CN113773061A - Low-pollution preparation process of high-bauxite clinker - Google Patents

Low-pollution preparation process of high-bauxite clinker Download PDF

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CN113773061A
CN113773061A CN202111290443.5A CN202111290443A CN113773061A CN 113773061 A CN113773061 A CN 113773061A CN 202111290443 A CN202111290443 A CN 202111290443A CN 113773061 A CN113773061 A CN 113773061A
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bauxite
kiln
raw material
product
kiln car
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CN113773061B (en
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李道源
王栋
魏武斌
李伟俊
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Anhui Yongmaotai Environmental Protection Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/636—Polysaccharides or derivatives thereof
    • C04B35/6365—Cellulose or derivatives thereof

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention discloses a low-pollution preparation process of bauxite chamotte, belonging to the field of bauxite, wherein the bauxite raw material is uniformly paved on a kiln car, the kiln car is pushed into a kiln from the kiln head and enters a preheating zone, the bauxite raw material is preheated in the preheating zone, the preheated kiln car is sent into a calcining zone, the bauxite raw material is heated and calcined by using combustion equipment arranged at two sides of the kiln, and the kiln car is continuously sent into a cooling zone, so that the problem that the bauxite chamotte is easy to generate cracks when being used as a refractory material is solved; dispersed Si02Can absorb the impact energy of the microcrack and prevent the crack from expanding, and the nano Si0 is at high temperature2And B203The reaction forms a glassy phase and the system begins to transform from an organic structure to an inorganic junctionThe structure is transformed, volume expansion occurs, volume contraction generated during thermal cracking of resin can be effectively inhibited, microcracks generated in the ceramic can be healed, the integrity of a ceramic interface is ensured, and the purpose of inhibiting the generation of the cracks is achieved.

Description

Low-pollution preparation process of high-bauxite clinker
Technical Field
The invention relates to the field of bauxite, in particular to a low-pollution preparation process of bauxite clinker.
Background
Aluminum is the second largest metal material second to steel, is one of important metal materials required by national economy infrastructure, is widely applied to various fields of national economy and the like, has insufficient backup resources in the aluminum industry in China, reduces the guarantee capability, and has to go to resource-saving aluminum industry development roads;
the bauxite chamotte produced by calcining the bauxite is widely applied to aluminum smelting, cement, artificial corundum, chemical industry, metallurgy and other industrial places, the process adopted by the existing bauxite calcining method has the defects of high energy consumption, large discharge, low efficiency, unstable product quality, serious environmental pollution, high labor intensity of workers, severe operating environment and unfavorable tissue production in the production process, and when the produced bauxite chamotte is used as a refractory material, cracks are easily generated, so that the product performance is low.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a low-pollution preparation process of bauxite chamotte, which comprises the following steps:
(1) uniformly paving a bauxite raw material on a kiln car, pushing the kiln car into a kiln from a kiln head, entering a preheating zone, preheating the bauxite raw material in the preheating zone, sending the preheated kiln car into a calcining zone, heating and calcining the bauxite raw material by using combustion equipment arranged at two sides of the kiln, continuously sending the kiln car into a cooling zone, cooling the calcined bauxite raw material by using cold air blown from a kiln tail, finally pushing the kiln car out of the kiln, adding a crack inhibiting auxiliary agent and a compact auxiliary agent into the kiln, uniformly stirring, and naturally cooling to normal temperature to obtain the bauxite chamotte, so that the problems of high energy consumption, large discharge, low efficiency, serious environmental pollution, severe operating environment and unfavorable tissue production in the production process of the process adopted by the conventional bauxite calcining method are solved;
(2) adding p-phenylenediamine into a three-neck flask, stirring under the protection of nitrogen, adding dried pyromellitic dianhydride to obtain a product D, adding B into the mixture4C and SiO2Uniformly mixing, adding a solvent ethanol and a silane coupling agent to obtain a product C, adding the product D into the product C, and naturally cooling to room temperature to obtain the crack-inhibiting additive, so that the problem that the bauxite chamotte is easy to crack when used as a refractory material is solved;
(3) adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser tube, a dropping funnel and a nitrogen inlet tube, adding deionized water as a solvent, introducing nitrogen, adding potassium persulfate and heptenoic acid, carrying out heat preservation reaction for 4-5 hours to obtain a product A, cooling the product A to 40-50 ℃, adding a sodium hydroxide solution to adjust the pH value to obtain the compact auxiliary agent, and solving the problem of poor compactness of the bauxite chamotte during use.
