CN117923921A - High-heat-storage low-creep clay brick for high-wind-temperature hot blast stove and preparation method thereof - Google Patents
High-heat-storage low-creep clay brick for high-wind-temperature hot blast stove and preparation method thereof Download PDFInfo
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- 239000004927 clay Substances 0.000 title claims abstract description 124
- 239000011449 brick Substances 0.000 title claims abstract description 103
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000005338 heat storage Methods 0.000 title description 30
- 238000009825 accumulation Methods 0.000 claims abstract description 36
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 27
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 17
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 17
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052851 sillimanite Inorganic materials 0.000 claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 16
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 229910052850 kyanite Inorganic materials 0.000 claims abstract description 16
- 239000010443 kyanite Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 claims abstract description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 56
- 239000004576 sand Substances 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 28
- 229910052759 nickel Inorganic materials 0.000 claims description 28
- 239000011651 chromium Substances 0.000 claims description 23
- 229910052595 hematite Inorganic materials 0.000 claims description 23
- 239000011019 hematite Substances 0.000 claims description 23
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 23
- 238000005245 sintering Methods 0.000 claims description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 21
- 229910052804 chromium Inorganic materials 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 13
- 239000011812 mixed powder Substances 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229920001353 Dextrin Polymers 0.000 claims description 4
- 239000004375 Dextrin Substances 0.000 claims description 4
- 235000019425 dextrin Nutrition 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920001131 Pulp (paper) Polymers 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 3
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 15
- 239000011819 refractory material Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 8
- 238000002161 passivation Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 229910021654 trace metal Inorganic materials 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001408630 Chloroclystis Species 0.000 description 1
- 241000527994 Cyclotella gamma Species 0.000 description 1
- 206010011906 Death Diseases 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- -1 guangxi earth Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The application relates to the technical field of refractory materials for high-temperature hot blast stoves, in particular to a clay brick with high heat accumulation and low creep deformation for high-temperature hot blast stoves and a preparation method thereof. The clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove comprises the following raw materials in parts by weight: 30-50 parts of low alumina mullite, 10-25 parts of flint clay, 5-15 parts of kaolin, 1-10 parts of kyanite, 10-20 parts of sillimanite, 1-10 parts of high alumina bauxite, 3-8 parts of white clay, 3-8 parts of Guangxi soil and 5-6 parts of binding agent. The clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove has excellent heat accumulation effect, heat exchange efficiency and corrosion resistance.
Description
Technical Field
The application relates to the technical field of refractory materials for high-temperature hot blast stoves, in particular to a clay brick with high heat accumulation and low creep deformation for high-temperature hot blast stoves and a preparation method thereof.
Background
The hot blast stove is a device for heating and blowing a blast furnace, is an indispensable important component of a modern blast furnace, and mostly adopts a heat accumulating type hot blast stove. The heat accumulating hot blast stove is operated periodically and has two working periods: the combustion period and the air supply period are periodically alternated.
In the combustion period, the gas fuel is combusted in a combustor of the hot blast stove to generate high-temperature flue gas, the high-temperature flue gas passes through holes of the checker bricks of the hot blast stove to transfer heat to the checker bricks, the temperature of the flue gas is reduced while the checker bricks are heated, and the flue gas is cooled by the checker bricks and is discharged into the atmosphere from a chimney through a flue. In the air supply period, cold air from a blower enters the hot air furnace and is heated into hot air by the checker bricks and then is sent into the blast furnace through a hot air pipeline.
In order to enable the hot blast stove to meet the requirement of high wind temperature, the service life of the hot blast stove is prolonged, and strict requirements are imposed on the quality of refractory materials of the hot blast stove and the design of brickwork. For example, a regenerator is a device for heat exchange through heat accumulation and heat release of a medium, is a main place for heat exchange of a hot blast stove, and the internal structural form, the structure, the material and the quality level of a grid body are key for influencing the heat efficiency and the process characteristics. The characteristics of the checker bricks of the regenerator directly affect the heat storage capacity and heat exchange efficiency of the hot blast stove, but the heat storage capacity and heat exchange efficiency of the conventional low-creep clay checker bricks are relatively insufficient.
Disclosure of Invention
In order to overcome the defects of insufficient heat storage capacity and insufficient heat exchange effect of conventional low-creep clay checker bricks, the application provides a high-heat storage low-creep clay brick for a high-wind-temperature hot blast stove and a preparation method thereof.
