CN106588050A - Low-pore magnesite-chrome brick for nonferrous metallurgy and preparation method thereof - Google Patents
Low-pore magnesite-chrome brick for nonferrous metallurgy and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
- C04B35/047—Refractories from grain sized mixtures containing chromium oxide or chrome ore
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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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- 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
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- C04B41/85—Coating or impregnation with inorganic materials
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- 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
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Abstract
The invention discloses a low-pore magnesite-chrome brick for nonferrous metallurgy and a preparation method thereof. In mass percent, the low-pore magnesite-chrome brick for nonferrous metallurgy is mainly composed of 40-65% of raw material electric-fused magnesite-chrome sand, 10-25% of chrome concentrate, 15-35% of magnesite sand and 0-5% of additives; and furthermore, a binding agent accounting for 3-5% of the total mass of all raw materials is added. The preparation method comprises the following steps: orderly mixing according to the matching proportion of the low-pore magnesite-chrome brick for nonferrous metallurgy, molding, sintering, dipping in a nano aluminum oxide suspension and drying through microwaves, thereby obtaining the low-pore magnesite-chrome brick. The product prepared by the invention contains a certain amount of Cr2O3, and the penetration resistance and anti-erosion ability of the material can be improved under the condition that the Cr2O3 content in the product is determined; the product disclosed by the invention can obviously prolong the service life of a kiln and reduce the use cost when being applied to the copper melting field; and meanwhile, the Cr<6+> pollution can be effectively lowered, and the environment can be protected conveniently.
Description
Technical field
The invention belongs to technical field of refractory materials, and in particular to a kind of nonferrous smelting low pore magnesite-chrome brick and its preparation
Method.
Background technology
During nonferrous smelting, although the fusion temperature of the melt for running into is lower than the melt that steel and iron industry runs into very
It is many, but the melt for running into not only has oxide slag, metal bath to also have sulfide melt.The viscosity of these melts is little, flowing
Property is good, strong to the permeability of inner lining material.Magnesian-chrome efractoy, because its elevated temperature strength is high, erosion-resisting characteristics is strong, is to end at present
The widely used inner lining material of nonferrous smelting kiln such as Sa stove, PS copper converters, anode furnace, bottom blowing lead-smelting furnace.But traditional magnesium
The chrome brick porosity is high, air vent aperture is big, key position using when be vulnerable to the infiltration of slag and melt and form metamorphic layer, when
When in-furnace temperature fluctuates, metamorphic layer will burst apart and peel off and damage.
In order to resist the infiltration of slag, the service life of kiln is improved, reduce refractory material air vent aperture, increase moistening
Angle, the viscosity for increasing melt are to reduce the important channel that slag and metal bath are permeated in refractory material.Improve in magnesite-chrome brick
Chromic oxide content be the important method for reducing infiltration, but acquired effect is still limited.Adopt dipping magnesium salt method with
The apparent porosity and air vent aperture for reducing magnesite-chrome brick is another kind of conventional method, but solids content is limited in magnesium salt solution
And magnesia aquation and infringement material property are being caused so as to have a strong impact on leaching salt effect because of the long infringement of process time.
The content of the invention
The technical problem to be solved in the present invention is：Ask for above-mentioned present in current nonferrous smelting process prior art
Topic, a kind of porosity of present invention offer is low, air vent aperture is little, the low pore magnesite-chrome brick of strong ability to resist penetration, good thermal shock stability
And preparation method thereof, i.e., the present invention provides a kind of nonferrous smelting low pore magnesite-chrome brick and preparation method thereof.Using skill of the present invention
Product nonferrous smelting prepared by art scheme is used in low pore magnesite-chrome brick containing a certain amount of Cr2O3, the Cr in product of the present invention2O3
Content certain condition under can improve impermeabilisation, the corrosion resistance of material, kiln can be significantly improved for Copper making field
The service life of stove, attenuating use cost, while Cr effectively can be reduced6+Pollution, is conducive to environmental protection.
In order to solve the above problems, the present invention is adopted the technical scheme that：
The present invention provides a kind of nonferrous smelting with low pore magnesite-chrome brick, is represented with weight/mass percentage composition, and the nonferrous smelting is with low
Pore magnesite-chrome brick is mainly by raw material fused magnesia-chrome 40～65%, fine chrome mine 10～25%, magnesia 15～35% and additive 0～5%
Composition；In addition, adding the bonding agent for accounting for above-mentioned all raw material gross masses 3～5%.
