CN115925283A - Calcium carbonate suspension calcination preparation process - Google Patents
Calcium carbonate suspension calcination preparation process Download PDFInfo
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- CN115925283A CN115925283A CN202211502875.2A CN202211502875A CN115925283A CN 115925283 A CN115925283 A CN 115925283A CN 202211502875 A CN202211502875 A CN 202211502875A CN 115925283 A CN115925283 A CN 115925283A
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- 238000001354 calcination Methods 0.000 title claims abstract description 118
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 81
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 40
- 239000000725 suspension Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 235000019738 Limestone Nutrition 0.000 claims abstract description 56
- 239000006028 limestone Substances 0.000 claims abstract description 56
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 27
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 27
- 239000004571 lime Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 26
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims description 29
- 239000007921 spray Substances 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 17
- 239000006185 dispersion Substances 0.000 claims description 17
- 230000001681 protective effect Effects 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 28
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 11
- 238000004378 air conditioning Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000004579 marble Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
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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
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Vertical, Hearth, Or Arc Furnaces (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to the technical field of calcium carbonate preparation, in particular to a suspension calcination preparation process of calcium carbonate, which comprises three support frames, a calciner, a heating assembly, an air inlet group and a rotary material spraying group. According to the calcium carbonate suspension calcination preparation process, the powdery limestone is uniformly scattered into the calcining furnace from top to bottom in a layered manner through the rotary scattering group, so that the powdery limestone is quickly suspended in the calcining furnace and is heated and decomposed by the heating of the heating assembly to form lime powder, the calcium carbonate suspension calcination efficiency and the calcium carbonate suspension calcination uniformity are improved, the time for the powdery limestone to stay in the calcining furnace can be prolonged by the rotation of the lower charging barrel and the spraying pipeline, and the calcium carbonate suspension calcination efficiency is improved.
Description
Technical Field
The invention relates to the technical field of calcium carbonate preparation, in particular to a suspension calcination preparation process of calcium carbonate.
Background
Calcium carbonate is an inorganic compound, is white fine crystalline powder, is tasteless and odorless, is a main component of limestone, marble and the like, is one of common substances on earth, exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also a raw material of building materials and industry.
At present when carrying out the suspension calcination to likepowder limestone, directly drop into the calciner with the likepowder limestone ground, then form the mode of vortex through blowing and make likepowder limestone suspension in the calciner to be heated and calcine, but such likepowder limestone input mode easily leads to likepowder limestone to pile up the circumstances of unloading, causes likepowder limestone to be heated inhomogeneous, and the preheating time of likepowder limestone is shorter, has reduced the calcination efficiency of likepowder limestone.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme that a calcium carbonate suspension calcination preparation process is adopted, a calcium carbonate suspension calcination preparation device is used, the calcium carbonate suspension calcination preparation device comprises three support frames and a calciner, the calciner is supported and fixed through the three support frames connected with the side wall of the calciner along the circumferential direction, the lower end of the calciner is of an arc-shaped structure, the top of the calciner is provided with a feed hopper communicated with the inner cavity of the calciner, the top of the calciner is provided with an exhaust pipe communicated with the inner cavity of the calciner, the lower end of the exhaust pipe is provided with a filter screen for preventing suspended limestone from floating out, and the bottom of the calciner is provided with a discharge valve.
The calcining furnace is provided with a heating assembly for heating limestone in the calcining furnace and an air inlet group for blowing the limestone.
The inner chamber top of calcining furnace is provided with rotatory material group that spills, rotatory material group that spills includes lower feed cylinder, the lateral wall of lower feed cylinder is seted up from the top down and is evenly arranged and along its crisscross bin outlet of circumference, the guide frame that aligns one by one with the bin outlet is installed to the inner wall of lower feed cylinder, the guide frame is the equal open-ended three horn type fill structure of one end relative with the bin outlet with the top, the one end that the bin outlet was kept away from to the guide frame that arranges along lower feed cylinder circumference inclines to feed cylinder axis top, the spraying pipe who communicates and aligns one by one with the bin outlet is installed to the lateral wall of lower feed cylinder, the length that sprays the pipe reduces from the top down in proper order, the dispersion cover that vertical cross-section is the type of falling V structure is installed through the floor to lower feed cylinder lower extreme inner wall, the rotation axis of connection is rotated to the top of calcining furnace, the rotation axis all is fixed the cover with the lateral wall of lower feed cylinder and is equipped with drive gear, the meshing transmission between two drive gear, the top of rotation axis is connected with the driving motor who is used for driving it and carrying out the rotation after running through calcining furnace.
