CN111217595A - Sintered forsterite kiln lining brick for preheating zone of rotary cement kiln - Google Patents
Sintered forsterite kiln lining brick for preheating zone of rotary cement kiln Download PDFInfo
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- CN111217595A CN111217595A CN202010122880.5A CN202010122880A CN111217595A CN 111217595 A CN111217595 A CN 111217595A CN 202010122880 A CN202010122880 A CN 202010122880A CN 111217595 A CN111217595 A CN 111217595A
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- sintered
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- sintered forsterite
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- 229910052839 forsterite Inorganic materials 0.000 title claims abstract description 101
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000011449 brick Substances 0.000 title claims abstract description 61
- 239000004568 cement Substances 0.000 title claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 56
- 239000002245 particle Substances 0.000 claims description 40
- 239000000395 magnesium oxide Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 21
- 238000003801 milling Methods 0.000 claims description 10
- 239000001095 magnesium carbonate Substances 0.000 claims description 8
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 8
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 8
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 229920001131 Pulp (paper) Polymers 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 2
- 238000005188 flotation Methods 0.000 claims description 2
- 238000003837 high-temperature calcination Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010304 firing Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 25
- 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 description 8
- 229910052863 mullite Inorganic materials 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052849 andalusite Inorganic materials 0.000 description 1
- 229910052661 anorthite Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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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
- C04B35/16—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 silicates other than clay
- C04B35/20—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 silicates other than clay rich in magnesium oxide, e.g. forsterite
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
- C04B38/0041—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter the particulate matter having preselected particle sizes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/06—Composite bricks or blocks, e.g. panels, modules
- F27D1/063—Individual composite bricks or blocks
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- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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Abstract
The invention relates to a sintered forsterite kiln lining brick for a preheating zone of a rotary cement kiln, which is prepared by mixing, grinding, forming, drying and firing 8-5mm of sintered forsterite sand, 5-3mm of sintered forsterite sand, 3-1mm of sintered forsterite sand, 1-0mm of sintered forsterite sand, 200-mesh sintered forsterite fine powder and sintered forsterite fine powder which serve as raw materials and pulp waste liquid which serves as a binding agent. The method takes the sintered forsterite sand with wide sources, low price and simple production mode as the main raw material, and has the characteristics of high strength and excellent thermal shock stability; meanwhile, the prepared kiln lining brick of the preheating zone of the rotary kiln has good wear resistance, plays a role in protecting the kiln lining and realizes the effect of having the same service life as the firing zone of the rotary kiln.
Description
Technical Field
The invention belongs to the field of kiln liner high-temperature resistant materials, and particularly relates to a sintered forsterite kiln liner brick for a preheating zone of a rotary cement kiln.
Background
With the continuous growth and the accelerated industrialization process of national economy, the cement consumption in China is increased year by year, the cement is an indispensable necessity for production construction, national economy and the development of people's life, and the progress of the cement production technology becomes an important power for promoting the industrialization development in China.
The rotary kiln is used as important thermal equipment for producing cement clinker, and the production process is that raw material is fed from preheating zone of the kiln (i.e. tail of cold end of the rotary kiln), and under the action of utilizing cylinder body to make continuous rotation, and under the combustion of air to make combustion and release heat and produce high-temp. flue gas, the hot gas is driven by fan and flowed towards cold end so as to make the material and hot air in the kiln continuously implement heat exchange on the kiln lining, and finally the clinker can be obtained by firing. However, the high-temperature material rotates along with the cylinder body, and continuously impacts and rubs the kiln lining material in the preheating zone, so that the kiln lining material is seriously worn, and particularly the preheating zone of the rotary kiln bears more wear. Therefore, the high-performance kiln lining material of the preheating zone is sought, the mechanical abrasion between the high-temperature material and the kiln lining material is slowed down, and the service life of the rotary kiln is greatly prolonged.
At present, kiln lining bricks for a preheating zone of a rotary kiln are mainly silicon mullite bricks. For example, the application publication number "CN 109111215" discloses "a low-aluminum mullite brick for a cement rotary kiln and a preparation method thereof", which provides that the low-aluminum mullite is prepared by the steps of mixing 40-80% of homogeneous material, 0-45% of bauxite chamotte, 5-10% of silicon carbide, 3-10% of Guangxi white mud and pulp waste liquid according to a certain gradation dosage ratio, making a brick blank, drying, firing and the like.
