CN112876198B - Coating for baking-free coke tank lining plate and using method thereof - Google Patents

Coating for baking-free coke tank lining plate and using method thereof Download PDF

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Publication number
CN112876198B
CN112876198B CN202110345512.1A CN202110345512A CN112876198B CN 112876198 B CN112876198 B CN 112876198B CN 202110345512 A CN202110345512 A CN 202110345512A CN 112876198 B CN112876198 B CN 112876198B
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coating
lining plate
coke
baking
free
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CN112876198A (en
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徐国涛
盛军波
涂红兵
冯强
王大春
张洪雷
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C04B2111/00525—Coating or impregnation materials for metallic surfaces
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/76—Use at unusual temperatures, e.g. sub-zero
    • C04B2111/763—High temperatures

Abstract

The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: 25-45% of microcrystalline glass powder; mullite powder: 50-60%; 0.1-2% of potassium silicate; 5-15% of alkaline silica sol with 27-40% of silicon oxide; 0.1-3% of calcium aluminate cement; the using method comprises the following steps: coating paint on a baking-free coke tank lining plate; naturally drying; heating; preserving heat; and (5) standby. The invention contains a layer of coating containing a glaze layer on the basis of the refractory lining plate and does not need to be fired specially; the problems that the lining plate of the coke tank is stuck with coke and is easy to burn and drop are solved, the thermal cycle time of air cooling from 1100 ℃ to room temperature is not less than 120 times, and the damaged area is not more than 10% after the cycle; the baking-free coating does not generate the phenomenon of flowing at 1100 ℃, so that the service life of the coke pot lining plate is prolonged from 3 months to more than 6 months, and the temperature of the outer surface of the coke pot is reduced to be not lower than 200 ℃.

Description

Coating for baking-free coke tank lining plate and using method thereof
Technical Field
The invention relates to the technical field of dry quenching in the coking industry, in particular to a coating for a baking-free coke tank lining plate and a using method thereof.
Background
Compared with wet quenching, the dry quenching technology (CDQ) has obvious advantages, can recover the sensible heat of red coke, improve the coke strength, is beneficial to the iron-making operation of a blast furnace and reduces the coke ratio. The dry quenching device has long service life, and if the dry quenching production volume of an enterprise is not surplus, the iron-making production is influenced when the production is required to be stopped for maintenance due to reasons, and even the normal production of iron-making can not be ensured.
Due to the continuous operation of the coke dry quenching system, the coke drum, which is in direct contact with the red coke, must have a high operational reliability. Therefore, the straight section of the coke pot lining plate is made of heat-resistant iron castings, such as QT600-3, G35Cr24Ni7, ZG3Cr7Si2 or heat-resistant stainless steel 20X23H 18; the cone section and the bottom gate part lining plate are made of heat-resistant cast steel ZG35Cr24Ni7SiN, heat-resistant stainless steel 20X23H18, and the like. And the lining plate of the coke tank part is made of heat-resistant stainless steel. The above-mentioned material has good wear resistance and heat resistance, and can resist 1100 deg.C in short time. However, coke oven sometimes has over-production phenomenon of coke, and the coke produced or the coke on the oven head contains tar which can be adhered on the lining plate of the coke tank, so that the lining plate is burnt and damaged, thereby affecting the turnover of the coke tank.
In the prior art, 2520 cast steel casting blocks are used for dry quenching rotary coke tank lining plates, and the dry quenching rotary coke tank lining plates are required to be integrally replaced after being used for 0.5-1 year on average. Due to the problems of materials and production operation, coke of a furnace end with a part of furnace number is generated to cause a coke tank of a cake coke, a lining plate is burnt for a long time, the local replacement of the lining plate of the coke tank is too frequent, and the maintenance cost is high; frequent replacement of the lining plates results in reduced dry quenching rate, reduced steam yield and reduced coke quality. If the damaged lining plate falls into the dry quenching furnace, the health of the maintainers can be seriously threatened in the treatment process. The bottom welt easily drops, causes the direct burnt cage structure that loses of red burnt, and life is shorter. Generally, a maintainer needs to stop the machine for overhauling the lower structure of the focusing cage frame once in 1-2 months, and is forced to adopt a watering cooling mode to cool the focusing cage due to the time and heavy task, and the quenching and suddenly heating of the lining plate and the structure of the focusing cage are greatly damaged. Frequent overhaul causes equipment materials, the cost of labor to be in the high consumption state all the time, and the structure warp after repairing repeatedly and is difficult to rectify seriously, leads to the welt installation difficulty, and vicious circle also can shorten the life of cage by a wide margin.