The specific calcining preparation process when the suspension calcining preparation device is adopted to carry out suspension calcining preparation of calcium carbonate is as follows: s1, feeding: feeding limestone into the calcining furnace from the feed hopper and the feeding barrel;
s2, calcining: limestone is suspended in the calcining furnace to be calcined under the blowing action of the feeding group;
s3, cooling: and discharging the calcined lime powder from the lower end of the calcining furnace after the temperature of the calcined lime powder is reduced.
Preferably, the heating component comprises a feeding channel formed in the side wall of the calcining furnace, the inner side wall of the calcining furnace is provided with combustion sending pipes which are sequentially arranged from top to bottom and uniformly arranged along the circumferential direction of the calcining furnace, the combustion sending pipes are communicated with the feeding channel, one end of each combustion sending pipe, far away from the inner side wall of the calcining furnace, is provided with a heating rod, and the outer side wall of the calcining furnace is provided with a feeding pipe communicated with the feeding channel.
Preferably, the air inlet group includes the dispersion tank that the calciner lateral wall was seted up, the admission pipe that communicates with the dispersion tank is installed to the lateral wall of calciner, the conveyer pipe that arranges in proper order and length from the top down lengthened in proper order is installed to the inside wall of calciner, conveyer pipe and dispersion tank intercommunication, the toroidal tube is installed to the one end that the conveyer pipe kept away from the calciner inside wall, a plurality of toroidal tube diameters that arrange from the top down reduce in proper order, the toroidal tube is located the spray line below that the circumference of subtend was arranged mutually, the lateral wall of toroidal tube is connected through the anchor strut who arranges along toroidal tube circumference with the inside wall of calciner, the shower nozzle of evenly arranging along its circumference and rather than the intercommunication is installed at the top of toroidal tube.
Preferably, a cooling group located below the lower feed cylinder is installed on the inner wall of the calcining furnace, the cooling group comprises supporting rods which are installed on the inner wall of the calcining furnace and evenly distributed along the circumferential direction of the calcining furnace, top cover seats located below the dispersing covers are jointly installed on the supporting rods, the vertical cross sections of the top cover seats are conical structures of triangular shapes with upward vertex angles, mounting grooves are formed in the lower end faces of the top cover seats, rotary frames connected with cavities are rotated on the lower end faces of the top cover seats, the vertical cross sections of the rotary frames are conical structures of triangular shapes with downward vertex angles, connecting pipes concentric with the rotary frames are rotatably installed at the tops of the rotary frames, air inlet pipes communicated with the connecting pipes are installed on the top cover frames, one ends, far away from the connecting pipes, of the air inlet pipes penetrate through the top cover frames and the calcining furnace, annular seats are rotatably connected with the rotary frames in a sleeved mode on the connecting pipes, blowing holes evenly distributed are formed in the side walls of the rotary frames, rotating motors are installed in the mounting grooves, rotating shafts are fixedly connected with rotating gears on output shafts of the rotating motors, rotating shafts and the annular seats are all sleeved with rotating gears, and meshing transmission is achieved between the two rotating gears.
Preferably, the outer side wall of the spray head is provided with a protective cover through an inclined frame plate, the vertical section of the protective cover is of an inverted V-shaped structure, the side wall of the protective cover is provided with air blowing through grooves which are evenly distributed along the axial direction of the protective cover, and the distance between the tops of the two opposite air blowing through grooves is greater than the outer diameter of the spray head.
Preferably, the vertical section of the side wall of the discharging barrel below the spraying pipeline is of a V-shaped structure with two opposite vertex angles, and the openings of the two V-shaped sections face the inner wall of the calcining furnace.
Preferably, the air blowing holes are of a V-shaped structure with the lower ends inclined towards the axis of the calcining furnace.
