CN106242542A - Mullite composite refractory brick and its preparation method and application - Google Patents
Mullite composite refractory brick and its preparation method and application Download PDFInfo
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- CN106242542A CN106242542A CN201610577587.1A CN201610577587A CN106242542A CN 106242542 A CN106242542 A CN 106242542A CN 201610577587 A CN201610577587 A CN 201610577587A CN 106242542 A CN106242542 A CN 106242542A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/06—Composite bricks or blocks, e.g. panels, modules
- F27D1/063—Individual composite bricks or blocks
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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Abstract
The present invention provides a kind of mullite composite refractory brick, including major ingredient and additive, described major ingredient includes the raw material of following mass percent: bauxite bulky grain 5%～15%, mullite bulky grain 15%～30%, the little granule of sillimanite 10%～20%, the little granule of mullite 10%～30%, Kaolin micropowder 5%～15%, mullite fine powder 15%～35%；The quality of described additive is the 4.5%～5.5% of described major ingredient quality.The present invention also provides for the preparation method and application of a kind of above-mentioned mullite composite refractory brick.The collocation of described mullite composite refractory brick composition rationally and has good thermal shock resistance, preferable heat stability and higher refractoriness under load, thus improves the carbon baking furnace service life applying described mullite composite fire brick masonry flue wall.
Description
Technical field
The invention belongs to technical field of refractory materials, specifically, relate to a kind of mullite composite refractory brick and system thereof
Preparation Method and application.
Background technology
In modern carbon element industry, producing anode block with roaster the most universal, the main of carbon baking furnace is appointed
Business is roasting electrolytic aluminum anode carbon block.The baking furnace flame path wall of prior art is built by laying bricks or stones by clay brick and is formed, and fuel is in quirk
Burn, and transferred heat to the anode block closing in hopper by top load andalusite composite fire brick, sun
The roasting in the atmosphere not contacting flame of pole carbon block.So, refractory material in anode-baking furnace except to stand long-term height
Outside temperature, high pressure, still suffering from periodic variations in temperature, therefore, the requirement to refractory material is that high temperature creep rate is low, and loading is soft
Change temperature thermal shock resistance high, reasonable.
And on the market that China is current, although Refractory material for carbon furnace produces the most universal, but, no matter
Be fireclay refractory or high alumina refractories or general creep refractory material all to there is load softening point the highest, hot
The shortcomings such as shake poor stability, long-time use creep rate are big, can cause the appearance deformation that flue wall is too early, damage, anode block
Production is greatly affected.
In order to solve with present on problem, people are seeking a kind of preferably technical solution always.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, thus provide a kind of and there is higher thermal shock resistance, higher
The mullite composite refractory brick of refractoriness under load and preferable heat stability.
To achieve these goals, the technical solution adopted in the present invention is: include major ingredient and additive, described major ingredient bag
Include the raw material of following mass percent: bauxite bulky grain 5%～15%, mullite bulky grain 15%～30%, sillimanite are little
Granule 10%～20%, the little granule of mullite 10%～30%, Kaolin micropowder 5%～15%, mullite fine powder 15%～35%；Described add
Add quality is described major ingredient quality the 4.5%～5.5% of agent.
Based on above-mentioned, described major ingredient includes the raw material of following mass percent: bauxite bulky grain 10%, mullite
The little granule of bulky grain 21%, sillimanite 14%, the little granule of mullite 15%, Kaolin micropowder 8%, mullite fine powder 32%.
Based on above-mentioned, the oarse-grained granularity of described bauxite is 1 mm～3 mm；The oarse-grained grain of described mullite
Degree is 1 mm～3 mm.
Based on above-mentioned, the short grained granularity of described mullite is less than 1 mm；The short grained granularity of described sillimanite is less than 1
mm。
Based on above-mentioned, the granularity of described Kaolin micropowder is less than less than 0.043 mm, the granularity of described mullite fine powder
0.074 mm。
Based on above-mentioned, described additive is pulp-water.