However, the use of the silicon mullite brick in a preheating zone of a rotary kiln has the following problems: firstly, the production process of the silicon mullite brick is complicated, the cost price is expensive, and the cement production cost of enterprises is increased; secondly, the silicon mullite brick has more tridymite content, and can generate crystal form transformation and volume expansion at a certain temperature, so that a kiln lining material of a preheating zone is peeled off, and at the moment, a factory needs to stop kiln production, and the economic benefit of the factory is directly influenced; thirdly, the components in the silicon mullite brick and the cement clinker react to form anorthite and aluminum andalusite with low melting points, which greatly affects the refractory material of a preheating zone and reduces the high-temperature service performance of the preheating zone.
Therefore, the search for a kiln lining material which has good wear resistance, low price and no reaction with cement clinker has become one of the important directions and research hotspots for the development of the preheating zone of the rotary kiln.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a sintered forsterite kiln lining brick for a preheating zone of a rotary cement kiln.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the sintered forsterite kiln lining brick for the preheating zone of the rotary cement kiln is characterized by comprising the following raw materials in percentage by weight:
20-30% of sintered forsterite sand with the particle size of 8-5 mm;
20-30% of sintered forsterite sand with the particle size of 5-3 mm;
10-20% of sintered forsterite sand with the grain diameter of 3-1 mm;
15-25% of sintered forsterite sand with the particle size of 1-0 mm;
10-15% of sintered forsterite fine powder with the particle size of 200 meshes;
10-15% of sintered magnesia fine powder with the particle size of 200 meshes;
and also comprises paper pulp waste liquor which accounts for 1-5% of the total mass of the raw materials of the sintered forsterite kiln lining brick and is used as a bonding agent.
The preparation method of the sintered forsterite kiln lining brick comprises the following specific operation steps:
step one, putting sintered forsterite sand with the particle size of 8-5mm, sintered forsterite sand with the particle size of 5-3mm, sintered forsterite sand with the particle size of 3-1mm and sintered forsterite sand with the particle size of 1-0mm into a mixing mill together by mass percent, and mixing and milling for 10-30min to obtain a mixed material;
step two, adding paper pulp waste liquor accounting for 1-5% of the total mass of the raw materials of the sintered forsterite kiln lining brick as a binding agent, adding the paper pulp waste liquor into the mixed material obtained in the step one, and carrying out mixed grinding for 10-30 min; adding the sintered forsterite fine powder with the particle size of 200 meshes and the sintered magnesia fine powder with the particle size of 200 meshes into a mixing mill, and mixing and milling for 10-30 min; obtaining mixed and ground pug;
pouring the mixed and ground pug into a mold, and pressing and molding by a semi-dry method to obtain a sintered forsterite kiln lining brick green body;
drying the sintered forsterite kiln lining brick green body in a drying kiln at 120-200 ℃ for 10-30 hours to obtain a dried sintered forsterite kiln lining brick green body;
and fifthly, placing the dried sintered forsterite kiln lining brick green body on a kiln trolley, and calcining for 10-15 hours in a 1300-1600 ℃ tunnel kiln to obtain the sintered forsterite kiln lining brick.
The sintered forsterite sand is prepared by adopting high-silicon magnesite or low-grade magnesite flotation tailings as raw materials and adopting a high-temperature calcination mode.
The MgO content in the sintered forsterite sand and the sintered forsterite fine powder in the first step and the second step is 50-65%; the MgO content in the sintered magnesite fine powder is 85-90%.
Compared with the prior art, the invention has the beneficial effects that: 1) the sintered forsterite sand raw material is prepared by magnesite tailings through a high-temperature shaft kiln re-firing process, and the sintered forsterite sand has the characteristics of high strength and excellent thermal shock stability; 2) the forsterite kiln lining brick is adopted to replace a silicon mullite kiln lining brick, does not react with cement clinker, improves the wear resistance and high-temperature use performance of a preheating zone of the rotary kiln, plays a role in protecting the kiln lining, and realizes the effect of having the same service life as a burning zone of the rotary kiln.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The invention is further described below with reference to specific embodiments.
