CN112142421A - Autoclaved fly ash brick and production process thereof - Google Patents
Autoclaved fly ash brick and production process thereof Download PDFInfo
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- CN112142421A CN112142421A CN202010909620.2A CN202010909620A CN112142421A CN 112142421 A CN112142421 A CN 112142421A CN 202010909620 A CN202010909620 A CN 202010909620A CN 112142421 A CN112142421 A CN 112142421A
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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
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
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Abstract
The invention discloses a fly ash brick for autoclaved curing and a production process thereof, which uses grain slag, increases the proportion of the grain slag and coarse slag, the granulated slag can be used for partially or completely replacing the crushed stones, the compression strength and the breaking strength of the finished product can be effectively increased, the freeze-thaw resistance and the drying shrinkage resistance are improved, by searching related raw material substitutes and searching optimal process control parameters, the method is applied to a production line after laboratory tests, improves the quality of materials, effectively improves the material ratio, reduces the product cost, but also greatly reduces the phenomena of brick falling, brick collapse and the like in the forming process, greatly improves the forming efficiency and the appearance quality of finished products, can adjust the position between two side limiting plates by steam curing equipment, meets the installation of brick plates with different widths, and further, the steam curing trolley can meet the requirements of placing different quantities of green bricks and distinguishing green bricks of different models.
Description
Technical Field
The invention relates to the technical field of fly ash brick processing, in particular to a fly ash brick for autoclaved curing and a production process thereof.
Background
In the building industry, at present, a large amount of solid clay bricks are still used as main building materials, so that not only is a large amount of land resources consumed, but also the environment is greatly damaged by the high-energy-consumption extensive production mode of the clay bricks. As a novel energy-saving material, the fly ash brick has excellent product performance, not only can save resources, but also can improve the functions of buildings.
The conventional autoclaved curing process for the fly ash bricks has high production cost, and the phenomena of brick falling, brick collapse and the like are often generated in the forming procedure. The existing steam curing equipment is usually provided with a plurality of steam pipes to increase the contact between steam and green bricks, but the arrangement of the steam pipes leads to the limitation of the number of green bricks which can be simultaneously steamed in the steam curing equipment, and the steam curing efficiency is not high. When the outside air temperature is too low, the heating efficiency of the cold air is also reduced, resulting in a reduction in the overall steaming effect.
Disclosure of Invention
The invention aims to provide an autoclaved fly ash brick and a production process thereof, and solves the following technical problems: (1) in view of the physicochemical properties of the granulated slag, the granulated slag is used, the proportion of the granulated slag and the coarse slag is increased, crushed stone can be partially or completely replaced by the granulated slag, the compression strength and the bending strength of a finished product can be effectively increased, the freeze-thaw resistance and the drying shrinkage resistance are improved, related raw material substitutes are found and optimal process control parameters are searched, the granulated slag is applied to a production line after laboratory tests, the material quality is improved, the material ratio is effectively improved, the product cost is reduced, the phenomena of brick falling, brick collapse and the like in a forming process are greatly reduced, and the forming efficiency and the appearance quality of the finished product are greatly improved; (2) by the structure, the steam curing equipment can adjust the space between the two side limiting plates to meet the installation of the brick plates with different widths, so that the steam curing trolley can meet the placing of different quantities of green bricks and the distinguishing of green bricks with different models; (3) the external air enters an air inlet cavity through an air inlet pipe, the air sequentially enters a primary filter and a secondary filter into a heat recovery device, the heat recovery device heats the air, the heated air enters a steam generator through the heat recovery device, the steam generator discharges steam into a steam curing chamber through a steam pipe, a rotating motor is started, an output shaft of the rotating motor drives a gear to rotate, the gear is meshed with a gear to drive a connecting shaft rod to rotate, the connecting shaft rod drives a supporting turntable to rotate, the supporting turntable drives a brick plate to rotate through a side limiting plate, the steam in the steam curing chamber enters an air outlet cavity through an air return pipe after the steam curing is finished, the steam recovers the steam heat through the heat recovery device, an exhaust fan exhausts the gas from an exhaust pipe, namely, the autoclaved fly ash brick can be taken out from the steam curing chamber, and the external low-temperature air can be treated through the structure, the green bricks are steamed through the matching of the heat recoverer and the steam generator, and the steaming efficiency is high.