Wherein, described major ingredient includes aggregate and fines, and described mullite composite refractory brick is with the bauxite in raw material
Bulky grain, mullite bulky grain, the little granule of sillimanite, the little granule of mullite are aggregate, with Kaolin micropowder, mullite fine powder are
Fines, is mixed by described additive.
The present invention also provides for the preparation method of a kind of described mullite composite refractory brick, comprises the following steps:
(1) calculate according to above-mentioned mass percent, by bauxite bulky grain, mullite bulky grain, the little granule of sillimanite, not
Carry out the little granule of stone and additive carries out mixed grind and prepares prefabricated pug；Then in described prefabricated pug, add Kaolin micropowder, not
Carry out stone fine powder and carry out mixed grind and prepare mixed grind pug；
(2) described mixed grind pug is pressed into adobe, after the calcining of described adobe drying, prepares described mullite composite refractory brick.
Based on above-mentioned, described step (2) including: described mixed grind pug is pressed into adobe, by described adobe in temperature is
24 hours～36 hours it are dried under the conditions of 60 DEG C～130 DEG C；Then by dried described adobe at 1450 DEG C～1480
Carry out at a temperature of DEG C calcining 10 hours～24 hours, thus prepare described mullite composite refractory brick.
The present invention also provides for the application of a kind of above-mentioned mullite composite refractory brick, and described mullite composite refractory brick is applied to
In carbon baking furnace.
In mullite composite refractory brick raw material provided by the present invention, the performance effect of each composition is as follows:
Sillimanite: sillimanite is also silimanite or sillimanite, it is a kind of brown, light green color, light blue or white glassy
Silicate mineral, is mainly composed of silicon oxide and aluminium oxide.The crystal of sillimanite is column or needle-like, and these crystal are aggregated in one
Often rise in fibrous or radial, there is gloss or the glassy lustre of silk.Become mullite after sillimanite heating, be used as height
Level refractory material.
Andalusite: crystal belongs to the nesosilicate mineral of orthogonal (tiltedly side) crystallographic system, and andalusite is at adobe calcination process
Middle irreversible crystal transformation can be occurred to be formed there is the mullite of good mullite network, thus make it have 1800 DEG C with
On fire resistance, and resistance to suddenly cold and hot, mechanical strength are big, heat shock resistance power and resistance to slag is strong, loading inversion point is high, and have
High chemical stability and extremely strong resistance to chemical corrosion, so that the described mullite composite refractory brick of preparation has height
Lotus creep soft, low, high thermal shock stability.
Kaolin: Kaolin belongs to 1:1 type phyllosilicate, crystal is mainly by silicon-oxy tetrahedron and aluminum hydrogen-oxygen octahedron group
Become, there is strong acid resistance and the flashback performance more than 1700 DEG C thus add described the anti-of mullite composite refractory brick and forge
Burning property, Kaolin is combined the pug formed and has higher plasticity with water so that the described adobe of preparation has preferably one-tenth
Type.
Bauxite: referring to bauxite mineral material after calcining, it is mainly composed of diaspore and high alumina silicon
Stone, has higher flashback performance, is commonly used to prepare various high-alumina brick, is that metallurgical industry is widely used fire-resistant with other industry
Or anti-corrosion material.
Mullite: be a series of aluminosilicate composition mineral be referred to as, have high temperature resistant, intensity high thermal conductivity coefficient is little, joint
The features such as energy effect is notable, it is adaptable to oil splits Jie's stove, metallurgical air stove, ceramic roller kiln, tunnel cave, electroceramics shuttle kiln, glass
Glass pot furnace and the liner of various electric furnace, can directly contact flame.
