CN108002849A - Refractory brick containing magnesia and preparation method thereof - Google Patents
Refractory brick containing magnesia and preparation method thereof Download PDFInfo
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- CN108002849A CN108002849A CN201610958625.8A CN201610958625A CN108002849A CN 108002849 A CN108002849 A CN 108002849A CN 201610958625 A CN201610958625 A CN 201610958625A CN 108002849 A CN108002849 A CN 108002849A
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- magnesia
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- mullite
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- C04B35/44—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 aluminates
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Abstract
The present invention provides a kind of refractory brick containing magnesia, it includes the raw material of following mass percents：Mullite bulky grain 20%~30%, calcium hexaluminate little particle 12%~24%, periclase little particle 11%~27%, mullite miropowder 12%~26.5%, magnesia 10%~15%, magnesia sintering aid 0.5%~2%, sulfamic acid fine powder 7%~19%, composite anti-penetrating agent 4.5%~7%, compound binding agent 4%~7%, surplus are pulp-water.The refractory brick component collocation containing magnesia is reasonable, has higher corrosion resistance, good heat endurance and higher refractoriness under load.The present invention also provides a kind of preparation method of the above-mentioned refractory brick containing magnesia, this method step is simple, is easy to industrialized production.
Description
Technical field
The invention belongs to technical field of refractory materials, specifically, relate to a kind of refractory brick containing magnesia and its preparation
Method.
Background technology
Refractory material is due to the corrosion resistance good to high-temperature medium, and the performance with insulation, it is metallurgical,
The high temperature industry such as petrochemical industry, glass is widely used.As energy-saving attention degree is continuously improved in China, there is good protect
The lightweight refracrory of warm heat insulation has obtained more research and developments.Unshape refractory due to construction just
Profit, production cost are low, and the advantage such as overall structure is good of liner body, and receive special attention, wherein being poured especially with fire resisting
Material feeding is applied the most extensive.
Existing refractory brick is mostly cement insulating fire brick, clay brick mainly by mullite, glass phase and cristobalite and
Quartz is formed.Usually using hard paste as raw material, advance mature calcined material, is then equipped with mild-clay, with semidry method or can
Modeling method is molded, and temperature burns till clay tile product at 1300 DEG C~1400 DEG C.The bonding agents such as a small amount of waterglass, cement can also be added
Not burned product and unsetting material is made.Also this refractory brick service life is short, non-reusable.It is further, since traditional
Pore size is larger in refractory aggregate, and aperture is in grade more, so when the material in hot environment in use, due to logical
The aggravation of gas radiation heat transfer and convection current heat transfer, can raise the thermal conductivity factor of refractory material, thereby reduce resistance in air passing hole
The heat insulation and preservation effect of fiery material, increases the loss of thermal energy, causes the rising of energy cost.
In order to solve the problems, such as present on, people are seeking a kind of preferable technical solution always.
The content of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, thus provide it is a kind of have higher refractoriness under load,
Refractory brick containing magnesia of higher corrosion resistance and preparation method thereof.
To achieve these goals, the technical solution adopted in the present invention is：A kind of refractory brick containing magnesia, under it includes
State the raw material of mass percent：Mullite bulky grain 20%~30%, calcium hexaluminate little particle 12%~24%, periclase little particle
11%~27%, mullite miropowder 12%~26.5%, magnesia 10%~15%, magnesia sintering aid 0.5%~2%, sulfamic acid fine powder 7%
~19%, composite anti-penetrating agent 4.5%~7%, compound binding agent 4%~7%, surplus are pulp-water.
Based on above-mentioned, the refractory brick containing magnesia includes the raw material of following mass percents：Mullite bulky grain
22.5%~25%, calcium hexaluminate little particle 13%~19.5%, periclase little particle 12%~19%, mullite miropowder 14%~
24.5%th, magnesia 13%~14%, magnesia sintering aid 1%~2%, sulfamic acid fine powder 9%~16%, composite anti-penetrating agent 5%~7%, compound
Binding agent 5%~5.5%, surplus are pulp-water.
Based on above-mentioned, the compound binding agent is by mass ratio（1~3）：1 phosphate aqueous solution and silica sol group
Into.
Based on above-mentioned, the composite anti-penetrating agent is by mass ratio（2~3）：1：3 nano strontium carbonate, nanometer strontium sulfate and
Nano barium sulfate forms.
Based on above-mentioned, the magnesia sintering aid is attaclay or magnesium chloride hexahydrate.
