CN111116218A - Acid-corrosion-resistant high-strength combined block for circulating fluidized bed boiler lining - Google Patents

Acid-corrosion-resistant high-strength combined block for circulating fluidized bed boiler lining Download PDF

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Publication number
CN111116218A
CN111116218A CN202010099665.8A CN202010099665A CN111116218A CN 111116218 A CN111116218 A CN 111116218A CN 202010099665 A CN202010099665 A CN 202010099665A CN 111116218 A CN111116218 A CN 111116218A
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block
parts
fluidized bed
dismantling
corrosion
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李辉东
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Gongyi Ruidong Refractory Co Ltd
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Gongyi Ruidong Refractory Co Ltd
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Priority to CN202010099665.8A priority Critical patent/CN111116218A/en
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    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
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    • C04B35/10Shaped 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23MCASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
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Abstract

The invention relates to an acid-corrosion-resistant high-strength combined block for a circulating fluidized bed boiler lining, which effectively solves the problems that the existing castable for the fluidized bed boiler lining is not easy to sinter, has poor acid-corrosion resistance and wear resistance, is easy to crack, is not easy to construct, is easy to crack at brick joints and is not easy to maintain after cracking in the use process; the main components of the composite material comprise 30-50 parts of compact alumina, 5-10 parts of kyanite, 10-20 parts of flint clay, 5-8 parts of active alpha alumina micropowder, 3-5 parts of zircon powder, 5-10 parts of silicon carbide powder, 3-5 parts of silicon nitride powder, 2-5 parts of pure calcium aluminate cement, 1 part of wear-resistant steel fiber, 0.5-1 part of special additive B and phosphate as a bonding additive; the invention adopts the combined splicing type combined brick and is provided with the dismantling block and the mosaic body, thereby effectively solving the problems that the lining of the existing fluidized bed boiler is difficult to construct, cracks are easy to generate at the brick joints, and the maintenance is difficult after the cracks are cracked, and having low cost and strong practicability.

