CN106588052A - Low-porosity chrome corundum brick and preparation method thereof - Google Patents
Low-porosity chrome corundum brick and preparation method thereof Download PDFInfo
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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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/105—Refractories from grain sized mixtures containing chromium oxide or chrome ore
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5072—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with oxides or hydroxides not covered by C04B41/5025
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention discloses a low-porosity chrome corundum brick and a preparation method thereof. The low-porosity chrome corundum brick is prepared from the following raw materials in percentage by mass: 18-28 percent of corundum with the raw material granularity being 5-3mm, 30-40 percent of corundum with the raw material granularity being 3-1mm, 10-20 percent of corundum with the raw material granularity being 1-0mm, 10-20 percent of corundum with the raw material granularity being smaller than 0.088mm, 1-15 percent of high-content chromium ore or fused chrome oxide with the raw material granularity being 1-0mm and 2-15 percent of high-purity chromium oxide with the raw material granularity being smaller than 0.088mm; and in addition, a phosphate binder accounting 2-5 percent for the total mass of all the raw materials is added. According to the low-porosity chrome corundum brick and the preparation method, a product is prepared by material mixing, forming, sintering, impregnating with a nanometer oxide suspension and microwave drying according to burdening of the low-porosity chrome corundum brick, can lower the apparent porosity and the porosity aperture of a chrome corundum material, and reacts with permeated molten slag to form a high melting point substance, increases the viscosity of the molten slag, and slows down permeation of the molten slag.
Description
Technical field
The present invention relates to technical field of refractory materials, and in particular to low pore chrome corundum brick such as applies to nonferrous smelting field
Chrome corundum brick and preparation method thereof.
Background technology
During nonferrous smelting, furnace lining material subjects the erosion of high temperature and molten slag simultaneously.Although what is run into is molten
The fusion temperature of body is more much lower than the melt that steel and iron industry runs into, but the viscosity of slag is little, good fluidity, and permeability is strong, right
The erosion of inner lining material is serious.Chrome corundum brick is mainly by Al2O3And Cr2O3Two kinds of component compositions, are characterized in refractoriness under load
Height, wearability is good, can resist high temperature gas flow and wash away；Chemical stability is strong, and centering is strong to faintly acid slag repellence.Having
Color smelts the key position of kiln such as Isa furnace, Ausmelt furnace, base husband's Saite stove etc. and achieves extensively application, its service life
Even more than electric smelting recombined magnesia-chrome brick.And it is often colored metallurgical industrial to make the coloured kiln of inner lining material with chrome corundum brick
Can critical process, its service life decide running well for whole operation, improves the corrosion resistance of inner lining material so as to carry
The running rate of high whole operation is significant to colored metallurgical industrial.Cr in increase product2O3Content improves pink fused alumina
Brick corrosion resistance method, is not only added significantly to production cost, and the effect of acquirement is also extremely limited.
The content of the invention
The technical problem to be solved in the present invention is：Asked according to the technology that furnace lining material during current nonferrous smelting is present
Topic, present invention offer one kind can improve the infiltrative product of pink fused alumina refractory material slag-resistant and its method, the i.e. present invention are carried
For a kind of low pore chrome corundum brick and preparation method thereof.Product prepared by the present invention can reduce the apparent porosity of pink fused alumina material
And air vent aperture, and react to form high-melting-point substances with the slag for penetrating into, improve viscosity coefficient of dross, so as to slow down oozing for slag
Thoroughly.
In order to solve the above problems, the present invention is adopted the technical scheme that：
The present invention provides a kind of low pore chrome corundum brick, is represented with weight/mass percentage composition, and the chrome corundum brick is mainly by raw material grain
The corundum 18～28% of degree 5-3mm, the corundum 30～40% of 3-1mm, the corundum 10～20% of 1-0mm, the corundum 10 of ＜ 0.088mm
The high chrome ore or electric smelting chromium oxide 1～15% of～20%, 1-0mm and high-purity chromium oxide 2～15% of ＜ 0.088mm are constituted；In addition,
Addition accounts for the phosphate binders of above-mentioned all raw material gross masses 2～5%.
