CN101117293A - Semi-silica brick for 7.63-meter coke oven - Google Patents
Semi-silica brick for 7.63-meter coke oven Download PDFInfo
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- CN101117293A CN101117293A CNA2007100624823A CN200710062482A CN101117293A CN 101117293 A CN101117293 A CN 101117293A CN A2007100624823 A CNA2007100624823 A CN A2007100624823A CN 200710062482 A CN200710062482 A CN 200710062482A CN 101117293 A CN101117293 A CN 101117293A
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Abstract
The invention relates to the fire resistance material technical field, in particular to a half silica brick of 7.63m for coke oven, which solves the problem of unstable volume, weak rusty resistance, easy expansion and easy shrink in high temperature for long time of the prior the half silica brick which is produced by adopting pyrauxite material. The raw material formulation comprises crude bauxite cribble powder which is ranged from 8 percent to 12 percent, crude bauxite medium powder which is ranged from 44 percent to 48 percent, fire resistance clay fine powder which is ranged from 22 percent to 26 percent, silex medium powder which is ranged from 18 percent to 22 percent, potassium feldspar which is ranged from 1.9 percent to 2.1 percent and pulp which is ranged from 0.45 percent to 0.55 percent. The crude bauxite cribble powder, crude bauxite medium powder, fire resistance clay fine powder and silex medium powder are mixed into a wet roller pro rata, then potassium feldspar is mixed into and pulp is mixed after grinded for 1 to 2 minutes to get mud material after grinded from 15 to 20 minutes. The mud material is mixed to uniform and even, then gets out of the roller into a mold. The invention has the advantages of more superior rationalize index of half silica brick than the national standard, stable volume, strength acidity erosion resistance, unshrinkable function in high temperature1350 DEG C for long time, higher weight soften temperature. The invention completely coincides the demands for brick of coke oven and dry quenching coke oven.
Description
Technical field
The present invention relates to technical field of refractory materials, be specially a kind of 7.63m coke oven semisilica brick.
Background technology
Semisilica brick is half an acid refractory product between clay brick and silica brick, and generally adopting bauxitic clay, fireclay, agalmatolite and kaolin is that main raw material mixes.Show according to data, adopting agalmatolite is the semisilica brick of raw material production, with regard to the raw material chemical index, in different ore bodies, difference because of minerogentic condition, the mineral composition difference of agalmatolite is bigger, all contain iron in the general agalmatolite, potassium, sodium, oxidizing substance such as calcium and magnesium, therefore, impure more in the agalmatolite, mineralogical composition is quite complicated, and simultaneously, agalmatolite has a wide slow heat absorption paddy about 665-670 ℃, this is because due to the agalmatolite deshydroxy, can produce expansion at 1050-1080 ℃ (about 1100 ℃), it is big slightly to expand in the time of 1150 ℃, therefore adopts the semisilica brick of agalmatolite raw material production, be difficult to keep the globality of volume stability and masonry at a certain temperature, and the resistance to acid erosional competency a little less than, under long term high temperature, exist easily and shrink, the drawback that refractoriness under load is low is difficult to satisfy coke oven semisilica brick and carbon furnace, producer gas generator, the requirement of brick of upright furnace liner.
Summary of the invention
The present invention provides a kind of 7.63m coke oven semisilica brick in order to solve the existing semisilica brick that adopts the agalmatolite raw material production and to exist a little less than volume instability, the corrosion resistance and long term high temperature easily expanding down, easy problems such as contraction.