In a first aspect, the application provides a clay brick with high heat accumulation and low creep deformation for a high-wind-temperature hot blast stove, which adopts the following technical scheme:
The clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove comprises the following raw materials in parts by weight: 30-50 parts of low alumina mullite, 10-25 parts of flint clay, 5-15 parts of kaolin, 1-10 parts of kyanite, 10-20 parts of sillimanite, 1-10 parts of high alumina bauxite, 3-8 parts of white clay, 3-8 parts of Guangxi soil and 5-6 parts of binding agent.
Preferably, the high-heat-accumulation low-creep clay brick for the high-wind-temperature hot blast stove further comprises 4-6 parts of chromium ore sand and 2-4 parts of hematite type nickel ore sand, wherein the chromium ore sand and the hematite type nickel ore sand are added in a composite mode.
The fuel of the blast furnace hot blast stove is usually blast furnace clean gas, and the blast furnace clean gas contains hydrogen and hydrogen chloride gas, wherein the hydrogen is combusted in a burner of the blast furnace hot blast stove to generate water vapor, the water vapor is an important factor for forming an acid dew point on the high heat accumulation low creep clay brick for the high wind temperature hot blast stove, and the hydrogen chloride gas is a main cause for causing the acid corrosion of the high heat accumulation low creep clay brick for the high wind temperature hot blast stove.
Hematite type nickel ore sand is an ore with higher nickel content, and usually contains trace metal elements such as iron, cobalt, copper, zinc, chromium and the like. Chromium ore is an ore with a high chromium content, and usually contains trace metal elements such as magnesium and iron. Therefore, when the chromium ore sand and the hematite type nickel ore sand are also added into the high heat storage low creep clay brick for the high-wind-temperature hot blast stove, and the chromium ore sand and the hematite type nickel ore sand are mixed according to the proportion, a (FeCoNiCuMgZn) Cr2O3 high-entropy oxide system passivation film is formed in the prepared high heat storage low creep clay brick for the high-wind-temperature hot blast stove, and the system passivation film has extremely excellent acid and alkali resistance, so that the corrosion resistance of the high heat storage low creep clay brick for the high-wind-temperature hot blast stove is effectively improved.
Preferably, the grain size of the low alumina mullite is 1-3mm, the grain size of the flint clay is 0.1-1.0mm, the grain size of the kaolin, the kyanite, the sillimanite, the bauxite, the white clay, the guangxi clay, the chromite sand and the hematite type nickel sand is 0.074mm, and the fine screening passing rate of the kaolin, the kyanite, the sillimanite, the bauxite, the white clay, the guangxi clay, the chromite sand and the hematite type nickel sand is more than 95%.
Preferably, the white clay and Guangxi soil are added in a composite form.
Preferably, the binding agent is one or a mixture of more of paper pulp, aluminum dihydrogen phosphate and dextrin.
According to the heat calculation formula: q Suction pipe （ Put and put ） =c.m.DELTA.T=c.gamma.v.DELTA.T (1)
I.e. Q Suction pipe （ Put and put ）=c·m（T Initially, the method comprises -T Powder (D) ）=c·γ·v·（T Initially, the method comprises -T Powder (D) )
Wherein: q is the heat absorbed (evolved) by the checker brick, c is the specific heat of the checker brick, m is the mass of the checker brick, γ is the density of the checker brick, v is the volume of the checker brick, T Initially, the method comprises is the initial temperature of the checker brick, T Powder (D) is the final temperature of the checker brick, and Δt is the change in initial temperature and end-of-life temperature of the checker brick.
According to the heat calculation formula which can be stored by the checker brick in each 1m 2 heating area in one working period:
Q Storage of =C·γ·η·S/2·ΔT kcal/m2 （2）
Wherein: c- -specific heat capacity of checker brick, kcal/kg DEG C
Density of gamma-checker brick, kg/m 3
Eta- -utilization efficiency of brick,%
S/2- -half equivalent thickness of checker brick, m
Delta T- -the temperature change value of the brick surface in one period, DEG C
The heat accumulating capacity of the checker brick is related to the geometric dimension, the shape and the size of the check holes of the checker brick, and the specific heat capacity and the density of the refractory material, and the heat conductivity coefficient determines the heat exchanging efficiency. The relationship between the above formulas (1) and (2) is known. In order to improve the heat storage capacity and the heat exchange efficiency of the heat storage chamber of the hot blast stove, the heat storage capacity of the material can be improved by improving the specific heat capacity and the density of the material under the condition that other conditions are kept unchanged, and the heat exchange efficiency can be improved by improving the heat conductivity of the material, so that the hot blast stove achieves the effects of improving efficiency, reducing consumption and operating at low carbon.