Based on above-mentioned, the granularity of the mullite bulky grain is the mm of 3 mm~4；The short grained granularity of calcium hexaluminate
For the mm of 1 mm~2；The short grained granularity of periclase is the mm of 1 mm~2.
Based on above-mentioned, the granularity of the sulfamic acid fine powder is less than 0.074 mm, the granularity of the magnesia is less than 0.074
mm；The granularity of the mullite miropowder is less than 0.043 mm.
The present invention also provides a kind of preparation method of the refractory brick containing magnesia, comprise the following steps：
（1）Calculated according to the raw material of above-mentioned mass percent, by mullite bulky grain, calcium hexaluminate little particle, small of periclase
Grain, magnesia and pulp-water carry out mixed grind and prefabricated pug are made；Then mullite miropowder is added into the prefabricated pug, magnesia is helped
Burn agent, sulfamic acid fine powder, composite anti-penetrating agent and compound binding agent and carry out mixed grind and mixed grind pug is made；
（2）The mixed grind pug is pressed into adobe, the refractory brick containing magnesia is made in the adobe after drying and calcining.
Based on above-mentioned, the step（2）Including：The mixed grind pug is pressed into using the pressure of the MPa of 50 MPa~90
Adobe, and by the adobe spontaneously dry 18 it is small when, be subsequently placed in dry kiln, dry 18 at a temperature of 80 DEG C~120 DEG C
When hour~24 are small；Then by the dried adobe carried out at a temperature of 1200 DEG C~1350 DEG C calcining 15 it is small when~20
Hour, so that the refractory brick containing magnesia be made.
The present invention has prominent substantive distinguishing features and significant progress compared with the prior art, specifically, the present invention with
Mullite bulky grain is skeleton raw material, with calcium hexaluminate little particle, periclase little particle, mullite miropowder, sulfamic acid fine powder,
Magnesia is auxiliary material, the solution that the sulfamic acid fine powder that wherein raw material contains is formed after being mixed with the pulp-water can with it is described
Mg (OH) of the magnesia reaction generation with strong cementation2And MgSO4, while with the magnesia sintering aid in raw material, described
Under composite anti-penetrating agent and the synergistic effect of the compound binding agent, realize fine and close filling of the above-mentioned auxiliary material in skeleton raw material so as to
The mixed grind pug is made.The adobe being pressed into by the mixed grind pug is in high-temperature sintering process, because raw material includes tool
There is the calcium hexaluminate little particle of loose structure, can to produce a large amount of Minute pores inside the adobe in a short time,
And the Minute pores will not with the progress of sintering process agglomeration, finally formed and micron order and be uniformly distributed in the product
Stomata.Therefore, by the reasonably combined of raw material, so that it is good to ensure that the refractory brick containing magnesium aluminate spinel has
Dimensional stability.
On the other hand, iron species in part can come out raw material with periphery by precipitation from the magnesia in high-temperature burning process
Counterdiffusion is produced, sutures the gap of each raw material, the periclase little particle thing excellent as high-temperature behavior mutually also functions to bridge
Effect；Not only the surface erosion resistance of the refractory brick had been enhanced but also the mechanical property to improving the refractory brick containing magnesia has very much
Profit.Therefore, the refractory brick containing magnesia has higher surface erosion resistance and higher refractoriness under load.
The present invention also provides a kind of preparation method of the above-mentioned refractory brick containing magnesia, it is by the way that above-mentioned raw materials are mixed to form
Mixed grind pug, the adobe, is then sintered so as to make by the repressed formation adobe of mixed grind pug under the high temperature conditions
The refractory brick containing magnesia is obtained, this method step is simple, is easy to industrialized production.
Embodiment
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
The present embodiment provides a kind of refractory brick containing magnesia, it includes the raw material of following mass percents：Mullite bulky grain
25%th, calcium hexaluminate little particle 13%, periclase little particle 12%, mullite miropowder 14%, magnesia 13%, magnesium chloride hexahydrate 1%, amino
Sulfonic acid fine powder 9%, composite anti-penetrating agent 5%, compound binding agent 5%, pulp-water 3%.Wherein, the compound binding agent is 1 by mass ratio：
1 phosphate aqueous solution and silica sol composition；The composite anti-penetrating agent is 2 by mass ratio：1：3 nano strontium carbonate, receive
Rice strontium sulfate and nano barium sulfate composition.The granularity of the mullite bulky grain is the mm of 3 mm~4；Small of the calcium hexaluminate
The granularity of grain is the mm of 1 mm~2；The short grained granularity of periclase is the mm of 1 mm~2；The grain of the sulfamic acid fine powder
Degree is less than 0.074 mm less than 0.074 mm, the granularity of the magnesia；The granularity of the mullite miropowder is less than 0.043 mm.Respectively
Chemical composition in raw material is as shown in table 1.