The present invention adopts following technical scheme to realize: 7.63m coke oven semisilica brick, represent with weight percent, and contain Al in the composition of raw materials
2O
3Content is powder 44-48% in the cast alumin(i)um alumina meal 8-12% of 40-60% and the cast alumin(i)um alumina, Al
2O
3Content is not less than 25% fireclay fine powder 22-26%, SiO
2Content is not less than powder 18-22% in 97.5% the silica, and other reference index of described cast alumin(i)um alumina is SiO
2≤ 50%, Fe
2O
3≤ 1.3%, TiO
2≤ 2.5%, other reference index of fireclay is SiO
2≤ 65%, Fe
2O
3≤ 1%, TiO
2≤ 1.5%, other reference index of silica is Al
2O
3≤ 0.8%, Fe
2O
3≤ 0.8%, CaO≤0.7%;
Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 60-70%, and particle size range accounts for 28-38% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 1-2%; Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 1-2%, and particle size range accounts for 69-79% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 20-30%; Described fireclay fine powder is made of three parts, and wherein the fireclay of particle size range between 1-3mm accounts for 1-2%, and particle size range accounts for 55-65% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 34-44%; Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 1-2%, and particle size range accounts for 64-74% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 24-34%; Fineness is meant the granular size of refractory raw material, particle size distribution is meant in successive, the different fineness level range, the shared weight percent of each other particle of fineness level, the particle size distribution of refractory raw material all has very big influence to the performance index such as volume density, void content, physical strength, plasticity-, firing property and stability of fire-resistant semisilica brick, applicant of the present invention through repeatedly proportioning test, comparison, analysis, draws fineness and the particle size distribution of above-mentioned 7.63m coke oven with the raw material of semisilica brick on theoretical basis;
Also comprise the potassium felspar sand and the paper pulp that accounts for the 0.45-0.55% of above-mentioned raw materials gross weight of the 1.9-2.1% that accounts for the above-mentioned raw materials gross weight in the composition of raw materials, paper pulp proportion is 1.20-1.24g/cm
3, PH is 4-5; The effect of potassium felspar sand is to carry out promoting to burn till conversion in the sintering process at the brick body, strengthens the internal structure of brick body; Paper pulp can be buied from Liaoning Linhai City Jincheng Paper Mill, Liaoning Prov. at least, can strengthen the plasticity-of brick body;
During making, powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, make pug, mix then to the pug uniformity, go out to grind, moulding gets final product, the drying after the moulding, loading of kiln, burn till, operation such as cooling is that those of ordinary skill in the art is known.
Usually, fireclay is according to physicochemical property, ore characteristic and industrial use, generally be divided into soft clay, semisoft clay, flint clay and high-alumina clay, wherein flint clay and high-alumina clay poor plasticity, particle is superfine, bad dispersibility in water, so cohesiveness is relatively poor, and soft clay and semisoft clay particle are trickle, easily disperse in water, plasticity-and cohesiveness are very strong, so fireclay of the present invention is made of the semisoft clay of 65-75% and the soft clay of 25-35%;
Powder selects for use five silica fragmentations to form in the described silica, and five silicas are meant the silica that is produced from area, Wutai Mountain, Shanxi Province, and its composition and performance index are that those of ordinary skill in the art is known.
For the paper pulp that prevents to add in the major ingredient rolls deficiency, form walk, cause the brick body after burning till to produce fusion hole, described through the uniform pug that mixes through 3 eye mesh screens screening aftershaping.
Adopt the every physical and chemical index and the national standard of prescription of the present invention and the prepared semi silica of making method to compare, as shown in the table,
| Project | Standard value | The average measured value of the present invention |
| SiO 2％ | ≥70 | ≥91 |
| Fe 2O 3％ | ≤2.5 | ≤1.1 |
| Apparent porosity % | ≤20 | ≤18 |
| Cold crushing strength N/mm 2 | ≥45 | ≥50 |
| Load softening point begins temperature ℃ | ≥1350 | 1370 |
| Refractoriness ℃ | 1580 | ≥1620 |
| Volume density Kg/dm 3 | ≥2 | ≥2.1 |
| Reversible thermal expansion % | 0.65-0.7 | ≤0.65 |
| Compressive creep %Z 5-25 Z 25 | ≤0.10 ≤0.25 | ≤0.06 ≤0.20 |
As seen from the above table, 7.63m coke oven of the present invention all is better than national standard with every physical and chemical index of semisilica brick, coke oven of the present invention with semisilica brick have volume stability, the resistance to acid erosional competency is strong, do not shrink under 1350 ℃ of the long term high temperatures, refractoriness under load meets the requirement with brick of coke oven and coke dry quenching furnace liner fully than advantages such as height.
