CN113387367B - Method for preparing kaolin by resource utilization of residue soil of urban building engineering - Google Patents
Method for preparing kaolin by resource utilization of residue soil of urban building engineering Download PDFInfo
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- CN113387367B CN113387367B CN202110723596.8A CN202110723596A CN113387367B CN 113387367 B CN113387367 B CN 113387367B CN 202110723596 A CN202110723596 A CN 202110723596A CN 113387367 B CN113387367 B CN 113387367B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
- F27B7/18—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being movable within the drum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/2016—Arrangements of preheating devices for the charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/32—Arrangement of devices for charging
- F27B7/3205—Charging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/38—Arrangements of cooling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/32—Arrangement of devices for charging
- F27B7/3205—Charging
- F27B2007/3211—Charging at the open end of the drum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- General Engineering & Computer Science (AREA)
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- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
According to the method for preparing kaolin by resource utilization of the residue soil of the urban building engineering, when the kaolin is calcined, the roasting roller is internally provided with the material bearing groove, the material vibration device and the aluminum balls, so that the kaolin can have triple effects of sprinkling, vibration and collision while rotating along with the roller II, the kaolin can be uniformly calcined without local overburning, and the calcining efficiency is increased.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment, and particularly relates to a method for preparing kaolin by recycling waste soil in urban building engineering.
Background
Along with the acceleration of the urbanization process in China, more and more building projects are gradually developed, and along with the more and more project dregs needing to be processed, the existing process for the project dregs is used for landfill filling, and for some project dregs, such as Fujian Longyan, Cantonese Guangdong and other areas, because of abundant kaolin resources, most of the excavated project dregs are kaolinite, and for the process for the dregs, if the engineering dregs are used for landfill filling in a landfill, the resources are greatly wasted, and the dregs are urgently needed to be capable of preparing kaolin with high enough quality. The main mineral component of the kaolin is kaolinite, and the crystal chemical formula of the kaolinite is 2SiO 2 ·Al 2 O 3 ·2H 2 And O, removing organic matters through a calcination process, and reconstructing crystal lattices. In the prior art, as in patent document 1, a new process for roasting kaolin is disclosed, in which high-temperature flue gas generated by a fluidized bed furnace is used for roasting kaolin, so that the phenomenon of overburning kaolin caused by overhigh temperature in a traditional kiln due to direct oil injection or pulverized coal injection combustion in the kiln is avoided, and a reverse flow mode of materials and flue gas is adopted, so that heat exchange is perfect, and heat efficiency is high, but in the roasting process, because the materials rotate in a rotary kiln 10, the materials are all positioned at the bottom of the rotary kiln, and the contact between the flue gas and the materials is not complete, the problems that part of the materials are heated too fast, part of the materials are heated too slow, heating is not uniform, and heating time is too much exist, and the heating time is nonadjustable and has high passivity; also, as shown in patent document 2, there is disclosed a method for using a rotary kiln for roasting and activating kaolin, in which aluminum balls are placed in a barrel assembly 4 of the rotary kiln for roasting and activating, the aluminum balls are driven by the rotation of the barrel assembly 4 to collide with each other in the barrel, and collide with flue gas introduced into the barrelSo as to produce kaolin finished product particles with enough fineness, but the collision of the aluminum balls in the cylinder is completely irregular, and the collided aluminum balls can damage the inside of the cylinder, accelerate the aging of equipment and increase the maintenance cost of the equipment; as patent document 3, there is disclosed a silica sand dresser in which a lining 5 is provided in an outer rotary body 4, and the lining 5 has an uneven shape such as ribs so that sand in the rotary body can be ground, but in this grinding method, the lining is fixed and cannot dynamically adjust the shape of the lining 5 in accordance with the rotation speed of the rotary body, and the ribs function to grind the sand in the outer rotary body.
[ patent document 1] CN 105975A;
[ patent document 2] CN 108088240B;
[ patent document 3] CN 2055754U.
