Unlock instant, AI-driven research and patent intelligence for your innovation.

Repair material and repair method for working layer of molten iron tank bottom

A technology for molten iron tanks and working layers, applied in the field of refractory materials, can solve the problems of limited slag penetration resistance and molten iron erosion resistance, increased risk of molten iron penetration, and low service life of castables, so as to make up for excessive damage. Avoid cracks, the effect of simple components

Active Publication Date: 2022-07-05
WUGANG REFRACTORY CO LTD
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Excavate or subsidize the bricks of the working layer in the central area. After excavation or subsidy, the service life of the tank bottom is relatively high. However, during the process of excavation or subsidy, it is difficult to avoid gaps between new bricks and old bricks, and the risk of molten iron penetration increases;
[0004] (2) Calcium aluminate cement combined with high-alumina or aluminum-silicon carbide castables is used for pouring repairs. Although it can effectively fill weak areas, the bonding force between aluminate cement-bonded castables and the original working layer bricks is limited. The material may be separated from the original brick layer during use and may float up as a whole. At the same time, due to the high content of calcium oxide in the calcium aluminate cement-bonded castable, the resistance to slag penetration and molten iron erosion is limited, which leads to the use of this castable lower lifespan

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Repair material and repair method for working layer of molten iron tank bottom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment discloses a repairing method for the bottom working layer of a spherical molten iron tank:

[0035] The method includes first cleaning up the residue in the bottom area to be repaired at the bottom of the spherical molten iron tank, and then placing a layer of rectangular aluminum silicon carbide carbon bricks in the middle of the area to be repaired at the bottom of the molten iron tank, wherein the working layer at the bottom of the molten iron tank is to be The height of the largest defect in the repair area is 300mm, and the height of the working layer formed by the rectangular aluminum silicon carbide carbon brick is selected to be 230mm in the present invention, and then the bauxite clinker is placed in the mixer and stirred evenly, and phosphoric acid solution and active lime are added, and each The mass percentage content of the raw materials is as follows: bauxite clinker: 89%, phosphoric acid solution: 10%, active lime: 1%, and stir for 3 minute...

Embodiment 2

[0037] This embodiment discloses a repairing method for the bottom working layer of a spherical molten iron tank:

[0038]The method includes first cleaning up the residue in the bottom area of ​​the spheroidal molten iron tank to be repaired, and then placing a layer of rectangular high-alumina bricks in the middle of the area to be repaired at the bottom of the molten iron tank, wherein the area to be repaired at the bottom of the molten iron tank The height of the largest defect site is 350mm, and the height of the working layer formed by the rectangular high-alumina brick is selected to be 230mm in the present invention. Then, the regenerated corundum material is placed in a mixer and stirred evenly, and phosphoric acid solution and active lime are added, and the mass percentage content of each raw material is As follows: regenerated corundum material: 83%, phosphoric acid solution: 15%, active lime: 2%, stirred for 3 minutes to obtain the castable; wherein, the regenerated...

Embodiment 3

[0040] This embodiment discloses a repairing method for the bottom working layer of a spherical molten iron tank:

[0041] The method includes first cleaning up the residue in the bottom area of ​​the spheroidal molten iron tank to be repaired, and then placing a layer of rectangular high-alumina bricks in the middle of the area to be repaired at the bottom of the molten iron tank, wherein the area to be repaired at the bottom of the molten iron tank The height of the largest defective part is 300mm, and the height of the working layer formed by the rectangular high-alumina brick is selected to be 180mm in the present invention, and then the regenerated high-alumina material is placed in a mixer and stirred evenly, and phosphoric acid solution and active lime are continued to be added, and the mass percentage of each raw material is The content is as follows: recycled high alumina material: 89%, phosphoric acid solution: 8%, active lime: 3%. The castable was prepared by stirri...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a repairing material and a repairing method for a bottom working layer of a molten iron tank, and belongs to the technical field of refractory materials. The repairing material is mainly composed of repairing bricks and castables used to bond the repairing bricks with the working layer bricks at the bottom of the molten iron tank. The mass percentage content of alumina in the silicon carbon brick is not less than 40%, the castable is made of high alumina material, phosphoric acid solution and active lime, and the mass percentage content of alumina in the high alumina material is greater than or equal to 55%. By placing repairing bricks in the middle of the area to be repaired on the bottom working layer of the molten iron tank, and coating enough castables around the repairing bricks, the average service life of the molten iron tank after repairing is over 320 furnaces.

Description

technical field [0001] The invention relates to a repairing method for a metallurgical molten iron tank, belongs to the technical field of refractory materials, and in particular relates to a repairing material and a repairing method for the bottom working layer of a molten iron tank. Background technique [0002] In the iron and steel metallurgy industry, the molten iron tank is an important equipment for the transportation of molten iron, which has the characteristics of long service life. The bottom shape of the molten iron tank mainly has two types: flat bottom and spherical bottom. The spherical molten iron tank is subjected to concentrated impact of molten iron and concentrated infiltration of residual iron during long-term use. The damage speed is much higher than that of other parts, so that the part must be repaired during the use process to meet the long-term use requirements of the molten iron tank. Usually the fix is ​​as follows: [0003] (1) The working layer...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66B22D41/02
CPCC04B35/66B22D41/023Y02P10/20
Inventor 徐志华刘毅周辉
Owner WUGANG REFRACTORY CO LTD