The invention has the beneficial effects that: 1. according to the calcium carbonate suspension calcination preparation process, the powdery limestone is uniformly scattered into the calcination furnace from top to bottom in a layered manner through the rotary scattering group, so that the powdery limestone is quickly suspended in the calcination furnace and is heated and decomposed by the heating of the heating assembly to form lime powder, the calcium carbonate suspension calcination efficiency and the calcium carbonate suspension calcination uniformity are improved, the time for the powdery limestone to stay in the calcination furnace can be prolonged by the rotation of the lower charging barrel and the spraying pipeline, and the calcium carbonate suspension calcination efficiency is improved.
2. According to the invention, the lime powder falls downwards below the top cover seat under the action of gravity, cold air enters the rotating frame through the air inlet pipe and the connecting pipe, then cold air is blown to the falling lime powder through the air blowing holes for cooling, and the falling lime powder is blown to the middle of the lower end of the calcining furnace for cooling when cold air is blown out of the air blowing holes, so that the problem that a large amount of lime powder flies upwards during air blowing and cooling is avoided.
3. After the lime powder is calcined, the external air pump stops conveying air to the annular pipe, the spray head does not blow air any more, the lime powder falls downwards under the action of self gravity due to reduction of air flow speed, and the protective cover can prevent the falling lime powder from entering the spray head and influencing the next use of the spray head.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic main perspective structure of the present invention.
Fig. 3 is a partially sectional perspective view of the present invention.
Fig. 4 is a first partial perspective view of the present invention.
Fig. 5 is a second partial perspective view of the present invention.
Fig. 6 is a top view of the present invention.
Fig. 7 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 6 in accordance with the present invention.
Fig. 8 is a partial enlarged view of fig. 7 at B.
Fig. 9 is a partial enlarged view of the invention at C of fig. 7.
In the figure: 1. a support frame; 2. a calciner; 3. a feed hopper; 4. a heating assembly; 40. a feed channel; 41. a fuel delivery pipe; 42. a heating rod; 43. a feed pipe; 5. an air inlet group; 50. a dispersion tank; 51. an inlet pipe; 53. a delivery pipe; 54. an annular tube; 55. a reinforcing rod; 56. a spray head; 560. a protective cover; 561. an air blowing through groove; 6. rotating the material spraying group; 60. a material guide frame; 61. a spray pipe; 62. a dispersion cover; 63. a rotating shaft; 64. a drive gear; 65. feeding the material barrel; 7. cooling; 70. a support bar; 71. a top cover seat; 72. a rotating frame; 73. a connecting pipe; 74. an air inlet pipe; 75. an annular seat; 76. an air blowing hole.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Referring to fig. 2, 3 and 7, a calcium carbonate suspension calcination preparation process uses a calcium carbonate suspension calcination preparation device, the calcium carbonate suspension calcination preparation device includes three support frames 1 and a calciner 2, the calciner 2 is supported and fixed by the three support frames 1 connected with the side wall of the calciner 2 along the circumferential direction, the lower end of the calciner 2 is of an arc-shaped structure, a feed hopper 3 communicated with the inner cavity of the calciner 2 is installed at the top of the calciner 2, an exhaust pipe communicated with the inner cavity of the calciner 2 is installed at the top of the calciner 2, a filter screen is installed at the lower end of the exhaust pipe for preventing suspended limestone from floating out, and a discharge valve is installed at the bottom of the calciner 2.
The calcining furnace 2 is provided with a heating component 4 for heating the limestone in the calcining furnace 2 and an air inlet group 5 for blowing the limestone.
Referring to fig. 3 and 7, the heating assembly 4 includes a feeding channel 40 formed on the side wall of the calciner 2, the inner side wall of the calciner 2 is provided with combustion sending pipes 41 which are sequentially arranged from top to bottom and uniformly arranged along the circumferential direction of the calciner 2, the combustion sending pipes 41 are communicated with the feeding channel 40, one end of each combustion sending pipe 41, which is far away from the inner side wall of the calciner 2, is provided with a heating rod 42, and the outer side wall of the calciner 2 is provided with a feeding pipe 43 communicated with the feeding channel 40.