According to above-mentioned nonferrous smelting low pore magnesite-chrome brick, Cr in the fused magnesia-chrome2O3Weight/mass percentage composition be
16～20%.
According to above-mentioned nonferrous smelting low pore magnesite-chrome brick, Cr in the fine chrome mine2O3Weight/mass percentage composition >=45%,
SiO2Weight/mass percentage composition≤1.0%.
According to above-mentioned nonferrous smelting low pore magnesite-chrome brick, burning of the magnesia for weight/mass percentage composition >=97% of MgO
Knot magnesia and/or fused magnesite.
According to above-mentioned nonferrous smelting low pore magnesite-chrome brick, aluminium oxide of the additive for 20 m of granularity ＜.
According to above-mentioned nonferrous smelting with low pore magnesite-chrome brick, the bonding agent is that lignosulfite, magnesium chloride are molten
Any one or any two in liquid and dextrin solution；The proportion of the bonding agent is 1.20～1.25.
Additionally, it is provided a kind of preparation method of above-mentioned nonferrous smelting with low pore magnesite-chrome brick, the preparation method include with
Lower step：
A, batch mixing：Be first according to above-mentioned nonferrous smelting and various raw materials weighed with the ratio of low pore magnesite-chrome brick, by what is weighed
Fused magnesia-chrome, fine chrome mine, magnesia and additive mix 2～3 minutes in adding muller, are subsequently added into bonding agent and are further continued for mixing
Refining 10～20 minutes, obtains mixed material；
B, molding：Adopt forcing press compressing for adobe gained mixed material, the pressure of forcing press is 630～1250 tons,
The bulk density of gained adobe is 3.25～3.35g/cm3；
C, burn till：Gained adobe is placed in exsiccator, is dried to residual moisture ＜ 0.5%；Then dried adobe is placed in
Burnt till in hyperthermia tunnel Kiln, firing temperature is 1700～1800 DEG C, under the conditions of firing temperature, temperature retention time is 8～12 little
When；
D, dipping：The magnesite-chrome brick obtained after burning till is placed in pressure vessel, and it is 1000～1500Pa to be evacuated to vacuum, so
After add previously prepared nano aluminium oxide suspension to magnesite-chrome brick is flooded completely, be then forced into 0.4～0.5 MPa, impregnate
Process 40～60 minutes；
E, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 50～150
DEG C, drying time is 0.5～4h, is dried to moisture ＜ 0.5%, obtains the low pore magnesite-chrome brick of product after being dried.
According to the above-mentioned nonferrous smelting preparation method of low pore magnesite-chrome brick, nano aluminium oxide described in step d suspends
Liquid is to be prepared by the following method to form：
First nano aluminium oxide is added in drinking water, dispersant is subsequently adding, is added between the nano aluminium oxide and drinking water
The mass ratio for entering is 1：1～5, total addition of the dispersant accounts for the 0.2～0.8% of nano aluminium oxide quality；Adjusted using ammonia
The pH value of section suspension is 8～11, then 10～30min of mechanical agitation；After stirring using ultrasound wave continue dispersion 30～
60min, makes nano aluminium oxide suspension after being uniformly dispersed.
According to the above-mentioned nonferrous smelting preparation method of low pore magnesite-chrome brick, the particle diameter of the nano aluminium oxide is 20～
50 nm, Al in the nano aluminium oxide2O3Weight/mass percentage composition >=99.8%.
According to the above-mentioned nonferrous smelting preparation method of low pore magnesite-chrome brick, the dispersant is polymethylacrylic acid
Any one in ammonium, ammonium polyacrylate, sodium polymethacrylate, sodium polyacrylate and sodium hexameta phosphate or any two or wantonly three
Kind.
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, the magnesite-chrome brick for burning till is impregnated using nano aluminium oxide suspension in technical solution of the present invention, it is straight so as to avoid
Connect and nano oxide powder is added in magnesite-chrome brick, as nano-oxide is difficult to the effect on driving birds is not good for disperseing to cause, it also avoid
Using nano-oxide precursor as preparation process is complicated, the unstable magnesite-chrome brick unstable properties for causing of colloidal sol defects.