The coke dry quenching tank also adopts composite lining plates, but the lining plates have gaps, so that the fire is easy to generate, and the nano coating is not resistant to rapid cooling and rapid heating, is easy to peel off and has larger difference with the metal expansion coefficient.
After retrieval:
the document with Chinese patent publication No. CN110643377A is a maintenance-free dry quenching coke tank: the cylindrical structure in the outer layer structure of the coke tank is only used as an integral structure, and the inverted frustum-shaped cylinder body part is also of an integral structure. Although a support frame is not needed, the outer layer structure is made of steel plates, the inner layer of the coke pot is made of refractory materials and is tightly attached to the outer layer, but the casting layer of the cylindrical body and the circular truncated cone body of the inner layer has different densities and thicknesses and can adapt to the impact strength of different parts, so that the steel plate of the whole shell is difficult to be formed by alloy or heat-resistant cast iron, the casting material is difficult to be uniformly constructed, and the steel plate and the steel shell are easy to peel and crack due to different expansion coefficients after long-term use.
The Chinese patent publication No. CN109704792A is a castable for manufacturing a coke pot lining and a method for manufacturing the coke pot lining, and the castable comprises the following components in percentage by weight: high bauxite with a particle size in the range of 5mm to 8 mm: 10% -22%; calcium hexaluminate having a particle size in the range of 3mm to 5 mm: 20% -38%; calcined quartz with a particle size in the range of 1mm to 3 mm: 6 to 10 percent; forsterite having a particle size of 1mm or less: 11 to 21 percent; magnesium aluminate spinel with 180 mesh particle size: 9% -19%; ethyl silicate: 2% -7%; hydrated alumina with particle size less than 0.088 mm: 2% -10%; dextrin: 1% -4%; water reducing agent: 1 to 3 percent. The high-alumina bauxite has poor rapid cooling and heating resistance due to the addition of the high-alumina bauxite, and the casting material is easy to damage; and the combination of ethyl silicate and hydrated alumina is added, so that the coke tank lining has low strength and is not wear-resistant.
The Chinese patent publication No. CN110668832A, the wear-resistant castable for coke pots comprises: alumina: 30-68 parts of a solvent; the granularity of the alumina is less than or equal to 5 mm; alumina hollow spheres: 10-45 parts; the granularity of the alumina hollow sphere is less than or equal to 3 mm; alumina micropowder: 1-5 parts; silicon micropowder: 5-12 parts of a solvent; pure calcium aluminate cement: 3-10 parts; dispersing agent: 0.1-1 part; explosion-proof agent: 0.1-1 part; tartaric acid: 0.02-0.03 part. It has good compressive strength, rupture strength and wear resistance; however, the hollow spheres are too many, alumina is taken as a main component, and the properties of rapid cooling and rapid heating are poor, so the hollow spheres are easy to peel off.
The Chinese patent publication No. CN201210092701.3 discloses a glazed brick for a coke oven door, which comprises a brick body and glaze coated on the surface of the brick body, and is characterized in that the glaze comprises the following components in parts by weight: 45-55 parts of feldspar, 5-15 parts of quartz, 10-18 parts of stalactite, 0-6 parts of cooked talc, 0-4 parts of Suzhou soil, 1-8 parts of alumina, 10-20 parts of zircon powder and 3-8 parts of barium carbonate. The phenomenon of free carbon particles and tar penetration adhesion can be reduced, the carbon deposition condition on the surface of the coke oven door is obviously improved in the using process, the average monthly cleaning frequency is 2-4, the cleaning frequency and the cleaning difficulty of the carbon deposition on the coke oven door are effectively reduced, and the mechanical damage to the coke oven door in the cleaning process is effectively reduced. The zirconium oxide in the zircon powder has reversible phase change of the zirconium oxide with different crystal phases, so that the zirconium oxide is easy to crack in the repeated temperature rise and fall process, the frequency of the usage of the coke tank can reach 70 times a day, and the frequency of the usage of the coke tank can reach over ten thousand times in half a year, so the zirconium-containing glaze is not suitable for being used as a coke tank lining plate.