Hinge structure of the present invention has prominent substantive distinguishing features and significantly progress, and specifically, the present invention will
Varigrained bauxite bulky grain, mullite bulky grain, the little granule of sillimanite, the little granule of mullite, Kaolin micropowder,
Mullite fine powder and additive mix so that the collocation of each site component proportioning of the adobe of preparation is consistent, it is ensured that calcining
The concordance of mullite composite refractory brick each position performance of gained, simultaneously containing the granularity material that a large amount of corner angle are prominent in raw material,
Increase critical granularity, provide firm framing structure for mullite composite refractory brick and make it in use be not likely to produce
Deformation.Meanwhile, bauxite bulky grain, mullite bulky grain, the little granule of sillimanite, the little granule of mullite, height it are utilized respectively
Ridge soil micropowder, the resistance to burning characteristic of mullite fine powder and preferably mouldability and sillimanite have heat resistanceheat resistant punching what calcination process was formed
Hit power, resistance to slag is strong, loading inversion point is high mullite so that the mullite composite refractory brick of preparation has high RUL, low compacted
Change, high thermal shock stability, thus improve and apply the carbon baking furnace of described mullite composite fire brick masonry flue wall to use
Life-span.And the raw material that the method uses is easy to get, composition collocation is reasonable, preparation process is simple.
Detailed description of the invention
Below by detailed description of the invention, technical scheme is described in further detail.
Embodiment 1
The present embodiment provides a kind of mullite composite refractory brick, and it includes aggregate, fines and pulp-water, wherein, described pulp-water
Quality be described aggregate and the 4.5% of described fines gross mass；Described aggregate and described fines include following mass percent
Raw material: bauxite bulky grain 10%, mullite bulky grain 21%, the little granule of sillimanite 14%, the little granule of mullite 15%, kaolinite
Soil micropowder 8%, mullite fine powder 32%.
Wherein, the oarse-grained granularity of described bauxite is 1 mm～3 mm, the oarse-grained granularity of described mullite are 1
Mm～3 mm, the short grained granularity of described mullite are less than 1 mm, described less than 1 mm, the short grained granularity of described sillimanite
The granularity of the Kaolin micropowder granularity less than 0.043 mm, described mullite fine powder is less than 0.074 mm.Chemistry in each raw material
Composition is as shown in table 1.
Table 1, each raw material main chemical compositions
| Raw material | Al2O3 | Fe2O3 | K2O+NaO | Loss on ignition | SiO2 |
| The little granule of sillimanite | 55%～58% | ≤1.1% | ≤1.0% | -- | -- |
| Bauxite bulky grain | ≥80% | ≤1.5% | ≤0.6% | -- | -- |
| Kaolin micropowder | 32%～36% | ≤1.0% | ≤1.0% | 11%～13% | -- |
| Mullite bulky grain, little granule, fine powder | 67%～72% | ≤1.0% | ≤0.4% | -- | -- |
The present embodiment also provides for the preparation method of a kind of described mullite composite refractory brick, and concrete preparation process includes:
Respectively bauxite, mullite, sillimanite, Kaolin are carried out pulverizing the raw material of prepared above-mentioned granularity.
By little to the described bauxite bulky grain of above-mentioned mass percent, described mullite bulky grain, described sillimanite
Granule, the little granule of described mullite and described pulp-water carry out mixed grind 3 minutes～5 minutes and prepare prefabricated pug；Then to described
Add described Kaolin micropowder in prefabricated pug, described mullite fine powder carries out mixed grind 10 minutes～20 minutes, prepares mixed grind mud
Material；
Use the pressure tonnage brickmaking machine more than 315 tons that described mixed grind pug is pressed into adobe, then described adobe is put into
Being dried in tunnel type drying hole 24 hours, the inlet temperature wherein controlling described tunnel type drying hole is 60 DEG C, outlet temperature
Degree is 130 DEG C；Dried described adobe is loaded in fuel gas tunnel kiln and carries out calcining at a temperature of 1480 DEG C 10 hours, from
And prepare described mullite composite refractory brick.After testing, the described mullite composite refractory brick density that the present embodiment prepares is
2.41 g/cm3。
Mullite composite refractory brick prepared by the preparation method provided by the present embodiment, can be applicable to build carbon baking furnace by laying bricks or stones
Flue wall.