The purpose of the invention can be realized by the following technical scheme:
an autoclaved fly ash brick is prepared from the following raw materials in parts by weight: 49-60 parts of fly ash, 20-30 parts of coarse slag, 10-15 parts of granulated slag, 10-20 parts of broken stone, 8-12 parts of quick lime and 3-10 parts of fly ash;
the autoclaved fly ash brick is prepared by the following steps:
the method comprises the following steps: weighing fly ash, coarse slag, water granulated slag, broken stone, quicklime and fly ash, feeding the raw materials into a powerful mixer for mixing, stirring for 1-1.5min, adding water to enable the water content of the mixed materials to reach 12% -14%, continuing stirring for 2min, after full mixing, feeding the materials into a digestion bin through a belt conveyor and a bucket elevator, and feeding, stirring and discharging for 5-7 min; controlling the water content of the materials to be put in storage to be 12% -14%, and controlling the effective calcium oxide content to be 7 +/-1%;
step two: flexibly adjusting the quantity of the materials in each bin according to the material consumption speed and the digestion time, wherein the material digestion time is 50-150 min;
step three: the materials enter a wheel mill, the rolling time in the wheel mill is 30s, a water pipe spray head is arranged inside the wheel mill, if the materials are partially dry, water is added to enable the water content of the materials to reach 11% -13%, and the formed green bricks are obtained;
step four: taking a brick plate of the steam-curing equipment down from between two side limiting plates, placing a formed brick blank on the brick plate of the steam-curing equipment, installing the brick plate between the two side limiting plates, starting a traction motor, drawing a steam-curing trolley into a steam-curing chamber by the traction motor, enabling external air to enter an air inlet cavity through an air inlet pipe, enabling the air to enter a heat recovery device through a primary filter and a secondary filter in sequence, heating the air by the heat recovery device, enabling the heated air to enter a steam generator through the heat recovery device, discharging steam into the steam-curing chamber through a steam pipe by the steam generator, starting a rotating motor, driving a gear I to rotate by an output shaft of the rotating motor, driving a gear II to rotate by the gear I, driving a connecting shaft rod to rotate, driving a supporting turntable to rotate by the connecting shaft rod, driving the brick plate to rotate by the side limiting plates, and enabling the steam in the steam-curing chamber to enter an air outlet cavity through an, the steam is recovered by the heat recoverer, and the exhaust fan exhausts the gas from the exhaust pipe, so that the autoclaved fly ash brick can be taken out from the steam curing chamber.
Furthermore, the loss on ignition of the fly ash during the batching and stirring is less than 8 percent, and the fineness of the fly ash passing through a 0.08mm square-hole sieve is less than 45 percent; the requirements for quicklime: the effective calcium oxide is more than or equal to 60 percent, the digestion speed is less than or equal to 10min, and the digestion temperature is more than or equal to 60 ℃; the blocky calcined lime entering a factory is crushed by a jaw crusher and then enters a storage bin to be ground to ensure that the particle size is less than 25mm, then the blocky calcined lime and the crushed waste bricks which are also crushed by the jaw crusher enter a ball mill for ball milling according to the weight ratio of 6:1, the ball milling is completed, and the blocky calcined lime is sent into a cementing storage bin for standby application, wherein the fineness of the cementing material is 10-15%, the effective calcium oxide is more than or equal to 50%, the digestion speed is less than or equal to 30min, and the digestion.
Furthermore, the water content of the coarse slag is less than 30%, the ignition loss is less than 25%, and the mass ratio of the granulated slag to the coarse slag is 1: 2.
Furthermore, the mud content of the crushed stone is less than 5 percent, and the water content is required to be less than 3 percent; if the aggregate particles are too large, the aggregate particles are crushed by a high-fine crusher to obtain the aggregate with uniform particle size and particles of more than 5mm of which the content is not more than 5%.
Further, the forming is to press the mixture into a green brick with required specification by a hydraulic brick machine, and the following parameters are controlled according to requirements: and (3) distributing depth: according to different product specifications and different material distribution depths, the material distribution depths and the sizes of green bricks are in a proportional relation, and the theoretical ratio is 1.56, namely the compression degree k of the mixed material for producing the fly ash bricks is approximately equal to 1.56; molding pressure: the forming pressure is controlled to be 120-150 bar, the larger the pressure is, the more compact the green brick is, in the actual production, the forming pressure is adjusted according to the forming difficulty, the initial strength of the green brick is low, the upper limit value is selected when the green brick is easy to damage in the clamping process, and otherwise, the lower limit value is selected; forming speed: the forming speed is directly determined by materials and is divided into prepressing speed and forming speed, the prepressing speed is controlled to be 100-180 mm/s, and the forming speed is controlled to be 10-18 mm/s; extrusion completion delay time: the pressure maintaining time after the molding is finished is the same as the selection basis of the speed of the press, and the range is selected to be below 0.5 s; material distribution speed and material distribution times: the running speed of the material distribution system is intuitively represented as a material distribution period, the length of the period is directly related to the flowability of the material, when the flowability of the material is poor, the material distribution period is prolonged, the material distribution times are increased, or the material distribution speed is slowed down, and the two effects are the same; the material distribution times are selected from 1-9 times.
