mm, 8-10 parts of electrofused white corundum with a particle size of 0.1-1 mm, 20-30 parts of brown corundum with a particle size of 3-4 mm, and 40-50 parts of brown corundum with a particle size of 5-8 mm, all mixed uniformly.

[0013] Preferably, the stirring blade includes a frame, several vertical blades and several horizontal blades, the connection end of the frame to the stirring shaft is open, and the frame is provided with vertical blades and horizontal blades, which are arranged in a cross pattern.

[0014] Preferably, the upper end of the frame is provided with a main air intake channel that communicates with the air inlet, and each of the vertical blades is provided with a branch air intake channel for communicating with the main air intake channel and the cavity.

[0015] Preferably, the lower end of the feed inlet is flush with the inner bottom surface of the cylinder.

[0016] Preferably, the upper height of the feed inlet is lower than the upper height of the cavity.

[0017] Preferably, the discharge port is rectangular in shape, and the length of the discharge port is equal to the distance between the stirring shaft and the inner wall of the cylinder.

[0018] Preferably, the discharge port is provided with a support frame, the hollow part of the support frame is trapezoidal, the front end of the support frame is provided with a hinged gate, the gate is provided with a sealing body that matches the hollow part of the support frame, the two long sides of the support frame are provided with support seats, the support seats are provided with mounting seats, the mounting seats are provided with nuts, the nuts are provided with manual bolts that match them, the upper end of the manual bolts rests on the gate, and the gate is in contact with the support seats on the side corresponding to the support seats.

[0019] The beneficial effects of this invention are as follows: The castable material of this invention is processed into prefabricated taphole mud sleeves through high-pressure molding and high-temperature firing processes, which can effectively avoid construction problems, allow for direct installation of finished products, improve the sealing performance of prefabricated assemblies, and avoid air leakage in the taphole area caused by insufficient filling of the castable material. During the entire use process, there is no splashing or cross-venting at the taphole, and the prefabricated parts do not exhibit abnormal melting or pulverization. They have good corrosion resistance, and the maintenance and replacement cycle of the taphole channel is increased from once a month to once every 4 to 6 months. The furnace condition is stable. Therefore, the market prospects of the product are very promising.

[0020] By using negative pressure, the mixture at the bottom of the cylinder is extracted to the top of the cylinder, realizing the circulation of the mixture inside the cylinder, thereby improving the uniformity of the mixture.

[0021] Compared with existing technologies, it can avoid on-site construction problems, prevent air leakage in the tapping area caused by incomplete filling of the filler, and improve the uniformity of mixing, thus improving the stability of product performance.

[0022] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. [Attached Image Description]

[0023] Figure 1 This is a schematic diagram of the mixing device.

[0024] In the diagram: 1-Cylinder, 2-Agitator motor, 3-Agitator shaft, 4-Feeding port, 5-Discharge port, 6-Negative pressure fan, 7-Agitator blade, 8-Cavity, 9-Feeding port, 10-Air inlet, 11-Material conveying channel, 51-Support frame, 52-Gate, 53-Sealing body, 54-Support base, 55-Mounting base, 56-Nut, 57-Manual bolt, 71-Frame, 72-Vertical blade, 73-Horizontal blade, 74-Main air inlet channel.

Detailed Implementation Methods

[0025] Example 1

[0026] This invention relates to a mud-sleeve casting material for blast furnace tapholes, comprising the following steps:

[0027] a) A certain amount of alumina micro powder, metallic silicon powder, metallic aluminum powder, nano-elemental silicon powder, carbon-containing resin, and binder are added to a mixing device and mixed and stirred evenly to obtain mixture A. The alumina micro powder consists of 7 parts, metallic silicon powder consists of 3 parts, metallic aluminum powder consists of 3 parts, nano-elemental silicon powder consists of 5 parts, carbon-containing resin consists of 13 parts, and binder consists of 2 parts; the binder is an environmentally friendly binder.

[0028] b) A certain amount of composite corundum and silicon carbide powder are added to a mixing device and mixed and stirred evenly to obtain mixture B. The composite corundum consists of 55 parts and silicon carbide powder consists of 25 parts. The composite corundum is composed of 25 parts of fused dense corundum with a particle size of 2 mm, 12 parts of fused dense corundum with a particle size of 1 mm, 15 parts of fused white corundum with a particle size of 1 mm, 9 parts of fused white corundum with a particle size of 0.5 mm, 25 parts of brown corundum with a particle size of 4 mm, and 50 parts of brown corundum with a particle size of 6 mm, mixed evenly.

[0029] c) Add mixture A and mixture B into the mixing device and mix and stir evenly to obtain the finished product;

[0030] Example 2

[0031] This invention relates to a mud-sleeve casting material for blast furnace tapholes, comprising the following steps:

[0032] a) A certain amount of alumina micro powder, metallic silicon powder, metallic aluminum powder, nano-elemental silicon powder, carbon-containing resin, and binder are added to a mixing device and mixed and stirred evenly to obtain mixture A. The alumina micro powder consists of 6 parts, metallic silicon powder consists of 4 parts, metallic aluminum powder consists of 4 parts, nano-elemental silicon powder consists of 6 parts, carbon-containing resin consists of 15 parts, and binder consists of 3 parts; the binder is an environmentally friendly binder.