Among the above raw materials, low-alumina mullite and flint clay are used as main raw materials, wherein the mullite has high refractoriness, low thermal expansion, chemical stability, high-temperature creep resistance, thermal shock stability and high thermal conductivity, the flint clay has stable volume, high strength, good heat conduction and small water absorption, and raw materials with different particle diameters are selected for grading to form more compact stacking, so that the compactness of the clay brick is effectively improved, and the heat storage capacity, heat exchange efficiency and high-temperature creep resistance of the clay brick are further improved.
Bai Niantu-Guangxi soil composite clay has the characteristics of excellent dispersibility, binding property and plasticity, easy sintering and the like, and simultaneously under the cooperation of a binding agent and high-pressure forming, the sintering is effectively promoted, the porosity of a clay brick is reduced, the density and the strength of the clay brick are improved, and the heat storage capacity of the clay brick is improved.
Preferably, the chromium ore sand and the hematite type nickel ore sand are added in a composite mode.
The fuel of the blast furnace hot blast stove is usually blast furnace clean gas, and the blast furnace clean gas contains hydrogen and hydrogen chloride gas, wherein the hydrogen is combusted in a burner of the blast furnace hot blast stove to generate water vapor, the water vapor is an important factor for forming an acid dew point on the high heat accumulation low creep clay brick for the high wind temperature hot blast stove, and the hydrogen chloride gas is a main cause for causing the acid corrosion of the high heat accumulation low creep clay brick for the high wind temperature hot blast stove.
Hematite type nickel ore sand is an ore with higher nickel content, and usually contains trace metal elements such as iron, cobalt, copper, zinc, chromium and the like. Chromium ore is an ore with a high chromium content, and usually contains trace metal elements such as magnesium and iron. Therefore, when the chromium ore sand and the hematite type nickel ore sand are also added into the high heat storage low creep clay brick for the high-wind-temperature hot blast stove, and when the proportion is adopted, the prepared high heat storage low creep clay brick for the high-wind-temperature hot blast stove can form a (FeCoNiCuMgZn) Cr 2O3 high-entropy oxide system passivation film, and the system passivation film has extremely excellent acid-base resistance, so that the corrosion resistance of the high heat storage low creep clay brick for the high-wind-temperature hot blast stove is effectively improved.
In a second aspect, the application provides a preparation method of a clay brick with high heat accumulation and low creep deformation for a high-wind-temperature hot blast stove, which adopts the following technical scheme:
a preparation method of a clay brick with high heat accumulation and low creep deformation for a high-wind-temperature hot blast stove comprises the following steps:
s1, premixing kaolin, kyanite, sillimanite, bauxite, white clay and Guangxi soil into mixed powder for later use;
s2, primarily mixing the low-aluminum mullite and the flint clay, adding a binding agent for mixing, and finally adding mixed powder for uniformly mixing to prepare pug;
s3, forming the pug into a green brick under high pressure, and then drying and sintering to obtain the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove.
A preparation method of a clay brick with high heat accumulation and low creep deformation for a high-wind-temperature hot blast stove comprises the following steps:
s1, premixing kaolin, kyanite, sillimanite, bauxite, white clay, guangxi earth, chromium ore sand and hematite type nickel ore sand into mixed powder for later use;
s2, primarily mixing the low-aluminum mullite and the flint clay, adding a binding agent for mixing, and finally adding mixed powder for uniformly mixing to prepare pug;
s3, forming the pug into a green brick under high pressure, and then drying and sintering to obtain the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove.
Preferably, in S1, the mixed powder is prepared by a double-screw mixer, and the mixing time is 20-30min.
Preferably, in S2, the pug is prepared by adopting a rotary disc type wet mill, the mixing time of the particles is 2-3min, the mixing is carried out for 2-4min after the binding agent is added, the mixing powder is added, the mixing is carried out for 6-10min, and the total mixing time is 10-15min.