The fuel enters the combustion feed pipe 41 through the feed pipe 43 and the feed passage 40, the fuel fed by the combustion feed pipe 41 causes the heating rod 42 to calcine the powdered limestone, and the suspended powdered limestone is heated by contacting with the heating rod 42.
Referring to fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, the top of the inner cavity of the calciner 2 is provided with a rotary material spraying group 6, the rotary material spraying group 6 includes a lower material barrel 65, the side wall of the lower material barrel 65 is provided with a material discharging port which is uniformly arranged from top to bottom and staggered along the circumferential direction of the lower material barrel, the inner wall of the lower material barrel 65 is provided with a material guiding frame 60 aligned with the material discharging port one by one, the material guiding frame 60 is a triangular hopper structure with one end opposite to the material discharging port at the top and open, one end of the material guiding frame 60, which is arranged along the circumferential direction of the lower material barrel 65, away from the material discharging port, inclines towards the upper side of the axis of the lower material barrel 65, the outer side wall of the lower material barrel 65 is provided with a spraying pipeline 61 which is communicated with the material discharging port and aligned with the material guiding frame 60 one by one, the length of the spraying pipeline 61 is reduced from top to bottom in sequence, the inner wall of the lower end of the lower material discharging barrel 65 is provided with a dispersion cover 62 with a vertical section which is of an inverted V-shaped structure through a rib plate, the top of the rotary shaft 63 is rotatably connected with a rotary shaft 63, the rotary driving gear 64, the rotary shaft 63 and the side wall of the rotary calciner 65 are fixedly provided with a driving gear 64, the rotary driving motor for driving the rotary calciner 2, the rotary motor.
The powdery limestone enters the lower charging barrel 65 from the feeding hopper 3 at the top of the calcining furnace 2 in the heating process of the heating component 4, at the moment, the rotating shaft 63 is driven by the driving motor to rotate, the rotating shaft 63 drives the lower charging barrel 65 to rotate through the matching between the driving gears 64, the powdery limestone after entering the lower charging barrel 65 falls onto the dispersion covers 62 at the lower ends and the plurality of guide frames 60 staggered up and down, then slides downwards from the inclined material pouring frame to the discharge port to enter the corresponding spraying pipelines 61, the powdery limestone is sprayed into the calcining furnace 2 in layers through the spraying pipelines 61 which are arranged up and down and the lengths of which are sequentially reduced from top to bottom, the powdery limestone falling at the bottom slides downwards along the side walls of the dispersion covers 62 to enter the calcining furnace 2, so that the effect of uniformly spraying the powdery limestone is realized, the air can be conveniently blown by the air inlet group 5, the powdery limestone quickly suspended in the calcining furnace 2 can be heated and decomposed to form lime powder through the heating of the heating component 4, the efficiency of calcium carbonate suspension calcination and the uniformity of calcium carbonate suspension calcination are improved, and the efficiency of calcium carbonate suspension calcination of the calcium carbonate suspension calcination can be improved, and the calcium carbonate suspension calcination of the powdery limestone can be increased by the rotation of the lower charging barrel 65 and the spraying pipelines 61.
Referring to fig. 7, the vertical cross section of the side wall of the lower charging barrel 65 below the spraying pipe 61 is a V-shaped structure with two opposite vertex angles, and the openings of the two V-shaped cross sections face the inner wall of the calcining furnace 2, so that the powdery limestone entering the lower charging barrel 65 from the feeding hopper 3 and not falling on the guide frame 60 slides down along the side wall of the lower charging barrel 65 in the process of falling downwards, and is fully contacted with the side wall of the lower charging barrel 65, so that the side wall of the lower charging barrel 65 heated by the heating rod 42 can convey heat energy to the limestone, the powdery limestone can be preheated, and the limestone heating efficiency is improved.