Further, in the second step, if the digestion time is long or the digestion time is too long due to equipment failure, the bin needs to be loosened in time to prevent the materials from being accumulated; the water content of the discharged materials is controlled to be 11-13 percent.
Further, in the third step, the actual distribution depth is h + Δ h, wherein h is a basic value of the distribution depth and is 1.56 times of the height of the finished brick blank, and Δ h is a dynamically-changed distribution depth correction value, and the change range of the Δ h is-20-30 mm.
Further, the basic value h of the material distribution depth of the fly ash brick with the finished product height of 115mm is set to be 180mm, the basic value h of the material distribution depth of the fly ash brick with the finished product height of 90mm is set to be 140 mm.
Furthermore, the steam curing equipment comprises a steam curing chamber, wherein a traction motor is arranged in the steam curing chamber and used for drawing a steam curing trolley, a supporting turntable is rotatably arranged on the steam curing trolley and provided with two supporting strips, two side sliding plates are longitudinally slidably arranged between the two supporting strips, side limiting plates are longitudinally arranged at the tops of the side sliding plates, a plurality of brick plates are arranged between the two side limiting plates, and the brick plates are longitudinally arranged between the two side limiting plates;
the steam curing chamber is characterized in that an air chamber is arranged on one side of the steam curing chamber, an air inlet cavity and an air outlet cavity are arranged in the air chamber, the air inlet cavity is arranged above the air outlet cavity, an air inlet pipe is installed at one end of the air inlet cavity, a primary filter and a secondary filter are arranged in the air inlet pipe, a heat recovery device is arranged between the air inlet cavity and the air outlet cavity, a steam generator is arranged on one side, away from the primary filter, of the air inlet cavity, a steam pipe is installed on the steam generator, the steam pipe is communicated with the side wall of the steam curing chamber, an exhaust fan is arranged in the air outlet cavity, an exhaust pipe is installed on the exhaust fan, one.
Furthermore, an annular groove is formed in the top of the steam-curing trolley, a rotating motor is arranged in the annular groove, a first gear is sleeved on the end portion of an output shaft of the rotating motor, a connecting shaft rod is longitudinally arranged in the annular groove, a second gear is sleeved on the connecting shaft rod and meshed with the first gear, the second gear is fixed to the bottom of a connecting seat, the connecting seat is fixed to the bottom of a supporting turntable, two guide blocks are mounted on the top of the steam-curing trolley, an annular guide groove is formed in the bottom of the supporting turntable, and the guide blocks are connected with the annular guide groove in a sliding mode.
Further, install the connecting plate between two support bars, the upset cylinder is installed to the connecting plate bottom, upset cylinder output shaft rotor plate, rotate on the rotor plate and install two hexagonal pull rods, the hexagonal pull rod is kept away from rotor plate one end and is rotated and connect the sideslip board, two slide rails are installed at the support bar top, and two slide rails are installed respectively in support bar top both sides, two sliders are installed to the sideslip board bottom, the sideslip board is through two slide rails of two slider sliding connection.
Furthermore, a plurality of mounting grooves are longitudinally formed in the side limiting plate, the mounting grooves are equidistantly formed in the side limiting plate, and the side limiting plate is movably inserted into the mounting grooves.
Further, the steam curing equipment has the following working process:
taking a brick plate of the steam-curing equipment down from between two side limiting plates, placing a formed brick blank on the brick plate of the steam-curing equipment, installing the brick plate between the two side limiting plates, starting a traction motor, drawing a steam-curing trolley into a steam-curing chamber by the traction motor, enabling external air to enter an air inlet cavity through an air inlet pipe, enabling the air to enter a heat recovery device through a primary filter and a secondary filter in sequence, heating the air by the heat recovery device, enabling the heated air to enter a steam generator through the heat recovery device, discharging steam into the steam-curing chamber through a steam pipe by the steam generator, starting a rotating motor, driving a gear I to rotate by an output shaft of the rotating motor, driving a gear II to rotate by the gear I, driving a connecting shaft rod to rotate, driving a supporting turntable to rotate by the connecting shaft rod, driving the brick plate to rotate by the side limiting plates, and enabling the steam in the steam-curing chamber to enter an air outlet cavity through an, the steam is recovered by the heat recoverer, and the exhaust fan exhausts the gas from the exhaust pipe, so that the autoclaved fly ash brick can be taken out from the steam curing chamber.