Embodiment
Embodiment 1:
7.63m the coke oven semisilica brick is represented with weight percent, contains Al in the composition of raw materials
2O
3Content is powder 48% in 40% cast alumin(i)um alumina meal 8% and the cast alumin(i)um alumina, Al
2O
3Content is 25% fireclay fine powder 22%, SiO
2Content is powder 22% in 97.5% the silica, and powder selects for use five silica fragmentations to form in the described silica; Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 60%, and particle size range accounts for 38% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 2%; Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 1%, and particle size range accounts for 79% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 20%; Described fireclay fine powder is made of three parts, wherein the fireclay of particle size range between 1-3mm accounts for 1%, particle size range accounts for 65% between 1-0.088mm, the particle of particle size range＜0.088mm accounts for 34%, and fireclay is made of 65% semisoft clay and 35% soft clay; Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 1%, and particle size range accounts for 74% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 25%; Also comprise 1.9% the potassium felspar sand that accounts for the above-mentioned raw materials gross weight in the composition of raw materials and account for 0.45% paper pulp of above-mentioned raw materials gross weight, paper pulp proportion is 1.20g/cm
3, PH is 4;
Powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, make pug, mix then to the pug uniformity, go out to grind, get final product through 3 eye mesh screens screening aftershaping.
Embodiment 2:
7.63m the coke oven semisilica brick is represented with weight percent, contains Al in the composition of raw materials
2O
3Content is powder 44% in the cast alumin(i)um alumina meal 12% of 40-60% and the cast alumin(i)um alumina, Al
2O
3Content is not less than 25% fireclay fine powder 26%, SiO
2Content is not less than powder 18% in 97.5% the silica, and powder selects for use five silica fragmentations to form in the described silica; Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 70%, and particle size range accounts for 28% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 2%; Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 2%, and particle size range accounts for 69% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 29%; Described fireclay fine powder is made of three parts, wherein the fireclay of particle size range between 1-3mm accounts for 2%, particle size range accounts for 55% between 1-0.088mm, the particle of particle size range＜0.088mm accounts for 43%, and fireclay is made of 75% semisoft clay and 25% soft clay; Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 2%, and particle size range accounts for 64% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 34%; Also comprise 2.1% the potassium felspar sand that accounts for the above-mentioned raw materials gross weight in the composition of raw materials and account for 0.55% paper pulp of above-mentioned raw materials gross weight, paper pulp proportion is 1.24g/cm
3, PH is 5;
Powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, make pug, mix then to the pug uniformity, go out to grind, get final product through 3 eye mesh screens screening aftershaping.
Embodiment 3:
7.63m the coke oven semisilica brick is represented with weight percent, contains Al in the composition of raw materials
2O
3Content is powder 45% in the cast alumin(i)um alumina meal 10% of 40-60% and the cast alumin(i)um alumina, Al
2O
3Content is not less than 25% fireclay fine powder 25%, SiO
2Content is not less than powder 20% in 97.5% the silica, and powder selects for use five silica fragmentations to form in the described silica; Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 65%, and particle size range accounts for 34% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 1%; Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 1%, and particle size range accounts for 69% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 30%; Described fireclay fine powder is made of three parts, wherein the fireclay of particle size range between 1-3mm accounts for 1%, particle size range accounts for 60% between 1-0.088mm, the particle of particle size range＜0.088mm accounts for 39%, and fireclay is made of 65% semisoft clay and 35% soft clay; Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 1%, and particle size range accounts for 70% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 29%; Also comprise 2.0% the potassium felspar sand that accounts for the above-mentioned raw materials gross weight in the composition of raw materials and account for 0.50% paper pulp of above-mentioned raw materials gross weight, paper pulp proportion is 1.21g/cm
3, PH is 5;
Powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, make pug, mix then to the pug uniformity, go out to grind, get final product through 3 eye mesh screens screening aftershaping.
