CN105347809A - High-performance converter steel-tapping hole gunning material - Google Patents
High-performance converter steel-tapping hole gunning material Download PDFInfo
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- CN105347809A CN105347809A CN201410411820.XA CN201410411820A CN105347809A CN 105347809 A CN105347809 A CN 105347809A CN 201410411820 A CN201410411820 A CN 201410411820A CN 105347809 A CN105347809 A CN 105347809A
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- tapping hole
- converter steel
- gunning
- steel
- gunning refractory
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Abstract
The present invention relates to a high-performance converter steel-tapping hole gunning material, which is characterized by comprising 70-80% of magnesia, 3-5% of phosphate, 1-5% of slaked lime, 5-10% of clay, 3-5% of silica micro-powder, 1-3% of chrome green, and 1-4% of a sintering agent. According to the present invention, the high-performance converter steel-tapping hole gunning material is used for carrying out gunning maintenance on the converter steel-tapping hole and the seriously-damaged parts (loading area), and has advantages of high bulk density, low water addition amount, rapid sintering, high adhesion rate, and long service life.
Description
Technical field
The present invention relates to Gunning refractory technology field, particularly relate to a kind of high-effect Gunning refractory of converter tap hole.
Background technology
At present, steel-making converter all adopts spray repair maintenance technology, because the converter smelting time is short, tapping is encased in general less than 40 minutes from molten iron, this just requires that backup lining brick, tap hole brick life cycle are long, replacing number of times is few, and converter gunning in the past mainly uses magnesia, rhombspar etc. as aggregate, be aided with the bonding agent such as phosphoric acid salt, slaked lime and additive, the shortcoming of this Gunning refractory is that volume density is low, amount of water is high, sintering time is long, adhesive rate is low, in use show as poor durability, and have a strong impact on production.Such as proportioning is medium-grade magnesite 88%, Sodium hexametaphosphate 99 4%, tripoly phosphate sodium STPP 4%, and the alkaline Gunning refractory of slaked lime 4% adds the water of 18%, is sprayed on converter taphole, could use after 30 minutes, and its volume density is 2.20g/cm
3, spray repair adhesive rate is 75%, and work-ing life is 86 stoves.
Summary of the invention
The object of the present invention is to provide the Gunning refractory of converter tap hole that a kind of long service life, volume density are high, amount of water is low, sintering is fast, adhesive rate is high, can substitute products completely.
For realizing above object, technical scheme of the present invention is a kind of high-effect Gunning refractory of converter tap hole, and its technical scheme realized is:
A kind of high-effect Gunning refractory of converter tap hole, is characterized in that the magnesia containing 70-80%, the phosphoric acid salt of 3-5%, the slaked lime of 1-5%, the clay of 5-10%, 3-5% fine silica powder, the chrome green of 1-3% and the agglutinant of 1-4%.
Wherein this magnesia is the Mg0 containing being not less than 90%, not higher than 2.1% Ca0 and not higher than 1.5% Si0
2electrosmelted magnesite clinker, because its content of magnesia is high, foreign matter content is low, so shock Qi of resistance to steel scrap, molten steel washes away, the erosion of resistance to slag.
This phosphoric acid salt is Sodium hexametaphosphate 99, tripoly phosphate sodium STPP or both mixtures, and wherein the leading indicator of Sodium hexametaphosphate 99 is P
20
5be not less than 65%, pH value is 5.5-6.5; Be bonding agent with phosphoric acid salt, make Gunning refractory have very high intensity at middle low temperature, and at high temperature generate dystectic compound with slaked lime, magnesia.Slaked lime not only has blood coagulation enhancing effect, improves the spray repair adhesive rate of Gunning refractory, but also can reduce the amount of liquid phase under high temperature, because at high temperature slaked lime and magnesia, sodium phosphate generate the compound that fusing point is 1700 DEG C; Ca (OH) in slaked lime
2be not less than 90%.
Chrome green is the fine powder that particle diameter is not more than 0.05mm, wherein Cr
20
3be not less than 90%; It adds the cohesiveness of Gunning refractory on the one hand, improves the spray repair adhesive rate of material, and at high temperature chrome green and magnesia generate magnesia chrome spinel on the other hand, improve the slag corrosion resistance of Gunning refractory.
