CN1218053C - Technology for making combined tapping hole - Google Patents
Technology for making combined tapping hole Download PDFInfo
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- CN1218053C CN1218053C CN 03133777 CN03133777A CN1218053C CN 1218053 C CN1218053 C CN 1218053C CN 03133777 CN03133777 CN 03133777 CN 03133777 A CN03133777 A CN 03133777A CN 1218053 C CN1218053 C CN 1218053C
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- tap hole
- liner
- work liner
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Abstract
The present invention relates to a technology for making a combined tapping hole for the steel making of a rotary furnace or an electric furnace, which comprises the combined method of a magnesium-carbon body, an operating inner liner contacting molten steel and two materials. In the concrete making technology, 0.5 to 1 part of light Al2O3-SiO2 is added to 3 to 4 parts of zirconium mullite, 2 to 3 parts of Al2O3 and 3 to 4 parts of zirconium oxide to be mixed by liquid resin and then is made into a material for the operating liner; 0.3 to 0.5 parts of metal aluminium powder and 0.02 to 0.07 part of calcium boride are added to 8 to 9 parts of large crystallizing magnesite sand and 1 to 2 parts of flake graphite to be mixed by liquid resin and then are made into a material for the body; the material for the operating liner and the material for the body are pressed into a whole through high-pressure forming. The operating inner liner of the present invention has long service life, can inhibit the oxidization of the material for the body in the operating process, enhance the spalling resistance of products, and has an obvious effect on extending the service life of a tapping hole and avoiding the fast local corrosion.
Description
Technical field: the manufacture craft that the present invention relates to crucial refractory materials-compound tap hole of using in a kind of converter and the EAF Steelmaking Process.
Technical background: present iron and steel enterprise all must use tap hole in the process of converter or Electric furnace steel making.Directly influenced the rhythm and the production efficiency of steel-making the work-ing life of tap hole, the service condition of tap hole also has very big influence to the quality of molten steel.The Sumitomo Metal Industries of the Pu item of Korea S, Japan all tend to use magnesium carbonaceous tap hole, and the tap hole of this material also generally is accepted in America and Europe's iron and steel enterprise.But the tap hole of this material can not be avoided the oxidation of graphite in baking or use, makes the material not anti-use of loosening.And because the tap hole internal-external temperature difference is big, because the thermal spalling that thermal stresses produces also happens occasionally, molten steel splashes when causing tapping, and rolls up slag, secondary oxidation of steel is serious, has reduced the quality of smelting.
Summary of the invention: in order to solve the problem of above-mentioned existence, the invention provides a kind of work liner that cooperates with the body material, the scouring capability of the anti-molten steel of this work liner is strong, and the oxic gas part in the isolated environment for use contacts with body magnesium carbon material, has avoided the oxidation of crystalline flake graphite in the material.Because the poor thermal conductivity of this material can form big thermograde, the temperature variation that body magnesium carbon material is born is little, effectively raises the spalling resistance of material simultaneously.
Concrete technical scheme is as follows: a kind of manufacture craft of compound tap hole is characterized in that: compound one deck work liner in magnesium carbonaceous body materials, and concrete manufacture craft is as follows:
1. by weight a part batching, with the zirconium mullite of 3-4 part, the Al of 2-3 part
2O
3, 3-4 part zirconium white, add the lightweight Al of 0.5-1 part
2O
3-SiO
2, with making work liner materials after the liquid resin mixing;
2. by weight a part batching, with big crystallization magnesia 8-9 part, crystalline flake graphite 1-2 part, add metallic aluminium powder 0.3-0.5 part, calcium boride 0.02-0.07 part is mixed and made into the body materials with liquid resin;
3. above-mentioned two kinds of mixed raw materials are with the reinforced method of gradation or twice method of forming, and by waiting static pressure or other molding mode moulding, working lining is work liner materials, and body is a magnesium carbon material.
Compare with existing single material, work liner and this volume recombination of the aluminium zirconium system that the present invention selects for use, the liner material is the intensity height when middle low temperature, and thermal conductivity is low, when temperature fluctuation is big, can cushion the temperature variation of body material, improve the spalling resistance of magnesium carbon material; Because this material does not contain crystalline flake graphite, and just produces liquid phase about 1200 ℃, has completely cut off the oxidation of oxidizing atmosphere to crystalline flake graphite in the body material, has prolonged the work-ing life of tap hole.
Selection to the body materials:
Body magnesium carbon material is to be body material with big crystallization magnesia and crystalline flake graphite, adds the refractory materials that oxidation inhibitor and wedding agent are made.It has fully utilized the crystalline flake graphite difficulty and has been soaked into by molten steel, slag, the difficult erosive characteristics of highly-purity magnesite.