According to above-mentioned low pore chrome corundum brick, the corundum be electric smelting dense alumina, fused white corundum, electric smelting it is sub- it is white just
At least one in beautiful, fused brown corundum and alundum.
According to above-mentioned low pore chrome corundum brick, the high chrome ore is Cr2O3The fine chrome mine of weight/mass percentage composition >=45%.
According to above-mentioned low pore chrome corundum brick, high-purity chromium oxide is in technical grade chrome oxide green and electric smelting chromium oxide
The mixture of any one or two kinds of；Cr in high-purity chromium oxide2O3Weight/mass percentage composition >=98%.
According to above-mentioned low pore chrome corundum brick, the phosphate binders are phosphoric acid, the hydrogen aluminium of phosphoric acid one and biphosphate
Any one in aluminium；The proportion of the phosphate binders is 1.40～1.50.
Additionally, it is provided a kind of preparation method of above-mentioned low pore chrome corundum brick, the preparation method is comprised the following steps：
A, batch mixing：The proportion scale for being first according to above-mentioned chrome corundum brick weighs various raw materials, by the particulate material of granularity ＞ 0.088mm
Add in kneading machine and stir 1～2 minute, be subsequently adding phosphate binders and be stirred for 2～3 minutes, add after stirring remaining
The powder material of ＜ 0.088mm continues to stir 10～15 minutes, obtains mixed material；
B, shaping：The mixed material that step a is obtained is poured in forcing press and is pressed, control pressure is in pressing process
630～1000 tons；Adobe is obtained after shaping, the bulk density for controlling adobe is 3.40～3.60g/cm3；
C, burn till：The adobe that step b is obtained is initially positioned in drier and is dried, baking temperature is 80～120 DEG C, is dried
Residual moisture≤0.5% of adobe afterwards；Dried adobe is sent into hyperthermia tunnel Kiln and is burnt till, and firing temperature is 1550～
1750 DEG C, firing time is 5～8h；
D, nano-oxide suspension impregnation：Product after step c is burnt till is placed in pressure vessel, is evacuated to vacuum and is
1000～1500Pa, is subsequently adding the nano-oxide suspension of preparation to product is flooded completely, is then pressurizeed, and is forced into
0.4～0.5MPa, impregnation process 10～60 minutes under this pressure condition；
E, microwave drying：Product after step d impregnation process to be sent in microwave dryer and is dried, baking temperature is 50～
150 DEG C, drying time is 0.5～4h；Product chrome corundum brick is obtained after drying.
According to the preparation method of above-mentioned low pore chrome corundum brick, the nano-oxide suspension employed in step d is
It is prepared by the following method and forms：
Weigh nano-oxide to add in drinking water, add dispersant, adopt the acid-base value that ammoniacal liquor adjusts solution to make pH value for 8
～11, then carry out mechanical agitation 10～30 minutes, disperseed 20～60 minutes using ultrasonic wave after stirring, make nano-oxide
Suspension.
According to the preparation method of above-mentioned low pore chrome corundum brick, the nano-oxide is nano aluminium oxide, nano oxygen
Change chromium or nano aluminium oxide and the mixture both nano chromium oxide；Purity >=99.8% of the nano-oxide, particle diameter is 20
～50nm.
According to the preparation method of above-mentioned low pore chrome corundum brick, the dispersant is ammonium polymethacrylate, polypropylene
Any one or any two or wantonly three kinds in sour ammonium, sodium polymethacrylate, Sodium Polyacrylate and calgon.
According to the preparation method of above-mentioned low pore chrome corundum brick, the matter added between the nano-oxide and drinking water
Amount is than being 1:1～5；The addition of the dispersant accounts for the 0.2～0.8% of nano oxidized amount of substance.
