CN107840676B - Alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof - Google Patents
Alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof Download PDFInfo
- Publication number
- CN107840676B CN107840676B CN201711253667.2A CN201711253667A CN107840676B CN 107840676 B CN107840676 B CN 107840676B CN 201711253667 A CN201711253667 A CN 201711253667A CN 107840676 B CN107840676 B CN 107840676B
- Authority
- CN
- China
- Prior art keywords
- magnesium aluminate
- average particle
- alkali
- cement kiln
- aluminate spinel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- 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
- C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
- C04B35/443—Magnesium aluminate spinel
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—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
- C04B2235/9692—Acid, alkali or halogen resistance
Abstract
The invention discloses an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone and a preparation method thereof, wherein the preparation method comprises the following steps: 1) carrying out hydrothermal reaction on magnesium aluminate spinel, ceramic sand, silicon micropowder, urea, hydrazine hydrate, metal chloride and water to obtain a hydrothermal reaction product; 2) mixing and aging bauxite, attapulgite, aluminum slag, silicon carbide, yttrium oxide, quartz sand, a hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water to prepare a mixture; 3) pressing the mixture to obtain a green brick; 4) and drying, firing and cooling the green brick to obtain the alkali-resistant magnesium aluminate spinel brick for the cement kiln burning zone. The alkali-resistant magnesium aluminate spinel brick for the cement kiln burning zone has excellent alkali resistance.
Description
Technical Field
The invention relates to an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, in particular to an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone and a preparation method thereof.
Background
The cement rotary kiln undergoes a long evolution and development process, and the existing cement industrial kiln mainly comprises a kiln opening, a lower transition zone, a burning zone, a lower transition zone and a safety belt; because the working environment of the burning zone and the transition zone is severe, refractory bricks are required to be arranged on the kiln walls of the burning zone and the transition zone. The ideal refractory brick needs to have the following characteristics: 1) excellent kiln coating hanging performance; 2) high resistance to thermochemical reactions; 3) excellent slag resistance; 4) excellent mechanical strength; 5) excellent thermal shock stability.
However, in the existing cement rotary kiln, various industrial waste resources are often reused and low-grade raw fuel is often used, so that the cement kiln becomes a consumer of industrial waste, and due to the combustion of the waste, the circulation amount of alkali, chlorine and sulfur in the cement kiln is increased, the corrosion to refractory materials is aggravated, and the problem of skinning is more serious.
Disclosure of Invention
The invention aims to provide an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone and a preparation method thereof.
In order to achieve the aim, the invention provides a preparation method of an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, which comprises the following steps:
1) carrying out hydrothermal reaction on magnesium aluminate spinel, ceramic sand, silicon micropowder, urea, hydrazine hydrate, metal chloride and water to obtain a hydrothermal reaction product;
2) mixing and aging bauxite, attapulgite, aluminum slag, silicon carbide, yttrium oxide, quartz sand, a hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water to prepare a mixture;
3) pressing the mixture to obtain a green brick;
4) drying, firing and cooling the green brick to prepare the alkali-resistant magnesia-alumina spinel brick for the cement kiln burning zone;
wherein the magnesium aluminate spinel is prepared from spinel particles A with the average particle size of 0.12-0.18mm, spinel particles B with the average particle size of 0.32-0.45mm and spinel particles C with the average particle size of 1.6-2.0mm according to the weight ratio of 10: 10-15: 3-5 by weight; the metal chloride salt consists of nickel chloride, manganese dichloride, molybdenum pentachloride, vanadium chloride and palladium chloride.
The invention also provides an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, which is prepared by the preparation method.
According to the technical scheme, the raw materials and the processes are organically combined, so that the prepared alkali-resistant magnesium-aluminum spinel brick for the cement kiln burning zone has excellent alkali resistance, and the preparation method has the advantages of simple process and easiness in obtaining of the raw materials.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a preparation method of an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, which comprises the following steps:
1) carrying out hydrothermal reaction on magnesium aluminate spinel, ceramic sand, silicon micropowder, urea, hydrazine hydrate, metal chloride and water to obtain a hydrothermal reaction product;
2) mixing and aging bauxite, attapulgite, aluminum slag, silicon carbide, yttrium oxide, quartz sand, a hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water to prepare a mixture;
3) pressing the mixture to obtain a green brick;
4) drying, firing and cooling the green brick to prepare the alkali-resistant magnesia-alumina spinel brick for the cement kiln burning zone;
wherein the magnesium aluminate spinel is prepared from spinel particles A with the average particle size of 0.12-0.18mm, spinel particles B with the average particle size of 0.32-0.45mm and spinel particles C with the average particle size of 1.6-2.0mm according to the weight ratio of 10: 10-15: 3-5 by weight; the metal chloride salt consists of nickel chloride, manganese dichloride, molybdenum pentachloride, vanadium chloride and palladium chloride.