In summary, in the prior art, in the method for preparing kaolin by resource utilization of building engineering residue soil, although high-temperature gas is used for reversely flushing kaolin in the baking process of kaolin, when the kaolin is located in a revolving body, the kaolin is not distributed in the whole revolving body along with the rotation of the revolving body and is only distributed at the bottom of the revolving body, so that the kaolin is not fully contacted with the high-temperature gas and is unevenly heated, so that a partial kaolin overburning phenomenon is caused, and if aluminum balls are arranged in the revolving drum, the aluminum balls strike the inner wall of the revolving drum due to an uncertain movement mode of the aluminum balls, so that the inner wall of the drum is damaged, noise is greatly increased, and unnecessary noise pollution is caused, therefore, the invention provides a method which can fully contact the kaolin with hot air in the baking process and can adjust the stirring speed according to the rotating speed of the drum, and the method for preparing the kaolin by recycling the residue soil of the urban building engineering, which has the aluminum balls and cannot damage the inner wall of the cylinder body.
Disclosure of Invention
In order to overcome the defects of the existing kaolin preparation method, the invention provides a technical scheme, and the method for preparing kaolin by recycling slag soil in urban building engineering comprises the following steps:
s1, crushing:
kaolin ore enters a first crushing device from a bin through a hopper to be crushed, and at least 90% of coarse materials with the particle size of less than 30mm are formed; then pouring the mixture into a second crushing device through a conveyor belt for dry fine crushing to form fine materials with the particle size of at least 90 percent smaller than 1 mm;
s2, roasting:
s21, preheating: igniting the fuel to enable hot air to enter the roasting roller from the air outlet pipe, controlling the temperature of the hot air at 110 ℃ and preheating for a period of time, and then carrying out the next step;
s22, feeding: conveying the fine materials into a roasting roller by a screw conveyer;
s23, low-temperature dehumidification stage: keeping the air temperature at 110 ℃ and keeping the low rotating speed of the roasting roller at 0.3-0.8 r/min, wherein a material vibrating device in the roasting roller can disperse kaolin mineral aggregates, a material bearing groove in the barrel of the roasting roller can carry the kaolin mineral aggregates to a high position and then sprinkle the kaolin mineral aggregates, and the contact area between hot air and the mineral aggregates is increased, so that the low-temperature dehumidification time can be reduced, and the next step is carried out after a period of time;
s24, high-temperature calcination stage: the air temperature is raised to 950-;
s3, cooling and charging:
the kaolin calcined by the roasting roller flows out of the end part of the roller, enters a receiving hopper and finally flows into a packaging machine for packaging;
preferably, the system used for firing in step S2 is as follows: the device comprises a roasting roller, a screw conveyor, an air outlet pipe, fuel, an air mixing chamber, a receiving hopper and a cooler, wherein the screw conveyor is connected to the left end of the roasting roller and conveys kaolin mineral aggregate into the roasting roller, hot air after the fuel is combusted enters the air mixing chamber and then is introduced into the right end of the roasting roller through the air outlet pipe, the receiving hopper receives the calcined kaolin from the tail end of the roasting roller and then enters the cooler for cooling so as to carry out the subsequent packaging process flow of the kaolin.
Preferably, the axis of the roasting drum is inclined at an angle to the horizontal, the angle to the horizontal being 2-5 degrees.
Preferably, roasting drum includes the barrel, be provided with a plurality of protruding muscle of limit material in the barrel, the protruding muscle of limit material extends along the axis direction of barrel and distributes, form between two spacing protruding muscle and hold the material recess, hold and be provided with material vibrating device in the material recess, material vibrating device upper surface is less than spacing protruding muscle upper surface, thereby make the material when rotating along with the barrel, can stop in holding the material recess, just downwards the raise and spill the cylinder bottom because of gravity influence when rotating higher position along with the barrel, and the hot-air that lets in the cylinder this moment can be very comprehensive, even contacts with the kaolin granule, reach quick, the purpose of even heating.