The drinking water that the present invention is adopted, refers to that quality reaches the water of standard for drinking.
The positive beneficial effect of the present invention：
1st, technical solution of the present invention carries out the dipping of nano-oxide suspension by the chrome corundum brick to produced in conventional processes,
Nano-oxide in suspension is introduced in the apparent pore of chrome corundum brick, the pore of the product chrome corundum brick of the present invention of preparation is made
Rate reduces by 4～6%.
2nd, nano-oxide of the present invention after impregnation process is filled in the apparent pore of chrome corundum brick, so as to effectively drop
The low porosity of chrome corundum brick, has refined air vent aperture, slow down slag to the infiltration in pore；Simultaneously because nano oxidized
The activity of thing is big, when slag is permeated to pore, it is easy to generate high-melting-point with the bivalent metal oxide reaction in slag
Spinelle or composite spinelle, the viscosity for making slag increases, it is suppressed that the infiltration of slag, so as in the bar of relatively low chromic oxide content
Under part, with good erosion-resisting characteristics, advantageously reduce with pollution of the chromium to environment in rear product.
3rd, when product low-porosity chrome corundum brick prepared by the present invention is used for nonferrous smelting field, kiln can be significantly improved
Service life, reduce use cost, with important economic benefit and social benefit.
Specific embodiment：
The present invention is expanded on further with reference to embodiments, but is not intended to limit present disclosure.
The high chrome ore adopted in following examples is for Cr2O3The fine chrome mine of weight/mass percentage composition >=45%；In high-purity chromium oxide
Cr2O3Weight/mass percentage composition >=98%；Purity >=99.8% of nano-oxide, particle diameter is 20～50nm.
Embodiment 1：
The low pore chrome corundum brick of the present invention, represents, raw material is consisted of with weight/mass percentage composition：The fused white corundum of granularity 5-3mm
The fused white corundum 20% of 20%, 3-1mm, the alundum 15% of 3-1mm, the fused white corundum 10% of 1-0mm, ＜ 0.088mm's
Fused white corundum 20%, the technical grade of the electric smelting chromium oxide 5% of 1-0mm, the electric smelting chromium oxide 5% of ＜ 0.088mm and ＜ 0.088mm
Chrome oxide green 5% is constituted；The aluminium dihydrogen phosphate for accounting for above-mentioned all raw material gross masses 4% be it is possible to additionally incorporate as bonding agent（Biphosphate
The proportion of aluminium is 1.50）.
The preparation method of low pore chrome corundum brick described in the embodiment of the present invention 1, the detailed step of the method is as follows：
A, batch mixing：The proportion scale for being first according to chrome corundum brick described in embodiment 1 weighs various raw materials, by granularity ＞ 0.088mm
Particulate material add kneading machine in stir 2 minutes, be subsequently adding biphosphate Al binding agent and be stirred for 3 minutes, after stirring add
The powder material of remaining ＜ 0.088mm continues to stir 15 minutes, obtains mixed material；
B, shaping：The mixed material that step a is obtained is poured in forcing press and is pressed, control pressure is in pressing process
1000 tons；Adobe is obtained after shaping, the bulk density for controlling adobe is 3.50～3.60g/cm3；
C, burn till：The adobe that step b is obtained is initially positioned in drier and is dried, baking temperature is 80～120 DEG C, is dried
Residual moisture≤0.5% of adobe afterwards；Dried adobe is sent into hyperthermia tunnel Kiln and is burnt till, and firing temperature is 1670 DEG C, is burnt
It is 6h into the time；
D, nano aluminium oxide suspension impregnation：Product after step c is burnt till is placed in pressure vessel, is evacuated to vacuum and is
1330Pa, is subsequently adding the nano aluminium oxide suspension of preparation to product is flooded completely, is then pressurizeed, and is forced into
0.5MPa, impregnation process 40 minutes under this pressure condition；
Nano aluminium oxide suspension is to be prepared by the following method to form：Weigh nano aluminium oxide（The purity of nano aluminium oxide is
99.9%, particle diameter is 30nm）In adding drinking water, dispersant ammonium polymethacrylate is added；The nano aluminium oxide with drink
The mass ratio added between water is 1:1.86；The addition of the dispersant accounts for the 0.5% of nano aluminium oxide quality；Using ammoniacal liquor
It is 10 to adjust the acid-base value of solution and make pH value, then carries out mechanical agitation 15 minutes, is disperseed 50 minutes using ultrasonic wave after stirring,
Make nano aluminium oxide suspension；
E, microwave drying：Product after step d impregnation process is sent in drier and is dried, 80～130 DEG C of baking temperature,
Drying time 2.5h；Product chrome corundum brick is obtained after drying.