The Chinese patent publication No. CN200410023580.2 discloses a glaze for a coke oven door brick and a manufacturing method thereof, which is characterized in that the main raw materials are as follows: 80-120 meshes of spodumene and 35-65 percent of spodumene; 2-10% of clay fine powder; pyrophyllite 200 meshes 15-53%; 200-mesh feldspar 0-10%; 0-1% of fine sodium tripolyphosphate powder; the surface smoothness of the coke oven door bricks can be improved, and the adhesion and conglutination between the coke oven door bricks and tar can be prevented or reduced, so that the tar can be easily removed, and the using conditions of the coke oven door bricks can be met. Because the melting points of spodumene and feldspar are low, glaze flowing is easily generated when the glaze is used in a coke can at 1050 +/-50 ℃, the frequency of the use of the coke can reach 70 times a day, and the use can reach ten thousand times in half a year, so the low-melting-point glaze is not suitable for being used as a coke can lining plate.
Chinese patent publication No. CN201410070710.1, which discloses a glaze for lining bricks of coke oven doors and a using method thereof, and is characterized in that 50-65 wt% of spodumene fine powder, 15-25 wt% of cordierite fine powder and 20-30 wt% of borax fine powder are mixed uniformly to prepare the glaze for lining bricks of coke oven doors; mixing glaze and water according to the mass ratio of 1 (0.45-0.5), and stirring for 0.4-0.6h to prepare slurry; spraying the prepared slurry on the surface of a lining brick of the coke oven door by using a spray gun, wherein the coating thickness is 0.5-1 mm; then closing the oven door, and preserving heat for 1-3h at 950-1100 ℃, so that the glaze can be generated on the surface of the lining brick of the oven door of the coke oven. The invention has the advantages of low cost, simple process, convenient construction and low glaze forming temperature, and the prepared glaze has excellent carbon deposit resistance and thermal shock stability and is suitable for the door of the coke oven. Because the melting points of spodumene and borax are low, glaze flowing is easily generated when the glaze is used in a coke tank at 1050 +/-50 ℃, the frequency of the use of the coke tank in one day can reach 70 times, and the frequency of the use of the coke tank in half a year can reach ten thousand times, so that the low-melting-point glaze is not suitable for being used as a lining plate of the coke tank.
The Chinese patent publication No. CN201710398266.X, the high-temperature ceramic glaze for the large-scale cast and sintered furnace door brick and the preparation method thereof are characterized in that the high-temperature ceramic glaze comprises the following raw materials: 5-8 parts of feldspar, 40-45 parts of spodumene powder, 20-30 parts of fused quartz powder, 7-13 parts of alpha alumina micropowder, 5-10 parts of raw talcum powder, 2-5 parts of zirconium dioxide, 2-5 parts of zinc oxide and 48-70 parts of water. The expansion coefficient of the glaze is reduced, the glaze has good compactness, and the air permeability is greatly reduced, so that the glaze can resist the damage caused by carbon and harmful substances entering the furnace door brick body in the working process. The glazed brick is a solid brick, so that it is compact, and when the glazed firing temp. is high, the base body is not easy to shrink, and the size of the brick can be easily controlled. The zirconium oxide in the zircon powder has reversible phase change of the zirconium oxide with different crystal phases, so that the zirconium oxide is easy to crack in the repeated temperature rise and fall process, the frequency of the usage of the coke tank can reach 70 times a day, and the frequency of the usage of the coke tank can reach over ten thousand times in half a year, so the zirconium-containing glaze is not suitable for being used as a coke tank lining plate. Because the melting points of spodumene and borax are low, glaze flowing is easily generated when the glaze is used in a coke pot at 1050 +/-50 ℃, and the glaze is not suitable for being used as a lining plate of the coke pot.
The coke pot lining plate is mostly prepared by high-porosity ratio due to the heat preservation requirement, and if the coke pot lining plate is glazed and fired, shrinkage is easy to generate. The lining plate is different from a coke oven door, the heat transfer is fast, if baked bricks are used, a steel structure is easy to damage, prefabricated unburnt casting materials are used, and glaze is difficult to bake, so that the coating coke tank lining plate containing a glaze layer and not scorched needs to be developed to meet the production requirement.