Description

Acid-corrosion-resistant high-strength combined block for circulating fluidized bed boiler lining
Technical Field
The invention relates to the technical field of boiler linings, in particular to an acid-corrosion-resistant high-strength combined block for a boiler lining of a circulating fluidized bed.
Background
The existing circulating fluidized bed boiler lining is poured by adopting a bottom pouring material, and an upper high-alumina brick and clay brick are in a brick-built structure, and the circulating fluidized bed boiler lining has the following defects:
the use temperature in the furnace is low, the castable is not easy to sinter in the use process, and has poor acid corrosion resistance and wear resistance and easy cracking;
the space in the furnace is small, and a mold is not easy to support and construct in the pouring process;
the clearance height inside the circulating fluidized bed boiler is more than 30 meters, cracks are easily generated at brick joints due to temperature difference changes in the using process of high-alumina bricks and clay bricks, a small part of bricks at the lower part are cracked due to overlarge pressure, air and fire can leak out of the boiler along with the increase of the cracks, and the maintenance frequency of the boiler is accelerated;
the service life is short, the maintenance is not easy, the castable is dismantled, the secondary pouring period is long, the furnace is stopped for maintenance in 2-3 months on average, the maintenance is carried out for 15 days each time, and the labor and the time are wasted.
Therefore, the invention provides an acid-corrosion-resistant high-strength combined block for a circulating fluidized bed boiler lining to solve the problems.
Disclosure of Invention
Aiming at the situation and overcoming the defects of the prior art, the invention provides the acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining, which effectively solves the problems that the existing castable for the fluidized bed boiler lining is difficult to sinter, poor in acid corrosion resistance and wear resistance, easy to crack, difficult to construct, easy to crack at brick joints and difficult to maintain after cracking in the using process.
The main components of the invention comprise 30-50 parts of compact alumina, 5-10 parts of kyanite, 10-20 parts of flint clay, 5-8 parts of active alpha alumina micropowder, 3-5 parts of zircon powder, 5-10 parts of silicon carbide powder, 3-5 parts of silicon nitride powder, 2-5 parts of pure calcium aluminate cement, 1 part of wear-resistant steel fiber, 0.5-1 part of special additive B and phosphate as a bonding additive;
the production process comprises the following steps:
1. designing a combined steel tire mold according to the size of the furnace;
2. adding water into the raw materials, and uniformly stirring the raw materials by using a forced stirrer, wherein the amount of the added water is 12-15% of the amount of the raw materials;
3. pouring the stirred raw materials into a mould, and placing the mould on a vibration table to vibrate to a slurry turning position;
4. putting the mould and the mould into a normal temperature furnace at 40 ℃ for 2 hours for demoulding;
5. naturally drying for 8 hours;
6. sintering in a medium-temperature baking kiln to 900 ℃;
7. taking out and cooling to obtain the finished product.
Preferably, step 3 is to brush oil on the inner side wall and the bottom surface of the mold before pouring the raw materials into the mold.
Preferably, in the step 6, the temperature of the medium-temperature baking kiln is gradually increased at a speed of 5 ℃/hour, the temperature in the kiln is kept for 8-12 hours after the temperature in the kiln reaches 110 ℃, then the temperature is continuously increased, and the temperature in the kiln is kept for 3 hours after the temperature in the kiln reaches 900 ℃.
Preferably, the boiler lining is formed by splicing dismantling blocks, the dismantling blocks are of a cubic brick structure, the upper end faces of the dismantling blocks face the inner side of the boiler, one end of each dismantling block, facing the side wall of the boiler, is fixedly connected with an upper clamping body, the lower end faces of the dismantling blocks face a lower clamping body, each dismantling block is buckled up and down to form the boiler lining, and the upper clamping body of each dismantling block and the lower clamping body of an adjacent dismantling block are buckled and spliced during splicing;
demolish the slabby mosaic of fixedly connected with in the piece, the mosaic will demolish the piece and divide into the three-layer and from last to being upper strata, mosaic, lower floor down in proper order.
Preferably, the device also comprises a conventional block, the external shape of the conventional block is the same as that of the dismantling block, and the conventional block does not contain an mosaic body;
the assembling form of the conventional blocks and the dismantling blocks is that two conventional blocks are arranged between the two dismantling blocks.
Preferably, the conventional block and the demolition block have a curvature when used as a lower arc portion lining of the boiler so as to be attached to an inner wall surface of the boiler.
Preferably, the mosaic body is in the shape of an inclined plate, and one end of the mosaic body facing the inner side of the boiler is high.
Preferably, the maintenance block comprises an independent maintenance block and an independent mosaic block which are the same as the shapes of the upper layer and the lower layer.
The invention adopts the combined splicing type combined brick and is provided with the dismantling block and the mosaic body, thereby effectively solving the problems that the lining of the existing fluidized bed boiler is difficult to construct, cracks are easy to generate at the brick joints, and the maintenance is difficult after the cracks are generated, and having the following advantages:
1. various raw materials are combined to resist acid corrosion, peeling, high strength and abrasion;
2. the combined structure is adopted, the blocks are combined and buckled, the refractory mortar is not needed to fill gaps, the construction is easy, the field is not required to be baked, and the cracks are avoided;