Embodiment 4:
7.63m the coke oven semisilica brick is represented with weight percent, contains Al in the composition of raw materials
2O
3Content is powder 46% in the cast alumin(i)um alumina meal 11% of 40-60% and the cast alumin(i)um alumina, Al
2O
3Content is not less than 25% fireclay fine powder 24%, SiO
2Content is not less than powder 19% in 97.5% the silica, and powder selects for use five silica fragmentations to form in the described silica; Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 68%, and particle size range accounts for 30% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 2%; Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 2%, and particle size range accounts for 70% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 28%; Described fireclay fine powder is made of three parts, wherein the fireclay of particle size range between 1-3mm accounts for 2%, particle size range accounts for 58% between 1-0.088mm, the particle of particle size range＜0.088mm accounts for 40%, and fireclay is made of 70% semisoft clay and 30% soft clay; Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 2%, and particle size range accounts for 73% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 25%; Also comprise 1.95% the potassium felspar sand that accounts for the above-mentioned raw materials gross weight in the composition of raw materials and account for 0.48% paper pulp of above-mentioned raw materials gross weight, paper pulp proportion is 1.22g/cm
3, PH is 4;
Powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, make pug, mix then to the pug uniformity, go out to grind, get final product through 3 eye mesh screens screening aftershaping.
Embodiment 5:
7.63m the coke oven semisilica brick is represented with weight percent, contains Al in the composition of raw materials
2O
3Content is powder 47% in the cast alumin(i)um alumina meal 9% of 40-60% and the cast alumin(i)um alumina, Al
2O
3Content is not less than 25% fireclay fine powder 23%, SiO
2Content is not less than powder 21% in 97.5% the silica, and powder selects for use five silica fragmentations to form in the described silica; Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 62%, and particle size range accounts for 37% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 1%; Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 1%, and particle size range accounts for 75% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 24%; Described fireclay fine powder is made of three parts, wherein the fireclay of particle size range between 1-3mm accounts for 1%, particle size range accounts for 55% between 1-0.088mm, the particle of particle size range＜0.088mm accounts for 44%, and fireclay is made of 68% semisoft clay and 32% soft clay; Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 1%, and particle size range accounts for 68% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 31%; Also comprise 2.05% the potassium felspar sand that accounts for the above-mentioned raw materials gross weight in the composition of raw materials and account for 0.53% paper pulp of above-mentioned raw materials gross weight, paper pulp proportion is 1.24g/cm
3, PH is 5;
Powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, make pug, mix then to the pug uniformity, go out to grind, get final product through 3 eye mesh screens screening aftershaping.
Claims (4)
1. a 7.63m coke oven semisilica brick is characterized in that: represent with weight percent, contain Al in the composition of raw materials
2O
3Content is powder 44-48% in the cast alumin(i)um alumina meal 8-12% of 40-60% and the cast alumin(i)um alumina, Al
2O
3Content is not less than 25% fireclay fine powder 22-26%, SiO
2Content is not less than powder 18-22% in 97.5% the silica,
Described cast alumin(i)um alumina meal is made of three parts, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 60-70%, and particle size range accounts for 28-38% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 1-2%;
Powder is made of three parts in the described cast alumin(i)um alumina, and wherein the cast alumin(i)um alumina of particle size range between 1-3mm accounts for 1-2%, and particle size range accounts for 69-79% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 20-30%;
Described fireclay fine powder is made of three parts, and wherein the fireclay of particle size range between 1-3mm accounts for 1-2%, and particle size range accounts for 55-65% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 34-44%;
Powder is made of three parts in the described silica, and wherein the silica of particle size range between 1-3mm accounts for 1-2%, and particle size range accounts for 64-74% between 1-0.088mm, and the particle of particle size range＜0.088mm accounts for 24-34%;
Also comprise the potassium felspar sand and the paper pulp that accounts for the 0.45-0.55% of above-mentioned raw materials gross weight of the 1.9-2.1% that accounts for the above-mentioned raw materials gross weight in the composition of raw materials, paper pulp proportion is 1.20-1.24g/cm
3, PH is 4-5;
Powder in powder, fireclay fine powder and the silica in cast alumin(i)um alumina meal, the cast alumin(i)um alumina is added in wet the stone roller according to the above ratio, add potassium felspar sand again, roll after 1-2 minute and add paper pulp, rolled 15-20 minute, and made pug, mix then to the pug uniformity, go out to grind, moulding gets final product.