Disclosure of Invention
The invention aims to solve the problems of easy scorching and burning loss, shedding and difficult glazing of a refractory lining plate in the prior art in the field, and provides a coating which is coated with glaze on the basis of the refractory lining plate and does not need special firing, so that the problems of scorching, easy burning loss and shedding of the coke pot lining plate are solved, the thermal cycle frequency of air cooling from 1100 ℃ to room temperature is not less than 120 times, and the damaged area is not more than 10 percent after the cycle; the baking-free coating does not generate the phenomenon of flowing at 1100 ℃, so that the service life of the coke tank lining plate is prolonged from 3 months to more than 6 months, and the temperature of the outer surface of the coke tank is reduced to be not lower than 200 ℃.
The technical measures for realizing the purpose are as follows:
the coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 25-45%; mullite powder with the granularity less than or equal to 0.045 mm: 50-60%; potassium silicate with particle size less than or equal to 0.045 mm: 0.1-2%; alkaline silica sol with a silica content of 27-40%: 5-15%; calcium aluminate cement: 0.1-3%; the use performance requirement is as follows: the using temperature is not lower than 1100 ℃; the number of thermal cycles of air cooling at 1100 ℃ to room temperature is not less than 120, and the area of damage after the cycle is not more than 10%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
Preferably: the microcrystalline glass powder with the granularity less than or equal to 0.045mm comprises the following components in percentage by weight: 29-42%.
It is characterized in that: the microcrystalline glass powder with the granularity less than or equal to 0.045mm comprises the following components in percentage by weight: b is2O3：6％～13％；SiO2：55％～65％；Al2O3：6％～15％；Na2O：10％～16％；K2O: 2% -5%; the melting point of the material is not lower than 900 ℃; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, uniformly coating the coating on the inner wall surface of the lining plate, continuously vibrating for less than 1 minute, and controlling the thickness of the coating to be less than or equal to 2 mm;
2) naturally drying the baking-free coke pot lining plate with the coating;
3) heating is carried out; stopping heating when the heating temperature reaches 300-500 ℃;
4) carrying out heat preservation at the temperature of 300-500 ℃, wherein the heat preservation time is not less than 2 h;
5) and (5) standby.
The mechanism and action of each element and main process of the invention are as follows:
the invention adopts the microcrystalline glass powder with the granularity less than or equal to 0.045mm, and controls the adding amount to be 25-45% because the microcrystalline glass powder starts to be soft-melted at the medium temperature, the melting point is not low, and the microcrystalline glass powder has certain bonding strength and can promote the bonding and sintering of the matrix.
The invention adopts the mullite powder with the granularity less than or equal to 0.045mm, and controls the adding amount to be 50-60 percent, because the mullite has good thermal destruction resistance and high refractoriness, and can play the role of high-temperature resistant basic components of the glaze layer.
The invention adopts the potassium silicate with the granularity less than or equal to 0.045mm, and controls the adding amount to be 0.1-2%, because the potassium silicate can play a role of a bonding agent at a low temperature to a use temperature, the coating is ensured to have certain strength.
The invention adopts the alkaline silica sol with 27-40% of silicon oxide content, and controls the adding amount to be 5-15%, because the silica sol can play the role of a medium-high temperature bonding agent, the coating is ensured to have certain high-temperature strength.
The calcium aluminate cement is adopted, and the addition amount of the calcium aluminate cement is controlled to be 0.1-3%, because the calcium aluminate cement can play a role in promoting a coagulator and can generate an interface bonding strength with a substrate of the lining plate.
When the invention is used, the coating is uniformly coated on the surface of the inner wall of the lining plate after the inner wall surface of the lining plate is upwards vibrated and formed in the process of forming the lining plate of the non-burning coke tank, the vibration is continued for less than 1 minute, and the thickness of the coating is controlled to be less than or equal to 2mm, because the basic appearance of the lining plate is already stable but is not dried after the inner wall surface of the lining plate is upwards vibrated and formed in the process of forming the lining plate of the non-burning coke tank, the coating is uniformly coated on the surface of the inner wall surface of the lining plate at the moment, the vibration is continued for less than 1 minute, and the thickness of the coating is less than or equal to 2 mm; a compact combination can be formed at the interface of the coating and the lining plate, the two components can mutually permeate, the coating can be stably attached to the surface of the lining plate, and the lining plate becomes a whole after being dried and baked.