Embodiment 2：
The low pore chrome corundum brick of the present invention, represents, raw material is consisted of with weight/mass percentage composition：The electric smelting of granularity 5-3mm is sub- white firm
The electric smelting sub-white corundum 22% of 25%, 3-1mm of jade, the alundum 10% of 3-1mm, the electric smelting sub-white corundum 15% of 1-0mm, ＜
The fused white corundum 11% of 0.088mm, the fine chrome mine 7% of 1-0mm and the technical grade chrome oxide green 10% of ＜ 0.088mm are constituted；In addition
Addition accounts for the phosphoric acid of above-mentioned all raw material gross masses 3% as bonding agent（The proportion of phosphoric acid is 1.45）.
The preparation method of low pore chrome corundum brick described in the embodiment of the present invention 2, the detailed step of the method is as follows：
A, batch mixing：The proportion scale for being first according to chrome corundum brick described in embodiment 2 weighs various raw materials, by granularity ＞ 0.088mm
Particulate material add kneading machine in stir 2 minutes, be subsequently adding phosphoric acid bonding agent and be stirred for 3 minutes, add after stirring remaining
The powder material of ＜ 0.088mm continues to stir 10 minutes, obtains mixed material；
B, shaping：The mixed material that step a is obtained is poured in forcing press and is pressed, control pressure is in pressing process
630 tons；Adobe is obtained after shaping, the bulk density for controlling adobe is 3.45～3.55g/cm3；
C, burn till：The adobe that step b is obtained is initially positioned in drier and is dried, baking temperature is 80～120 DEG C, is dried
Residual moisture≤0.5% of adobe afterwards；Dried adobe is sent into hyperthermia tunnel Kiln and is burnt till, and firing temperature is 1600 DEG C, is burnt
It is 7h into the time；
D, nano chromium oxide suspension impregnation：Product after step c is burnt till is placed in pressure vessel, is evacuated to vacuum and is
1500Pa, is subsequently adding the nano chromium oxide suspension of preparation to product is flooded completely, is then pressurizeed, and is forced into
0.45MPa, impregnation process 50 minutes under this pressure condition；
Nano chromium oxide suspension is to be prepared by the following method to form：Weigh nano chromium oxide（The purity of nano chromium oxide is
99.9%, particle diameter is 40nm）In adding drinking water, Disperser Polysodium Methacrylate is added；The nano chromium oxide with drink
The mass ratio added between water is 1:2.3；The addition of the dispersant accounts for the 0.7% of nano chromium oxide quality；Adjusted using ammoniacal liquor
It is 10 that the acid-base value of section solution makes pH value, then carries out mechanical agitation 15 minutes, is disperseed 40 minutes using ultrasonic wave after stirring, system
Into nano chromium oxide suspension；
E, microwave drying：Product after step d impregnation process is sent in drier and is dried, 80～130 DEG C of baking temperature,
Drying time 2h；Product chrome corundum brick is obtained after drying.
