Integral Pouring Repair Technology for Blast Furnace Hearth
The integral pouring repair of blast furnace hearth is a new technology to quickly reconstruct the ceramic cup and safe heat transfer structure of blast furnace hearth. In the later stage of blast furnace hearth, the initial ceramic cup disappears, the carbon brick becomes thinner due to corrosion, abrasion and erosion, the heat flow intensity of the hearth heat dissipation becomes larger, and the carbon brick directly contacts with molten iron, so there is a hidden danger of iron leakage due to continuous corrosion and thinning of the carbon brick.
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Description
1. Technology Overview
The integral pouring repair of blast furnace hearth is a new technology to quickly reconstruct the ceramic cup and safe heat transfer structure of blast furnace hearth. In the later stage of blast furnace hearth, the initial ceramic cup disappears, the carbon brick becomes thinner due to corrosion, abrasion and erosion, the heat flow intensity of the hearth heat dissipation becomes larger, and the carbon brick directly contacts with molten iron, so there is a hidden danger of iron leakage due to continuous corrosion and thinning of the carbon brick.
This technology directly sprays a certain thickness of integral ceramic cup material with high temperature molten iron corrosion resistance and slag erosion resistance on the thinned carbon brick layer of the furnace cylinder, blocks the direct contact between the carbon brick and the molten iron, not only prevents the carbon dissolution, but also reduces the heat flow intensity of the furnace cylinder heat dissipation, pushes the 1150 ℃ coagulation isotherm to the inner surface of the ceramic cup, and forms a certain thickness, dynamically stable high viscosity slag iron viscous layer to protect the furnace cylinder refractory, the effect of extending its service life.
Technical Scheme for Integral Pouring Repair of 2.
◆ The materials used are developed for the furnace process environment. Among them, the sol-bonded corundum silicon carbide pumping castable has excellent resistance to slag iron erosion and high temperature erosion, and has the ability to pump and quick-drying explosion-proof performance.
◆ Construction process route: furnace cylinder cleaning → carbon brick oxidation and pulverization layer cleaning → spraying interface treatment agent → confirmation center → mold support → pumping pouring → mold removal → inspection and acceptance → appropriate heat treatment → observation and inspection → put into use.
3. technical and economic advantages
◆ The repaired furnace cylinder is a thin-walled carbon brick ceramic cup structure, and the heat transfer system of the furnace cylinder is more effective and reasonable;
The ceramic cup and carbon brick seamless bonding, to avoid the traditional ramming material shrinkage caused by the air gap and lead to the problem of increased thermal resistance;
The overall pouring ceramic cup structure is complete, to avoid the traditional masonry ceramic cup brick many hidden dangers;
◆ Local removal of serious pulverized carbon brick for local repair, can maximize the use of residual brick, reduce material consumption;
The pumping pouring construction speed is fast, and the material is quick-drying explosion-proof, usually can be completed in about a week.
4. application
Blast furnace hearth integral pouring repair technology, can be applied to the hearth to remake ceramic cup (ceramic cup wall and ceramic cup pad) integral pouring, iron mouth area pouring repair, tuyere with integral pouring (instead of tuyere combination brick) and other projects.
5. material performance index
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Hebi Zhongsheng Metallurgical Engineering Co., Ltd.
Address: 227 Hengshan Road, qibin district, Hebi City, Henan Province