Compared with the prior art, the invention contains a layer of coating containing a glaze layer on the basis of the refractory lining plate, and does not need special firing, thereby not only solving the problems of coke sticking, coke burning, easy burning loss and shedding of the coke tank lining plate, but also ensuring that the thermal cycle time of air cooling from 1100 ℃ to room temperature is not less than 120 times, and the damaged area after the cycle is not more than 10 percent; the baking-free coating does not generate the phenomenon of flowing at 1100 ℃, so that the service life of the coke pot lining plate is prolonged from 3 months to more than 6 months, and the temperature of the outer surface of the coke pot is reduced to be not lower than 200 ℃.
Drawings
FIG. 1 is a topographical view of a coke pot liner glaze layer after practice of the present invention.
Detailed Description
The invention is further described below
Example 1
The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 25.5 percent; mullite powder with the granularity less than or equal to 0.045 mm: 59 percent of water; potassium silicate with particle size less than or equal to 0.045 mm: 0.2 percent; alkaline silica sol with 29% silica content: 15 percent; calcium aluminate cement: 0.3 percent; coating the coating composed of the raw materials on the surface of a lining plate which is just formed, processing to obtain the coke pot composite lining plate containing the coating, installing the coke pot composite lining plate on a coke pot for use, and sintering and compacting the coating while producing under the action of the use temperature.
The microcrystalline glass powder with the granularity less than or equal to 0.045mm has the component composition and the weight percentage content of B2O3：9.2％；SiO2：65.8％；Al2O3：9％；Na2O：13％；K2O: 3 percent; its melting point is 917 deg.C; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, the coating is uniformly coated on the surface of the inner wall surface of the lining plate, the vibration is continued for 30 seconds, and the thickness of the coating is 1 mm.
2) Drying the baking-free coke pot lining plate with the coating, demoulding, and naturally drying;
3) heating is carried out; stopping heating when the heating temperature reaches 350 ℃;
4) preserving heat at 350 ℃ for 3 h;
5) and (5) standby.
Through detection, the phenomenon of coke sticking and scorching, and the phenomenon of burning loss and shedding are not found in the embodiment after trial for 6.5 months; the temperature of the outer surface of the coke pot shell is reduced by 201.3 ℃; the use performance requirement is as follows: the use temperature is 1106 ℃; the number of thermal cycles of air cooling from 1100 ℃ to room temperature is 121, and the damaged area after 121 cycles is 1.5%; the burn-free coating does not generate a flow phenomenon at 1106 ℃.
Example 2
The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 41 percent; mullite powder with the granularity less than or equal to 0.045 mm: 51 percent; potassium silicate with particle size less than or equal to 0.045 mm: 1.5 percent; alkaline silica sol with a silica content of 36%: 5.5 percent; calcium aluminate cement: 1.0 percent; coating the coating composed of the raw materials on the surface of a lining plate which is just formed, processing to obtain the coke pot composite lining plate containing the coating, installing the coke pot composite lining plate on a coke pot for use, and sintering and compacting the coating while producing under the action of the use temperature.
The microcrystalline glass powder with the granularity less than or equal to 0.045mm has the component composition and the weight percentage content of B2O3：10％；SiO2：61％；Al2O3：12.5％；Na2O：12％；K2O: 4.5 percent; the melting point is 1065 ℃; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, the coating is uniformly coated on the surface of the inner wall surface of the lining plate, the vibration is continued for 15 seconds, and the thickness of the coating is 1.5 mm.
2) Drying the baking-free coke pot lining plate with the coating, demoulding, and naturally drying;
3) heating is carried out; stopping heating when the heating temperature reaches 400 ℃;
4) preserving heat at 400 ℃ for 3.5 h;
5) and (5) standby.
Through detection, the phenomenon of coke sticking and scorching, and the phenomenon of burning loss and shedding are not found in the embodiment after trial for 7 months; the temperature of the outer surface of the coke tank shell is reduced by 220 ℃; the use performance requirement is as follows: the use temperature is 1150 ℃; the number of thermal cycles of air cooling from 1100 ℃ to room temperature is 121, and the damaged area after 121 cycles is 2.0%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
Example 3
The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 33.2 percent; mullite powder with the granularity less than or equal to 0.045 mm: 55 percent; potassium silicate with particle size less than or equal to 0.045 mm: 1.9 percent; alkaline silica sol with a silica content of 30%: 7 percent; calcium aluminate cement: 2.9 percent; coating the coating composed of the raw materials on the surface of a lining plate which is just formed, processing to obtain the coke pot composite lining plate containing the coating, installing the coke pot composite lining plate on a coke pot for use, and sintering and compacting the coating while producing under the action of the use temperature.