Preferably, the material vibrating device is including setting up in the kicking flexible board of barrel inner wall, the kicking flexible board is formed by the assembly of a plurality of compoboard units, every compoboard unit is all including accepting board one, accept board two, balance spring and aluminium ball two, the centre of accepting board one rotates through articulated seat and sets up in the barrel inner wall, the centre of accepting board two rotates through articulated seat two and sets up in the barrel inner wall, the left end of accepting board one is the concave hollow cover structure of establishing, the right-hand member is left ball cambered surface structure, the left end of accepting board two is right ball cambered surface structure, the right-hand member is the flange structure, aluminium ball two sets up in the spherical space who forms by left ball cambered surface structure and right ball cambered surface structure, and balance spring one end is fixed in the barrel inner wall, the other end is fixed in aluminium ball two, the assembly of each compoboard unit is established the hollow cover structure through flange structure and concave and is accomplished.
Preferably, when the material lifting flexible plate is positioned at the lowest end of the roasting roller, the gravity of the second aluminum balls is balanced with the balance spring, so that the material lifting flexible plate is positioned in a horizontal initial state.
Preferably, the hinge seats are each located at the midpoint of the bearing plate.
Preferably, the assembly structure of the convex plate structure and the concave hollow sleeve structure can enable a certain rotational degree of freedom between two groups of plywood units, so that the adjacent plywood units can be linked.
Preferably, still include aluminium ball one, aluminium ball one can only roll in the aluminium ball spacing collar, and the aluminium ball spacing collar is fixed to be set up in the protruding muscle internal surface of material limit, and the aluminium ball spacing collar distributes along the axis direction of barrel has a plurality ofly.
Preferably, the first pulverizing device is a crusher and the second pulverizing device is a ball mill in step S1.
Preferably, the fuel is natural gas or coal.
Preferably, be provided with the ejection of compact structure of valve switch control on roasting cylinder right side, open when needs the ejection of compact for the kaolin material can get into and connect in the hopper.
Preferably, the left end of the first bearing plate and the right end of the second bearing plate are connected through an elastic sleeve, so that the first bearing plate and the second bearing plate have a certain degree of freedom of rotation.
Preferably, the first bearing plate and the second bearing plate are connected by a ball joint, the second aluminum ball is fixedly arranged on the right side of the first bearing plate, and the left side of the second bearing plate is provided with a socket structure matched with the first aluminum ball.
Preferably, in order to control the fluctuation degree of the material raising flexible plate manually, a driving oil cylinder is arranged at one end, far away from the second aluminum ball, of the bearing plate I and the bearing plate II, and the driving oil cylinder is connected between the barrel and the bearing plate, so that the purpose of controlling the fluctuation degree and the frequency of the material raising flexible plate can be achieved by controlling the expansion and contraction of the driving oil cylinder.