In step 1) of the present invention, the particle size of each material can be selected within a wide range, but in order to obtain more excellent alkali resistance of the alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, it is preferable that in step 1), the average particle size of the ceramic sand is 0.11 to 0.16mm, and the average particle size of the fine silica powder is 0.10 to 0.25 mm.
In step 1) of the present invention, the amount of each material can be selected from a wide range, but in order to make the prepared alkali-resistant magnesium aluminate spinel brick for the cement kiln burning zone have more excellent alkali resistance, the weight ratio of the magnesium aluminate spinel, the ceramic sand, the silicon micropowder, the urea, the hydrazine hydrate, the metal chloride salt and the water is preferably 10: 3.5-5: 1.5-4: 2-4: 0.4-0.8: 1-1.6: 50-100.
Wherein, in the metal chloride salt, the proportion of each component can be selected in a wide range, but in order to enable the prepared alkali-resistant magnesia-alumina spinel brick for the cement kiln burning zone to have more excellent alkali resistance, preferably, in the metal chloride salt, the weight ratio of the nickel chloride, the manganese dichloride, the molybdenum pentachloride, the vanadium chloride and the palladium chloride is 5: 0.8-1.4: 2-4: 0.3-0.6: 1-1.5.
In step 1) of the present invention, the specific conditions of the hydrothermal reaction can be selected within a wide range, but in order to make the prepared alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone have more excellent alkali resistance, preferably, in step 1), the hydrothermal reaction is: firstly, the material is heated up from 15-35 ℃ to 140-160 ℃ at 2.5-3 ℃/min and is kept warm for 1-2h, and then the material is heated up to 180-200 ℃ at 0.4-0.9 ℃/min and is kept warm for 8-10 h.
In step 2) of the present invention, the amount of each material may be selected from a wide range, but in order to obtain more excellent alkali resistance of the obtained soda-proof magnesium aluminate spinel brick for a cement kiln burning zone, it is preferable that in step 2), the weight ratio of bauxite, attapulgite, aluminum slag, silicon carbide, yttrium oxide, quartz sand, hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water is 10: 7-9: 2-2.5: 0.8-1.3: 0.9-1.4: 2-6: 8-11: 4-5: 2-4: 3.5-4.5: 30-50.
In step 2) of the present invention, the conditions for mixing may be selected within a wide range, but in order to make the resulting alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone more excellent in alkali resistance, it is preferable that in step 2), the mixing satisfies the following conditions: the mixing temperature is 30-40 deg.C, and the mixing time is 40-60 min.
In step 2) of the present invention, the condition of aging can be selected within a wide range, but in order to make the prepared alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone more excellent in alkali resistance, it is preferable that in step 2), the aging satisfies the following condition: the aging temperature is 45-60 ℃, and the aging time is 10-20 h.
In step 2) of the present invention, the particle size of each material can be selected within a wide range, but in order to obtain more excellent alkali resistance of the produced soda-proof magnesium aluminate spinel brick for a cement kiln firing zone, it is preferable that in step 2), the average particle sizes of bauxite, attapulgite and aluminum slag are each independently 1.1 to 1.5mm, and the average particle sizes of silicon carbide, yttrium oxide and quartz sand are each independently 2.5 to 3 mm.
In step 3) of the present invention, the pressing conditions can be selected within a wide range, but in order to make the prepared soda-resistant magnesia-alumina spinel brick for cement kiln burning zone have more excellent soda resistance, preferably, in step 3), the pressing process is as follows: pressing the mixture at 20-25MPa for 20-30min, then at 40-60MPa for 40-60min, and finally at 10-15MPa for 10-15 min.
In step 3) of the present invention, the drying conditions can be selected within a wide range, but in order to make the prepared soda-resistant magnesia-alumina spinel brick for cement kiln firing zone more excellent in soda resistance, it is preferable that in step 4), the drying satisfies the following conditions: the drying temperature is 125-140 ℃, and the drying time is 30-40 h.