Referring to fig. 3, 5, 7 and 8, the air inlet group 5 includes a dispersion groove 50 formed on the sidewall of the calciner 2, an inlet pipe 51 communicated with the dispersion groove 50 is installed on the outer sidewall of the calciner 2, a delivery pipe 53 which is sequentially arranged from top to bottom and is sequentially lengthened from top to bottom is installed on the inner sidewall of the calciner 2, the delivery pipe 53 is communicated with the dispersion groove 50, an annular pipe 54 is installed at one end of the delivery pipe 53, which is far away from the inner sidewall of the calciner 2, the diameters of a plurality of annular pipes 54 which are sequentially arranged from top to bottom are reduced, the annular pipe 54 is located below the opposite circumferentially arranged spray pipes 61, the outer sidewall of the annular pipe 54 is connected with the inner sidewall of the calciner 2 through a reinforcing rod 55 which is circumferentially arranged along the annular pipe 54, and spray nozzles 56 which are uniformly arranged along the circumferential direction and are communicated with the annular pipe 54 are installed at the top of the annular pipe 54.
The inlet pipe 51 is connected with an air pump for intermittently blowing air from the outside, the external air pump conveys hot gas into the dispersing groove 50 through the inlet pipe 51, so that the gas enters the plurality of conveying pipes 53 and the annular pipe 54 through the dispersing groove 50, then the gas is sprayed upwards through the spray nozzle 56, the airflow makes the powdery limestone suspend in the calcining furnace 2, the powdery limestone suspended in the calcining furnace 2 is dispersed and uniformly heated, calcium carbonate in the calcining and heating process of the limestone is subjected to decomposition reaction, the reaction speed of the powdery limestone is high in the suspension state, the decomposition is complete, the calcining heat consumption and the power consumption in the lime production process can be effectively reduced, the lime production is green, environment-friendly and modernized, and after the calcination of the powdery limestone is completed, the external air pump stops intermittently, so that the calcined lime powder falls downwards.
Referring to fig. 8, a protection cover 560 is mounted on the outer side wall of the spray head 56 through an inclined frame plate, the vertical section of the protection cover 560 is an inverted V-shaped structure, air blowing through grooves 561 evenly distributed along the axial direction of the protection cover 560 are formed in the side wall of the protection cover 560, and the distance between the tops of the two opposite air blowing through grooves 561 is greater than the outer diameter of the spray head 56.
When wind is sprayed out of the spray head 56, the wind blows upwards through the blowing through grooves 561 on the protective covers 560, so that the powdery limestone sprayed by the spraying pipes 61 is blown away, the powdery limestone is suspended in the calcining furnace 2 under the blowing of the wind, after the calcination of the limestone is completed, the external air pump stops conveying air to the annular pipe 54, the spray head 56 does not blow any more, the powdery limestone falls downwards under the action of self gravity due to the reduction of the air flow velocity, and at the moment, the protective covers 560 can prevent the falling lime powder from entering the spray head 56 and influencing the next use of the spray head 56.
Referring to fig. 3, 7 and 9, a cooling group 7 located below the lower charging barrel 65 is installed on the inner wall of the calciner 2, the cooling group 7 includes support rods 70 evenly arranged along the circumferential direction of the inner wall of the calciner 2, a top cover seat 71 located below the dispersing cover 62 is installed on the plurality of support rods 70 together, the vertical section of the top cover seat 71 is in a conical structure with an upward triangular top angle, a mounting groove is formed in the lower end face of the top cover seat 71, a rotating frame 72 connected with a cavity is rotated on the lower end face of the top cover seat 71, the vertical section of the rotating frame 72 is in a conical structure with a downward triangular top angle, a connecting pipe 73 concentric with the rotating frame 72 is rotatably installed at the top of the rotating frame 72, an air inlet pipe 74 communicated with the connecting pipe 73 is installed on the top cover frame, one end of the air inlet pipe 74 far away from the connecting pipe 73 penetrates through the top cover frame and the calciner 2, an annular seat 75 on the rotating frame 72 is rotatably connected with an annular seat 75, blow holes 76 evenly arranged on the side wall of the rotating frame 72, a rotating motor is installed in the mounting groove, a rotating shaft is fixedly connected with a rotating gear on the output shaft of the rotating motor, and a rotating gear is sleeved on the annular seat 75, and two rotating gear is meshed.
Referring to fig. 9, the air blowing holes 76 are in a V-shaped structure with the lower end inclined toward the axis of the calcining furnace 2, and when cold air is blown out from the air blowing holes 76, the dropped lime powder is blown toward the middle of the lower end of the calcining furnace 2 for cooling, so that the problem that a large amount of lime powder flies upward during air blowing cooling is avoided.