The invention has the beneficial effects that:
1) the method for preparing the kaolin by recycling the residue soil of the urban building engineering solves the problem of waste of the engineering residue soil rich in kaolinite, and ensures that hot air can be fully contacted with the kaolin when the kaolin is roasted at high temperature, and the temperature of each part of the kaolin is raised the same, so that the kaolin can be uniformly heated, the over-burning of the part of the kaolin is avoided, and the corresponding convex strip structure is arranged in the drum, so that the kaolin can reach the upper part of the drum when the drum rotates, and the kaolin can be fully distributed in the whole space of the drum and is fully contacted with high-temperature gas;
2) furthermore, a material vibrating device is arranged in the winding drum and is positioned on the inner wall of the winding drum, and the kaolin on the inner wall can be vibrated, dispersed and even lifted along with the rotation of the winding drum, so that the aim of enabling the kaolin to be further contacted with hot air is fulfilled, the lifting force of the stirring device for lifting the kaolin is in direct proportion to the rotating speed of the winding drum, the kaolin can be lifted higher when the winding drum rotates faster, the adjustment of the contact area between the kaolin and the hot air can be controlled by controlling the rotating speed of the winding drum, and the kaolin roasting time can be adjusted by controlling the rotating speed of the winding drum;
3) furthermore, the aluminum balls are arranged in the winding drum, so that the corresponding temperature rise can be carried out when the aluminum balls are heated by hot air, the heat is transferred into kaolin when the aluminum balls are in contact with the kaolin, the purpose of heating the kaolin can be further improved, the heating of the kaolin is uniform, and the aluminum balls are limited to the inner wall of the winding drum to roll through the guide rail;
4) the material vibrating device arranged in the winding drum comprises a material lifting flexible plate, the material lifting flexible plate is formed by combining a plurality of combined plate units, the formed structure is formed by overlapping a plurality of structures similar to a 'seesaw', the material lifting flexible plate can form wavy fluctuation motion along with the rotation of a roller, and the fluctuation degree of the material lifting flexible plate is in direct proportion to the rotation speed of the winding drum due to the aluminum balls arranged in the material lifting flexible plate, so that kaolin particles on the material lifting flexible plate can be more dispersed, and the kaolin particles can be lifted to the upper space in the winding drum under certain conditions and are heated and calcined by hot air;
5) the two bearing plates are innovatively connected in a rotating mode through the aluminum ball structure, the connecting structure does not need to be additionally provided with a rotating shaft structure, the combined plate units are linked through the concave hollow sleeve structure matched with the convex plate structure, a certain degree of rotational freedom can be realized between the two combined plate units through the linkage structure, the complexity of equipment is not increased, and the combined plate units act in a coordinated mode;
6) in the method for preparing kaolin, when the kaolin is calcined, three structural modes of a material bearing groove, an aluminum ball structure and a material raising flexible plate structure in a roller are combined, so that kaolin particles can be uniformly contacted with high-temperature air during calcination, the kaolin particles can be uniformly dispersed, the particle size of the kaolin particles can be smaller due to the impact of the aluminum balls, and a kaolin finished product with higher performance is prepared.
7) The material lifting flexible plate in the material vibrating device is additionally provided with another set of driving oil cylinder structure capable of controlling the fluctuation degree of the material lifting flexible plate besides controlling the fluctuation degree of the material lifting flexible plate by changing the rotating speed, the fluctuation degree and the strength of the material lifting flexible plate can be obviously enhanced by the directly-driven oil cylinder structure, the kaolin material in the material bearing groove at the bottom of the roller can be lifted into the barrel, meanwhile, the kaolin particle material layer can be uniformly and flatly paved in the material bearing groove by the action of the material lifting flexible plate, so that the material distribution is uniform, the effect is better when the kaolin is calcined, and the quality of the formed kaolin finished product is better.
Drawings
FIG. 1 is a schematic structural diagram of a kaolin roasting process of the present invention;
FIG. 2 is a view A-A of FIG. 1;
fig. 3 is a view B-B of fig. 2.