The microcrystalline glass powder with the granularity less than or equal to 0.045mm has the component composition and the weight percentage content of B2O3：12％；SiO2：62.5％；Al2O3：10.5％；Na2O：12.5％；K2O: 2.5 percent; its melting point is 1035 ℃; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, the coating is uniformly coated on the surface of the inner wall surface of the lining plate, and the vibration is continued for 45 seconds, wherein the thickness of the coating is 1.2 mm.
2) Drying the baking-free coke pot lining plate with the coating, demoulding, and naturally drying;
3) heating is carried out; stopping heating when the heating temperature reaches 380 ℃;
4) preserving heat at 380 ℃ for 2.5 h;
5) and (5) standby.
Through detection, the phenomenon of coke sticking and scorching, and the phenomenon of burning loss and shedding are not found in the embodiment after trial for 7.5 months; the temperature of the outer surface of the coke pot shell is reduced by 280 ℃; the use performance requirement is as follows: the use temperature is 1105 ℃; the number of thermal cycles of air cooling from 1100 ℃ to room temperature is 121, and the damaged area after 121 cycles is 3.5%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
Example 4
The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 32.5 percent; mullite powder with the granularity less than or equal to 0.045 mm: 50.5 percent; potassium silicate with particle size less than or equal to 0.045 mm: 1.0 percent; alkaline silica sol with a silica content of 35%: 14.5 percent; calcium aluminate cement: 1.5 percent; coating the coating composed of the raw materials on the surface of a lining plate which is just formed, processing to obtain the coke pot composite lining plate containing the coating, installing the coke pot composite lining plate on a coke pot for use, and sintering and compacting the coating while producing under the action of the use temperature.
The microcrystalline glass powder with the granularity less than or equal to 0.045mm has the component composition and the weight percentage content of B2O3：9.5％；SiO2：60％；Al2O3：12.5％；Na2O：14％；K2O: 4 percent; its melting point is 985 ℃; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, the coating is uniformly coated on the surface of the inner wall surface of the lining plate, the vibration is continued for 25 seconds, and the thickness of the coating is 1.2 mm.
2) Drying the baking-free coke pot lining plate with the coating, demoulding, and naturally drying;
3) heating is carried out; stopping heating when the heating temperature reaches 320 ℃;
4) preserving heat at 320 ℃ for 5 h;
5) and (5) standby.
Through detection, the phenomenon of coke sticking and scorching, and the phenomenon of burning loss and shedding are not found in the embodiment after trial for 7 months; the temperature of the outer surface of the coke pot shell is reduced by 230 ℃; the use performance requirement is as follows: the use temperature is 1105 ℃; the number of thermal cycles of air cooling from 1100 ℃ to room temperature is 121, and the damaged area after 121 cycles is 6.5%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
Example 5
The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 35 percent; mullite powder with the granularity less than or equal to 0.045 mm: 52 percent; potassium silicate with particle size less than or equal to 0.045 mm: 1.2 percent; alkaline silica sol with a silica content of 38%: 10 percent; calcium aluminate cement: 1.8 percent; coating the coating composed of the raw materials on the surface of a lining plate which is just formed, processing to obtain the coke pot composite lining plate containing the coating, installing the coke pot composite lining plate on a coke pot for use, and sintering and compacting the coating while producing under the action of the use temperature.
The microcrystalline glass powder with the granularity less than or equal to 0.045mm has the component composition and the weight percentage content of B2O3：11.5％；SiO2：64％；Al2O3：11％；Na2O：10.5％；K2O: 3 percent; the melting point is 1010 ℃; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, the coating is uniformly coated on the surface of the inner wall surface of the lining plate, the vibration is continued for 50 seconds, and the thickness of the coating is 1.3 mm.
2) Drying the baking-free coke pot lining plate with the coating, demoulding, and naturally drying;
3) heating is carried out; stopping heating when the heating temperature reaches 420 ℃;
4) preserving heat at 420 ℃ for 3.5 h;
5) and (5) standby.