The invention has the beneficial effects that:
(1) according to the autoclaved fly ash brick and the production process thereof, the granulated slag is used in view of the physicochemical properties of the granulated slag, the proportion of the granulated slag and the coarse slag is increased, the granulated slag can be used for partially or completely replacing broken stones, the compression strength and the bending strength of a finished product can be effectively increased, the freeze-thaw resistance and the drying shrinkage resistance are improved, the related raw material substitutes are found, the optimal process control parameters are searched, the autoclaved fly ash brick is applied to a production line after a laboratory test, the material quality is improved, the material ratio is effectively improved, the product cost is reduced, the phenomena of brick falling, brick collapse and the like in a forming process are greatly reduced, and the forming efficiency and the appearance quality of the finished product are greatly improved;
(2) by opening the turnover cylinder, the turnover cylinder drives the rotating plate to rotate, the rotating plate drives the two hexagonal pull rods to rotate, the two hexagonal pull rods drive the two side sliding plates to move oppositely or reversely, the distance between the two side limiting plates is adjusted, through the structure, the steam curing equipment can adjust the position between the two side limiting plates to meet the installation of the brick plates with different widths, so that the steam curing trolley can meet the placing of green bricks with different quantities and the distinguishing of green bricks with different models, the rotating motor is started, the output shaft of the rotating motor drives the first gear to rotate, the first gear is meshed with the second gear to drive the second gear to rotate, the second gear drives the connecting shaft lever to rotate, the connecting shaft lever drives the supporting turntable to rotate, the supporting turntable drives the brick plates to rotate through the side limiting plates, through the structure, green bricks on the brick plates can be fully contacted with steam in the steam curing chamber, so that the steam curing efficiency is effectively improved;
(3) the external air enters an air inlet cavity through an air inlet pipe, the air sequentially enters a primary filter and a secondary filter into a heat recovery device, the heat recovery device heats the air, the heated air enters a steam generator through the heat recovery device, the steam generator discharges steam into a steam curing chamber through a steam pipe, a rotating motor is started, an output shaft of the rotating motor drives a gear to rotate, the gear is meshed with a gear to drive a connecting shaft rod to rotate, the connecting shaft rod drives a supporting turntable to rotate, the supporting turntable drives a brick plate to rotate through a side limiting plate, the steam in the steam curing chamber enters an air outlet cavity through an air return pipe after the steam curing is finished, the steam recovers the steam heat through the heat recovery device, an exhaust fan exhausts the gas from an exhaust pipe, namely, the autoclaved fly ash brick can be taken out from the steam curing chamber, and the external low-temperature air can be treated through the structure, the green bricks are steamed through the matching of the heat recoverer and the steam generator, and the steaming efficiency is high.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view showing the construction of a steam curing apparatus according to the present invention;
FIG. 2 is an installation view of the support turntable of the present invention;
FIG. 3 is a side view of the side restrictor plate of the present invention;
FIG. 4 is a top view of the support bar of the present invention;
FIG. 5 is a bottom view of FIG. 4 of the present invention;
FIG. 6 is a bottom view of the support turntable of the present invention;
FIG. 7 is an internal structural view of the air cell of the present invention.
In the figure: 1. a steam curing room; 2. a traction motor; 3. steaming the trolley; 4. a support turntable; 5. an annular groove; 6. a rotating electric machine; 7. connecting the shaft lever; 8. a connecting seat; 9. a guide block; 10. an annular guide groove; 11. a supporting strip; 12. a side slide plate; 13. a connecting plate; 14. turning over the air cylinder; 15. a rotating plate; 16. a hexagonal draw bar; 17. a side limiting plate; 18. brick boards; 19. installing a groove; 20. an air chamber; 21. an air inlet cavity; 22. an air outlet cavity; 23. an air inlet pipe; 24. a first stage filter; 25. a secondary filter; 26. a heat recovery device; 27. a steam generator; 28. a steam pipe; 29. an exhaust fan; 30. an exhaust duct; 31. and a return air pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to FIGS. 1-7
Example 1
An autoclaved fly ash brick is prepared from the following raw materials in parts by weight: 49 parts of fly ash, 20 parts of coarse slag, 10 parts of granulated slag, 10 parts of broken stone, 8 parts of quick lime and 3 parts of fly ash;
the autoclaved fly ash brick is prepared by the following steps:
the method comprises the following steps: weighing fly ash, coarse slag, water granulated slag, broken stone, quicklime and fly ash, feeding the raw materials into a powerful mixer for mixing, stirring for 1min, adding water to enable the water content of the mixed materials to reach 12%, continuing stirring for 2min, fully mixing, feeding to a digestion bin through a belt conveyor and a bucket elevator, and feeding, stirring and discharging for 5 min; controlling the water content of the material to be stored to be 12 percent and the effective calcium oxide content to be 6 percent;
step two: flexibly adjusting the quantity of the materials in each bin according to the material consumption speed and the digestion time, wherein the material digestion time is 50 min;
step three: the materials enter a wheel mill, the rolling time in the wheel mill is 30s, a water pipe spray head is arranged inside the wheel mill, if the materials are partially dry, water is added to enable the water content of the materials to reach 11%, and a formed brick blank is obtained;