Description of the reference symbols
1. A screw conveyor; 2. roasting the roller; 3. kaolin mineral aggregate; 4. an air outlet pipe; 5. a fuel; 6. a wind mixing chamber; 7. a receiving hopper; 8. a cooler; 9. a barrel; 10. limiting convex ribs; 11. a material bearing groove; 12. a material vibration device; 13. an aluminum ball limiting ring; 14. aluminum balls I; 15. raising the material flexible plate; 16. a second aluminum ball; 17. a balance spring; 18. a combination board unit; 19. a first bearing plate; 20. a second bearing plate; 21. a first hinge seat; 22. a second hinge seat; 23. a left spherical cambered surface structure; 24. a right spherical cambered surface structure; 25. a hollow sleeve structure is concavely arranged; 26. the convex plate structure.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention relates to a method for preparing kaolin by resource utilization of residue soil of urban building engineering, which comprises the following steps:
s1, crushing:
kaolin ore enters a first crushing device from a bin through a hopper to be crushed, and at least 90% of coarse materials with the particle size of less than 30mm are formed; then pouring the mixture into a second crushing device through a conveyor belt for dry fine crushing to form fine materials with the particle size of at least 90 percent smaller than 1 mm;
s2, roasting:
s21, preheating: igniting the fuel, so that hot air enters the roasting roller 2 (rotary kiln) from the air outlet pipe 4, controlling the temperature of the hot air at 110 ℃ for preheating for a period of time, such as 5min, and then carrying out the next step;
s22, feeding: conveying the fine materials into a roasting roller by a screw conveyer;
s23, low-temperature dehumidification stage: keeping the air temperature at 110 ℃ and controlling the low rotating speed of the roasting roller to be 0.3-0.8 r/min, wherein the material vibrating device in the roller can disperse the kaolin mineral aggregate, the material bearing groove 11 in the roller can take the kaolin mineral aggregate into a high position and then sprinkle the kaolin mineral aggregate, and the contact area between hot air and the mineral aggregate is increased, so that the low-temperature dehumidification time can be reduced, and the next step is carried out after a period of time, such as 10 minutes;
s24, high-temperature calcination stage: the air temperature is raised to 950-;
s3, cooling and charging:
the kaolin calcined from the roasting drum flows out of the end of the drum, enters the receiving hopper 7 and finally flows into a packaging machine for packaging.
Further, as shown in fig. 1, the system for the baking in step S2 is as follows: the device comprises a roasting roller 2, a screw conveyor 1, an air outlet pipe 4, fuel 5, an air mixing chamber 6, a receiving hopper 7 and a cooler 8, wherein the screw conveyor 1 is connected to the left end of the roasting roller 2, kaolin mineral aggregate 3 is conveyed into the roasting roller 2, hot air after the fuel 5 is combusted enters the air mixing chamber 6 and then is introduced into the right end of the roasting roller 2 through the air outlet pipe 4, the receiving hopper 7 receives the calcined kaolin from the tail end of the roasting roller 2, and then the calcined kaolin enters the cooler 8 to be cooled so as to perform the subsequent kaolin packaging process flow.
Preferably, the axis of the roasting drum 2 is inclined at an angle to the horizontal, the angle to the horizontal being 2-5 degrees.
Further, as shown in fig. 2, the roasting drum 2 includes a drum body 9, a plurality of material-limiting convex ribs 10 are arranged in the drum body 9, the material-limiting convex ribs 10 extend along the axis direction of the drum body 9, a material-bearing groove 11 is formed between the two limiting convex ribs 10, a material vibrating device 12 is arranged in the material-bearing groove 11, the upper surface of the material vibrating device 12 is lower than the upper surface of the limiting convex ribs 10, so that the material can stay in the material-bearing groove 11 when rotating along with the drum, and the material is only downwards sprinkled to the bottom of the drum due to the influence of gravity when rotating to a higher position along with the drum, and the hot air introduced into the drum at the moment can be very comprehensive and uniformly contacted with kaolin particles, thereby achieving the purpose of rapid and uniform heating.
Further, as shown in fig. 3, the material vibrating device 12 includes a material raising flexible plate 15 disposed on the inner wall of the barrel 9, the material raising flexible plate 15 is assembled by a plurality of combination board units 18, each combination board unit 18 includes a first bearing plate 19, a second bearing plate 20, a balance spring 17 and a second aluminum ball 16, the middle of the first bearing plate 19 is rotatably disposed on the inner wall of the barrel 9 through a first hinge seat 21, the middle of the second bearing plate 20 is rotatably disposed on the inner wall of the barrel 9 through a second hinge seat 22, the left end of the first bearing plate 19 is a concave hollow sleeve structure 25, the right end of the first bearing plate 19 is a left ball arc structure 23, the left end of the second bearing plate 20 is a right ball arc structure, the right end of the second bearing plate is a convex plate structure 26, the second aluminum ball 16 is disposed in a spherical space formed by the left ball arc structure 23 and the right ball arc structure 24, and one section of the balance spring 17 is fixed on the inner wall of the cylinder 9, the other end of the balance spring is fixed on the second aluminum ball 16, and the assembly of each combined plate unit 18 is completed through a convex plate structure 26 and a concave hollow sleeve structure 25.