2nd, nano aluminium oxide of the present invention after dipping and microwave treatment is filled in the apparent pore of magnesite-chrome brick, so as to drop
The low porosity of magnesite-chrome brick, air vent aperture is refined, made the porosity of product reduce by 4～6%, stably improve the anti-of product
Permeability and corrosion resistance；Secondly, using microwave drying, baking temperature is relatively low, drying time reduces the premise of more than half
Under, improve drying efficiency, also avoid using caused by conventional drying methods as drying efficiency is low, drying time length causes magnesium
The aquation of chrome brick causes the reduction of product performance；3rd, impregnated using nano aluminium oxide suspension, it is to avoid routine
Dipping magnesium salt after deposit during moisture absorption aquation and magnesium salt at high temperature decompose caused by the porosity go up caused by product
The reduction of product high-temperature behavior；4th, due to nano aluminium oxide activity at a relatively low sintering temperature, formed spinels solid solution
Body, also improves the thermal shock resistance energy of product；5th, when slag is permeated by pore, due to nano aluminium oxide it is easy
In with FeO-SiO2Metal-oxide FeO reactions in slag generate dystectic FeOAl2O3Spinelle, makes the viscosity of slag
Increase, it is suppressed that the infiltration of slag.
3rd, when product magnesite-chrome brick prepared by the present invention is used for Copper making field, in Cr2O3On the premise of content keeps certain,
The service life of kiln is remarkably improved, use cost is reduced, while being capable of effective control Cr6+Pollute, be conducive to environmental protection.
Specific embodiment：
The present invention is expanded on further with reference to embodiments, but is not intended to limit present disclosure.
Cr in the fused magnesia-chrome adopted in following examples2O3Weight/mass percentage composition be 16～20%；In fine chrome mine
Cr2O3Weight/mass percentage composition >=45%, SiO2Weight/mass percentage composition≤1.0%；Weight/mass percentage composition >=97% of the magnesia for MgO
Magnesite clinker and/or fused magnesite；Aluminium oxide of the additive for adopting for 20 m of granularity ＜.
Embodiment 1：
Nonferrous smelting of the present invention represents with weight/mass percentage composition that with low pore magnesite-chrome brick raw material is consisted of：Fused magnesia-chrome 65%,
South Africa fine chrome mine 15%, magnesite clinker 19% and additive aluminium oxide 1% are constituted；In addition, add accounting for above-mentioned all raw material gross masses 3%
Bonding agent lignosulfite.
Preparation method of 1 nonferrous smelting of the embodiment of the present invention with low pore magnesite-chrome brick, the detailed step of the method are as follows：
A, batch mixing：Be first according to nonferrous smelting described in embodiment 1 various raw materials are weighed with the ratio of low pore magnesite-chrome brick, will
Fused magnesia-chrome, South Africa fine chrome mine, magnesite clinker and the additive alumina raw material for weighing mixes 3 minutes in adding muller,
It is subsequently added into bonding agent lignosulfite and is further continued for mixing 20 minutes, obtains mixed material；
B, molding：Adopt forcing press compressing for adobe gained mixed material, the pressure of forcing press is 1000 tons, gained brick
The bulk density of base is 3.35g/cm3；
C, burn till：Gained adobe is placed in exsiccator, is dried to residual moisture ＜ 0.5%；Then dried adobe is placed in
Burnt till in hyperthermia tunnel Kiln, firing temperature is 1780 DEG C, temperature retention time 10 hours under the conditions of firing temperature；
D, dipping：The magnesite-chrome brick obtained after burning till is placed in pressure vessel, carries out being evacuated to vacuum for 1330Pa, then
Previously prepared nano aluminium oxide suspension is added to carry out being forced into 0.4MPa, impregnation process to magnesite-chrome brick is flooded completely, then
50 minutes；
The nano aluminium oxide suspension is to be prepared by the following method to form：In drinking water, then nano aluminium oxide is added
Dispersant ammonium polymethacrylate is added, the mass ratio between the nano aluminium oxide and drinking water is 1：4, the poly- methyl of dispersant
The addition of ammonium acrylate accounts for the 0.4% of nano aluminium oxide quality；Ammonia is adopted to adjust the pH value of suspension for 9, then machinery is stirred
Mix 30min；Dispersion 50min is continued using ultrasound wave after stirring, nano aluminium oxide suspension after being uniformly dispersed, is made；
E, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 80～120
DEG C, the low pore magnesite-chrome brick of product is obtained after being dried.
Embodiment 2：
Nonferrous smelting of the present invention represents with weight/mass percentage composition that with low pore magnesite-chrome brick raw material is consisted of：Fused magnesia-chrome 50%,
South Africa fine chrome mine 13%, fused magnesite 35% and additive aluminium oxide 2% are constituted；In addition, add accounting for above-mentioned all raw material gross masses 2%
Bonding agent lignosulfite and 1.5% magnesium chloride solution.