step four: taking a brick plate 18 of the steaming and pressing equipment down from between two side limiting plates 17, placing the formed brick blank on the brick plate 18 of the steaming and pressing equipment, installing the brick plate 18 between the two side limiting plates 17, starting an overturning cylinder 14, the overturning cylinder 14 drives a rotating plate 15 to rotate, the rotating plate 15 drives two hexagonal pull rods 16 to rotate, the two hexagonal pull rods 16 drive two side sliding plates 12 to move oppositely or reversely, adjusting the distance between the two side limiting plates 17, starting a traction motor 2, the traction motor 2 pulls a steaming trolley 3 into a steaming and curing chamber 1, externally connected air enters an air inlet cavity 21 through an air inlet pipe 23, the air enters a heat recovery device 26 through a primary filter 24 and a secondary filter 25 in sequence, the heated air enters a steam generator 27 through the heat recovery device 26, the steam generator 27 discharges steam into the steaming and curing chamber 1 through a steam pipe 28, the rotary motor 6 is started, an output shaft of the rotary motor 6 drives a first gear to rotate, the first gear is meshed with a second gear to drive a second gear to rotate, the second gear drives a connecting shaft rod 7 to rotate, the connecting shaft rod 7 drives a supporting turntable 4 to rotate, the supporting turntable 4 drives a brick plate 18 to rotate through a side limiting plate 17, steam in the steam curing chamber 1 enters an air outlet cavity 22 through an air return pipe 31 after steam curing is finished, the steam recovers steam heat through a heat recoverer 26, an exhaust fan 29 exhausts the gas from an exhaust pipe 30, and then the autoclaved fly ash brick can be taken out from the steam curing chamber 1.
Specifically, the loss on ignition of the fly ash during burdening and stirring is less than 8 percent, and the fineness of the fly ash passing through a 0.08mm square-hole sieve is less than 45 percent; the requirements for quicklime: the effective calcium oxide is more than or equal to 60 percent, the digestion speed is less than or equal to 10min, and the digestion temperature is more than or equal to 60 ℃; the blocky calcined lime entering a factory is crushed by a jaw crusher and then enters a storage bin to be ground to ensure that the particle size is less than 25mm, then the blocky calcined lime and the crushed waste bricks which are also crushed by the jaw crusher enter a ball mill for ball milling according to the weight ratio of 6:1, the crushed waste bricks are sent into a cementing storage bin for standby after the ball milling is finished, the fineness of a cementing material is required to be 10 percent, the effective calcium oxide is more than or equal to 50 percent, the digestion speed is less than or equal to 30min, and the. The water content of the coarse slag is less than 30%, the ignition loss is less than 25%, and the mass ratio of the granulated slag to the coarse slag is 1: 2. The mud content of the broken stone is less than 5 percent, and the water content is less than 3 percent; if the aggregate particles are too large, the aggregate particles are crushed by a high-fine crusher to obtain the aggregate with uniform particle size and particles of more than 5mm of which the content is not more than 5%. The forming is to press the mixture into a green brick with required specification by a hydraulic brick machine, and the following parameters are controlled according to requirements: and (3) distributing depth: according to different product specifications and different material distribution depths, the material distribution depths and the sizes of green bricks are in a proportional relation, and the theoretical ratio is 1.56, namely the compression degree k of the mixed material for producing the fly ash bricks is approximately equal to 1.56; molding pressure: the forming pressure is controlled to be 120bar, the larger the pressure is, the more compact the green brick is, in the actual production, the forming pressure is adjusted according to the forming difficulty, the initial strength of the green brick is low, the upper limit value is selected when the green brick is easy to damage in the clamping process, and otherwise, the lower limit value is selected; forming speed: the forming speed is directly determined by materials and is divided into prepressing speed and forming speed, the prepressing speed is controlled to be 100mm/s, and the forming speed is controlled to be 10 mm/s; extrusion completion delay time: the pressure maintaining time after the molding is finished is the same as the selection basis of the speed of the press, and the range is selected to be below 0.5 s; material distribution speed and material distribution times: the running speed of the material distribution system is intuitively represented as a material distribution period, the length of the period is directly related to the flowability of the material, when the flowability of the material is poor, the material distribution period is prolonged, the material distribution times are increased, or the material distribution speed is slowed down, and the two effects are the same; the material distribution times are selected to be 1 time. If the digestion time is long or the digestion time is too long due to equipment failure, the bin needs to be loosened in time to prevent the materials from being accumulated; the water content of the discharged materials is controlled to be 11 percent. In the third step of forming, the actual distribution depth is h plus delta h, wherein h is a basic value of the distribution depth and is 1.56 times of the height of the finished brick blank, and delta h is a dynamically changed distribution depth correction value, and the change range of the delta h is-20 mm. The basic value h of the material distribution depth of the fly ash brick with the finished product height of 115mm is set to be 180mm, the basic value h of the material distribution depth of the fly ash brick with the finished product height of 90mm is set to be 140 mm.