2. 7.63m coke oven semisilica brick according to claim 1 is characterized in that described fireclay is made of the semisoft clay of 65-75% and the soft clay of 25-35%.
3. 7.63m coke oven semisilica brick according to claim 1 and 2 is characterized in that powder selects for use five silica fragmentations to form in the described silica.
4. 7.63m coke oven semisilica brick according to claim 1 and 2 is characterized in that through the uniform pug that mixes through 3 eye mesh screens screening aftershaping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100624823A CN100457686C (en) | 2007-07-18 | 2007-07-18 | Semi-silica brick for 7.63-meter coke oven |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100624823A CN100457686C (en) | 2007-07-18 | 2007-07-18 | Semi-silica brick for 7.63-meter coke oven |
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| Publication Number | Publication Date |
|---|---|
| CN101117293A true CN101117293A (en) | 2008-02-06 |
| CN100457686C CN100457686C (en) | 2009-02-04 |
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| CN101492301B (en) * | 2009-01-15 | 2012-02-01 | 范圣良 | High-strength compact silicon mullite brick and manufacturing method thereof |
| CN102557684A (en) * | 2011-12-26 | 2012-07-11 | 山西盂县西小坪耐火材料有限公司 | Silica brick for coke oven |
| CN102964136A (en) * | 2012-11-23 | 2013-03-13 | 山东鲁阳股份有限公司 | Method for producing lightweight heat insulation bricks by utilizing natural raw materials, namely pyrophillite and cyanite |
| CN102992784A (en) * | 2012-11-15 | 2013-03-27 | 中钢集团耐火材料有限公司 | Homogeneous same-phase silica mud for large coke oven |
| CN105036779A (en) * | 2015-09-10 | 2015-11-11 | 中钢集团耐火材料有限公司 | Preparation method of silica bricks for hot blast stove |
| CN107827446A (en) * | 2017-11-29 | 2018-03-23 | 山西盂县西小坪耐火材料有限公司 | 6.25M coke oven clay bricks |
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| CN101492301B (en) * | 2009-01-15 | 2012-02-01 | 范圣良 | High-strength compact silicon mullite brick and manufacturing method thereof |
| CN102557684A (en) * | 2011-12-26 | 2012-07-11 | 山西盂县西小坪耐火材料有限公司 | Silica brick for coke oven |
| CN102992784A (en) * | 2012-11-15 | 2013-03-27 | 中钢集团耐火材料有限公司 | Homogeneous same-phase silica mud for large coke oven |
| CN102992784B (en) * | 2012-11-15 | 2014-09-24 | 中钢集团耐火材料有限公司 | Homogeneous same-phase silica mud for large coke oven |
| CN102964136A (en) * | 2012-11-23 | 2013-03-13 | 山东鲁阳股份有限公司 | Method for producing lightweight heat insulation bricks by utilizing natural raw materials, namely pyrophillite and cyanite |
| CN105036779A (en) * | 2015-09-10 | 2015-11-11 | 中钢集团耐火材料有限公司 | Preparation method of silica bricks for hot blast stove |
| CN107827446A (en) * | 2017-11-29 | 2018-03-23 | 山西盂县西小坪耐火材料有限公司 | 6.25M coke oven clay bricks |
| CN108975885A (en) * | 2018-08-27 | 2018-12-11 | 湖州德海新型建材有限公司 | It is a kind of non-aging to lay bricks and production method |
| CN111574191A (en) * | 2020-05-25 | 2020-08-25 | 郑州宏瑞耐火材料有限公司 | Semi-silica brick for multi-electrode magnesium electrolytic cell and preparation process thereof |
| CN114262234A (en) * | 2021-12-31 | 2022-04-01 | 洛阳安耐克科技股份有限公司 | Ultra-dense silica brick for blast furnace and hot blast stove and preparation method thereof |
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| CN100457686C (en) | 2009-02-04 |
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