In step 4) of the present invention, the firing conditions can be selected within a wide range, but in order to make the alkali-resistant magnesium aluminate spinel brick for cement kiln firing zone more excellent in alkali resistance, it is preferable that in step 4), the firing is: firstly heating from 15-35 ℃ at 0.5-1 ℃/min to 420-.
In step 4) of the present invention, the cooling method can be selected within a wide range, but in order to make the alkali-resistant magnesium aluminate spinel brick for the cement kiln burning zone more excellent in alkali resistance, it is preferable that the cooling is performed by natural cooling.
The invention also provides an alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, which is prepared by the preparation method.
The present invention will be described in detail below by way of examples.
Example 1
1) Mixing magnesium aluminate spinel, pottery sand (average particle size of 0.13 mm) and silicon micropowder (average particle size of 0.15 mm), urea, hydrazine hydrate, metal chloride salt (prepared from nickel chloride, manganese dichloride, molybdenum pentachloride, vanadium chloride and palladium chloride according to the ratio of 5: 1: 3: 0.5: 1.3) water according to a weight ratio of 10: 4: 3: 3: 0.6: 1.3: 80 (the materials are heated up to 150 ℃ from 25 ℃ at the speed of 2.8 ℃/min and are kept warm for 1.5h, then the materials are heated up to 190 ℃ at the speed of 0.7 ℃/min and are kept warm for 9 h) to prepare a hydrothermal reaction product;
2) bauxite (average particle size of 1.3 mm), attapulgite (average particle size of 1.2 mm), aluminum slag (average particle size of 1.4 mm), silicon carbide (average particle size of 2.8 mm), yttrium oxide (average particle size of 2.7 mm), quartz sand (average particle size of 2.8 mm), the hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water were mixed in accordance with a ratio of 10: 8: 2.2: 1.1: 1.2: 4: 9: 4.5: 3: 4: 40 (the mixing temperature is 35 ℃, the mixing time is 50 min), and aging (the aging temperature is 50 ℃, the aging time is 15 h) to prepare a mixture;
3) pressing the mixture at 22MPa for 25min, then at 50MPa for 50min, and finally at 13MPa for 14min to obtain a green brick;
4) drying (the drying temperature is 130 ℃, the drying time is 35 hours) and firing the green brick; then heating the dried green brick from 25 ℃ to 440 ℃ at a speed of 0.8 ℃/min and preserving heat for 1.5h, heating to 1180 ℃ at a speed of 2.8 ℃/min and preserving heat for 4h, and then heating to 1700 ℃ at a speed of 1.3 ℃/min and preserving heat for 1.5 h; finally cooling to obtain the alkali-resistant magnesium aluminate spinel brick A1 for the cement kiln burning zone;
wherein the magnesium aluminate spinel is prepared from spinel particles A with the average particle size of 0.16mm, spinel particles B with the average particle size of 0.35mm and spinel particles C with the average particle size of 1.8mm according to the weight ratio of 10: 13: 4 in a weight ratio.
Example 2
1) Mixing magnesium aluminate spinel, pottery sand (average particle size of 0.11 mm) and silicon micropowder (average particle size of 0.10 mm), urea, hydrazine hydrate, metal chloride salt (prepared from nickel chloride, manganese dichloride, molybdenum pentachloride, vanadium chloride and palladium chloride according to the ratio of 5: 0.8: 2: 0.3: 1) and water in a weight ratio of 10: 3.5: 1.5: 2: 0.4: 1: performing a hydrothermal reaction (heating the materials from 15 ℃ to 140 ℃ at a speed of 2.5 ℃/min and keeping the temperature for 1h, then heating to 180 ℃ at a speed of 0.4 ℃/min and keeping the temperature for 8 h) according to a weight ratio of 50 to obtain a hydrothermal reaction product;
2) bauxite (average particle size of 1.1 mm), attapulgite (average particle size of 1.1 mm), aluminum slag (average particle size of 1.1 mm), silicon carbide (average particle size of 2.5 mm), yttrium oxide (average particle size of 2.5 mm), quartz sand (average particle size of 2.5 mm), the hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water were mixed in accordance with a ratio of 10: 7: 2: 0.8: 0.9: 2: 8: 4: 2: 3.5: 30 (the mixing temperature is 30 ℃, the mixing time is 40 min), and aging (the aging temperature is 45 ℃, the aging time is 10 h) to prepare a mixture;
3) pressing the mixture at 20MPa for 20min, then at 40MPa for 40min, and finally at 10MPa for 10min to obtain a green brick;
4) drying the green brick (the drying temperature is 125 ℃, the drying time is 30 hours) and firing; then heating the dried green brick from 15 ℃ to 420 ℃ at a speed of 0.5 ℃/min and preserving heat for 1h, then heating to 1150 ℃ at a speed of 2.5 ℃/min and preserving heat for 3h, then heating to 1680 ℃ at a speed of 1 ℃/min and preserving heat for 1 h; finally cooling to obtain the alkali-resistant magnesium aluminate spinel brick A2 for the cement kiln burning zone;
wherein the magnesium aluminate spinel is prepared from spinel particles A with the average particle size of 0.12mm, spinel particles B with the average particle size of 0.32mm and spinel particles C with the average particle size of 1.6mm according to the weight ratio of 10: 10: 3 in a weight ratio.