Preparation method of 2 nonferrous smelting of the embodiment of the present invention with low pore magnesite-chrome brick, the detailed step of the method are as follows：
A, batch mixing：Be first according to nonferrous smelting described in embodiment 2 various raw materials are weighed with the ratio of low pore magnesite-chrome brick, will
Fused magnesia-chrome, South Africa fine chrome mine, fused magnesite and the additive alumina raw material for weighing mixes 3 minutes in adding muller,
It is subsequently added into bonding agent lignosulfite and magnesium chloride solution is further continued for mixing 15 minutes, obtains mixed material；
B, molding：Adopt forcing press compressing for adobe gained mixed material, the pressure of forcing press is 630 tons, gained brick
The bulk density of base is 3.25g/cm3；
C, burn till：Gained adobe is placed in exsiccator, is dried to residual moisture ＜ 0.5%；Then dried adobe is placed in
Burnt till in hyperthermia tunnel Kiln, firing temperature is 1700 DEG C, temperature retention time 8 hours under the conditions of firing temperature；
D, dipping：The magnesite-chrome brick obtained after burning till is placed in pressure vessel, carries out being evacuated to vacuum for 1330Pa, then
Previously prepared nano aluminium oxide suspension is added to carry out being forced into 0.45MPa, impregnation process to magnesite-chrome brick is flooded completely, then
60 minutes；
The nano aluminium oxide suspension is to be prepared by the following method to form：In drinking water, then nano aluminium oxide is added
Dispersant sodium polyacrylate is added, the mass ratio between the nano aluminium oxide and drinking water is 1：3, dispersant sodium polyacrylate
Addition account for the 0.5% of nano aluminium oxide quality；Ammonia is adopted to adjust the pH value of suspension for 10, then mechanical agitation
20min；Dispersion 60min is continued using ultrasound wave after stirring, nano aluminium oxide suspension after being uniformly dispersed, is made；
E, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 70～130
DEG C, low pore magnesite-chrome brick is obtained after being dried.
Embodiment 3：
Nonferrous smelting of the present invention represents with weight/mass percentage composition that with low pore magnesite-chrome brick raw material is consisted of：Fused magnesia-chrome 60%,
South Africa fine chrome mine 13%, magnesite clinker 26% and additive aluminium oxide 1% are constituted；In addition, add accounting for above-mentioned all raw material gross masses 4%
Dextrin solution.
Preparation method of 3 nonferrous smelting of the embodiment of the present invention with low pore magnesite-chrome brick, the detailed step of the method are as follows：
A, batch mixing：Be first according to nonferrous smelting described in embodiment 3 various raw materials are weighed with the ratio of low pore magnesite-chrome brick, will
Fused magnesia-chrome, South Africa fine chrome mine, magnesite clinker and the additive alumina raw material for weighing mixes 3 minutes in adding muller,
It is subsequently added into bonding agent dextrin solution and is further continued for mixing 15 minutes, obtains mixed material；
B, molding：Adopt forcing press compressing for adobe gained mixed material, the pressure of forcing press is 1000 tons, gained brick
The bulk density of base is 3.29g/cm3；
C, burn till：Gained adobe is placed in exsiccator, is dried to residual moisture ＜ 0.5%；Then dried adobe is placed in
Burnt till in hyperthermia tunnel Kiln, firing temperature is 1750 DEG C, temperature retention time 8 hours under the conditions of firing temperature；
D, dipping：The magnesite-chrome brick obtained after burning till is placed in pressure vessel, carries out being evacuated to vacuum for 1330Pa, then
Previously prepared nano aluminium oxide suspension is added to carry out being forced into 0.5MPa, impregnation process to magnesite-chrome brick is flooded completely, then
45 minutes；
The nano aluminium oxide suspension is to be prepared by the following method to form：
Nano aluminium oxide is added in drinking water, dispersants ammonium polyacrylate, the nano aluminium oxide and drinking water is subsequently adding
Between mass ratio be 2：3, the addition of dispersants ammonium polyacrylate accounts for the 0.3% of nano aluminium oxide quality；Adjusted using ammonia
The pH value of suspension is 11, then mechanical agitation 15min；Dispersion 45min is continued using ultrasound wave after stirring, is made after being uniformly dispersed
Into nano aluminium oxide suspension；
E, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 80～140
DEG C, the low pore magnesite-chrome brick of product is obtained after being dried.