Table 1, each raw material main chemical compositions
The present embodiment also provides a kind of preparation method of the refractory brick containing magnesia, and specific preparation process includes：
（1）Calculated according to the raw material of above-mentioned mass percent, by mullite bulky grain, calcium hexaluminate little particle, small of periclase
Grain, magnesia and pulp-water carry out mixed grind and prefabricated pug are made；Then mullite miropowder, six water chlorine are added into the prefabricated pug
Change magnesium, sulfamic acid fine powder, composite anti-penetrating agent and compound binding agent and carry out mixed grind and mixed grind pug is made；
（2）The mixed grind pug is pressed into by adobe using the pressure of 80 MPa of brickmaking machine, and the adobe is spontaneously dried 18
Hour is placed in dry kiln, when drying 20 is small at a temperature of 100 DEG C；Then by the dried adobe at 1300 DEG C
At a temperature of carry out calcining 18 it is small when, so that the refractory brick containing magnesia be made.
Embodiment 2
The present embodiment provides a kind of refractory brick containing magnesia, it includes the raw material of following mass percents：Mullite bulky grain
30%th, calcium hexaluminate little particle 12%, periclase little particle 11%, mullite miropowder 12%, magnesia 10%, magnesium chloride hexahydrate 0.5%, ammonia
Base sulfonic acid fine powder 7%, composite anti-penetrating agent 4.5%, compound binding agent 4%, pulp-water 9%.
Wherein, the compound binding agent is 3 by mass ratio：1 phosphate aqueous solution and silica sol composition；It is described multiple
It is 3 that permeability-reducing admixture, which is closed, by mass ratio：1：3 nano strontium carbonate, nanometer strontium sulfate and nano barium sulfate composition.Big of the mullite
The granularity of grain is the mm of 3 mm~4；The short grained granularity of calcium hexaluminate is the mm of 1 mm~2；The periclase is short grained
Granularity is the mm of 1 mm~2；The granularity of the sulfamic acid fine powder is less than 0.074 mm, the granularity of the magnesia is less than 0.074
mm；The granularity of the mullite miropowder is less than 0.043 mm.
The preparation method of the refractory brick containing magnesia described in the present embodiment is roughly the same with the preparation method in embodiment 1,
Difference is：
The step（2）The mixed grind pug is pressed into by adobe under the pressure of 70 MPa using brickmaking machine, and by the brick
Base is placed in dry kiln when natural drying 18 is small, when drying 18 is small under 80 DEG C of temperature conditionss；Then will be dried
The adobe carried out at a temperature of 1350 DEG C calcining 15 it is small when, so that the refractory brick containing magnesia be made.
Embodiment 3
The present embodiment provides a kind of refractory brick containing magnesia, it includes the raw material of following mass percents：Mullite bulky grain
22.5%th, calcium hexaluminate little particle 13.5%, periclase little particle 15%, mullite miropowder 17%, magnesia 10%, attaclay 0.5%,
Sulfamic acid fine powder 9%, composite anti-penetrating agent 4.5%, compound binding agent 4%, pulp-water 4%.Wherein, the compound binding agent is by quality
Than for 3：1 phosphate aqueous solution and silica sol composition；The composite anti-penetrating agent is 3 by mass ratio：1：3 nano-calcium carbonate
Strontium, nanometer strontium sulfate and nano barium sulfate composition.The granularity of the mullite bulky grain is the mm of 3 mm~4；The calcium hexaluminate
Short grained granularity is the mm of 1 mm~2；The short grained granularity of periclase is the mm of 1 mm~2；The sulfamic acid fine powder
Granularity be less than 0.074 mm, the granularity of the magnesia and be less than 0.074 mm；The granularity of the mullite miropowder is less than 0.043
mm。
The preparation method of the refractory brick containing magnesia described in the present embodiment is identical with the preparation method in embodiment 1.