Referring to fig. 1, a process for preparing calcium carbonate by suspension calcination comprises the following steps: s1, feeding: powdery limestone enters a discharging barrel 65 from a feed hopper 3 at the top of the calcining furnace 2, at the moment, a rotating shaft 63 is driven by a driving motor to rotate, the rotating shaft 63 drives the discharging barrel 65 to rotate through the matching between driving gears 64, the powdery limestone, after entering the discharging barrel 65, falls onto a plurality of material guide frames 60 and a dispersion cover 62 at the lower end which are staggered up and down, then slides down from an inclined material pouring frame to a discharge port to enter a corresponding spraying pipeline 61, and then is sprayed into the calcining furnace 2 layer by layer through the spraying pipelines 61 which are distributed up and down and the length of which is reduced from top to bottom in sequence, and the powdery limestone falling at the lowest part slides down along the side wall of the dispersion cover 62 to enter the calcining furnace 2.
S2, calcining: an external air pump conveys hot gas into the dispersing groove 50 through an inlet pipe 51, so that the gas enters a plurality of conveying pipes 53 and annular pipes 54 through the dispersing groove 50, then the gas is sprayed upwards through a spray nozzle 56, the powdery limestone is suspended in the calcining furnace 2 through the air flow, the powdery limestone suspended in the calcining furnace 2 is dispersed and uniformly heated, and calcium carbonate in the calcining and heating process of the limestone is decomposed to form lime powder.
S3, cooling: when the lime powder is cooled, the calcined lime powder falls downwards below the top cover seat 71 under the action of gravity, cold air enters the rotating frame 72 through the air inlet pipe 74 and the connecting pipe 73, then the cooled air is blown through the blowing holes 76 to cool the falling lime powder, and the lime powder is discharged from the lower end of the calcining furnace 2 after being cooled.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a calcium carbonate suspension calcines preparation technology, it has used a calcium carbonate suspension to calcine preparation facilities, and this calcium carbonate suspension calcines preparation facilities includes three support frame (1) and calcines burning furnace (2), its characterized in that: the calcining furnace (2) is supported and fixed through three support frames (1) connected with the side wall of the calcining furnace along the circumferential direction, the lower end of the calcining furnace (2) is of an arc-shaped structure, and the top of the calcining furnace (2) is provided with a feed hopper (3) communicated with the inner cavity of the calcining furnace;
the calcining furnace (2) is provided with a heating component (4) for heating the limestone in the calcining furnace (2) and an air inlet group (5) for blowing the limestone;
the top of the inner cavity of the calcining furnace (2) is provided with a rotary sprinkling group (6), the rotary sprinkling group (6) comprises a lower charging barrel (65), the side wall of the lower charging barrel (65) is provided with discharge ports which are uniformly distributed from top to bottom and staggered along the circumferential direction of the lower charging barrel, the inner wall of the lower charging barrel (65) is provided with a guide frame (60) which is aligned with the discharge ports one by one, the guide frame (60) is of a triangular hopper structure with one end opposite to the top and the discharge ports open, one end, away from the discharge ports, of the guide frame (60) circumferentially distributed along the lower charging barrel (65) inclines towards the upper part of the axis of the lower charging barrel (65), the outer side wall of the lower charging barrel (65) is provided with spraying pipelines (61) which are communicated with the discharge ports and aligned with the guide frame (60) one by one, the lengths of the spraying pipelines (61) are sequentially reduced from top to bottom, the inner wall of the lower end of the lower charging barrel (65) is provided with a dispersing cover (62) with an inverted V-shaped vertical section through a ribbed plate, the top of the calcining furnace (2) is rotatably connected with a rotating shaft (63) and the side wall of the lower charging barrel (65) is fixedly sleeved with two driving gears (64);
the specific calcining preparation process when the suspension calcining preparation device is adopted to carry out suspension calcining preparation of calcium carbonate is as follows: s1, feeding: limestone is fed into the calcining furnace (2) from the feed hopper (3) and the blanking barrel (65);
s2, calcining: limestone is suspended in the calcining furnace (2) for calcining under the blowing action of the inlet group;
s3, cooling: and the calcined lime powder is discharged from the lower end of the calcining furnace (2) after being cooled.