3. the maintenance is convenient, after part of the blocks are damaged, the damaged blocks on the upper part can be dismounted for replacement and then embedded into the mosaic blocks on the lower part as long as the forward blocks on the lower part are dismounted, the integral structure of the boiler is not damaged, the boiler can be put into use after replacement, only 5 days are needed for each maintenance, and the time is greatly saved;
4. the combined boiler has the advantages of long service life, high economic benefit, no air leakage and fire leakage as long as the boiler body is not damaged in a large area due to the adoption of a combined structure, no need of shutdown for maintenance, high boiler utilization rate and obvious economic benefit.
Drawings
Fig. 1 is a perspective view of a removal block with a curvature according to the present invention.
Figure 2 is a schematic cross-sectional view of the arcuate demolition block of the present invention.
Fig. 3 is a perspective view of the removal block of the present invention without the arc.
Figure 4 is a cross-sectional view of the removal block of the present invention without the arc.
Fig. 5 is a perspective view of a conventional block with a curvature according to the present invention.
Fig. 6 is a perspective view of a conventional block without an arc according to the present invention.
FIG. 7 is a table of physical and chemical performance indexes of the present invention.
Detailed Description
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to figures 1 to 7. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The first embodiment of the invention relates to an acid-corrosion-resistant high-strength composite block for a circulating fluidized bed boiler lining, which is characterized by mainly comprising 30-50 parts of compact alumina, 5-10 parts of kyanite, 10-20 parts of flint clay, 5-8 parts of active alpha alumina micropowder, 3-5 parts of zircon powder, 5-10 parts of silicon carbide powder, 3-5 parts of silicon nitride powder, 2-5 parts of pure calcium aluminate cement, 1 part of wear-resistant steel fiber, 0.5-1 part of a special additive B and phosphate as a bonding additive, wherein:
the compact alumina is a main material and has the characteristics of wear resistance, corrosion resistance and high strength;
the kyanite is mainly used for enhancing the wear resistance of the composite block;
the zircon powder is mainly used for enhancing the thermal shock resistance of the combined block, and can ensure that the combined block is continuously expanded and does not shrink or shrink a little after the temperature is reduced in a high-temperature environment of a boiler, so that the combined block is prevented from cracking due to huge change of the temperature, and meanwhile, the zircon powder can also increase the anti-stripping performance of the combined block;
the silicon nitride powder is mainly used for enhancing the acid resistance of the combined block;
the strength of the pure calcium aluminate cement is greatly enhanced under the condition of high temperature;
phosphates as additives to aid in the bonding of various materials, additives commonly used in the art;
the production process comprises the following steps:
1. designing a combined steel tire mold according to the size of a furnace, and when the mold is manufactured, according to the shape of a combined block, not only a mold with the integral shape of a demolition block is manufactured, but also molds of an upper layer, a lower layer and an inlay body are independently manufactured and used for replacement when a maintenance part is demolished;
2. adding water into the raw materials, and uniformly stirring the raw materials by using a forced stirrer, wherein the amount of the added water is 12-15% of the amount of the raw materials;
3. pouring the stirred raw materials into a mould, placing the mould on a vibrating table, and vibrating the mould to a slurry turning position, wherein the slurry turning indicates that all the raw materials are uniformly stirred;
4. putting the mixture into a 40 ℃ normal temperature furnace together with a mold for 2 hours for demolding, wherein in order to facilitate demolding, before pouring the raw materials into the mold in step 3, oil is brushed on the inner side wall and the bottom surface of the mold
5. Naturally drying for 8 hours, wherein the step is used for discharging water and bubbles in air holes in the combined block to prevent bursting in the subsequent high-temperature sintering process;
6. sintering the mixture in a medium-temperature baking kiln to 900 ℃, gradually raising the temperature of the medium-temperature baking kiln at the speed of 5 ℃/hour, keeping the temperature for 8 to 12 hours after the temperature in the kiln reaches 110 ℃, then continuing raising the temperature, and keeping the temperature for 3 hours after the temperature in the kiln reaches 900 ℃;
7. taking out and cooling to obtain the finished product.
The embodiment also provides a preferable scheme that the sum of the three raw materials of the dense alumina, the kyanite and the flint clay is 68 parts, and the sum of the other raw materials is 32 parts, which specifically comprises the following steps:
45 parts of dense alumina, 8 parts of kyanite, 15 parts of flint clay, 8 parts of active alpha alumina micro powder, 5 parts of zircon powder, 7 parts of silicon carbide powder, 5 parts of silicon nitride powder, 5 parts of pure calcium aluminate cement, 1 part of wear-resistant steel fiber, 1 part of special additive B and the balance of phosphate serving as an additive.