The purpose of the invention can be realized by the following technical scheme:
a low-pollution preparation process of bauxite chamotte comprises the following steps:
s1: uniformly paving the bauxite raw material on a kiln car, pushing the kiln car into a kiln from a kiln head, and enabling the bauxite raw material to enter a preheating zone, wherein a heat source of the preheating zone is hot flue gas generated by burning fuel flowing in from a calcining zone, the heat carried by the hot flue gas is fully utilized, the fuel utilization rate is improved, the energy consumption is reduced, the bauxite raw material is preheated for 12-24 hours at the preheating zone, the temperature is increased to 1300-1600 ℃, and after the bauxite raw material is preheated, the temperature of the hot flue gas is reduced to below 300 ℃;
s2: sending the preheated kiln car into a calcining zone, and heating and calcining the bauxite raw material by using combustion equipment arranged at two sides of the kiln, wherein the temperature of the calcining zone is controlled to be 1400 ℃ plus 1800 ℃, the calcining time is 2-3h, and the shrinkage of the bauxite raw material in the calcining process is 30-40%;
s3: and (3) continuously feeding the kiln car into a cooling zone, cooling the calcined bauxite raw material by cold air blown from the tail of the kiln for 12-24 hours, cooling the bauxite raw material to a temperature lower than 300 ℃, finally pushing the kiln car out of the kiln, adding a crack-inhibiting aid and a compact aid into the bauxite raw material, uniformly stirring, and naturally cooling to the normal temperature to obtain the bauxite clinker.
As a further scheme of the invention: the preparation steps of the crack inhibiting additive in the step S3 are as follows:
s31: adding p-phenylenediamine into a three-neck flask, controlling the temperature at 8-9 ℃, adding solvent N, N-dimethylacetamide, stirring under the protection of nitrogen, adding dry pyromellitic dianhydride, and stirring for 9-10 hours to obtain a product D;
s32: b is to be4C and SiO2Uniformly mixing, adding a solvent ethanol and a silane coupling agent, stirring for 3-4h, performing ultrasonic dispersion for 5-6h, and transferring to a drying oven at 70-95 ℃ for drying for 4-5h to obtain a product C;
s33: and adding the product D into the product C, stirring for 2-3h, heating to 190-.
As a further scheme of the invention: in the step S31, the molar ratio of the m-phenylenediamine to the pyromellitic dianhydride is 1.2-1.3: 1.
as a further scheme of the invention: SiO in step S322、B4The dosage ratio of C to the silane coupling agent is 10 g: 10 g: 1g of the total weight of the composition.
As a further scheme of the invention: the dosage ratio of the product C to the product D in the step S33 is 1 g: 1g of the total weight of the composition.
As a further scheme of the invention: the preparation steps of the densification aid in the step S3 are as follows:
s61: adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser tube, a dropping funnel and a nitrogen inlet tube, adding deionized water as a solvent, introducing nitrogen, heating to 75-85 ℃, adding potassium persulfate and heptenoic acid, and reacting for 4-5 hours under the condition of heat preservation to obtain a product A;
s62: cooling the product A to 40-50 ℃, adding a sodium hydroxide solution to adjust the pH to 7-8, and obtaining the compact auxiliary agent.
As a further scheme of the invention: in step S61, the mass of the potassium persulfate is 2% of the total mass of the hydroxyethyl cellulose, the heptenoic acid and the diallylammonium chloride, and the dosage ratio of the hydroxyethyl cellulose, the heptenoic acid and the diallylammonium chloride is 25 g: 17 g: 0.4g
As a further scheme of the invention: in step S62, the sodium hydroxide is 30% by mass.