Preferably, in S3, a 315-500 ton electric control spiral brick press is adopted for molding, and the porosity of the wet blank is controlled to be less than or equal to 17 percent.
Preferably, in S3, drying is carried out by a tunnel dryer, the drying temperature is 80-140 ℃, and the drying moisture is controlled to be less than 1.5%; sintering is carried out by adopting a tunnel kiln, wherein the sintering temperature is 1350-1420 ℃, and the sintering time is 6-10h.
In summary, the application has the following beneficial effects:
1. Mullite has high refractoriness, low thermal expansion, chemical stability, high-temperature creep resistance, thermal shock stability and high thermal conductivity, and flint clay has stable volume, high strength, good thermal conductivity and small water absorption, and raw materials with different particle diameters are selected for grading to form more compact stacking, so that the density of clay bricks is effectively improved, and the heat storage capacity, heat exchange efficiency and high-temperature creep resistance of the clay bricks are further improved.
2. Bai Niantu-Guangxi soil composite clay has the characteristics of excellent dispersibility, binding property and plasticity, easy sintering and the like, and simultaneously under the cooperation of a binding agent and high-pressure forming, the sintering is effectively promoted, the porosity of a clay brick is reduced, the density and the strength of the clay brick are improved, and the heat storage capacity of the clay brick is improved.
3. The method uses low-alumina mullite and flint clay as main raw materials, selects reasonable raw material grain grades for grading to form the closest packing, improves the density of the product, adopts composite bonding clay and bonding agent, adopts high-pressure forming, promotes sintering, reduces the porosity, improves the density and strength of the product, and meets the performance index requirements of high heat accumulation and the like of the product.
4. Compared with the existing products, the clay brick has the characteristics of large heat storage capacity, low porosity, high strength, good high-temperature creep, good erosion resistance, long service life and the like, has the apparent porosity of <16%, is reduced by 4%, the amplitude reduction of more than 20%, the volume density of more than 2.35g/cm 3, the amplitude enhancement of 0.2g/cm 3, the amplitude enhancement of 10.7%, the normal-temperature compressive strength of more than 80MPa, the specific heat capacity (1000 ℃) of 1112J/kg DEG C, the amplitude enhancement of 13.2%, the thermal conductivity of 1.91W/(m DEG C) and the amplitude enhancement of 36.4%.
5. When the chromium ore sand and the hematite type nickel ore sand are also added into the high heat storage low creep clay brick for the high wind temperature hot blast stove, and when the proportion is adopted, the prepared high heat storage low creep clay brick for the high wind temperature hot blast stove can form a (FeCoNiCuMgZn) Cr 2O3 high entropy oxide object system passivation film, and the system passivation film has extremely excellent acid and alkali resistance, thereby effectively improving the erosion resistance of the high heat storage low creep clay brick for the high wind temperature hot blast stove.
Detailed Description
The present application will be described in further detail with reference to examples 1 to 6 and comparative examples 1 to 5.
Raw materials
The low-alumina mullite (Wang Lv) comprises the following chemical components in percentage by mass: al 2O3 47.36%,Fe2O3 0.95.95%;
The flint clay (Wang Lv) comprises the following chemical components in percentage by mass: al 2O3 45.18%,Fe2O3 1.17.17%;
the sillimanite (Lingshou) comprises the following chemical components in percentage by mass: al 2O3 55.27%,Fe2O3 1.09.09%;
the kaolin comprises the following chemical components in percentage by mass: al 2O3 44.53%,Fe2O3 0.51.51%;
the blue crystal stone comprises the following chemical components in percentage by mass: al 2O3 52.06 %,Fe2O3 0.33.33%;
the high bauxite comprises the following chemical components in percentage by mass: al 2O3 81.06 %,Fe2O3 1.43.43%;
The white clay comprises the following chemical components in percentage by mass: al 2O3 43.06 %,Fe2O3 1.43.43%;
the Guangxi soil comprises the following chemical components in percentage by mass: al 2O3 31.82%,Fe2O3 1.25.25%;
The chromium ore sand comprises the following chemical components in percentage by mass: cr 203 46.23%; fe. Mg 19.3%;
the hematite type nickel ore sand comprises the following chemical components in percentage by mass: ni 2.1%; fe. 22.3% of Co, cu and Zn;
the above raw materials are all conventionally commercially available.