In the second embodiment, on the basis of the first embodiment, referring to fig. 3 and 4, a boiler lining is mainly formed by splicing dismantling blocks 1, the dismantling block 1 is in a cubic brick structure, the upper end face of the dismantling block 1 faces to the inner side of a boiler, one end of the dismantling block 1 is fixedly connected with an upper clamping body 2, one end of the lower end face of the dismantling block 1 faces to the side wall of the boiler is fixedly connected with a lower clamping body 3, the end face areas of a long clamping body and the lower clamping body 3 are half of the end face area of the cubic part of the dismantling block 1, so that the dismantling blocks are convenient to splice, each dismantling block 1 is buckled up and down to form the boiler lining, the upper clamping body 2 of each dismantling block 1 is buckled and spliced with the lower clamping body 3 of the adjacent dismantling block 1 during splicing, namely, each dismantling block 1 is longitudinally spliced during splicing, the upper clamping body 2 and the lower clamping body 3 are mutually spliced to form a gapless lining structure, and when a seam between the lining structure is used by expanding bricks due to high, so that the seams between adjacent demolition blocks 1 disappear;
demolish 1 interior fixedly connected with platelike mosaic body 4 of piece, mosaic body 4 will demolish piece 1 and divide into the three-layer and from last to being the upper strata down in proper order, mosaic body 4, the lower floor, when needs are maintained, if need demolish piece 1 with a certain piece under, only need through pneumatic pick or similar instrument, smash mosaic body 4, later can demolish piece 1 with this piece and demolish and change new piece 1 of demolising, be convenient for maintenance personal location mosaic body 4's position, at mosaic body 4 and upper strata, the horizontal groove that is used for discerning is carved with in lower floor boundary department, the maintenance personal location of being convenient for.
In the third embodiment, on the basis of the second embodiment, the dismounting device further comprises a conventional block 5, the external shape of the conventional block 5 is the same as that of the dismounting block 1, the conventional block 5 does not contain an inlay 4, the conventional block 5 can be mutually spliced with the conventional block 5 and can also be mutually spliced with the dismounting block 1, and the difference is that the inlay 4 is arranged in the conventional block 5;
conventional piece 5 and the form of assembling of demolising piece 1 are two and demolish and be provided with two conventional pieces 5 between the piece 1, and because of demolising 1 manufacture craft comparatively complicacy, the cost is higher, but this setting can effectual control cost, also can effectually guarantee simultaneously that can effectually demolish when the maintenance is demolishd, has compromise building cost and cost of maintenance.
In the fourth embodiment, on the basis of the second embodiment, the conventional block 5 and the dismantling block 1 have a radian when being used as a furnace lining of a circular arc part at the lower part of the boiler, so that the conventional block and the dismantling block can be attached to the inner wall surface of the boiler, the radian is set to be used for the radian part at the bottom of the boiler and also can be used for certain parts with radians at the upper part of the boiler, and the parts are less in material consumption and can be customized according to different requirements.
In the fifth embodiment, on the basis of the second embodiment, the maintenance block and the embedded block which are independent and have the same shapes as the upper layer and the lower layer are further included, after the conventional block 5 is removed and replaced, the maintenance block which is independent and has the same shape as the lower layer and the upper layer can be installed, and then the embedded block is driven into the gap between the maintenance block and the embedded block;
the mosaic body 4 is in an inclined plate shape, one end of the mosaic body facing the inner side of the boiler is high, and the mosaic blocks can be better embedded between two independent maintenance blocks under the gravity and the pressure of an upper layer structure.
When the invention is used in concrete, the dismantling blocks 1 and the conventional blocks 5 are spliced together in the building process according to the splicing situation that the two conventional blocks 5 are arranged between the two dismantling blocks 1;
during splicing, the upper clamping body 2 of each dismantling block 1 and the lower clamping body 3 of the adjacent dismantling block 1 are buckled and spliced, namely, each dismantling block 1 is longitudinally spliced during splicing, and the upper clamping body 2 and the lower clamping body 3 are spliced with each other to form a seamless lining structure;
when the panel is dismounted, the air pick tool is used for smashing the mosaic body 4, then the conventional block 5 is replaced, then the independent maintenance block which is the same as the lower layer in shape and the upper layer in shape is installed, and the mosaic block is driven into the gap between the lower layer and the upper layer.
The invention adopts the combined splicing type combined brick and is provided with the dismantling block and the mosaic body, thereby effectively solving the problems that the lining of the existing fluidized bed boiler is difficult to construct, cracks are easy to generate at the brick joints, and the maintenance is difficult after the cracks are generated, and having the following advantages:
1. various raw materials are combined to resist acid corrosion, peeling, high strength and abrasion;
2. the combined structure is adopted, the blocks are combined and buckled, the refractory mortar is not needed to fill gaps, the construction is easy, the field is not required to be baked, and the cracks are avoided;
3. the maintenance is convenient, after part of the blocks are damaged, the damaged blocks on the upper part can be dismounted for replacement and then embedded into the mosaic blocks on the lower part as long as the forward blocks on the lower part are dismounted, the integral structure of the boiler is not damaged, the boiler can be put into use after replacement, only 5 days are needed for each maintenance, and the time is greatly saved;
4. the combined boiler has the advantages of long service life, high economic benefit, no air leakage and fire leakage as long as the boiler body is not damaged in a large area due to the adoption of a combined structure, no need of shutdown for maintenance, high boiler utilization rate and obvious economic benefit.