The invention has the beneficial effects that:
(1) the invention is characterized in that the bauxite raw material is uniformly paved on a kiln car, the kiln car is pushed into a kiln from a kiln head and enters a preheating zone, the bauxite raw material is preheated in the preheating zone, the preheated kiln car is sent into a calcining zone, the bauxite raw material is heated and calcined by utilizing combustion equipment arranged at two sides of the kiln, the kiln car is continuously sent into a cooling zone, the calcined bauxite raw material is cooled by cold air blown from a kiln tail, finally the kiln car is pushed out of the kiln, a crack-inhibiting additive and a compact additive are added into the kiln car, the mixture is uniformly stirred and naturally cooled to normal temperature, and the bauxite clinker is obtained. Thereby better meeting the process requirements of the production of the bauxite chamotte and further improving the quality of the product;
(2) synthesizing resin matrix by p-phenylenediamine and pyromellitic dianhydride, and synthesizing small-size nano Si02Uniformly dispersed therein, and dispersed Si0 for dispersion strengthening2Can absorb the impact energy of the microcrack and prevent the crack from expanding, thereby enhancing the mechanical property of the system, and the nano Si02Dispersed in resin matrix, acts as active site for physical adsorption and chemical reaction, establishes firm connection between polymer molecular chain and nanometer active site, and transmits stress in compression shearing process to inhibit slippage of polymer molecular chain segment by generating chemical bond and physical adsorption mode, thereby improving bonding strength, and has high temperature stabilityNano Si02And B203The reaction generates a glass phase, the system begins to change from an organic structure to an inorganic structure, and volume expansion occurs, so that volume shrinkage generated during thermal cracking of resin can be effectively inhibited, microcracks generated in ceramic can be healed, the integrity of a ceramic interface is ensured, and the purpose of inhibiting the generation of cracks is achieved;
(3) adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser pipe, a dropping funnel and a nitrogen inlet pipe, adding deionized water as a solvent, introducing nitrogen, adding potassium persulfate and heptenoic acid, carrying out heat preservation reaction for 4-5 hours to obtain a product A, cooling the product A to 40-50 ℃, adding a sodium hydroxide solution to regulate the pH value to obtain the compact auxiliary agent, wherein the molecular chain has more adsorption points, so that the molecular chain wraps the surface of the bauxite chamotte to form a protective layer to prevent the aggregation of particles, form a steric hindrance effect, and remove flocculation among particles, thereby achieving the purpose of improving the compactness of the bauxite chamotte.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment is a low-pollution preparation process of bauxite chamotte, which comprises the following steps:
s1: uniformly paving the bauxite raw material on a kiln car, pushing the kiln car into a kiln from a kiln head, and enabling the bauxite raw material to enter a preheating zone, wherein a heat source of the preheating zone is hot flue gas generated by burning fuel flowing from a calcining zone, the bauxite raw material is preheated for 12 hours in the preheating zone, the temperature is increased to 1300 ℃, and after the bauxite raw material is preheated, the temperature of the hot flue gas is reduced to below 300 ℃;
s2: feeding the preheated kiln car into a calcining zone, and heating and calcining the bauxite raw material by using combustion equipment arranged on two sides of the kiln, wherein the temperature of the calcining zone is controlled at 1400 ℃, the calcining time is 3 hours, and the shrinkage of the bauxite raw material in the calcining process is 30%;
s3: and (3) continuously feeding the kiln car into a cooling zone, cooling the calcined bauxite raw material by cold air blown from the tail of the kiln for 12 hours, cooling the bauxite raw material to a temperature lower than 300 ℃, finally pushing the kiln car out of the kiln, adding a crack-inhibiting aid and a compact aid into the bauxite raw material, uniformly stirring, and naturally cooling to the normal temperature to obtain the bauxite clinker.