Examples
Example 1
The clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove comprises the following raw materials by mass: 35kg of low alumina mullite, 23kg of flint clay, 5kg of kaolin, 5kg of kyanite, 10kg of sillimanite, 7kg of high alumina bauxite, 7kg of white clay, 8kg of Guangxi earth and 5kg of binding agent;
the grain size of the low-alumina mullite is 2mm, the grain size of flint clay is 0.5mm, the grain sizes of kaolin, kyanite, sillimanite, bauxite, white clay and Guangxi soil are 0.074mm, and the fine screen passing rate of the kaolin, kyanite, sillimanite, bauxite, white clay and Guangxi soil is more than 95%;
the white clay and Guangxi soil are added in a composite form, and the binding agent is one or a mixture of more of paper pulp, aluminum dihydrogen phosphate and dextrin, and the preferred embodiment is the dextrin.
A preparation method of a clay brick with high heat accumulation and low creep deformation for a high-wind-temperature hot blast stove comprises the following steps:
s1, premixing kaolin, kyanite, sillimanite, bauxite, white clay and Guangxi soil into mixed powder for later use;
s2, primarily mixing the low-aluminum mullite and the flint clay, adding a binding agent for mixing, and finally adding mixed powder for uniformly mixing to prepare pug;
s3, forming the pug into a green brick under high pressure, and then drying and sintering to obtain the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove;
wherein, the mixed powder of S1 is prepared by a double-screw mixer, and the mixing time is 20-30min, preferably 25min;
S2, preparing pugs by adopting a rotary disc type wet mill, wherein the mixing time of the particles is 2-3min, preferably 2.5min, mixing for 2-4min, preferably 2.5min after adding a bonding agent, mixing for 6-10min, preferably 8min after adding mixed powder, and the total mixing time is 13min;
S3, forming by adopting a 315-500 ton electric control spiral brick press, controlling the porosity of a wet blank to be less than or equal to 17%, drying by adopting a tunnel dryer, and controlling the drying temperature to be 80-140 ℃, preferably 120 ℃ and the drying moisture to be less than 1.5%; the sintering is carried out by adopting a tunnel kiln, the sintering temperature is 1350-1420 ℃, preferably 1400 ℃, and the sintering time is 6-10h, preferably 8h.
Examples 2 to 3
The difference from example 1 is that the proportions of the components of the clay bricks for high heat accumulation and low creep deformation used in the high air temperature hot blast stove are different, and the concrete is shown in Table 1.
Table 1 Each component addition amount/kg of the clay brick for high heat accumulation and low creep deformation used in the high air temperature hot blast stove of examples 1-3
Example 4
The difference from example 1 is that 5kg of chromium ore and 3kg of hematite type nickel ore, the particle size of which is 0.074m, were also added, and the chromium ore and the hematite type nickel ore were added in a composite form.
Examples 5 to 6
The difference from example 4 is that the addition amounts of the chromite-type nickel ore and the hematite-type nickel ore are different, as shown in Table 2.
TABLE 2 addition amount/kg of chromite type nickel ore sand and hematite type nickel ore sand in examples 4 to 6
Comparative example
Comparative example 1
Clay brick for high-wind-temperature hot-blast stove, its trade name is DRN-125.
Comparative example 2
Clay brick for high wind temperature hot blast stove, its trade name is DRN-120.
Comparative example 3
Clay brick for high-wind-temperature hot blast stove, its trade name is DRN-115.
Comparative example 4
Clay brick for high blast temperature hot blast stove, its trade name is DC-XX (Danili).
Comparative example 5
A clay brick for high-wind-temperature hot-blast stove has the trademark PW-FC40/315 (Baoerworth).
Performance test
Detection method
1. Routine performance testing
Three samples were taken from examples 1 to 4 and comparative examples 1 to 5, respectively, and then physicochemical properties of the samples were tested with reference to YB/T5017-2004, and the test results are shown in Table 3.