Example 3
1) Mixing magnesium aluminate spinel, pottery sand (average particle size of 0.16 mm) and silicon micropowder (average particle size of 0.25 mm), urea, hydrazine hydrate, metal chloride salt (prepared from nickel chloride, manganese dichloride, molybdenum pentachloride, vanadium chloride and palladium chloride according to the ratio of 5: 1.4: 4: 0.6: 1.5) water according to a weight ratio of 10: 5: 4: 4: 0.8: 1.6: carrying out hydrothermal reaction (heating the materials from 35 ℃ to 160 ℃ at a speed of 3 ℃/min and keeping the temperature for 2h, then heating to 200 ℃ at a speed of 0.9 ℃/min and keeping the temperature for 10 h) according to a weight ratio of 100 to prepare a hydrothermal reaction product;
2) bauxite (average particle size of 1.5 mm), attapulgite (average particle size of 1.5 mm), aluminum slag (average particle size of 1.5 mm), silicon carbide (average particle size of 3 mm), yttrium oxide (average particle size of 3 mm), quartz sand (average particle size of 3 mm), the hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water were mixed in accordance with a ratio of 10: 9: 2.5: 1.3: 1.4: 6: 11: 5: 4: 4.5: mixing at a weight ratio of 30-50 (mixing temperature of 40 ℃ and mixing time of 60 min), and aging (aging temperature of 60 ℃ and aging time of 20 h) to obtain a mixture;
3) pressing the mixture for 30min under 25MPa, then pressing for 60min under 60MPa, and finally pressing for 15min under 15MPa to obtain a green brick;
4) drying the green brick (the drying temperature is 140 ℃, and the drying time is 40 h), and firing; then heating the dried green brick from 35 ℃ to 460 ℃ at a speed of 1 ℃/min and preserving heat for 2h, then heating to 1200 ℃ at a speed of 3 ℃/min and preserving heat for 5h, then heating to 1740 ℃ at a speed of 1.5 ℃/min and preserving heat for 2 h; finally cooling to obtain the alkali-resistant magnesium aluminate spinel brick A3 for the cement kiln burning zone;
wherein the magnesium aluminate spinel is prepared from spinel particles A with the average particle size of 0.18mm, spinel particles B with the average particle size of 0.45mm and spinel particles C with the average particle size of 2.0mm according to the weight ratio of 10: 15: 5 in a weight ratio.
Comparative example 1
The preparation of alkali-resistant magnesia-alumina spinel brick B1 for cement kiln firing zone was carried out in the same manner as in example 1, except that the hydrothermal reaction step 1) was not carried out.
Comparative example 2
The preparation of soda-proof magnesia alumina spinel brick B2 for cement kiln firing zone was carried out according to the method of example 1, except that no magnesia alumina spinel was used in step 1).
Comparative example 3
An alkali-resistant magnesia-alumina spinel brick B3 for a cement kiln firing zone was prepared by following the procedure of example 1, except that no pottery sand was used in step 1).
Comparative example 4
The preparation of soda-proof magnesia-alumina spinel brick B4 for cement kiln firing zone was carried out in the same manner as in example 1, except that no silica fume was used in step 1).
Detection example 1
And (2) opening a blind hole with the caliber of 5cm in the middle of the alkali-resistant magnesium-aluminum spinel brick for the cement kiln burning zone, filling potassium hydroxide, calcium hydroxide and sodium hydroxide (the weight ratio is 1: 3: 1), performing heat treatment on the alkali-resistant magnesium-aluminum spinel brick for the cement kiln burning zone at 500 ℃ for 10 hours, and finally cutting the alkali-resistant magnesium-aluminum spinel brick for the cement kiln burning zone and counting the erosion depth, wherein the specific result is shown in table 1.