The preparation steps of the crack inhibiting additive are as follows:
s31: adding p-phenylenediamine into a three-neck flask, controlling the temperature at 8 ℃, adding a solvent N, N-dimethylacetamide, stirring under the protection of nitrogen, adding dry pyromellitic dianhydride, and stirring for 9 hours to obtain a product D;
s32: b is to be4C and SiO2Uniformly mixing, adding a solvent ethanol and a silane coupling agent, stirring for 3 hours, ultrasonically dispersing for 5 hours, and transferring to a drying oven at 70 ℃ for drying for 4 hours to obtain a product C;
s33: and adding the product D into the product C, stirring for 2h, heating to 190 ℃ at the speed of 5 ℃/min, preserving heat for 2h, heating to 240 ℃ at the speed of 2 ℃/min, preserving heat for 3h, and naturally cooling to room temperature to obtain the crack-inhibiting additive.
The preparation steps of the densification aid in the step S3 are as follows:
s61: adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser tube, a dropping funnel and a nitrogen inlet tube, adding deionized water as a solvent, introducing nitrogen, heating to 75 ℃, adding potassium persulfate and heptenoic acid, and reacting for 4 hours under the condition of heat preservation to obtain a product A;
s62: and cooling the product A to 40 ℃, and adding a sodium hydroxide solution to adjust the pH to 7 to obtain the compact auxiliary agent.
Example 2:
the embodiment is a low-pollution preparation process of bauxite chamotte, which comprises the following steps:
s1: uniformly paving the bauxite raw material on a kiln car, pushing the kiln car into a kiln from a kiln head, and enabling the bauxite raw material to enter a preheating zone, wherein a heat source of the preheating zone is hot flue gas generated by burning fuel flowing from a calcining zone, the bauxite raw material is preheated for 12 hours in the preheating zone, the temperature is increased to 1300 ℃, and after the bauxite raw material is preheated, the temperature of the hot flue gas is reduced to below 300 ℃;
s2: feeding the preheated kiln car into a calcining zone, and heating and calcining the bauxite raw material by using combustion equipment arranged on two sides of the kiln, wherein the temperature of the calcining zone is controlled at 1400 ℃, the calcining time is 2 hours, and the shrinkage of the bauxite raw material in the calcining process is 30%;
s3: and (3) continuously feeding the kiln car into a cooling zone, cooling the calcined bauxite raw material by cold air blown from the tail of the kiln for 1h, cooling the bauxite raw material to a temperature lower than 300 ℃, finally pushing the kiln car out of the kiln, adding a crack-inhibiting aid and a compact aid into the bauxite raw material, uniformly stirring, and naturally cooling to the normal temperature to obtain the bauxite clinker.
The preparation steps of the crack inhibiting additive are as follows:
s31: adding p-phenylenediamine into a three-neck flask, controlling the temperature at 9 ℃, adding a solvent N, N-dimethylacetamide, stirring under the protection of nitrogen, adding dry pyromellitic dianhydride, and stirring for 10 hours to obtain a product D;
s32: b is to be4C and SiO2Uniformly mixing, adding a solvent ethanol and a silane coupling agent, stirring for 4 hours, ultrasonically dispersing for 6 hours, and transferring to a drying oven at 95 ℃ for drying for 5 hours to obtain a product C;
s33: and adding the product D into the product C, stirring for 3h, heating to 200 ℃ at the speed of 6 ℃/min, preserving heat for 3h, heating to 260 ℃ at the speed of 3 ℃/min, preserving heat for 4h, and naturally cooling to room temperature to obtain the crack-inhibiting additive.
The preparation steps of the densification aid in the step S3 are as follows:
s61: adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser tube, a dropping funnel and a nitrogen inlet tube, adding deionized water as a solvent, introducing nitrogen, heating to 85 ℃, adding potassium persulfate and heptenoic acid, and reacting for 5 hours under the condition of heat preservation to obtain a product A;
s62: and cooling the product A to 50 ℃, and adding a sodium hydroxide solution to adjust the pH to 8 to obtain the compact auxiliary agent.