TABLE 3 physical and chemical Property test Table for examples 1to 4 and comparative examples 1to 5
2. Corrosion resistance test
Three samples were taken from examples 1 and 4-6, each of which was prepared into a10 cm x 40cm block, and then 3 samples were treated at 1400 ℃ for 30min with reference to GB/T3002-2004 "refractory high temperature flexural strength test method", and then the initial flexural strength of the refractory was measured directly and averaged;
Then, another 3 samples were immersed in a 10% aqueous hydrochloric acid solution for 3 hours, followed by placing the samples in a high temperature environment of 1400 ℃ for 30 minutes, followed by measuring the corrosion treatment flexural strength of the refractory material, and taking an average value.
And finally, calculating to obtain the corrosion resistance.
Corrosion resistance = corrosion treatment flexural strength/initial flexural strength x 100%.
The test results are shown in Table 4.
Table 4 corrosion resistance test table/%for example 1 and examples 4-6
Referring to examples 1-4 and comparative examples 1-5 in combination with Table 3, it can be seen that, compared with comparative examples 1-5, each physical and chemical data of examples 1-4 are significantly improved, wherein the apparent porosity of the brick is <16%, the volume density is > 2.35g/cm 3, the normal temperature compressive strength is > 80MPa, the specific heat capacity is 1112J/kg DEG C, and the thermal conductivity is 1.91W/(m DEG C), thereby demonstrating that examples 1-4 have high heat storage, high heat transfer and low creep properties.
The reason for this is that examples 1-4 use low alumina mullite and flint clay as main raw materials, select reasonable raw material grain grades for grading to form the closest packing, improve the product compactness, use compound combination clay and binder, adopt high-pressure forming, promote sintering, reduce the porosity, improve the product compactness and strength, so as to meet the performance index requirements of high heat storage and the like of the product.
Mullite has high refractoriness, low thermal expansion, chemical stability, high-temperature creep resistance, thermal shock stability and high thermal conductivity, and flint clay has stable volume, high strength, good thermal conductivity and small water absorption, and raw materials with different particle diameters are selected for grading to form more compact stacking, so that the density of clay bricks is effectively improved, and the heat storage capacity, heat exchange efficiency and high-temperature creep resistance of the clay bricks are further improved.
Examples 1-4 use low alumina mullite and flint clay as the particles, mullite is the most stable mineral in an aluminum-silicon system, has a chemical formula of 3Al 2O3·2SiO2, and has high refractoriness, low thermal expansion, good chemical stability, high-temperature creep resistance and thermal shock stability. Flint clay is a high-quality hard clay clinker produced in the Shandong province and is a mixture containing various aluminosilicates, the main chemical components of the flint clay are Al 2O3 and SiO 2, a small amount of Fe 2O3 and a small amount of Na 2O、K2 O are contained, and the main mineral is kaolin, so that the flint clay has the characteristics of stable volume, high strength, small water absorption and the like. The flint clay produced by the king aluminum and having the American name of China 'flint clay king' is stable in quality, uniform in texture, compact in structure, white in cross section and suitable for producing high-quality clay refractory materials.
The matrix is introduced with low impurity content of 'three stones', kaolin and the like to strengthen the matrix performance, in particular to the sillimanite and kyanite which are introduced into the matrix part and are irreversibly converted into mullite at high temperature, so that a good mullite network is formed in the mullite conversion process, the mullite crystal phase content is increased, and the microstructure of the material is further improved. The mullite formation process is extended to the whole service life of the refractory material by utilizing the different mullite formation temperatures, and the product and the matrix performance thereof are not deteriorated in any way in the formation process. The "three-stone" material has the characteristic of being directly used for manufacturing refractory products without any pre-sintering treatment, and is an aluminosilicate mineral raw material with excellent performance. The composite use of sillimanite and kyanite powder further enhances the continuous mullite in the firing and using processes, and ensures the structural strength and high-temperature performance of the material product.
Bai Niantu-Guangxi soil composite clay has the characteristics of excellent dispersibility, binding property and plasticity, easy sintering and the like, and simultaneously under the cooperation of a binding agent and high-pressure forming, the sintering is effectively promoted, the porosity of a clay brick is reduced, the density and the strength of the clay brick are improved, and the heat storage capacity of the clay brick is improved.