TABLE 1
| Alkali-resistant magnesia-alumina spinel brick for cement kiln burning zone | A1 | A2 | A3 | B1 | B2 | B3 | B4 |
| Depth of attack (mm) | 1.1 | 1.5 | 1.4 | 16 | 10 | 5 | 9 |
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (11)
1. A preparation method of alkali-resistant magnesium aluminate spinel bricks for a cement kiln burning zone is characterized by comprising the following steps:
1) carrying out hydrothermal reaction on magnesium aluminate spinel, ceramic sand, silicon micropowder, urea, hydrazine hydrate, metal chloride and water to obtain a hydrothermal reaction product;
2) mixing and aging bauxite, attapulgite, aluminum slag, silicon carbide, yttrium oxide, quartz sand, the hydrothermal reaction product, calcium lignosulfonate, sodium silicate, cyclodextrin and water to prepare a mixture;
3) pressing the mixture to obtain a green brick;
4) drying, firing and cooling the green bricks to prepare the alkali-resistant magnesium aluminate spinel bricks for the cement kiln burning zone;
wherein the magnesium aluminate spinel is prepared from spinel particles A with the average particle size of 0.12-0.18mm, spinel particles B with the average particle size of 0.32-0.45mm and spinel particles C with the average particle size of 1.6-2.0mm according to the weight ratio of 10: 10-15: 3-5 by weight; the metal chloride salt consists of nickel chloride, manganese dichloride, molybdenum pentachloride, vanadium chloride and palladium chloride; in the step 1), the weight ratio of the magnesia-alumina spinel, the ceramic sand, the silicon micropowder, the urea, the hydrazine hydrate, the metal chloride salt and the water is 10: 3.5-5: 1.5-4: 2-4: 0.4-0.8: 1-1.6: 50-100 parts of; in the metal chloride salt, the weight ratio of the nickel chloride, the manganese dichloride, the molybdenum pentachloride, the vanadium chloride and the palladium chloride is 5: 0.8-1.4: 2-4: 0.3-0.6: 1-1.5; in the step 2), the weight ratio of the bauxite, the attapulgite, the aluminum slag, the silicon carbide, the yttrium oxide, the quartz sand, the hydrothermal reaction product, the calcium lignosulfonate, the sodium silicate, the cyclodextrin and the water is 10: 7-9: 2-2.5: 0.8-1.3: 0.9-1.4: 2-6: 8-11: 4-5: 2-4: 3.5-4.5: 30-50.
2. The method according to claim 1, wherein the average particle size of the ceramic sand is 0.11 to 0.16mm, and the average particle size of the fine silica powder is 0.10 to 0.25 mm.
3. The preparation method according to claim 1, wherein, in step 1), the hydrothermal reaction is: firstly, the material is heated up from 15-35 ℃ to 140-160 ℃ at 2.5-3 ℃/min and is kept warm for 1-2h, and then the material is heated up to 180-200 ℃ at 0.4-0.9 ℃/min and is kept warm for 8-10 h.
4. The production method according to claim 1, wherein, in step 2), the mixing satisfies the following condition: the mixing temperature is 30-40 deg.C, and the mixing time is 40-60 min.
5. The preparation method according to claim 1, wherein, in step 2), the aging satisfies the following condition: the aging temperature is 45-60 ℃, and the aging time is 10-20 h.
6. The production method according to claim 1, wherein in step 2), the bauxite, the attapulgite and the aluminum slag each independently have an average particle diameter of 1.1 to 1.5mm, and the silicon carbide, the yttrium oxide and the quartz sand each independently have an average particle diameter of 2.5 to 3 mm.
7. The production method according to any one of claims 1 to 6, wherein in step 3), the pressing process is: firstly, pressing the mixture under 20-25MPa for 20-30min, then pressing under 40-60MPa for 40-60min, and finally pressing under 10-15MPa for 10-15 min.
8. The production method according to claim 7, wherein, in step 4), the drying satisfies the following condition: the drying temperature is 125-140 ℃, and the drying time is 30-40 h.
9. The production method according to claim 7, wherein, in step 4), the firing is: firstly heating from 15-35 ℃ at 0.5-1 ℃/min to 420-.