[0033] b) A certain amount of composite corundum and silicon carbide powder are added to a mixing device and mixed and stirred evenly to obtain mixture B. The composite corundum consists of 50 parts and silicon carbide powder consists of 30 parts. The composite corundum is composed of 20 parts of fused dense corundum with a particle size of 3 mm, 15 parts of fused dense corundum with a particle size of 2 mm, 10 parts of fused white corundum with a particle size of 1 mm, 10 parts of fused white corundum with a particle size of 0.1 mm, 20 parts of brown corundum with a particle size of 4 mm, and 50 parts of brown corundum with a particle size of 5 mm, mixed evenly.

[0034] c) Add mixture A and mixture B into the mixing device and mix and stir evenly to obtain the finished product;

[0035] Example 3

[0036] This invention relates to a mud-sleeve casting material for blast furnace tapholes, comprising the following steps:

[0037] a) A certain amount of alumina micro powder, metallic silicon powder, metallic aluminum powder, nano-elemental silicon powder, carbon-containing resin, and binder are added to a mixing device and mixed and stirred evenly to obtain mixture A. The alumina micro powder consists of 8 parts, metallic silicon powder consists of 2 parts, metallic aluminum powder consists of 2 parts, nano-elemental silicon powder consists of 6 parts, carbon-containing resin consists of 10 parts, and binder consists of 1 part; the binder is an environmentally friendly binder.

[0038] b) A certain amount of composite corundum and silicon carbide powder are added to a mixing device and mixed and stirred evenly to obtain mixture B. The composite corundum consists of 60 parts and silicon carbide powder consists of 20 parts. The composite corundum is composed of 20 parts of fused dense corundum with a particle size of 2 mm, 15 parts of fused dense corundum with a particle size of 1 mm, 10 parts of fused white corundum with a particle size of 2 mm, 8 parts of fused white corundum with a particle size of 0.1 mm, 30 parts of brown corundum with a particle size of 4 mm, and 50 parts of brown corundum with a particle size of 8 mm, mixed evenly.

[0039] c) Add mixture A and mixture B into the mixing device and mix and stir evenly to obtain the finished product;

[0040] See Figure 1 A mixing device includes a cylinder 1, a stirring motor 2, a stirring shaft 3, a feeding port 4, a discharging port 5, a negative pressure fan 6, and several stirring blades 7. The upper and lower ends of the cylinder 1 are respectively provided with a feeding port 4 and a discharging port 5. The input end of the negative pressure fan 6 is connected to the upper end of the cylinder 1. The upper end of the cylinder 1 is provided with a stirring shaft 3 and a stirring motor 2 that drives the stirring shaft 3 to rotate. The stirring shaft 3 is provided with stirring blades 7. The lower end of the stirring blades 7 is provided with a cavity 8 and a feeding port 9 connected to the cavity 8. The upper end of the stirring shaft 3 is provided with an air inlet 10 connected to the cavity 8. The stirring shaft 3 is provided with a material conveying channel 11. One end of the material conveying channel 11 is connected to the cavity 8, and the other end passes through the circumference of the stirring shaft 3 and is not connected to the air inlet 10.

[0041] The stirring blade 7 includes a frame 71, a plurality of vertical blades 72 and a plurality of horizontal blades 73. The connection end between the frame 71 and the stirring shaft 3 is open. The frame 71 is provided with vertical blades 72 and horizontal blades 73, which are arranged in a cross pattern.

[0042] The upper end of the frame 71 is provided with a main air intake channel 74 that communicates with the air inlet 10, and each of the vertical blades 72 is provided with a branch air intake channel 75 for communicating with the main air intake channel 74 and the cavity 8.

[0043] The lower end of the feed inlet 9 is flush with the inner bottom surface of the cylinder 1.

[0044] The upper height of the feed inlet 9 is lower than the upper height of the cavity 8.

[0045] The discharge port 5 is rectangular in shape, and the length of the discharge port 5 is equal to the distance between the stirring shaft 3 and the inner wall of the cylinder 1.

[0046] The feeding port 4 is equipped with an openable and closable cover.

[0047] The discharge port 5 is provided with a support frame 51. The hollow part of the support frame 51 is trapezoidal. The front end of the support frame 51 is provided with a hinged gate 52. The gate 52 is provided with a sealing body 53 that cooperates with the hollow part of the support frame 51. The two long sides of the support frame 51 are provided with support seats 54. The support seats 54 are provided with mounting seats 55. The mounting seats 55 are provided with nuts 56. The nuts 56 are provided with manual bolts 57 that cooperate with them. The upper end of the manual bolts 57 rests on the gate 52. The gate 52 and the support seats 54 are in contact with the support seats 54 on the corresponding sides.