Example 1
Putting 25kg of sintered forsterite sand (MgO = 55%) with the particle size of 8-5mm, 25kg of sintered forsterite sand (MgO = 55%) with the particle size of 5-3mm, 15kg of sintered forsterite sand (MgO = 55%) with the particle size of 3-1mm, and 15kg of sintered forsterite sand (MgO = 55%) with the particle size of 1-0mm into a mixing mill together, and mixing and milling for 30min to obtain a mixed material; adding 3kg of pulp waste liquid as a binding agent into the mixed material, and carrying out mixed grinding for 30 min; then adding 10kg of sintered forsterite fine powder (MgO = 55%) with the particle size of 200 meshes and 10kg of sintered magnesia fine powder (MgO = 85%) with the particle size of 200 meshes into a mixing mill, and mixing and milling for 30 min; obtaining mixed and ground pug; pouring the mixed and ground pug into a mold, and pressing and molding by a semi-dry method to obtain a sintered forsterite kiln lining brick green body; drying the sintered forsterite kiln lining brick green body in a drying kiln for 10 hours at 150 ℃ to obtain a dried sintered forsterite kiln lining brick green body; and placing the dried sintered forsterite kiln lining brick green body on a kiln trolley, and calcining for 12 hours in a tunnel kiln at 1400 ℃ to obtain the sintered forsterite kiln lining brick.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; testing the high-temperature breaking strength of the sample according to GB/T3002-2004; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The sintered forsterite refractory brick synthesized by the method of the embodiment has the volume density of 2.67g/cm3The porosity is 16.4%, the high-temperature breaking strength is 2.3MPa, and the thermal shock resistance frequency is 10 times; the sintered forsterite refractory brick prepared by the method is used as a refractory material for a preheating zone of a rotary cement kiln, and the service life of the sintered forsterite refractory brick is 6 months.
Example 2
Putting 20kg of sintered forsterite sand (MgO = 58%) with the particle size of 8-5mm, 25kg of sintered forsterite sand (MgO = 58%) with the particle size of 5-3mm, 10kg of sintered forsterite sand (MgO = 58%) with the particle size of 3-1mm, and 15kg of sintered forsterite sand (MgO = 58%) with the particle size of 1-0mm into a mixing mill, and mixing and milling for 30min to obtain a mixed material; adding 4kg of pulp waste liquid as a binding agent into the mixed material, and carrying out mixed grinding for 30 min; adding 15kg of sintered forsterite fine powder (MgO = 58%) with the particle size of 200 meshes and 15kg of sintered magnesite fine powder (MgO = 88%) with the particle size of 200 meshes into a mixing mill, and mixing and milling for 30 min; obtaining mixed and ground pug; pouring the mixed and ground pug into a mold, and pressing and molding by a semi-dry method to obtain a sintered forsterite kiln lining brick green body; drying the sintered forsterite kiln lining brick green body in a drying kiln for 18 hours at 120 ℃ to obtain a dried sintered forsterite kiln lining brick green body; and putting the dried sintered forsterite kiln lining brick green body on a kiln trolley, and calcining the dried sintered forsterite kiln lining brick green body in a tunnel kiln at 1600 ℃ for 10 hours to obtain the sintered forsterite kiln lining brick.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; testing the high-temperature breaking strength of the sample according to GB/T3002-2004; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The sintered forsterite refractory brick synthesized by the method of the embodiment has the volume density of 2.80g/cm3The porosity is 12.9 percent, the high-temperature breaking strength is 2.6MPa, and the thermal shock resistance frequency is 8 times; the sintered forsterite refractory brick prepared by the method is used as a refractory material for a preheating zone of a rotary cement kiln, and the service life of the sintered forsterite refractory brick is 7 months.