Through detection, the phenomenon of coke sticking and scorching, and the phenomenon of burning loss and shedding are not found in the embodiment after trial for 8 months; the temperature of the outer surface of the coke pot shell is reduced by 260 ℃; the use performance requirement is as follows: the use temperature is 1120 ℃; the number of thermal cycles of air cooling from 1100 ℃ to room temperature is 121, and the damaged area after 121 cycles is 7.5%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
Example 6
The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 30 percent; mullite powder with the granularity less than or equal to 0.045 mm: 59 percent of water; potassium silicate with particle size less than or equal to 0.045 mm: 0.8 percent; alkaline silica sol with a silica content of 36%: 9 percent; calcium aluminate cement: 1.2 percent; coating the coating composed of the raw materials on the surface of a lining plate which is just formed, processing to obtain the coke pot composite lining plate containing the coating, installing the coke pot composite lining plate on a coke pot for use, and sintering and compacting the coating while producing under the action of the use temperature.
The microcrystalline glass powder with the granularity less than or equal to 0.045mm has the component composition and the weight percentage content of B2O3：11％；SiO2：63％；Al2O3：9.5％；Na2O：13％；K2O: 3.5 percent; the melting point is 965 ℃; it is produced by conventional method.
A use method of a coating for a baking-free coke tank lining plate comprises the following steps:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, the coating is uniformly coated on the surface of the inner wall surface of the lining plate, the vibration is continued for 40 seconds, and the thickness of the coating is 1.1 mm.
2) Drying the baking-free coke pot lining plate with the coating, demoulding, and naturally drying;
3) heating is carried out; stopping heating when the heating temperature reaches 330 ℃;
4) preserving heat at 330 ℃ for 4 h;
5) and (5) standby.
Through detection, the phenomenon of coke sticking and scorching, and the phenomenon of burning loss and shedding are not found in the embodiment after trial for 6.5 months; the temperature of the outer surface of the coke pot shell is reduced by 230 ℃; the use performance requirement is as follows: the use temperature is 1110 ℃; the number of thermal cycles of air cooling from 1100 ℃ to room temperature is 121, and the damaged area of the film after 121 cycles is 8.5%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
The above embodiments are only preferred embodiments, and are not intended to limit the technical solutions of the present invention.

Claims (4)

1. The coating for the baking-free coke tank lining plate comprises the following raw materials in percentage by weight: microcrystalline glass powder with the granularity less than or equal to 0.045 mm: 25-45%; mullite powder with the granularity less than or equal to 0.045 mm: 50-60%; potassium silicate with particle size less than or equal to 0.045 mm: 0.1-2%; alkaline silica sol with a silica content of 27-40%: 5-15%; calcium aluminate cement: 0.1-3%; the use performance requirement is as follows: the using temperature is not lower than 1100 ℃; the number of thermal cycles of air cooling at 1100 ℃ to room temperature is not less than 120, and the area of damage after the cycle is not more than 10%; the baking-free coating does not generate a flow phenomenon at 1100 ℃.
2. The coating for the baking-free coke can lining board as claimed in claim 1, wherein: the microcrystalline glass powder with the granularity less than or equal to 0.045mm comprises the following components in percentage by weight: 29-42%.
3. The coating for the baking-free coke pot lining plate as claimed in claim 1 or 2, wherein: the microcrystalline glass powder with the granularity less than or equal to 0.045mm comprises the following components in percentage by weight: b is2O3 ：6％～13％；SiO2：55％～65％；Al2O3 ：6％～15％；Na2O： 10％～16％；K2O: 2% -5%; the melting point of the alloy is not lower than 900 ℃.
4. The use method of the coating for the baking-free coke can lining plate as claimed in claim 1, which comprises the steps of:
1) in the process of forming the baking-free coke tank lining plate, after the inner wall surface of the lining plate faces upwards and is subjected to vibration forming, uniformly coating the coating on the inner wall surface of the lining plate, continuously vibrating for no more than 1 minute, and controlling the thickness of the coating to be less than or equal to 2 mm;
2) naturally drying the baking-free coke pot lining plate with the coating;
3) heating is carried out; stopping heating when the heating temperature reaches 300-500 ℃;
4) carrying out heat preservation at the temperature of 300-500 ℃, wherein the heat preservation time is not less than 2 h;
5) and (5) standby.
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CN114621017B (en) * 2022-03-24 2022-11-11 武汉钢铁有限公司 Microporous refractory material lining plate for coke pot bottom gate and preparation method thereof
CN114621776B (en) * 2022-03-24 2023-05-16 武汉钢铁有限公司 Coke tank bottom gate lining plate compounded with high-temperature ceramic piece and preparation method

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