[0048] The working process of this invention:

[0049] During operation, the mixing device of this invention uses a stirring motor 2 to drive a stirring shaft 3 to rotate via a gear transmission mechanism. The stirring shaft 3 then drives the stirring blades 7 to rotate, mixing the materials. Under the action of the negative pressure fan 6, the mixture at the bottom of the cylinder 1 enters the cavity 8 through the feed inlet 9 and then returns to the upper part of the cylinder 1 through the conveying channel 11.

[0050] When discharge is required, turn the manual bolt 57 downwards, and the gate 52 will move downwards to open the discharge port 5.

[0051] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A type of refractory for a blast furnace taphole, characterized in that: Includes the following steps: a) A certain amount of alumina micro powder, metallic silicon powder, metallic aluminum powder, nano-elemental silicon powder, carbon-containing resin and binder are added to a mixing device and mixed and stirred evenly to obtain mixture A. The alumina micro powder is 6-8 parts, metallic silicon powder is 2-4 parts, metallic aluminum powder is 2-4 parts, nano-elemental silicon powder is 3-6 parts, carbon-containing resin is 10-15 parts and binder is 1-3 parts. b) Add a certain amount of composite corundum and silicon carbide powder into a mixing device, mix and stir evenly to obtain mixture B, wherein the composite corundum is 50-60 parts and the silicon carbide powder is 20-30 parts; c) Add mixture A and mixture B into the mixing device and mix and stir evenly to obtain the finished product; The mixing device includes a cylinder (1), a stirring motor (2), a stirring shaft (3), a feeding port (4), a discharging port (5), a negative pressure fan (6), and several stirring blades (7). The upper and lower ends of the cylinder (1) are respectively provided with a feeding port (4) and a discharging port (5). The input end of the negative pressure fan (6) is connected to the upper end of the cylinder (1). The upper end of the cylinder (1) is provided with a stirring shaft (3) and a stirring motor (2) that drives the stirring shaft (3) to rotate. The stirring shaft (3) is provided with stirring blades (7), the lower end of the stirring blades (7) is provided with a cavity (8) and a feed inlet (9) communicating with the cavity (8), the upper end of the stirring shaft (3) is provided with an air inlet (10) communicating with the cavity (8), the stirring shaft (3) is provided with a material conveying channel (11), one end of the material conveying channel (11) is communicating with the cavity (8), and the other end passes through the circumference of the stirring shaft (3) and is not communicating with the air inlet (10).

2. The refractory for a blast furnace taphole as described in claim 1, characterized in that: The binder is an environmentally friendly binder.

3. The refractory for a blast furnace taphole as described in claim 1, characterized in that: The composite corundum is composed of 20-30 parts of electrofused dense corundum with a particle size of 2-3 mm, 10-15 parts of electrofused dense corundum with a particle size of 1-2 mm, 10-20 parts of electrofused white corundum with a particle size of 1-2 mm, 8-10 parts of electrofused white corundum with a particle size of 0.1-1 mm, 20-30 parts of brown corundum with a particle size of 3-4 mm, and 40-50 parts of brown corundum with a particle size of 5-8 mm, all mixed uniformly.

4. The refractory for a blast furnace taphole as described in claim 1, characterized in that: The stirring blade (7) includes a frame (71), a number of vertical blades (72) and a number of horizontal blades (73). The connection end between the frame (71) and the stirring shaft (3) is open. The frame (71) is provided with vertical blades (72) and horizontal blades (73), and the vertical blades (72) and horizontal blades (73) are arranged in a cross pattern.

5. The refractory for a blast furnace taphole as described in claim 4, characterized in that: The upper end of the frame (71) is provided with a main air intake channel (74) that communicates with the air inlet (10), and each of the vertical blades (72) is provided with a branch air intake channel (75) for communicating with the main air intake channel (74) and the cavity (8).

6. The refractory for a blast furnace taphole as described in claim 1, characterized in that: The lower end of the feed inlet (9) is flush with the inner bottom surface of the cylinder (1).

7. The refractory for a blast furnace taphole as described in claim 1, characterized in that: The upper height of the feed inlet (9) is lower than the upper height of the cavity (8).

8. The refractory for the taphole of a blast furnace as described in claim 1, characterized in that: The discharge port (5) is rectangular in shape, and the length of the discharge port (5) is equal to the distance between the stirring shaft (3) and the inner wall of the cylinder (1).

9. A blast furnace taphole refractory material as described in any one of claims 1 to 8, characterized in that: The discharge port (5) is provided with a support frame (51). The hollow part of the support frame (51) is trapezoidal. The front end of the support frame (51) is provided with a hinged gate (52). The gate (52) is provided with a sealing body (53) that cooperates with the hollow part of the support frame (51). The two long sides of the support frame (51) are provided with support seats (54). The support seats (54) are provided with mounting seats (55). The mounting seats (55) are provided with nuts (56). The nuts (56) are provided with manual bolts (57) that cooperate with them. The upper end of the manual bolts (57) rests on the gate (52). The gate (52) and the support seats (54) are in contact with the support seats (54) on the corresponding sides.

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