1. magnesia
The main raw material that the big crystallization magnesia of electric smelting is tap hole.It is the skeleton in the goods.Experimental results show that MgO content is high more, resistance to fouling is strong more.Desire is produced high-quality tap hole, must select for use MgO greater than 98.5%, volume density 〉=3.55g/cm
3Big crystallization electrosmelted magnesite clinker, guarantee the erosion resistance and the intensity of goods.
2. crystalline flake graphite
Crystalline flake graphite as one of raw material of tap hole, its principal character such as fixed carbon content, granularity, and performance such as fugitive constituent directly influence the performance and the result of use of tap hole brick, the crystalline flake graphite that granularity is big, purity is high to the anti-erosion of tap hole, anti-ly peel off, resistance to oxidation all can have comprehensive improvement.
3. oxidation inhibitor
For preventing the oxidation of body magnesium carbon material, must add a certain amount of oxidation inhibitor.Oxidation inhibitor in the magnesium carbon refractory mainly contains Al, Si, B
4C etc.But experimental results show that the most effective oxidation inhibitor is Al, (Si) and CaB
6Use together.
Selection to work liner materials:
Work liner materials are to be body material with the Al-Zr material, add lightweight Al
2O
3-SiO
2The refractory materials made from wedding agent.It has utilized zirconium white and Al
2O
3Corrosion resistance is strong, lightweight Al
2O
3-SiO
2The characteristics that thermal conductivity is low.
The performance index of used liquid resin:
| Viscosity (25 ℃ of pa.s) | 3-8 |
| Moisture (%) | 2-6 |
| Carbon residue (%) | ＞40 |
| Solid content (%) | ＞75 |
| Free phenol (%) | 8-18 |
| PH value (25 ℃) | 6.8-7.6 |
Complex method:
1. place ring-like sleeve in mould in advance, at interior ring adding work liner materials, outer shroud is extracted ring-like sleeve out after adding the body materials, and extrusion forming makes compound tap hole again.(gradation feed in raw material method)
2. with the ring-like work liner of mould elder generation moulding of design in advance, the work liner after the moulding is placed in and adds the body materials in the mould again and carry out post forming and make compound
Tap hole.(post forming method)
The performance of product sees the following form:
| Index | Body | Working lining |
| MgO ％ | ≥78 | --- |
| F.C ％ | ≥14 | --- |
| Al 2O 3 ％ | ≥40 | |
| SiO 2 ％ | -- | ≤10 |
| ZrO 3 ％ | -- | ≥40 |
| Apparent porosity % | ≤3.8 | ≤18 |
| Volume density g/cm 3 | ≥2.90 | ≥2.98 |
| Cold crushing strength Mpa | ≥40 | ≥45 |
| Strength at normal temperature Mpa | ≥10.0 | ≥12.0 |
Description of drawings:
Fig. 1 is the reinforced method synoptic diagram of gradation.
Fig. 2 is the structure iron of compound tap hole.
Embodiment is as follows:
Embodiment 1: a kind of manufacture craft of compound tap hole, and compound one deck work liner 2 in magnesium carbonaceous body 1, concrete manufacture craft is as follows:
1. by weight, with 3 parts zirconium mullite, 3 parts Al
2O
3, 4 parts zirconium white, add 0.5 part lightweight Al
2O
3-SiO
2, make wedding agent with liquid resin, make work liner materials after the mixing;
2. by weight, with 8 parts in big crystallization magnesia, 2 parts of crystalline flake graphites, add 0.3 part of metallic aluminium powder, 0.04 part of calcium boride is made wedding agent with liquid resin, is mixed and made into the body materials;
3. above-mentioned two kinds of mixed raw materials adopt the mode of twice moulding, the ring-like work liner of mould elder generation's moulding with design in advance, work liner after the moulding is placed in and adds the body materials in the mould again and carry out post forming, isostatic pressing mode moulding by routine, making internal layer is work liner materials, and skin is the compound tap hole of body magnesium carbon material.
Embodiment 2: a kind of manufacture craft of compound tap hole, and compound one deck work liner 2 in magnesium carbonaceous body materials 1, concrete manufacture craft is as follows:
1. by weight, with 4 parts zirconium mullite, 2 parts Al
2O
3, 4 parts zirconium white, add 1 part lightweight Al
2O
3-SiO
2, make wedding agent with liquid resin, make the working lining materials after the mixing;
2. by weight, with 9 parts in big crystallization magnesia, 1 part of crystalline flake graphite, add 0.5 part of metallic aluminium powder, 0.06 part of calcium boride is made wedding agent with liquid resin, is mixed and made into the body materials;
3. the mode that above-mentioned two kinds of mixed raw materials feed in raw material with gradation, in inner mold 3, outer mold 4, place ring-like sleeve 5 in advance, at interior ring adding work liner materials 6, outer shroud adds body materials 7 backs and extracts ring-like sleeve out, making internal layer by conventional rubbing machine molding mode is the working lining materials, and skin is the compound tap hole of body magnesium carbon material.