Embodiment 4：
Nonferrous smelting of the present invention represents with weight/mass percentage composition that with low pore magnesite-chrome brick raw material is consisted of：Fused magnesia-chrome 50%,
India's fine chrome mine 19%, fused magnesite 30% and additive aluminium oxide 1% are constituted；In addition, add accounting for above-mentioned all raw material gross masses 4%
Dextrin solution.
Preparation method of 4 nonferrous smelting of the embodiment of the present invention with low pore magnesite-chrome brick, the detailed step of the method are as follows：
A, batch mixing：Be first according to nonferrous smelting described in embodiment 4 various raw materials are weighed with the ratio of low pore magnesite-chrome brick, will
Fused magnesia-chrome, India's fine chrome mine, fused magnesite and the additive alumina raw material for weighing mixes 3 minutes in adding muller,
It is subsequently added into bonding agent dextrin solution and is further continued for mixing 15 minutes, obtains mixed material；
B, molding：Adopt forcing press compressing for adobe gained mixed material, the pressure of forcing press is 1250 tons, gained brick
The bulk density of base is 3.32g/cm3；
C, burn till：Gained adobe is placed in exsiccator, is dried to residual moisture ＜ 0.5%；Then dried adobe is placed in
Burnt till in hyperthermia tunnel Kiln, firing temperature is 1760 DEG C, temperature retention time 10 hours under the conditions of firing temperature；
D, dipping：The magnesite-chrome brick obtained after burning till is placed in pressure vessel, carries out being evacuated to vacuum for 1333Pa, then
Previously prepared nano aluminium oxide suspension is added to carry out being forced into 0.5MPa, impregnation process to magnesite-chrome brick is flooded completely, then
45 minutes；
The nano aluminium oxide suspension is to be prepared by the following method to form：In drinking water, then nano aluminium oxide is added
Dispersant sodium polyacrylate is added, the mass ratio between the nano aluminium oxide and drinking water is 3：7, dispersant sodium polyacrylate
Addition account for the 0.6% of nano aluminium oxide quality；Ammonia is adopted to adjust the pH value of suspension for 10, then mechanical agitation
15min；Dispersion 50min is continued using ultrasound wave after stirring, nano aluminium oxide suspension after being uniformly dispersed, is made；
E, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 80～130
DEG C, the low pore magnesite-chrome brick of product is obtained after being dried；
F, second dipping：The magnesite-chrome brick obtained after first time dipping microwave drying is placed in pressure vessel, evacuation is carried out
Be 1500Pa to vacuum, previously prepared nano aluminium oxide suspension is subsequently adding to magnesite-chrome brick is flooded completely, is then carried out
It is forced into 0.45MPa, impregnation process 60 minutes；
The nano aluminium oxide suspension preparation method with it is for the first time essentially identical, except for the difference that nano aluminium oxide and drinking water it
Between mass ratio be 1：2；
G, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 80～130
DEG C, product of the present invention is obtained after being dried.
The embodiment of the present invention 1,2,3 and 4 prepares the correlated performance detection data result of products obtained therefrom and refers to table 1.
。
Claims (10)
1. a kind of nonferrous smelting is with low pore magnesite-chrome brick, it is characterised in that：Represented with weight/mass percentage composition, the nonferrous smelting is used
Low pore magnesite-chrome brick mainly by raw material fused magnesia-chrome 40～65%, fine chrome mine 10～25%, magnesia 15～35% and additive 0～
5% composition；In addition, adding the bonding agent for accounting for above-mentioned all raw material gross masses 3～5%.
2. nonferrous smelting according to claim 1 is with low pore magnesite-chrome brick, it is characterised in that：In the fused magnesia-chrome
Cr2O3Weight/mass percentage composition be 16～20%.
3. nonferrous smelting according to claim 1 is with low pore magnesite-chrome brick, it is characterised in that：Cr in the fine chrome mine2O3's
Weight/mass percentage composition >=45%, SiO2Weight/mass percentage composition≤1.0%.
4. nonferrous smelting according to claim 1 is with low pore magnesite-chrome brick, it is characterised in that：Matter of the magnesia for MgO
The magnesite clinker and/or fused magnesite of amount percentage composition >=97%.
5. nonferrous smelting according to claim 1 is with low pore magnesite-chrome brick, it is characterised in that：The additive is granularity ＜
The aluminium oxide of 20 m.