Refractory brick performance detection containing magnesia
The Air permenbility of the refractory brick containing magnesia prepared respectively to embodiment 1~3, bulk density, refractoriness, cold crushing strength
It is detected with 1350 DEG C of high temperature break resistant intensity performances, testing result is as shown in table 2, and wherein air permeability test condition is：Fire resisting
Brick area 2 × 10-3m2, gas pressure 0.3MPa.
Table 2, the refractory brick performance detection containing magnesia
As can be seen from the above table：Embodiment 1~3 provide the refractory brick containing magnesia fire resisting softening point be more than 1700 DEG C, often
Warm compressive resistance is more than 100MPa, flexural strength is more than 20MPa, bulk density is more than 3.0g/cm3, Air permenbility be less than 0.6m3/ h,
Therefore the refractory brick property indices containing magnesia meet GB/T3994-2013 set quotas, while the product has
The advantages of higher surface erosion resistance and higher refractoriness under load.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
It can modify to the embodiment of the present invention or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical solution, it should all cover among the claimed technical solution scope of the present invention.
Claims (10)
1. a kind of refractory brick containing magnesia, it is characterised in that it includes the raw material of following mass percents：Mullite bulky grain
20%~30%, calcium hexaluminate little particle 12%~24%, periclase little particle 11%~27%, mullite miropowder 12%~26.5%, magnesium
Sand 10%~15%, magnesia sintering aid 0.5%~2%, sulfamic acid fine powder 7%~19%, composite anti-penetrating agent 4.5%~7%, compoiste adhering
Agent 4%~7%, surplus are pulp-water.
2. the refractory brick according to claim 1 containing magnesia, it is characterised in that it includes the original of following mass percents
Material：Mullite bulky grain 22.5%~25%, calcium hexaluminate little particle 13%~19.5%, periclase little particle 12%~19%, Mo Lai
Stone micro mist 14%~24.5%, magnesia 13%~14%, magnesia sintering aid 1%~2%, sulfamic acid fine powder 9%~16%, composite anti-penetrating agent
5%~7%, compound binding agent 5%~5.5%, surplus are pulp-water.
3. the refractory brick according to claim 1 or 2 containing magnesia, it is characterised in that the compound binding agent is by mass ratio
For（1~3）：1 phosphate aqueous solution and silica sol composition.
4. the refractory brick according to claim 1 or 2 containing magnesia, it is characterised in that the composite anti-penetrating agent is by mass ratio
For（2~3）：1：3 nano strontium carbonate, nanometer strontium sulfate and nano barium sulfate composition.
5. the refractory brick according to claim 3 containing magnesia, it is characterised in that the magnesia sintering aid for attaclay or
Magnesium chloride hexahydrate.
6. the refractory brick according to claim 5 containing magnesia, it is characterised in that the granularity of the mullite bulky grain is 3
The mm of mm~4.
7. the refractory brick according to claim 6 containing magnesia, it is characterised in that the short grained granularity of calcium hexaluminate is
The mm of 1 mm~2；The short grained granularity of periclase is the mm of 1 mm~2.
8. the refractory brick according to claim 7 containing magnesia, it is characterised in that the granularity of the sulfamic acid fine powder is less than
0.074 mm, the granularity of the magnesia are less than 0.074 mm；The granularity of the mullite miropowder is less than 0.043 mm.
9. a kind of preparation method of the refractory brick containing magnesia, comprises the following steps：
（1）Raw material according to any one of claim 1~8 mass percent calculates, by mullite bulky grain, calcium hexaluminate
Little particle, periclase little particle, magnesia and pulp-water carry out mixed grind and prefabricated pug are made；Then added into the prefabricated pug
Mullite miropowder, magnesia sintering aid, sulfamic acid fine powder, composite anti-penetrating agent and compound binding agent simultaneously carry out mixed grind mixed grind mud are made
Material；
（2）The mixed grind pug is pressed into adobe, the refractory brick containing magnesia is made in the adobe after drying and calcining.
10. the preparation method of the refractory brick according to claim 9 containing magnesia, it is characterised in that the step（2）Bag
Include：The mixed grind pug is pressed into by adobe using the pressure of the MPa of 50 MPa~90, and it is small that the adobe is spontaneously dried 18
When be placed in dry kiln, at a temperature of 80 DEG C~120 DEG C it is dry 18 it is small when~24 it is small when；Then by the dried brick
Base carried out at a temperature of 1200 DEG C~1350 DEG C calcining 15 it is small when~20 it is small when, so that the refractory brick containing magnesia be made.
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