Embodiment 3: a kind of manufacture craft of compound tap hole, and compound one deck work liner 2 in magnesium carbonaceous body materials 1, concrete manufacture craft is as follows:
1. by weight, with 4 parts zirconium mullite, 3 parts Al
2O
3, 3 parts zirconium white, add 0.5 part lightweight Al
2O
3-SiO
2, make wedding agent with liquid resin, make work liner materials after the mixing;
2. by weight, with 8 parts in big crystallization magnesia, 2 parts of crystalline flake graphites, add 0.4 part of metallic aluminium powder, 0.05 part of calcium boride is made wedding agent with liquid resin, is mixed and made into the body materials;
3. the mode that above-mentioned two kinds of mixed raw materials feed in raw material with gradation, in inner mold 3, outer mold 4, place ring-like sleeve 5 in advance, at interior ring adding work liner materials 6, outer shroud adds body materials 7 backs and extracts ring-like sleeve out, making internal layer by conventional rubbing machine molding mode is the working lining materials, and skin is the compound tap hole of body magnesium carbon material.
Claims (3)
1, a kind of manufacture craft of compound tap hole is characterized in that: compound one deck work liner in magnesium carbonaceous body materials, and concrete manufacture craft is as follows:
1. by weight a part batching, with the zirconium mullite of 3-4 part, the Al of 2-3 part
2O
3, 3-4 part zirconium white, add the lightweight Al of 0.5-1 part
2O
3-SiO
2, with making work liner materials after the liquid resin mixing;
2. by weight a part batching, with big crystallization magnesia 8-9 part, crystalline flake graphite 1-2 part, add metallic aluminium powder 0.3-0.5 part, calcium boride 0.02-0.07 part is mixed and made into the body materials with liquid resin;
3. above-mentioned two kinds of mixed raw materials are with reinforced method of gradation or post forming method, by isostatic pressing mode or the moulding of rubbing machine molding mode, making working lining is that the 1. made work liner materials of step are made, and body is that the 2. made body materials of step are made.
2, the manufacture craft of compound tap hole according to claim 1, it is characterized in that: the described gradation method of feeding in raw material, in mould, place ring-like sleeve in advance, at interior ring adding work liner materials, outer shroud is extracted ring-like sleeve out after adding the body materials, making internal layer by conventional rubbing machine molding mode is the working lining materials, and skin is the compound tap hole of body magnesium carbon material.
3, the manufacture craft of a kind of compound tap hole according to claim 1, it is characterized in that: described post forming method, the ring-like work liner of mould elder generation's moulding with design in advance, work liner after the moulding is placed in and adds the body materials in the mould again and carry out post forming, isostatic pressing mode moulding by routine, making internal layer is work liner materials, and skin is the compound tap hole of body magnesium carbon material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03133777 CN1218053C (en) | 2003-07-23 | 2003-07-23 | Technology for making combined tapping hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03133777 CN1218053C (en) | 2003-07-23 | 2003-07-23 | Technology for making combined tapping hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1483838A CN1483838A (en) | 2004-03-24 |
| CN1218053C true CN1218053C (en) | 2005-09-07 |
Family
ID=34154336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03133777 Expired - Fee Related CN1218053C (en) | 2003-07-23 | 2003-07-23 | Technology for making combined tapping hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1218053C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105219916B (en) * | 2015-10-20 | 2017-10-20 | 武汉钢铁(集团)公司 | High-precision control is molded composite tapping hole pipe brick and its manufacture method |
| BR112022006624A2 (en) * | 2019-10-10 | 2022-06-28 | Refractory Intellectual Property Gmbh & Co Kg | ISOSTATICALLY PRESSED PRODUCT FOR USE IN HANDLING MOLTED METAL AND PRODUCTION METHOD. |
-
2003
- 2003-07-23 CN CN 03133777 patent/CN1218053C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1483838A (en) | 2004-03-24 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20081226 Address after: Postcode of Yongan Town, Liaoning City, Dashiqiao Province: 115109 Patentee after: Dashiqiao Rongyuan Magnesite Co., Ltd. Address before: Yongan town of Dashiqiao city of Liaoning Province Rong Yuanmei mine zip code: 115109 Co-patentee before: Yang Hong Patentee before: Xie Kai Rong |
|
| ASS | Succession or assignment of patent right |
Owner name: DASHIQIAO CITY RONGYUAN MAGNESITE CO., LTD. Free format text: FORMER OWNER: XIE QIRONG Effective date: 20081226 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050907 Termination date: 20130723 |