Example 2
An autoclaved fly ash brick is prepared from the following raw materials in parts by weight: 60 parts of fly ash, 30 parts of coarse slag, 15 parts of granulated slag, 20 parts of broken stone, 12 parts of quick lime and 10 parts of fly ash;
the autoclaved fly ash brick is prepared by the following steps:
the method comprises the following steps: weighing fly ash, coarse slag, water granulated slag, broken stone, quicklime and fly ash, feeding the raw materials into a powerful mixer for mixing, stirring for 1.5min, adding water to enable the water content of the mixed materials to reach 14%, continuing stirring for 2min, fully mixing, feeding to a digestion bin through a belt conveyor and a bucket elevator, and feeding, stirring and blanking for 7 min; controlling the water content of the material to be put in storage to be 14 percent and the content of effective calcium oxide to be 8 percent;
step two: flexibly adjusting the quantity of the materials in each bin according to the material consumption speed and the digestion time, wherein the material digestion time is 150 min;
step three: the materials enter a wheel mill, the rolling time in the wheel mill is 30s, a water pipe spray head is arranged inside the wheel mill, if the materials are partially dry, water is added to enable the water content of the materials to reach 13%, and a formed brick blank is obtained;
step four: step four is the same as in example 1.
Specifically, the loss on ignition of the fly ash during burdening and stirring is less than 8 percent, and the fineness of the fly ash passing through a 0.08mm square-hole sieve is less than 45 percent; the requirements for quicklime: the effective calcium oxide is more than or equal to 60 percent, the digestion speed is less than or equal to 10min, and the digestion temperature is more than or equal to 60 ℃; the blocky calcined lime entering a factory is crushed by a jaw crusher and then enters a storage bin to be ground to ensure that the particle size is less than 25mm, then the blocky calcined lime and the crushed waste bricks which are also crushed by the jaw crusher enter a ball mill for ball milling according to the weight ratio of 6:1, the crushed waste bricks are sent into a cementing storage bin for standby after the ball milling is finished, the fineness of a cementing material is required to be 15 percent, the effective calcium oxide is more than or equal to 50 percent, the digestion speed is less than or equal to 30min, and the. The water content of the coarse slag is less than 30%, the ignition loss is less than 25%, and the mass ratio of the granulated slag to the coarse slag is 1: 2. The mud content of the broken stone is less than 5 percent, and the water content is less than 3 percent; if the aggregate particles are too large, the aggregate particles are crushed by a high-fine crusher to obtain the aggregate with uniform particle size and particles of more than 5mm of which the content is not more than 5%. The forming is to press the mixture into a green brick with required specification by a hydraulic brick machine, and the following parameters are controlled according to requirements: and (3) distributing depth: according to different product specifications and different material distribution depths, the material distribution depths and the sizes of green bricks are in a proportional relation, and the theoretical ratio is 1.56, namely the compression degree k of the mixed material for producing the fly ash bricks is approximately equal to 1.56; molding pressure: the forming pressure is controlled to be 150bar, the larger the pressure is, the more compact the green brick is, in the actual production, the forming pressure is adjusted according to the forming difficulty, the initial strength of the green brick is low, the upper limit value is selected when the green brick is easy to damage in the clamping process, and otherwise, the lower limit value is selected; forming speed: the forming speed is directly determined by materials and is divided into prepressing speed and forming speed, the prepressing speed is controlled to be 180mm/s, and the forming speed is controlled to be 18 mm/s; extrusion completion delay time: the pressure maintaining time after the molding is finished is the same as the selection basis of the speed of the press, and the range is selected to be below 0.5 s; material distribution speed and material distribution times: the running speed of the material distribution system is intuitively represented as a material distribution period, the length of the period is directly related to the flowability of the material, when the flowability of the material is poor, the material distribution period is prolonged, the material distribution times are increased, or the material distribution speed is slowed down, and the two effects are the same; the material distribution times are 9 times. In the second step, if the digestion time is long or the digestion time is too long due to equipment failure, the material needs to be loosened in time to prevent the material from being accumulated; the water content of the discharged materials is controlled to be 13 percent. In the third step, the actual distribution depth is h + delta h, wherein h is a basic value of the distribution depth and is 1.56 times of the height of the finished green brick, and delta h is a dynamically-changed distribution depth correction value, and the change range of the distribution depth correction value is 30 mm. The basic value h of the material distribution depth of the fly ash brick with the finished product height of 115mm is set to be 180mm, the basic value h of the material distribution depth of the fly ash brick with the finished product height of 90mm is set to be 140 mm.