Embodiment 2
The present embodiment provides a kind of mullite composite refractory brick, and concrete material composition is roughly the same with embodiment 1, and difference exists
In, in the present embodiment, the quality of described pulp-water is described aggregate and the 5% of described fines gross mass, described aggregate and described carefully
Material includes the raw material of following mass percent: bauxite bulky grain 5%, mullite bulky grain 26%, the little granule of sillimanite
10%, the little granule of mullite 19%, Kaolin micropowder 5%, mullite fine powder 35%.
The preparation method of the mullite composite refractory brick described in the present embodiment and the substantially phase of the preparation method in embodiment 1
With, difference is: described mixed grind pug is pressed into adobe, then described adobe is put in tunnel type drying hole and carries out
Be dried 30 hours, wherein control the inlet temperature of described tunnel type drying hole be 60 DEG C, outlet temperature be 130 DEG C；Will be dried
Described adobe load in fuel gas tunnel kiln and carry out calcining 12 hours at a temperature of 1470 DEG C；Thus it is multiple to prepare described mullite
Close refractory brick.After testing, the described mullite composite refractory brick density that the present embodiment prepares is 2.39 g/cm3。
Mullite composite refractory brick prepared by the preparation method provided by the present embodiment, can be applicable to build carbon baking furnace by laying bricks or stones
Flue wall.
Embodiment 3
The present embodiment provides a kind of mullite composite refractory brick, and concrete material composition is roughly the same with embodiment 1, and difference exists
In, in the present embodiment, the quality of described pulp-water is described aggregate and the 5.5% of described fines gross mass, described aggregate and described
Fines includes the raw material of following mass percent: bauxite bulky grain 15%, mullite bulky grain 16%, the little granule of sillimanite
10%, the little granule of mullite 19%, Kaolin micropowder 6%, mullite fine powder 34%.
The preparation method of the mullite composite refractory brick described in the present embodiment and the substantially phase of the preparation method in embodiment 1
With, difference is: described mixed grind pug is pressed into adobe, then described adobe is put in tunnel type drying hole and carries out
Be dried 24 hours, wherein control the inlet temperature of described tunnel type drying hole be 60 DEG C, outlet temperature be 130 DEG C；Then will be dry
Adobe after dry carries out calcining 20 hours at a temperature of 1450 DEG C, thus prepares described mullite composite refractory brick.After testing,
The described mullite composite refractory brick density that the present embodiment prepares is 2.42 g/cm3。
Mullite composite refractory brick prepared by the preparation method provided by the present embodiment, can be applicable to build carbon baking furnace by laying bricks or stones
Flue wall.
Mullite composite refractory brick performance detects: respectively in the mullite composite refractory brick to embodiment 1～3 preparation
Al2O3、Fe2O3Content, apparent porosity, cold crushing strength and 1350 DEG C of high temperature break resistant intensity performances detect, and
0.2MPa pressure, 1280 DEG C of calcinings creep rate of 25 hours and 50 hours detect, and testing result is as shown in table 2.
Table 2, mullite composite refractory brick performance detect
As can be seen from the above table: the softening point of the mullite composite refractory brick that embodiment 1～3 provides is more than 1600 DEG C, room temperature
Compressive resistance more than 60 MPa, creep rate absolute value less than 0.4%, apparent porosity between 17%～18%, coefficient of thermal expansion is less than
0.70%, the most described mullite composite refractory brick property indices meets GB/T3994-2013 set quota, described not
Carry out stone composite refractory brick and there is the high and low creep of load softening temperature, the performance of highly heatproof and shockproof, can apply to build carbon baking furnace by laying bricks or stones
Flue wall carrys out baked for producing anode block.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to preferred embodiment, and those of ordinary skill in the field are it is understood that still
The detailed description of the invention of the present invention can be modified or portion of techniques feature is carried out equivalent；Without deviating from this
The spirit of bright technical scheme, it all should be contained in the middle of the technical scheme scope that the present invention is claimed.