Further, when the material raising flexible plate 15 is located at the lowest end of the roasting drum 2, the gravity of the second aluminum balls 16 and the balance spring 17 work together, so that the material raising flexible plate 15 is located at a horizontal initial state. Preferably, the hinge seats are each located at the midpoint of the bearing plate.
Further, the assembling structure of the convex plate structure 26 and the concave hollow sleeve structure 25 can enable a certain degree of freedom of rotation between the two combined plate units 18, so that the adjacent combined plate units 18 can be linked.
Further, still include aluminium ball 14, aluminium ball 14 can only roll in aluminium ball spacing collar 13, and aluminium ball spacing collar 13 is fixed to be set up in the internal surface of limit material protruding muscle 10, and aluminium ball spacing collar 13 distributes along the axis direction of barrel 9 has a plurality of, preferably, the quantity of aluminium ball spacing collar 13 is the same with the quantity of aluminium ball two, and aluminium ball spacing collar 13 corresponds and distributes in aluminium ball two 16 inboards.
Further, in step S1, the first pulverizing device is a crusher, and the second pulverizing device is a ball mill.
Preferably, the fuel is natural gas or coal.
Preferably, a discharging structure controlled by a valve switch is arranged on the right side of the roasting drum 2 and is opened when discharging is needed, so that kaolin materials can enter the receiving hopper 7.
Preferably, the left end of the first receiving plate 19 and the right end of the second receiving plate 20 are connected by, for example, elastic sleeves, so that the first receiving plate and the second receiving plate have a certain degree of freedom of rotation.
Preferably, the first bearing plate 19 and the second bearing plate 20 can be connected by a ball joint, for example, the second aluminum ball 16 is fixedly arranged on the right side of the first bearing plate, and the left side of the second bearing plate is provided with a socket structure matched with the first bearing plate.
Preferably, the roasting drum of the present invention rotates by arranging a gear ring at the outer wall of the drum and engaging with the gear ring after the reducer is driven by the motor or the hydraulic motor, and the driving mechanism is not the key point of the present invention, and therefore, the details are not described herein.
Preferably, the aluminum ball limiting ring 13 may be of a guide rail plate structure with two parallel guide rails, and a limiting groove is provided in the guide rail plate, and two ends of the aluminum ball are engaged in the limiting groove, so as to ensure that the aluminum ball limiting ring can move along the aluminum ball limiting ring.
Preferably, in order to manually control the fluctuation degree of the material raising flexible plate 15, driving oil cylinders can be arranged at the ends, far away from the second aluminum ball 16, of the first bearing plate 19 and the second bearing plate 20, and the driving oil cylinders are connected between the barrel 9 and the bearing plates, so that the fluctuation degree and the frequency of the material raising flexible plate 15 can be controlled by controlling the expansion and contraction of the driving oil cylinders, and through an additionally arranged driving oil cylinder structure, the control of the material raising flexible plate 15 can be controlled actively and passively, the control mode of the material vibrating device 12 is increased, the function can be further exerted, and the controllability of kaolin particles during calcination can be further improved.