The steam-curing equipment comprises a steam-curing chamber 1, a traction motor 2 is arranged in the steam-curing chamber 1, the traction motor 2 is used for drawing a steam-curing trolley 3, a supporting turntable 4 is rotatably arranged on the steam-curing trolley 3, two supporting strips 11 are arranged on the supporting turntable 4, two side sliding plates 12 are longitudinally slidably arranged between the two supporting strips 11, side limiting plates 17 are longitudinally arranged at the tops of the side sliding plates 12, a plurality of brick plates 18 are arranged between the two side limiting plates 17, and the brick plates 18 are longitudinally arranged between the two side limiting plates 17;
steam curing room 1 one side is provided with air chamber 20, be provided with air intake cavity 21 in the air chamber 20, go out the air cavity 22, air intake cavity 21 sets up in going out the air cavity 22 top, air intake pipe 23 is installed to air intake cavity 21 one end, be provided with primary filter 24 in the air intake pipe 23, secondary filter 25, be provided with heat recovery device 26 between air intake cavity 21 and the air cavity 22, air intake cavity 21 inner chamber is kept away from primary filter 24 one side and is provided with steam generator 27, the last steam pipe 28 of installing of steam generator 27, steam pipe 28 intercommunication steam curing room 1 lateral wall, it is provided with exhaust fan 29 in the air cavity 22, install exhaust pipe 30 on the exhaust fan 29, air cavity 22 is kept away from exhaust pipe 30 one end and is installed return air.
Concretely, circular groove 5 has been seted up at 3 tops of steamed foster dolly, be provided with rotating electrical machines 6 in the circular groove 5, the cover of 6 output shaft ends of rotating electrical machines is equipped with gear one, vertically be provided with connecting shaft rod 7 in the circular groove 5, the cover is equipped with gear two on the connecting shaft rod 7, gear one and two intermeshing of gear, gear two is fixed in the connecting seat 8 bottom, connecting seat 8 is fixed in and supports 4 bottoms of carousel, steam foster dolly 3 tops and install two guide blocks 9, support 4 bottoms of carousel and seted up annular guide way 10, guide block 9 sliding connection annular guide way 10.
Install connecting plate 13 between two support bars 11, upset cylinder 14 is installed to connecting plate 13 bottom, upset cylinder 14 output shaft connects rotor plate 15, rotate on the rotor plate 15 and install two hexagonal pull rods 16, hexagonal pull rod 16 keeps away from rotor plate 15 one end and rotates and connect side slide 12, two slide rails are installed at 11 tops of support bar, two slide rails are installed respectively in 11 top both sides of support bar, two sliders are installed to 12 bottoms of side slide, side slide 12 is through two slide rails of two slider sliding connection.
A plurality of mounting grooves 19 are longitudinally formed in the side limiting plate 17, the mounting grooves 19 are equidistantly formed in the side limiting plate 17, and the side limiting plate 17 is movably inserted into the mounting grooves 19.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (5)
1. The autoclaved fly ash brick is characterized by being prepared from the following raw materials in parts by weight: 49-60 parts of fly ash, 20-30 parts of coarse slag, 10-15 parts of granulated slag, 10-20 parts of broken stone, 8-12 parts of quick lime and 3-10 parts of fly ash;
the autoclaved fly ash brick is prepared by the following steps:
the method comprises the following steps: weighing fly ash, coarse slag, water granulated slag, broken stone, quick lime and fly ash, feeding the raw materials into a powerful mixer for mixing, stirring for 1-1.5min, adding water to enable the water content of the mixed materials to reach 12% -14%, continuing stirring for 2min, fully mixing to obtain a mixture, and conveying the mixture to a storage bin through a belt conveyor and a bucket elevator in sequence;
step two: adding the mixture in the storage bin into an edge runner mill for edge runner milling for 30s to obtain a molded green brick;
step three: taking a brick plate of the steam-curing equipment down from between two side limiting plates, placing a formed brick blank on the brick plate of the steam-curing equipment, installing the brick plate between the two side limiting plates, starting a traction motor, drawing a steam-curing trolley into a steam-curing chamber by the traction motor, enabling external air to enter an air inlet cavity through an air inlet pipe, enabling the air to enter a heat recovery device through a primary filter and a secondary filter in sequence, heating the air by the heat recovery device, enabling the heated air to enter a steam generator through the heat recovery device, discharging steam into the steam-curing chamber through a steam pipe by the steam generator, starting a rotating motor, driving a gear I to rotate by an output shaft of the rotating motor, driving a gear II to rotate by the gear I, driving a connecting shaft rod to rotate, driving a supporting turntable to rotate by the connecting shaft rod, driving the brick plate to rotate by the side limiting plates, and enabling the steam in the steam-curing chamber to enter an air outlet cavity through an, the steam is recovered from the steam heat through the heat recoverer, the exhaust fan exhausts the gas from the exhaust pipe, and the autoclaved fly ash brick is taken out from the steam curing chamber.