Agglutinant of the present invention is borax or boric acid, Na in this borax
2b
40
7be not less than 90%, agglutinant add the coking property mainly increasing Gunning refractory, shorten sintering time, to come into operation in 10 minutes after spray repair at once.
The present invention also can contain the organic fibre of 0.05-1.0%, for polyethylene fibre or polypropylene fiber, organic fibre has two effects in Gunning refractory: one improves spray repair adhesive rate when being spray repair, and two is volatilizations that the pore stayed after burning is convenient to the gases such as water vapour, plays explosion-proof.
Above-mentioned raw materials is weighed in the ratio of regulation and is mixed evenly.
In the present invention, alleged per-cent is all weight percent.
The feature that Gunning refractory of converter tap hole of the present invention has long service life, volume density is high, amount of water is low, sintering is fast, adhesive rate is high.
Embodiment
The present invention is further described below by non-limiting example.
Embodiment 1. is in A steel mill, electrosmelted magnesite clinker 75% will be consisted of, Sodium hexametaphosphate 99 3.0%, slaked lime 0.6%, chrome green 1.0%, the Gunning refractory composition 500kg of clay 5%, fine silica powder 3%, borax 1% loads in spray repairing machine to add water and 10% carries out dry method spray repair, spray repair position is converter taphole and loading area, in-furnace temperature is 1OOO DEG C-1200 DEG C, and spray repair terminates within latter 2 minutes, to start by steel, and steel grade is high-carbon pyrite.This Gunning refractory volume density is 2.50g/m
3, spray repair adhesive rate is 80%, and final tap hole work-ing life is 236 stoves, is 136 hours by the steel time.
Embodiment 2. is in B steel mill, electrosmelted magnesite clinker 80% will be consisted of, Sodium hexametaphosphate 99 5.0%, slaked lime 0.7%, chrome green 1.2%, the Gunning refractory composition 400kg of clay 4%, fine silica powder 2%, borax 2% loads in spray repairing machine to add water and 12% carries out dry method spray repair, spray repair position is converter taphole and loading area, in-furnace temperature is 9OO DEG C-1100 DEG C, and spray repair terminates rear horse back by steel, and steel grade is ultra low carbon IF steel.This Gunning refractory volume density is 2.68g/m
3, spray repair adhesive rate is 85%, and final tap hole work-ing life was 208 stoves, by 120 hours steel time.
Embodiment 3. is in C steel mill, electrosmelted magnesite clinker 85% will be consisted of, Sodium hexametaphosphate 99 4.0%, slaked lime 0.8%, chrome green 1.0%, the Gunning refractory composition 600kg of clay 5%, fine silica powder 3%, borax 1% loads in spray repairing machine to add water and 13% carries out dry method spray repair, and in-furnace temperature is 11OO DEG C-1300 DEG C, spray repair position is converter taphole, and spray repair terminates latter 5 minutes by steel.This Gunning refractory volume density is 2.70g/m
3, spray repair adhesive rate is 87%, and final tap hole work-ing life was 196 stoves, by 110 hours steel time.
Claims (1)
1. a high-effect Gunning refractory of converter tap hole, is characterized in that the magnesia containing 70-80%, the phosphoric acid salt of 3-5%, the slaked lime of 1-5%, the clay of 5-10%, 3-5% fine silica powder, the chrome green of 1-3% and the agglutinant of 1-4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410411820.XA CN105347809A (en) | 2014-08-21 | 2014-08-21 | High-performance converter steel-tapping hole gunning material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410411820.XA CN105347809A (en) | 2014-08-21 | 2014-08-21 | High-performance converter steel-tapping hole gunning material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105347809A true CN105347809A (en) | 2016-02-24 |
Family
ID=55323903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410411820.XA Pending CN105347809A (en) | 2014-08-21 | 2014-08-21 | High-performance converter steel-tapping hole gunning material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105347809A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142448A (en) * | 2020-09-30 | 2020-12-29 | 湖南湘钢瑞泰科技有限公司 | Gunning mix for converter steel tapping hole and preparation method thereof |
-
2014
- 2014-08-21 CN CN201410411820.XA patent/CN105347809A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142448A (en) * | 2020-09-30 | 2020-12-29 | 湖南湘钢瑞泰科技有限公司 | Gunning mix for converter steel tapping hole and preparation method thereof |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160224 |
|
| WD01 | Invention patent application deemed withdrawn after publication |