When the kaolin is roasted, the kaolin particles can be retained in the kaolin-bearing grooves 11, the kaolin particles can be attached to the inner wall of the roller when the roller rotates and can move to a higher position along with the movement of the roller, the kaolin particles in the kaolin-bearing grooves 11 are slowly poured out after moving to the higher position, the sprayed particles are slowly dispersed along with falling, and hot air introduced from the right side of the roller can well contact with the dispersed kaolin particles, so that the kaolin can be more uniformly and efficiently roasted; meanwhile, as the material raising flexible plate 15 is arranged on the inner wall of the roller, the aluminum balls 16 are acted by centrifugal force along with the rotation of the roller, so that the bearing plate close to one end of the aluminum balls 16 sinks, and the bearing plate floats upwards due to the influence of the double forces of the aluminum balls when the aluminum balls move to the top along with the rotation of the roller, and as the balance spring 17 is arranged on the material raising flexible plate 15, the bearing plate can accumulate and release energy, so that the bearing plate moves between floating and sinking, in general, along with the rotation of the roller, the whole material raising flexible plate 15 does up-and-down fluctuation movement similar to waves, and the material raising flexible plate 15 in up-and-down fluctuation movement can disperse and vibrate the material in the material bearing groove 11, so that kaolin particles can be uniformly heated and fully calcined; further, a series of first aluminum balls are arranged in the cylinder 9, can rotate in the cylinder along with the rotation of the roller and can collide with kaolin particles, so that the particles can be further dispersed, and the kaolin particles are more uniform; simultaneously, because included aluminium ball one and aluminium ball two in the cylinder, also can grind the kaolin granule between them, simultaneously because the aluminium ball is metal material, it can store the heat in internal for except using hot-blast as the heat source, the aluminium ball also can be as the heat source, and then can carry out more abundant heating to kaolin.
In conclusion, according to the method for preparing kaolin by resource utilization of the residue soil of the urban building engineering, disclosed by the invention, when the kaolin is calcined, the material bearing groove, the material vibration device and the aluminum balls are arranged in the roasting roller, so that the kaolin can rotate along with the roller II and can be uniformly calcined without local overburning through the triple effects of sprinkling, vibrating and colliding, and the effect of increasing the calcination efficiency is simultaneously realized, so that the kaolin prepared by the process calcination has the advantages of uniform fineness and high activity.
Claims (8)
1. A method for preparing kaolin by resource utilization of residue soil of urban building engineering is characterized by comprising the following steps: the method comprises the following steps:
s1, crushing:
kaolin ore enters a first crushing device from a bin through a hopper to be crushed to form at least 90% of coarse materials with the particle size of less than 30 mm; then pouring the mixture into a second crushing device through a conveyor belt for dry fine crushing to form fine materials with the particle size of at least 90 percent smaller than 1 mm;
s2, roasting:
s21, preheating: igniting the fuel to enable hot air to enter the roasting roller from the air outlet pipe, controlling the temperature of the hot air at 110 ℃ and preheating for a period of time, and then carrying out the next step;
s22, feeding: conveying the fine materials into a roasting roller by a screw conveyer;
s23, low-temperature dehumidification stage: keeping the air temperature at 110 ℃ and keeping the low rotating speed of the roasting roller at 0.3-0.8 r/min, wherein a material vibrating device in the roasting roller can disperse kaolin mineral aggregates, a material bearing groove in the barrel of the roasting roller can carry the kaolin mineral aggregates to a high position and then sprinkle the kaolin mineral aggregates, and the contact area between hot air and the mineral aggregates is increased, so that the low-temperature dehumidification time can be reduced, and the next step is carried out after a period of time;
s24, high-temperature calcination stage: the air temperature is raised to 950-;
s3, cooling and charging:
the kaolin calcined by the roasting roller flows out of the end part of the roller, enters a receiving hopper and finally flows into a packaging machine for packaging;