Embodiment 3：
The low pore chrome corundum brick of the present invention, represents, raw material is consisted of with weight/mass percentage composition：The fused brown corundum of granularity 5-3mm
The fused brown corundum 25% of 18%, 3-1mm, the electric smelting sub-white corundum 10% of 3-1mm, the electric smelting sub-white corundum 11% of 1-0mm, ＜
The fused white corundum 18% of 0.088mm, the fine chrome mine 8% of 1-0mm and the technical grade chrome oxide green 10% of ＜ 0.088mm are constituted；In addition
Addition accounts for the phosphoric acid of above-mentioned all raw material gross masses 4% as bonding agent（The proportion of phosphoric acid is 1.42）.
The preparation method of low pore chrome corundum brick described in the embodiment of the present invention 3, the detailed step of the method is as follows：
A, batch mixing：The proportion scale for being first according to chrome corundum brick described in embodiment 3 weighs various raw materials, by granularity ＞ 0.088mm
Particulate material add kneading machine in stir 2 minutes, be subsequently adding phosphoric acid bonding agent and be stirred for 3 minutes, add after stirring remaining
The powder material of ＜ 0.088mm continues to stir 15 minutes, obtains mixed material；
B, shaping：The mixed material that step a is obtained is poured in forcing press and is pressed, control pressure is in pressing process
630 tons；Adobe is obtained after shaping, the bulk density for controlling adobe is 3.45～3.55g/cm3；
C, burn till：The adobe that step b is obtained is initially positioned in drier and is dried, baking temperature is 80～120 DEG C, is dried
Residual moisture≤0.5% of adobe afterwards；Dried adobe is sent into hyperthermia tunnel Kiln and is burnt till, and firing temperature is 1550 DEG C, is burnt
It is 8h into the time；
D, nano aluminium oxide suspension impregnation：Product after step c is burnt till is placed in pressure vessel, is evacuated to vacuum and is
1330Pa, is subsequently adding the nano aluminium oxide suspension of preparation to product is flooded completely, is then pressurizeed, and is forced into
0.45MPa, impregnation process 50 minutes under this pressure condition；
Nano aluminium oxide suspension is to be prepared by the following method to form：Weigh nano aluminium oxide（The purity of nano aluminium oxide is
99.8%, particle diameter is 45nm）In adding drinking water, sodium hexametaphosphate dispersant is added；The nano aluminium oxide and drinking water it
Between add mass ratio be 1:4；The addition of the dispersant accounts for the 0.3% of nano aluminium oxide quality；Solution is adjusted using ammoniacal liquor
Acid-base value make pH value for 9, then carry out mechanical agitation 15 minutes, disperseed 50 minutes using ultrasonic wave after stirring, make nanometer
Aluminum oxide suspension；
E, microwave drying：Product after step d impregnation process is sent in drier and is dried, 80～130 DEG C of baking temperature,
Drying time is 1.5h；
F, second dipping and microwave drying：Product after the process of step e impregnation drying is proceeded into dipping and microwave drying,
Handling process is essentially identical with first time；It is a difference in that in nano aluminium oxide suspension between nano aluminium oxide and drinking water and adds
The mass ratio for entering is 1：3；
G, third time dipping and microwave drying：Product after the process of step f impregnation drying is proceeded into dipping and microwave drying,
Handling process is essentially identical with first time；It is a difference in that in nano aluminium oxide suspension between nano aluminium oxide and drinking water and adds
The mass ratio for entering is 1：2.5；Product chrome corundum brick is obtained after drying.
The correlated performance detection data of product refer to table 1 prepared by the embodiment of the present invention 1,2 and 3.
。
Claims (10)
1. a kind of low pore chrome corundum brick, it is characterised in that：Represented with weight/mass percentage composition, the chrome corundum brick is mainly by raw material
The corundum 18～28% of granularity 5-3mm, the corundum 30～40% of 3-1mm, the corundum 10～20% of 1-0mm, the corundum of ＜ 0.088mm
The high chrome ore or electric smelting chromium oxide 1～15% of 10～20%, 1-0mm and high-purity chromium oxide 2～15% of ＜ 0.088mm are constituted；Separately
Outward, the phosphate binders for accounting for above-mentioned all raw material gross masses 2～5% are added.