10. The method according to claim 1, wherein the cooling is performed by natural cooling.
11. An alkali-resistant magnesium aluminate spinel brick for a cement kiln burning zone, which is prepared by the preparation method of any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711253667.2A CN107840676B (en) | 2017-12-02 | 2017-12-02 | Alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711253667.2A CN107840676B (en) | 2017-12-02 | 2017-12-02 | Alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107840676A CN107840676A (en) | 2018-03-27 |
| CN107840676B true CN107840676B (en) | 2020-11-06 |
Family
ID=61663414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711253667.2A Active CN107840676B (en) | 2017-12-02 | 2017-12-02 | Alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107840676B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211164A (en) * | 2011-05-13 | 2011-10-12 | 无锡德乾能源设备有限公司 | Application of refractory brick in casting field |
| WO2014104756A1 (en) * | 2012-12-27 | 2014-07-03 | 재단법인 포항산업과학연구원 | Nickel-based reforming catalyst for producing reduction gas for iron ore reduction and method for manufacturing same, reforming catalyst reaction and equipmemt for maximizing energy efficiency, and method for manufacturing reduction gas using same |
| EP2996998B1 (en) * | 2013-05-16 | 2020-02-12 | BNZ Materials, Inc. | Refractory castables with hydrophobic aggregates |
-
2017
- 2017-12-02 CN CN201711253667.2A patent/CN107840676B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107840676A (en) | 2018-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101713235B (en) | Forsterite light brick and preparation method thereof | |
| CN102775163B (en) | Silicon carbide-cordierite composite ceramic kiln furniture and preparation method thereof | |
| CN102617171B (en) | MgAlON combined aluminum magenisum permeable brick and preparation method thereof | |
| CN103553578B (en) | A kind of gel is in conjunction with easy fired gas permeable brick and preparation technology thereof | |
| CN104230170B (en) | A kind of preparation method of sintering process foaming micro crystal material product | |
| CN103864403A (en) | Mullite light heat-insulation brick based on kyanite tailings and manufacturing method of brick | |
| CN103755361A (en) | Aluminum-chromium-silicon fireproof material | |
| CN106904982A (en) | High alumina insulating refractory raw material with ferrotianium slag as major ingredient and preparation method thereof | |
| CN107586102A (en) | A kind of granite waste stone dust foamed ceramics and preparation method thereof | |
| CN103725281A (en) | Preparation method of low-cost petroleum fracturing propping agent | |
| CN107986805A (en) | A kind of light thermal-shield refractory material based on titanium calcium aluminate and preparation method thereof | |
| CN102765949B (en) | Light-weight cordierite castable and preparation method thereof | |
| CN102584279A (en) | Preparation method of zirconium oxide hollow spheres | |
| CN107840676B (en) | Alkali-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof | |
| CN107857598B (en) | Boron nitride composite magnesium aluminate spinel brick for corrosion-resistant cement kiln transition zone and preparation method thereof | |
| CN107840675B (en) | Sulfur-resistant magnesium aluminate spinel brick for cement kiln burning zone and preparation method thereof | |
| CN105837229B (en) | A kind of preparation method of Mg-Al spinel brick | |
| CN106431435A (en) | Porous periclase-forsterite multiphase material and preparation method thereof | |
| CN107915491B (en) | High-strength refractory brick for cement kiln and preparation method thereof | |
| CN107778017B (en) | Refractory brick with excellent slag resistance for cement kiln burning zone and preparation method thereof | |
| CN107056260A (en) | It is a kind of to be used for blocking environment-friendly type anhydrous stemming of blast furnace tapping hole and preparation method thereof | |
| CN106866126A (en) | A kind of corundum spinelle refractory brick and preparation method thereof | |
| CN105294121B (en) | A kind of light-weight refractory aggregate of anti-thermal shock | |
| CN111875397A (en) | Porous fireproof heat-insulating brick for building and manufacturing method thereof | |
| CN104341145B (en) | Based on the alumina-silicate ceramic fibre and preparation method thereof of cyanite tailing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220914 Address after: Dongshi Street, Nanlou Economic Development Zone, Yingkou City, Liaoning Province, 115000 Patentee after: Liaoning Zhongmei New Materials Co.,Ltd. Address before: 241000 Business Incubation Park No. 415, Weiqi Road, Yijiang District, Wuhu City, Anhui Province Patentee before: WUHU QIANKAI MATERIAL TECHNOLOGY Co.,Ltd. |