the roasting roller (2) comprises a roller body (9), a plurality of material limiting convex ribs (10) are arranged in the roller body (9), the material limiting convex ribs (10) extend and are distributed along the axis direction of the roller body (9), a material bearing groove (11) is formed between the two limiting convex ribs (10), a material vibrating device (12) is arranged in the material bearing groove (11), the upper surface of the material vibrating device (12) is lower than the upper surface of the limiting convex ribs (10), so that materials can stay in the material bearing groove (11) when rotating along with the roller, the materials are downwards sprayed to the bottom of the roller due to the influence of gravity when rotating to a higher position along with the roller, and hot air introduced into the roller can be fully and uniformly contacted with kaolin particles at the moment, and the purpose of rapid and uniform heating is achieved; the material vibrating device (12) comprises a material lifting flexible plate (15) arranged on the inner wall of the barrel body (9), the material lifting flexible plate (15) is formed by assembling a plurality of combination plate units (18), each combination plate unit (18) comprises a first bearing plate (19), a second bearing plate (20), a balance spring (17) and a second aluminum ball (16), the middle of the first bearing plate (19) is rotatably arranged on the inner wall of the barrel body (9) through a first hinged seat (21), the middle of the second bearing plate (20) is rotatably arranged on the inner wall of the barrel body (9) through a second hinged seat (22), the left end of the first bearing plate (19) is concavely provided with a hollow sleeve structure (25), the right end of the first bearing plate is provided with a left ball cambered surface structure (23), the left end of the second bearing plate (20) is provided with a right ball cambered surface structure, the right end of the second bearing plate is provided with a convex plate structure (26), the second aluminum ball (16) is arranged in a spherical space formed by the left cambered surface structure (23) and the right cambered surface structure (24), one end of the balance spring (17) is fixed on the inner wall of the cylinder body (9), the other end of the balance spring is fixed on the aluminum ball II (16), and the assembly of each combined plate unit (18) is completed through the convex plate structure (26) and the concave hollow sleeve structure (25).
2. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 1, characterized by comprising the following steps: the system used for firing in step S2 is as follows: including calcination cylinder (2), screw conveyer (1), go out tuber pipe (4), fuel (5), air mixing chamber (6), connect hopper (7) and cooler (8), screw conveyer (1) inserts the left end of calcination cylinder (2), carry into calcination cylinder (2) with kaolin mineral aggregate (3), hot-air after fuel (5) burning gets into air mixing chamber (6) back and lets in calcination cylinder (2) right-hand member through going out tuber pipe (4), it receives the kaolin of calcining well from calcination cylinder (2) end to connect hopper (7), then cool off in getting into cooler (8), in order to carry out the packaging process flow of follow-up kaolin.
3. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 2, characterized by comprising the following steps: the axis of the roasting roller (2) is inclined at a certain angle with the horizontal line, and the included angle with the horizontal line is 2-5 degrees.
4. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 1, characterized by comprising the following steps: when the material raising flexible plate (15) is positioned at the lowest end of the roasting roller (2), the gravity of the second aluminum balls (16) is balanced with the balance spring (17), so that the material raising flexible plate (15) is positioned in a horizontal initial state.
5. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 1, characterized by comprising the following steps: the hinged seats are all positioned at the center of the bearing plate.
6. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 1, characterized by comprising the following steps: the convex plate structure (26) and the assembly structure of the concave hollow sleeve structure (25) can enable a certain degree of freedom of rotation to be formed between the two groups of plywood units (18), so that the adjacent plywood units (18) can be linked.
7. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 1, characterized by comprising the following steps: still include aluminium ball (14), aluminium ball (14) can only roll in aluminium ball spacing collar (13), and aluminium ball spacing collar (13) are fixed to be set up in limit material protruding muscle (10) internal surface, and aluminium ball spacing collar (13) distribute along the axis direction of barrel (9) has a plurality of.
8. The method for preparing kaolin by resource utilization of the residue soil of the urban building engineering according to claim 1, characterized by comprising the following steps: in step S1, the first pulverizing apparatus is a crusher and the second pulverizing apparatus is a ball mill.
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