Example 3:
the embodiment is a low-pollution preparation process of bauxite chamotte, which comprises the following steps:
s1: uniformly paving the bauxite raw material on a kiln car, pushing the kiln car into a kiln from a kiln head, and enabling the bauxite raw material to enter a preheating zone, wherein a heat source of the preheating zone is hot flue gas generated by burning fuel flowing from a calcining zone, the bauxite raw material is preheated for 24 hours in the preheating zone, the temperature is increased to 1600 ℃, and after the bauxite raw material is preheated, the temperature of the hot flue gas is reduced to below 300 ℃;
s2: feeding the preheated kiln car into a calcining zone, and heating and calcining the bauxite raw material by using combustion equipment arranged at two sides of the kiln, wherein the temperature of the calcining zone is controlled at 1800 ℃, the calcining time is 3 hours, and the shrinkage of the bauxite raw material in the calcining process is 40%;
s3: and (3) continuously feeding the kiln car into a cooling zone, cooling the calcined bauxite raw material by cold air blown from the tail of the kiln for 24 hours, cooling the bauxite raw material to a temperature lower than 300 ℃, finally pushing the kiln car out of the kiln, adding a crack-inhibiting aid and a compact aid into the bauxite raw material, uniformly stirring, and naturally cooling to the normal temperature to obtain the bauxite clinker.
The preparation steps of the crack inhibiting additive are as follows:
s31: adding p-phenylenediamine into a three-neck flask, controlling the temperature at 9 ℃, adding a solvent N, N-dimethylacetamide, stirring under the protection of nitrogen, adding dry pyromellitic dianhydride, and stirring for 10 hours to obtain a product D;
s32: b is to be4C and SiO2Uniformly mixing, adding a solvent ethanol and a silane coupling agent, stirring for 4 hours, ultrasonically dispersing for 6 hours, and transferring to a drying oven at 95 ℃ for drying for 5 hours to obtain a product C;
s33: and adding the product D into the product C, stirring for 3h, heating to 200 ℃ at the speed of 6 ℃/min, preserving heat for 3h, heating to 260 ℃ at the speed of 3 ℃/min, preserving heat for 4h, and naturally cooling to room temperature to obtain the crack-inhibiting additive.
The preparation steps of the densification aid in the step S3 are as follows:
s61: adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser tube, a dropping funnel and a nitrogen inlet tube, adding deionized water as a solvent, introducing nitrogen, heating to 85 ℃, adding potassium persulfate and heptenoic acid, and reacting for 5 hours under the condition of heat preservation to obtain a product A;
s62: and cooling the product A to 50 ℃, and adding a sodium hydroxide solution to adjust the pH to 8 to obtain the compact auxiliary agent.
Comparative example 1:
comparative example 1 differs from example 1 in that no crack suppression aid was added.
Comparative example 2:
comparative example 2 a commercial bauxite chamotte was used.
The bauxite chamottes of examples 1 to 3 and comparative examples 1 to 2 were prepared as refractory bricks and examined;
the results are shown in the following table:
Figure BDA0003334516440000091
as can be seen from the above table, the bulk density of the examples reached 1.0 to 1.2g/cm3While comparative example 1, in which no crack-inhibiting additive was added, had a bulk density of 0.8g/cm3Comparative example 2 using a commercially available bauxite chamotte had a bulk density of 0.9g/cm3The compressive strength of the examples reached 25.87 to 27.12MPa, the compressive strength of comparative example 1 without addition of the crack-inhibiting additive was 20.52MPa, the compressive strength of comparative example 2 using a commercially available bauxite clinker was 21.37MPa, the flexural strength of the examples reached 5.9 to 6.5MPa, the flexural strength of comparative example 1 without addition of the crack-inhibiting additive was 4.2MPa, the flexural strength of comparative example 2 using a commercially available bauxite clinker was 4.9MPa, and the data of the experimental examples were significantly higher than those of the comparative examples, indicating that the use of the crack-inhibiting additive resulted in a higher flexural strength than those of the comparative examplesThe overall performance of the refractory brick prepared from the bauxite chamotte is improved, so that the aim of improving the overall performance of the bauxite chamotte is fulfilled.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (8)

1. A low-pollution preparation process of bauxite chamotte is characterized by comprising the following steps:
s1: uniformly paving the bauxite raw material on a kiln car, pushing the kiln car into a kiln from a kiln head, entering a preheating zone, and preheating the bauxite raw material in the preheating zone;
s2: feeding the preheated kiln car into a calcining zone, and heating and calcining the high-alumina bauxite raw material by using combustion equipment arranged on two sides of the kiln for 2-3 h;
s3: and (3) continuously feeding the kiln car into a cooling zone, cooling the calcined bauxite raw material by cold air blown from the tail of the kiln, finally pushing the kiln car out of the kiln, adding a crack-inhibiting aid and a compact aid into the kiln, uniformly stirring, and naturally cooling to normal temperature to obtain the bauxite clinker.