2. low pore chrome corundum brick according to claim 1, it is characterised in that：The corundum is electric smelting dense alumina, electricity
At least one in molten white fused alumina, electric smelting sub-white corundum, fused brown corundum and alundum.
3. low pore chrome corundum brick according to claim 1, it is characterised in that：The high chrome ore is Cr2O3Quality percentage contains
The fine chrome mine of amount >=45%.
4. low pore chrome corundum brick according to claim 1, it is characterised in that：High-purity chromium oxide is technical grade oxidation
The mixture of any one or two kinds of in chrome green and electric smelting chromium oxide；Cr in high-purity chromium oxide2O3Weight/mass percentage composition >=
98%。
5. low pore chrome corundum brick according to claim 1, it is characterised in that：The phosphate binders are phosphoric acid, phosphorus
Any one in a sour hydrogen aluminium and aluminium dihydrogen phosphate；The proportion of the phosphate binders is 1.40～1.50.
6. the preparation method of low pore chrome corundum brick described in a kind of claim 1, it is characterised in that the preparation method include with
Lower step：
A, batch mixing：The proportion scale for being first according to chrome corundum brick described in claim 1 weighs various raw materials, by granularity ＞
The particulate material of 0.088mm is added in kneading machine and stirred 1～2 minute, is subsequently adding phosphate binders and is stirred for 2～3 minutes, is stirred
The powder material that remaining ＜ 0.088mm are added after mixing continues to stir 10～15 minutes, obtains mixed material；
B, shaping：The mixed material that step a is obtained is poured in forcing press and is pressed, control pressure is in pressing process
630～1000 tons；Adobe is obtained after shaping, the bulk density for controlling adobe is 3.40～3.60g/cm3；
C, burn till：The adobe that step b is obtained is initially positioned in drier and is dried, baking temperature is 80～120 DEG C, is dried
Residual moisture≤0.5% of adobe afterwards；Dried adobe is sent into hyperthermia tunnel Kiln and is burnt till, and firing temperature is 1550～
1750 DEG C, firing time is 5～8h；
D, nano-oxide suspension impregnation：Product after step c is burnt till is placed in pressure vessel, is evacuated to vacuum and is
1000～1500Pa, is subsequently adding the nano-oxide suspension of preparation to product is flooded completely, is then pressurizeed, and is forced into
0.4～0.5MPa, impregnation process 10～60 minutes under this pressure condition；
E, microwave drying：Product after step d impregnation process to be sent in microwave dryer and is dried, baking temperature is 50～
150 DEG C, drying time is 0.5～4h；Product chrome corundum brick is obtained after drying.
7. the preparation method of low pore chrome corundum brick according to claim 6, it is characterised in that employed in step d
Nano-oxide suspension is to be prepared by the following method to form：
Weigh nano-oxide to add in drinking water, add dispersant, adopt the acid-base value that ammoniacal liquor adjusts solution to make pH value for 8
～11, then carry out mechanical agitation 10～30 minutes, disperseed 20～60 minutes using ultrasonic wave after stirring, make nano-oxide
Suspension.
8. the preparation method of low pore chrome corundum brick according to claim 7, it is characterised in that：The nano-oxide is
The mixture of both nano aluminium oxide, nano chromium oxide or nano aluminium oxide and nano chromium oxide；The nano-oxide it is pure
Degree >=99.8%, particle diameter is 20～50nm.
9. the preparation method of low pore chrome corundum brick according to claim 7, it is characterised in that：The dispersant is poly- first
Any one or any two in base ammonium acrylate, ammonium polyacrylate, sodium polymethacrylate, Sodium Polyacrylate and calgon
Or wantonly three kinds.
10. the preparation method of low pore chrome corundum brick according to claim 7, it is characterised in that：The nano-oxide
The mass ratio added between drinking water is 1:1～5；The addition of the dispersant account for nano oxidized amount of substance 0.2～
0.8%。
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