Claims (8)

1. The acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining is characterized by mainly comprising 30-50 parts of compact alumina, 5-10 parts of kyanite, 10-20 parts of flint clay, 5-8 parts of active alpha alumina micropowder, 3-5 parts of zircon powder, 5-10 parts of silicon carbide powder, 3-5 parts of silicon nitride powder, 2-5 parts of pure calcium aluminate cement, 1 part of wear-resistant steel fiber, 0.5-1 part of special additive B and phosphate serving as a bonding additive;
the production process comprises the following steps:
1. designing a combined steel tire mold according to the size of the furnace;
2. adding water into the raw materials, and uniformly stirring the raw materials by using a forced stirrer, wherein the amount of the added water is 12-15% of the amount of the raw materials;
3. pouring the stirred raw materials into a mould, and placing the mould on a vibration table to vibrate to a slurry turning position;
4. putting the mould and the mould into a normal temperature furnace at 40 ℃ for 2 hours for demoulding;
5. naturally drying for 8 hours;
6. sintering in a medium-temperature baking kiln to 900 ℃;
7. taking out and cooling to obtain the finished product.
2. The acid-corrosion-resistant high-strength composite block for the circulating fluidized bed boiler lining according to claim 1, wherein step 3 is performed by brushing oil on the inner side wall and the bottom surface of the mold before pouring the raw material into the mold.
3. The acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining according to claim 1, wherein in the step 6, the temperature of the medium-temperature baking kiln is gradually increased at a speed of 5 ℃/hour, the temperature in the kiln is kept for 8-12 hours after the temperature in the kiln reaches 110 ℃, then the temperature is continuously increased, and the temperature in the kiln is kept for 3 hours after the temperature in the kiln reaches 900 ℃.
4. The acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining is characterized in that the boiler lining is mainly formed by splicing dismantling blocks (1), the dismantling blocks (1) are of a cubic brick structure, an upper clamping body (2) is fixedly connected to one end, facing the inner side of a boiler, of the upper end face of each dismantling block (1), a lower clamping body (3) is fixedly connected to one end, facing the side wall of the boiler, of the lower end face of each dismantling block (1), each dismantling block (1) is buckled up and down to form the boiler lining, and the upper clamping body (2) of each dismantling block (1) is buckled and spliced with the lower clamping body (3) of the adjacent dismantling block (1) during splicing;
demolish piece (1) internal fixation and be connected with platelike mosaic body (4), mosaic body (4) will demolish piece (1) and divide into the three-layer and from last to being upper strata, mosaic body (4), lower floor down in proper order.
5. The acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining according to claim 4, characterized by further comprising a conventional block (5), wherein the external shape of the conventional block (5) is the same as that of the removal block (1), and the conventional block (5) does not contain the insert (4);
the assembling form of the conventional blocks (5) and the dismantling blocks (1) is that two conventional blocks (5) are arranged between the two dismantling blocks (1).
6. The acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining according to claim 4 or 5, wherein the conventional block (5) and the demolition block (1) have a radian when used as a circular arc lining of the lower part of the boiler so as to be attached to the inner wall surface of the boiler.
7. The acid-corrosion-resistant high-strength composite block for a circulating fluidized bed boiler lining according to claim 4, wherein the insert (4) has an inclined plate shape and is high toward the inner side of the boiler.
8. The acid-corrosion-resistant high-strength combined block for the circulating fluidized bed boiler lining according to claim 4, further comprising independent repair blocks and independent mosaic blocks having the same shapes as the upper layer and the lower layer.
CN202010099665.8A 2020-02-18 2020-02-18 Acid-corrosion-resistant high-strength combined block for circulating fluidized bed boiler lining Pending CN111116218A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114315329A (en) * 2022-02-21 2022-04-12 江苏朗耐德耐火材料有限公司 Corundum silicon carbide composite brick for hazardous waste rotary kiln and preparation method thereof