Referring to examples 1 and 4-6 in combination with Table 4, it can be seen that the conventional properties of example 4 do not vary much from example 1, thus demonstrating that the addition of chromite and hematite type nickel sands has little effect on the conventional properties of clay bricks. However, the corrosion resistance of examples 4 to 6 is obviously improved, and the reason is that when the high heat storage low creep clay brick for the high wind temperature hot blast stove is further added with the chrome ore and the hematite type nickel ore, a passivation film of (FeCoNiCuMgZn) Cr 2O3 high entropy oxide system is formed in the prepared high heat storage low creep clay brick for the high wind temperature hot blast stove, and the passivation film of the system has extremely excellent acid and alkali resistance, so that the corrosion resistance of the high heat storage low creep clay brick for the high wind temperature hot blast stove is effectively improved.
Compared with the embodiment 4, the corrosion resistance of the embodiments 5-6 is relatively low, so that the prepared clay brick for the high heat accumulation and low creep deformation of the high air temperature hot blast stove has better corrosion resistance when the chromium ore sand and the hematite type nickel ore sand are mixed according to the embodiment 4.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (10)
1. The clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove is characterized by comprising the following raw materials in parts by weight: 30-50 parts of low alumina mullite, 10-25 parts of flint clay, 5-15 parts of kaolin, 1-10 parts of kyanite, 10-20 parts of sillimanite, 1-10 parts of high alumina bauxite, 3-8 parts of white clay, 3-8 parts of Guangxi soil and 5-6 parts of binding agent.
2. The high heat accumulation low creep clay brick for high wind temperature hot blast stove according to claim 1, wherein: the high-heat-accumulation low-creep clay brick for the high-wind-temperature hot blast stove further comprises 4-6 parts of chromium ore sand and 2-4 parts of hematite type nickel ore sand, wherein the chromium ore sand and the hematite type nickel ore sand are added in a composite mode.
3. The high heat accumulation low creep clay brick for high wind temperature hot blast stove according to claim 2, wherein: the grain size of the low alumina mullite is 1-3mm, the grain size of the flint clay is 0.1-1.0mm, the grain sizes of kaolin, kyanite, sillimanite, bauxite, white clay, guangxi earth, chromite and hematite type nickel ore sand are 0.074mm, and the fine screen passing rate of the kaolin, kyanite, sillimanite, bauxite, white clay, guangxi earth, chromite and hematite type nickel ore sand is more than 95%.
4. A high heat accumulating low creep clay brick for a high air temperature hot blast stove according to claim 3, wherein: the white clay and Guangxi soil are added in a composite mode.
5. The high heat accumulation low creep clay brick for high wind temperature hot blast stove according to claim 1, wherein: the bonding agent is one or a mixture of more of paper pulp, aluminum dihydrogen phosphate and dextrin.
6. A method for preparing the clay brick with high heat accumulation and low creep deformation for the high wind temperature hot blast stove according to any one of claims 1-5, which is characterized by comprising the following steps:
s1, premixing kaolin, kyanite, sillimanite, bauxite, white clay and Guangxi soil into mixed powder for later use;
s2, primarily mixing the low-aluminum mullite and the flint clay, adding a binding agent for mixing, and finally adding mixed powder for uniformly mixing to prepare pug;
s3, forming the pug into a green brick under high pressure, and then drying and sintering to obtain the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove.
7. The method for preparing the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove according to claim 6, wherein the method comprises the following steps: in S1, the mixed powder is prepared by adopting a double-screw mixer, and the mixing time is 20-30min.
8. The method for preparing the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove according to claim 6, wherein the method comprises the following steps: s2, preparing pug by adopting a rotary disc type wet mill, wherein the mixing time of the particles is 2-3min, mixing for 2-4min after adding the binding agent, mixing for 6-10min after adding the mixed powder, and the total mixing time is 10-15min.
9. The method for preparing the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove according to claim 6, wherein the method comprises the following steps: in S3, forming by adopting a 315-500 ton electric control spiral brick press, wherein the porosity of the wet blank is controlled to be less than or equal to 17 percent.
10. The method for preparing the clay brick with high heat accumulation and low creep deformation for the high-wind-temperature hot blast stove according to claim 9, wherein the method comprises the following steps: s3, drying is carried out by a tunnel dryer, the drying temperature is 80-140 ℃, and the drying moisture is controlled to be less than 1.5%; sintering is carried out by adopting a tunnel kiln, wherein the sintering temperature is 1350-1420 ℃, and the sintering time is 6-10h.
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