Example 3
Putting 30kg of sintered forsterite sand (MgO = 63%) with the particle size of 8-5mm, 20kg of sintered forsterite sand (MgO = 63%) with the particle size of 5-3mm, 15kg of sintered forsterite sand (MgO = 63%) with the particle size of 3-1mm, and 15kg of sintered forsterite sand (MgO = 63%) with the particle size of 1-0mm into a mixing mill, and mixing and milling for 30min to obtain a mixed material; adding 3kg of pulp waste liquid as a binding agent into the mixed material, and carrying out mixed grinding for 30 min; then adding 10kg of sintered forsterite fine powder (MgO = 63%) with the particle size of 200 meshes and 10kg of sintered magnesia fine powder (MgO = 90%) with the particle size of 200 meshes into a mixing mill, and mixing and milling for 30 min; obtaining mixed and ground pug; pouring the mixed and ground pug into a mold, and pressing and molding by a semi-dry method to obtain a sintered forsterite kiln lining brick green body; drying the sintered forsterite kiln lining brick green body in a drying kiln for 20 hours at 140 ℃ to obtain a dried sintered forsterite kiln lining brick green body; and placing the dried sintered forsterite kiln lining brick green body on a kiln trolley, and calcining for 15 hours in a 1550 ℃ tunnel kiln to obtain the sintered forsterite kiln lining brick.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; testing the high-temperature breaking strength of the sample according to GB/T3002-2004; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The sintered forsterite refractory brick synthesized by the method of the embodiment has the volume density of 2.86g/cm3The porosity is 10.4%, the high-temperature breaking strength is 2.9MPa, and the thermal shock resistance frequency is 8 times; the sintered forsterite refractory brick prepared by the method is used as a refractory material for a preheating zone of a rotary cement kiln, and the service life of the sintered forsterite refractory brick is 7.5 months.
Claims (3)
1. The sintered forsterite kiln lining brick for the preheating zone of the rotary cement kiln is characterized by comprising the following raw materials in percentage by weight:
20-30% of sintered forsterite sand with the particle size of 8-5 mm;
20-30% of sintered forsterite sand with the particle size of 5-3 mm;
10-20% of sintered forsterite sand with the grain diameter of 3-1 mm;
15-25% of sintered forsterite sand with the particle size of 1-0 mm;
10-15% of sintered forsterite fine powder with the particle size of 200 meshes;
10-15% of sintered magnesia fine powder with the particle size of 200 meshes;
the pulp waste liquor accounting for 1-5% of the total mass of the raw materials of the sintered forsterite kiln lining brick is used as a bonding agent;
the preparation method of the sintered forsterite kiln lining brick comprises the following specific operation steps:
step one, putting sintered forsterite sand with the particle size of 8-5mm, sintered forsterite sand with the particle size of 5-3mm, sintered forsterite sand with the particle size of 3-1mm and sintered forsterite sand with the particle size of 1-0mm into a mixing mill together by mass percent, and mixing and milling for 10-30min to obtain a mixed material;
step two, adding paper pulp waste liquor accounting for 1-5% of the total mass of the raw materials of the sintered forsterite kiln lining brick as a binding agent, adding the paper pulp waste liquor into the mixed material obtained in the step one, and carrying out mixed grinding for 10-30 min; adding the sintered forsterite fine powder with the particle size of 200 meshes and the sintered magnesia fine powder with the particle size of 200 meshes into a mixing mill, and mixing and milling for 10-30 min; obtaining mixed and ground pug;
pouring the mixed and ground pug into a mold, and pressing and molding by a semi-dry method to obtain a sintered forsterite kiln lining brick green body;
drying the sintered forsterite kiln lining brick green body in a drying kiln at 120-200 ℃ for 10-30 hours to obtain a dried sintered forsterite kiln lining brick green body;
and fifthly, placing the dried sintered forsterite kiln lining brick green body on a kiln trolley, and calcining for 10-15 hours in a 1300-1600 ℃ tunnel kiln to obtain the sintered forsterite kiln lining brick.
2. The sintered forsterite kiln liner brick for the rotary cement kiln preheating zone as claimed in claim 1, wherein the sintered forsterite sand is prepared from high-silicon magnesite or low-grade magnesite flotation tailings by high-temperature calcination.
3. The sintered forsterite lining brick for the preheating zone of a rotary cement kiln as claimed in claim 1, wherein the MgO content of the sintered forsterite sand and the sintered forsterite fine powder in the first and second steps is 50-65%; the MgO content in the sintered magnesite fine powder is 85-90%.
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Cited By (1)
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