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509420A (en) * 1966-01-26 1968-01-12 Detrick M H Co Refractory inner lining structure for rotary kiln
CN1970500A (en) * 2005-11-25 2007-05-30 首钢总公司 Pouring material for torpedo tank liner repairing
CN101367668A (en) * 2008-09-25 2009-02-18 武汉钢铁(集团)公司 Pouring material for manufacturing pellet ore rotary kiln and manufacturing method thereof
CN101634458A (en) * 2008-07-23 2010-01-27 沈阳铝镁设计研究院 Ventilating flame path brick for anode calcinating furnace
CN102976771A (en) * 2012-11-16 2013-03-20 宜兴天霸非金属材料有限公司 High temperature resistant lightweight heat insulation castables
CN103435361A (en) * 2013-08-19 2013-12-11 濮阳濮耐高温材料(集团)股份有限公司 High-wear-proof high-thermal-shock-resistant fire-proof material and prefabricated furnace mouth part made from same
CN105906351A (en) * 2016-04-19 2016-08-31 王秀福 A wear resistant castable resisting chemical corrosion
CN205607147U (en) * 2016-04-14 2016-09-28 黄卫国 Bottom brick with inserted load bearing structure
CN106995309A (en) * 2017-05-09 2017-08-01 郑州耐都热陶瓷有限公司 Fire resisting liner body crack is squeegeeed material
CN207865446U (en) * 2018-01-22 2018-09-14 宜兴瑞泰耐火材料有限公司 A kind of waste incinerator Si3N4-SiC bricks
CN109336627A (en) * 2018-12-04 2019-02-15 攀枝花钢城集团有限公司 Aluminium melting furnace furnace lining castable and its preparation and application
CN111306569A (en) * 2020-02-26 2020-06-19 宜兴市中环耐火材料有限公司 Super-high energy combined type fire-resistant precast block for garbage incinerator

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509420A (en) * 1966-01-26 1968-01-12 Detrick M H Co Refractory inner lining structure for rotary kiln
CN1970500A (en) * 2005-11-25 2007-05-30 首钢总公司 Pouring material for torpedo tank liner repairing
CN101634458A (en) * 2008-07-23 2010-01-27 沈阳铝镁设计研究院 Ventilating flame path brick for anode calcinating furnace
CN101367668A (en) * 2008-09-25 2009-02-18 武汉钢铁(集团)公司 Pouring material for manufacturing pellet ore rotary kiln and manufacturing method thereof
CN102976771A (en) * 2012-11-16 2013-03-20 宜兴天霸非金属材料有限公司 High temperature resistant lightweight heat insulation castables
CN103435361A (en) * 2013-08-19 2013-12-11 濮阳濮耐高温材料(集团)股份有限公司 High-wear-proof high-thermal-shock-resistant fire-proof material and prefabricated furnace mouth part made from same
CN205607147U (en) * 2016-04-14 2016-09-28 黄卫国 Bottom brick with inserted load bearing structure
CN105906351A (en) * 2016-04-19 2016-08-31 王秀福 A wear resistant castable resisting chemical corrosion
CN106995309A (en) * 2017-05-09 2017-08-01 郑州耐都热陶瓷有限公司 Fire resisting liner body crack is squeegeeed material
CN207865446U (en) * 2018-01-22 2018-09-14 宜兴瑞泰耐火材料有限公司 A kind of waste incinerator Si3N4-SiC bricks
CN109336627A (en) * 2018-12-04 2019-02-15 攀枝花钢城集团有限公司 Aluminium melting furnace furnace lining castable and its preparation and application
CN111306569A (en) * 2020-02-26 2020-06-19 宜兴市中环耐火材料有限公司 Super-high energy combined type fire-resistant precast block for garbage incinerator

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
中国耐火材料行业协会编: "《中国耐火材料工业年鉴》", 31 August 2015 *
杨立山: "添加剂辅助合成硼化物、碳化物、氮化物纳米材料", 《中国优秀博硕士学位论文全文数据库(博士)工程科技Ⅰ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114315329A (en) * 2022-02-21 2022-04-12 江苏朗耐德耐火材料有限公司 Corundum silicon carbide composite brick for hazardous waste rotary kiln and preparation method thereof

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Application publication date: 20200508