CN101591188A - RH ring streaming system refractory materials and preparation method thereof - Google Patents
RH ring streaming system refractory materials and preparation method thereof Download PDFInfo
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- CN101591188A CN101591188A CNA2009100478347A CN200910047834A CN101591188A CN 101591188 A CN101591188 A CN 101591188A CN A2009100478347 A CNA2009100478347 A CN A2009100478347A CN 200910047834 A CN200910047834 A CN 200910047834A CN 101591188 A CN101591188 A CN 101591188A
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Abstract
The present invention relates to technical field of refractory materials, relate to a kind of RH ring streaming system, adopt following weight percent raw material: magnesia 80～90% with refractory materials and preparation method thereof; Graphite 5～10%; Ai, Si, SiC, B
4At least two or more mixture 2～6% among the C; Resol 3～4% forms by following prepared: (1) takes by weighing raw material; (2) raw material mixes; (3) adopt press, green compact moulding; (4) adopt the resistance furnace drying; (5) adopt machine tool mechanical processing.The present invention compares with prior art, adopts this material to increase the erosional competency of opposing molten steel; But the improved products weave construction, the method for employing high-pressure molding, especially isostatic pressing can make the article construction even compact, can reduce brickwork joint, improves structural stability, reduces assembling procedure simultaneously; Needn't burn till by high temperature, cut down the consumption of energy, save cost, shorten the production cycle; Improved quality product and life-span, and Chrome-free can reduce public hazards.
Description
[technical field]
The present invention relates to technical field of refractory materials, relate to a kind of RH ring streaming system refractory materials and preparation method thereof.
[background technology]
The RH stove is the external refining equipment in the steel smelting procedure, and liner is made of refractory materials, and circulation system is positioned at furnace bottom, comprises circulating pipe and soaking tub, is the passage of molten steel Xun ring, by the liquid steel refining of molten steel circulation realization based on vacuum outgas.Therefore, RH ring streaming system with refractory materials to bear molten steel, slag erosion, wash away and cold and hot variation that batch operation causes.
Existing RH ring streaming system mainly adopts the magnesium chromia material with refractory materials, is main raw material with magnesia, chrome ore, synthetic magnesium chromium, process mixing-drying-burn till-process-assemble, this material technology route is long, energy consumption height, cost are also high, are difficult to prepare syphon; Mainly be that poor heat stability causes structural peeling off and influences work-ing life on structure, performance; And the public hazards that more or less exist high valence chrome to cause.
[summary of the invention]
The objective of the invention is to overcome the deficiencies in the prior art, adopt the magnesium carbonaceous material of suitable carbon source and carbon content, by the change of material, adopt the method for high-pressure molding, make the structure of product obtain improvement, needn't burn till by high temperature, just can obtain long-lived harmless product.
For achieving the above object, the present invention proposes a kind of RH ring streaming system refractory materials, it is characterized in that adopting following weight percent feedstock production to form: magnesia 80～90%; Graphite 5～10%; Ai, Si, SiC, B
4At least two or more mixture 2～6% among the C; Resol 3～4%.
A kind of RH ring streaming system preparation method of refractory materials, it is characterized in that adopting following processing step: (1) takes by weighing raw material: take by weighing raw material by above-mentioned weight percent; (2) mix: the raw material that takes by weighing is dropped in the planetary-type mixer, under 20～40 ℃ of conditions, mix 30～50 minutes one-tenth pugs, the fugitive constituent of pug≤1.2%; (3) green compact moulding: pug is put into press, with 180～250Mpa, compacting 5～15min moulding, the density 〉=3.0g/cm of green compact after the moulding
3(4) drying: green compact are adopted resistance furnace, with 200～250 ℃ of drying 18～36h, the intensity 〉=40Mpa of dry back biscuit; (5) processing: require to adopt machine tool mechanical to be processed into specified dimension according to drawing biscuit.
Described press adopts isostatic pressing machine.
The present invention compares with prior art, improved material, because the graphite that contains in the material possesses low thermal coefficient of expansion and high thermal conductivity coefficient and has improved goods thermostabilitys, composite additive and increased the hot strength of goods, thereby has increased the scouring capability of opposing molten steel; Improve the product internal structure, adopted reasonable grit grading side, can reduce void content and reduce hole diameter, thereby increased the erosional competency of opposing molten steel; Improved the product weave construction, adopted the method for high-pressure molding, especially isostatic pressing can make the article construction even compact, further makes syphon, can reduce brickwork joint, improves structural stability, reduces the processing assembling procedure simultaneously; Needn't burn till by high temperature, cut down the consumption of energy, save cost, shorten the production cycle; Not only improved quality product and work-ing life, but also because Chrome-free can reduce public hazards and improve environment.