2. The suspension calcination process for preparing calcium carbonate according to claim 1, wherein: the heating component (4) comprises a feeding channel (40) formed in the side wall of the calcining furnace (2), combustion sending pipes (41) which are sequentially arranged from top to bottom and evenly arranged along the circumferential direction of the calcining furnace (2) are installed on the inner side wall of the calcining furnace (2), the combustion sending pipes (41) are communicated with the feeding channel (40), heating rods (42) are installed at one ends, far away from the inner side wall of the calcining furnace (2), of the combustion sending pipes (41), and feeding pipes (43) communicated with the feeding channel (40) are installed on the outer side wall of the calcining furnace (2).
3. The suspension calcination process for preparing calcium carbonate according to claim 1, wherein: the air inlet group (5) comprises a dispersion groove (50) formed in the side wall of the calcining furnace (2), an inlet pipe (51) communicated with the dispersion groove (50) is installed on the outer side wall of the calcining furnace (2), a conveying pipe (53) which is sequentially arranged from top to bottom and is sequentially lengthened from top to bottom is installed on the inner side wall of the calcining furnace (2), the conveying pipe (53) is communicated with the dispersion groove (50), a ring pipe (54) is installed at one end, away from the inner side wall of the calcining furnace (2), of the conveying pipe (53), the diameters of a plurality of ring pipes (54) which are sequentially arranged from top to bottom are reduced, the ring pipes (54) are located below spraying pipelines (61) which are circumferentially arranged in opposite directions, the outer side wall of the ring pipe (54) is connected with the inner side wall of the calcining furnace (2) through reinforcing rods (55) which are circumferentially arranged along the ring pipes (54), and spray nozzles (56) which are uniformly arranged along the circumferential direction and communicated with the ring pipes (54) are installed at the top.
4. The suspension calcination process for preparing calcium carbonate according to claim 1, wherein: the inner wall of the calcining furnace (2) is provided with a cooling group (7) located below the lower charging barrel (65), the cooling group (7) comprises supporting rods (70) which are uniformly distributed along the circumferential direction of the inner wall of the calcining furnace (2), a top cover seat (71) located below the dispersing cover (62) is jointly installed on the supporting rods (70), the vertical section of the top cover seat (71) is of a conical structure with an upward triangular shape at the apex angle, a mounting groove is formed in the lower end face of the top cover seat (71), a rotating frame (72) connected with a cavity is rotated on the lower end face of the top cover seat (71), the vertical section of the rotating frame (72) is of a conical structure with a downward triangular shape at the apex angle, a concentric connecting pipe (73) is rotatably installed at the top of the rotating frame (72), an air inlet pipe (74) communicated with the connecting pipe (73) is installed on the top cover frame, one end, far away from the connecting pipe (73), penetrates through the top cover frame and the calcining furnace (2), an annular seat (75) on the rotating frame (72) is rotatably connected with the connecting pipe (73), and air blowing holes (76) uniformly distributed on the side wall of the rotating frame (72).
5. The suspension calcination process for preparing calcium carbonate according to claim 3, wherein: the outer side wall of the spray head (56) is provided with a protective cover (560) through an inclined frame plate, the vertical section of the protective cover (560) is of an inverted V-shaped structure, the side wall of the protective cover (560) is provided with air blowing through grooves (561) which are evenly distributed along the axial direction of the protective cover, and the distance between the tops of the two opposite air blowing through grooves (561) is greater than the outer diameter of the spray head (56).
6. The suspension calcination process for preparing calcium carbonate according to claim 1, characterized in that: the vertical section of the side wall of the lower charging barrel (65) below the spraying pipeline (61) is of a V-shaped structure with two opposite vertex angles, and the openings of the two V-shaped sections face the inner wall of the calcining furnace (2).
7. The suspension calcination process for preparing calcium carbonate according to claim 4, wherein: the air blowing holes (76) are of V-shaped structures, and the lower ends of the air blowing holes are inclined towards the axis of the calcining furnace (2).
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| CN117404912A (en) * | 2023-07-05 | 2024-01-16 | 江苏欧亿德新材料科技有限公司 | Calcining device for magnesium-calcium refractory material |
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