2. The process for preparing bauxite chamotte with low pollution as claimed in claim 1, wherein the cracking-inhibiting additive in step S3 is prepared by the following steps:
s31: adding p-phenylenediamine into a three-neck flask, stirring under the protection of nitrogen, and adding dried pyromellitic dianhydride to obtain a product D;
s32: b is to be4C and SiO2Uniformly mixing, and adding a solvent ethanol and a silane coupling agent to obtain a product C;
s33: and adding the product D into the product C, and naturally cooling to room temperature to obtain the crack-inhibiting additive.
3. The process for preparing bauxite chamotte with low pollution as claimed in claim 3, wherein the molar ratio of m-phenylenediamine to pyromellitic dianhydride in step S31 is 1.2-1.3: 1.
4. the process of claim 3, wherein the SiO in step S32 is prepared from bauxite chamotte2、B4The dosage ratio of C to the silane coupling agent is 10 g: 10 g: 1g of the total weight of the composition.
5. The process according to claim 3, wherein the ratio of the amount of the product C to the amount of the product D in step S33 is 1 g: 1g of the total weight of the composition.
6. The process for preparing bauxite chamotte with low pollution as claimed in claim 1, wherein the step of preparing the densification aid in step S3 is as follows:
s61: adding hydroxyethyl cellulose and diallyl ammonium chloride into a three-neck flask provided with a stirrer, a reflux condenser tube, a dropping funnel and a nitrogen inlet tube, adding deionized water as a solvent, introducing nitrogen, adding potassium persulfate and heptenoic acid, and reacting for 4-5 hours under heat preservation to obtain a product A;
s62: and cooling the product A to 40-50 ℃, and adding a sodium hydroxide solution to adjust the pH value to obtain the compact auxiliary agent.
7. The process of claim 6, wherein the mass of the potassium persulfate in the step S61 is 2% of the total mass of the hydroxyethyl cellulose, the heptenoic acid and the diallyl ammonium chloride, and the dosage ratio of the hydroxyethyl cellulose, the heptenoic acid and the diallyl ammonium chloride is 25 g: 17 g: 0.4 g.
8. The process according to claim 6, wherein the sodium hydroxide is 30% by weight in step S62.
CN202111290443.5A 2021-11-02 2021-11-02 Low-pollution preparation process of high-bauxite clinker Active CN113773061B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116444287A (en) * 2023-04-19 2023-07-18 国发环保新材料(江门)有限公司 Foamed ceramic production process and equipment

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Publication number Priority date Publication date Assignee Title
CN102278878A (en) * 2011-07-09 2011-12-14 辽宁科技大学 Method for roasting bauxite in variable cross section tunnel kiln
CN111908903A (en) * 2020-06-16 2020-11-10 浙江攀盛冶金材料有限公司 Aluminum-magnesium ramming mass

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102278878A (en) * 2011-07-09 2011-12-14 辽宁科技大学 Method for roasting bauxite in variable cross section tunnel kiln
CN111908903A (en) * 2020-06-16 2020-11-10 浙江攀盛冶金材料有限公司 Aluminum-magnesium ramming mass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116444287A (en) * 2023-04-19 2023-07-18 国发环保新材料(江门)有限公司 Foamed ceramic production process and equipment
CN116444287B (en) * 2023-04-19 2024-05-07 国发环保新材料(江门)有限公司 Foamed ceramic production process and equipment

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