2. The autoclaved fly ash brick production process according to claim 1, characterized by comprising the steps of:
the method comprises the following steps: weighing fly ash, coarse slag, water granulated slag, broken stone, quick lime and fly ash, feeding the raw materials into a powerful mixer for mixing, stirring for 1-1.5min, adding water to enable the water content of the mixed materials to reach 12% -14%, continuing stirring for 2min, fully mixing to obtain a mixture, and conveying the mixture to a storage bin through a belt conveyor and a bucket elevator in sequence;
step two: adding the mixture in the storage bin into an edge runner mill for edge runner milling for 30s to obtain a molded green brick;
step three: taking a brick plate of the steam-curing equipment down from between two side limiting plates, placing a formed brick blank on the brick plate of the steam-curing equipment, installing the brick plate between the two side limiting plates, starting a traction motor, drawing a steam-curing trolley into a steam-curing chamber by the traction motor, enabling external air to enter an air inlet cavity through an air inlet pipe, enabling the air to enter a heat recovery device through a primary filter and a secondary filter in sequence, heating the air by the heat recovery device, enabling the heated air to enter a steam generator through the heat recovery device, discharging steam into the steam-curing chamber through a steam pipe by the steam generator, starting a rotating motor, driving a gear I to rotate by an output shaft of the rotating motor, driving a gear II to rotate by the gear I, driving a connecting shaft rod to rotate, driving a supporting turntable to rotate by the connecting shaft rod, driving the brick plate to rotate by the side limiting plates, and enabling the steam in the steam-curing chamber to enter an air outlet cavity through an, the steam is recovered from the steam heat through the heat recoverer, the exhaust fan exhausts the gas from the exhaust pipe, and the autoclaved fly ash brick is taken out from the steam curing chamber.
3. The autoclaved fly ash brick production process as claimed in claim 2, wherein the content of the available calcium oxide of the quicklime is not less than 60%, the slaking speed of the quicklime is not more than 10min, and the slaking temperature of the quicklime is not less than 60 ℃.
4. The autoclaved fly ash brick production process as claimed in claim 2, wherein the moisture content of the coarse slag is less than 30%, and the loss on ignition of the coarse slag is less than 25%.
5. The autoclaved fly ash brick production process according to claim 2, wherein the content of broken stone sludge is less than 5%, and the water content of broken stone sludge is less than 3%.
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| CN202010909620.2A CN112142421A (en) | 2020-09-02 | 2020-09-02 | Autoclaved fly ash brick and production process thereof |
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| CN202010909620.2A CN112142421A (en) | 2020-09-02 | 2020-09-02 | Autoclaved fly ash brick and production process thereof |
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| WO2011113235A1 (en) * | 2010-03-19 | 2011-09-22 | 中国京冶工程技术有限公司 | Autoclaved light-weight concrete combined wall for sound insulation |
| CN104876523A (en) * | 2015-05-22 | 2015-09-02 | 太原钢铁(集团)有限公司 | Autoclaved flyash-lime brick and preparation method thereof |
| CN106278078A (en) * | 2016-08-22 | 2017-01-04 | 袁正秋 | A kind of flyash blue bricks modelled after an antique |
| CN205905176U (en) * | 2016-08-10 | 2017-01-25 | 桃江县众泰新型建材有限责任公司 | A dual curing means for autoclaved sand -lime brick |
| WO2017175240A1 (en) * | 2016-04-05 | 2017-10-12 | Mehmood Pracha | Autoclaved fly ash bricks and method of manufacturing the same |
| CN107511916A (en) * | 2017-09-29 | 2017-12-26 | 天门黄滩码头新型建材有限公司 | A kind of Dinas brickes steam-pressure maintaining device |
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2020
- 2020-09-02 CN CN202010909620.2A patent/CN112142421A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011113235A1 (en) * | 2010-03-19 | 2011-09-22 | 中国京冶工程技术有限公司 | Autoclaved light-weight concrete combined wall for sound insulation |
| CN104876523A (en) * | 2015-05-22 | 2015-09-02 | 太原钢铁(集团)有限公司 | Autoclaved flyash-lime brick and preparation method thereof |
| WO2017175240A1 (en) * | 2016-04-05 | 2017-10-12 | Mehmood Pracha | Autoclaved fly ash bricks and method of manufacturing the same |
| CN205905176U (en) * | 2016-08-10 | 2017-01-25 | 桃江县众泰新型建材有限责任公司 | A dual curing means for autoclaved sand -lime brick |
| CN106278078A (en) * | 2016-08-22 | 2017-01-04 | 袁正秋 | A kind of flyash blue bricks modelled after an antique |
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Application publication date: 20201229 |