Claims (9)
1. a mullite composite refractory brick, including major ingredient and additive, it is characterised in that described major ingredient includes following quality hundred
The raw material of mark: bauxite bulky grain 5%～15%, mullite bulky grain 15%～30%, the little granule of sillimanite 10%～20%,
The little granule of mullite 10%～30%, Kaolin micropowder 5%～15%, mullite fine powder 15%～35%；The quality of described additive is
The 4.5%～5.5% of described major ingredient quality.
Mullite composite refractory brick the most according to claim 1, it is characterised in that described major ingredient includes following percent mass
Number raw material: bauxite bulky grain 10%, mullite bulky grain 21%, the little granule of sillimanite 14%, the little granule of mullite 15%,
Kaolin micropowder 8%, mullite fine powder 32%.
Mullite composite refractory brick the most according to claim 1 and 2, it is characterised in that described bauxite bulky grain
Granularity be 1 mm～3 mm；The oarse-grained granularity of described mullite is 1 mm～3 mm.
Mullite composite refractory brick the most according to claim 3, it is characterised in that the short grained granularity of described mullite is
Less than 1 mm；The short grained granularity of described sillimanite is less than 1 mm.
Mullite composite refractory brick the most according to claim 4, it is characterised in that the granularity of described Kaolin micropowder is less than
0.043 mm, the granularity of described mullite fine powder are less than 0.074 mm.
Mullite composite refractory brick the most according to claim 5, it is characterised in that described additive is pulp-water.
7. a preparation method for described mullite composite refractory brick, comprises the following steps:
(1) calculate, by bauxite bulky grain, not according to the raw material of the mass percent described in any one of claim 1～6
Come stone bulky grain, the little granule of sillimanite, the little granule of mullite and additive to carry out mixed grind and prepare prefabricated pug；Then to described pre-
Pug processed adds Kaolin micropowder, mullite fine powder and carries out mixed grind and prepare mixed grind pug；
(2) described mixed grind pug is pressed into adobe, after the calcining of described adobe drying, prepares described mullite composite refractory brick.
The preparation method of mullite composite refractory brick the most according to claim 7, it is characterised in that described step (2) is wrapped
Include: described mixed grind pug is pressed into adobe, described adobe is dried 24 hours under the conditions of temperature is 60 DEG C～130 DEG C
～36 hours；Then carry out dried described adobe at a temperature of 1450 DEG C～1480 DEG C calcining 10 hours～24 little
Time, thus prepare described mullite composite refractory brick.
9. the application of the mullite composite refractory brick described in an any one of claim 1～6, it is characterised in that described do not come
Stone composite refractory brick is applied in carbon baking furnace.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107089835A (en) * | 2017-05-03 | 2017-08-25 | 河南瑞泰耐火材料科技有限公司 | Carbon calciner andalusite mullite composite brick and preparation method thereof |
| CN109970459A (en) * | 2019-03-26 | 2019-07-05 | 宜兴市丁山耐火器材有限公司 | A kind of rod-like mullite high wear-resistant brick and preparation method thereof |
| CN111056851A (en) * | 2019-11-06 | 2020-04-24 | 郑州市奥达耐火材料有限公司 | Super low-porosity brick |
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| CN107089835A (en) * | 2017-05-03 | 2017-08-25 | 河南瑞泰耐火材料科技有限公司 | Carbon calciner andalusite mullite composite brick and preparation method thereof |
| CN109970459A (en) * | 2019-03-26 | 2019-07-05 | 宜兴市丁山耐火器材有限公司 | A kind of rod-like mullite high wear-resistant brick and preparation method thereof |
| CN111056851A (en) * | 2019-11-06 | 2020-04-24 | 郑州市奥达耐火材料有限公司 | Super low-porosity brick |
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