6. nonferrous smelting according to claim 1 is with low pore magnesite-chrome brick, it is characterised in that：The bonding agent is sulfurous acid
Any one or any two in spent pulping liquor, magnesium chloride solution and dextrin solution；The proportion of the bonding agent is 1.20～1.25.
7. a kind of preparation method of the nonferrous smelting described in claim 1 with low pore magnesite-chrome brick, it is characterised in that the preparation side
Method is comprised the following steps：
A, batch mixing：Be first according to nonferrous smelting described in claim 1 various raw materials are weighed with the ratio of low pore magnesite-chrome brick,
The fused magnesia-chrome for weighing, fine chrome mine, magnesia and additive are added in muller and is mixed 2～3 minutes, be subsequently added into bonding agent
It is further continued for mixing 10～20 minutes, obtains mixed material；
B, molding：Adopt forcing press compressing for adobe gained mixed material, the pressure of forcing press is 630～1250 tons,
The bulk density of gained adobe is 3.25～3.35g/cm3；
C, burn till：Gained adobe is placed in exsiccator, is dried to residual moisture ＜ 0.5%；Then dried adobe is placed in
Burnt till in hyperthermia tunnel Kiln, firing temperature is 1700～1800 DEG C, under the conditions of firing temperature, temperature retention time is 8～12 little
When；
D, dipping：The magnesite-chrome brick obtained after burning till is placed in pressure vessel, and it is 1000～1500Pa to be evacuated to vacuum, so
After add previously prepared nano aluminium oxide suspension to magnesite-chrome brick is flooded completely, be then forced into 0.4～0.5 MPa, impregnate
Process 40～60 minutes；
E, microwave drying：Magnesite-chrome brick after dipping is placed in microwave drying kiln and is dried process, baking temperature is 50～150
DEG C, drying time is 0.5～4h, is dried to moisture ＜ 0.5%, obtains the low pore magnesite-chrome brick of product after being dried.
8. preparation method of the nonferrous smelting according to claim 7 with low pore magnesite-chrome brick, it is characterised in that in step d
The nano aluminium oxide suspension is to be prepared by the following method to form：
First nano aluminium oxide is added in drinking water, dispersant is subsequently adding, is added between the nano aluminium oxide and drinking water
The mass ratio for entering is 1：1～5, total addition of the dispersant accounts for the 0.2～0.8% of nano aluminium oxide quality；Adjusted using ammonia
The pH value of section suspension is 8～11, then 10～30min of mechanical agitation；After stirring using ultrasound wave continue dispersion 30～
60min, makes nano aluminium oxide suspension after being uniformly dispersed.
9. preparation method of the nonferrous smelting according to claim 8 with low pore magnesite-chrome brick, it is characterised in that：The nanometer
The particle diameter of aluminium oxide is 20～50 nm, Al in the nano aluminium oxide2O3Weight/mass percentage composition >=99.8%.
10. preparation method of the nonferrous smelting according to claim 8 with low pore magnesite-chrome brick, it is characterised in that：Described point
Powder is arbitrary in ammonium polymethacrylate, ammonium polyacrylate, sodium polymethacrylate, sodium polyacrylate and sodium hexameta phosphate
Kind or any two or it is wantonly three kinds.
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| CN107365161A (en) * | 2017-07-17 | 2017-11-21 | 辽宁中镁高温材料有限公司 | A kind of copper composite high-performance magnesite-chrome brick and its manufacture method |
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| CN107365161A (en) * | 2017-07-17 | 2017-11-21 | 辽宁中镁高温材料有限公司 | A kind of copper composite high-performance magnesite-chrome brick and its manufacture method |
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| CN111825468A (en) * | 2020-06-30 | 2020-10-27 | 郑州华威耐火材料有限公司 | Fused and recombined magnesia-chrome brick and preparation method and application thereof |
| CN112500136A (en) * | 2020-12-07 | 2021-03-16 | 海城利尔麦格西塔材料有限公司 | Production method of magnesia-chrome brick |
| CN113511883A (en) * | 2021-08-25 | 2021-10-19 | 郑州瑞泰耐火科技有限公司 | Durable aluminum titanate-containing magnesia-chrome brick for colored smelting and preparation method thereof |
| CN116253575A (en) * | 2023-03-21 | 2023-06-13 | 东北大学 | Magnesium-chromium sand magnesium-based ceramic core and preparation method thereof |
| CN116253575B (en) * | 2023-03-21 | 2024-05-07 | 东北大学 | Magnesium-chromium sand magnesium-based ceramic core and preparation method thereof |
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