[specific embodiment]
Embodiment
One, take by weighing following weight percent raw material:
Magnesia 87%;
Graphite 5.5%;
Ai, Si, SiC, B
4C mixture 4%;
Resol 3.5%.
Two, above-mentioned raw materials is adopted following prepared:
Mix: under 25 ℃ of conditions, drop in the planetary-type mixer and mixed 35 minutes, the fugitive constituent of pug is 1.08%.
The green compact moulding: pug is put into isostatic pressing machine, with 250Mpa, compacting 10min, the density of green compact is 3.05g/cm after the moulding
3
Dry: as green compact to be placed in the resistance furnace 220 ℃ of drying temperatures, dry 24h, the intensity 55Mpa of dry back biscuit.
Processing: require to adopt machine tool mechanical to be processed into specified dimension according to drawing biscuit.
The performance index of the goods that employing above-mentioned raw materials prescription and prepared go out are as follows:
MgO 85％
C 7％
Apparent porosity 4%
Volume density 3.02g/cm
3
Cold crushing strength 55Mpa
High temperature break resistant intensity 19MPa
The performance index of goods (representative value) are as follows with the performance index contrast of conventional articles in the present embodiment:
Invention product traditional product
MgO 85％ 65％
C 7％ /
Cr
2O
3 / 20％
Apparent porosity 4% 15%
High temperature break resistant intensity 19MPa 8Mpa
Thermostability 10 times 5 times
Claims (3)
1, a kind of RH ring streaming system refractory materials is characterized in that adopting following weight percent feedstock production to form:
Magnesia 80-90%;
Graphite 5-10%;
Ai, Si, SiC, B
4At least two kinds any mixture 2-6% among the C;
Resol 3-4%.
2, a kind of RH ring streaming system preparation method of refractory materials, it is characterized in that adopting following processing step: (1) takes by weighing raw material: take by weighing raw material by above-mentioned weight percent; (2) mix: the raw material that takes by weighing is dropped in the planetary-type mixer, mix 30-50 minute one-tenth pug, the fugitive constituent of pug≤1.2% with 20-40 ℃; (3) green compact moulding: pug is put into press, with 180-250Mpa, compacting 5～15min moulding, the density 〉=3.0g/cm of green compact after the moulding
3(4) drying: green compact are adopted resistance furnace, with 200-250 ℃ of dry 18-36 hour, the intensity 〉=40Mpa of dry back biscuit; (5) processing: adopt machine tool mechanical to process according to the drawing processing request biscuit.
3, a kind of RH ring streaming system as claimed in claim 2 is characterized in that: described press employing isostatic pressing machine with the preparation method of refractory materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100478347A CN101591188A (en) | 2009-03-19 | 2009-03-19 | RH ring streaming system refractory materials and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100478347A CN101591188A (en) | 2009-03-19 | 2009-03-19 | RH ring streaming system refractory materials and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101591188A true CN101591188A (en) | 2009-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100478347A Pending CN101591188A (en) | 2009-03-19 | 2009-03-19 | RH ring streaming system refractory materials and preparation method thereof |
Country Status (1)
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| CN (1) | CN101591188A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805190A (en) * | 2010-04-14 | 2010-08-18 | 武汉科技大学 | Furnace lining material for converter extracting vanadium and preparation method thereof |
| CN103613392A (en) * | 2013-11-08 | 2014-03-05 | 武汉钢铁(集团)公司 | Refractory lining material for RH (Ruhrstahl-Hausen) vacuum furnace, preparation method of refractory material and RH vacuum furnace |
-
2009
- 2009-03-19 CN CNA2009100478347A patent/CN101591188A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805190A (en) * | 2010-04-14 | 2010-08-18 | 武汉科技大学 | Furnace lining material for converter extracting vanadium and preparation method thereof |
| CN101805190B (en) * | 2010-04-14 | 2012-10-31 | 武汉科技大学 | Furnace lining material for converter extracting vanadium and preparation method thereof |
| CN103613392A (en) * | 2013-11-08 | 2014-03-05 | 武汉钢铁(集团)公司 | Refractory lining material for RH (Ruhrstahl-Hausen) vacuum furnace, preparation method of refractory material and RH vacuum furnace |
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Open date: 20091202 |