CN209857606U - Sticky wet powdery iron ore powder drying and scattering device - Google Patents
Sticky wet powdery iron ore powder drying and scattering device Download PDFInfo
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- CN209857606U CN209857606U CN201821761429.2U CN201821761429U CN209857606U CN 209857606 U CN209857606 U CN 209857606U CN 201821761429 U CN201821761429 U CN 201821761429U CN 209857606 U CN209857606 U CN 209857606U
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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
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Abstract
The utility model relates to a glutinous wet powdered iron ore powder drying and scattering device, glutinous wet iron ore powder add double helix hot flue gas desiccator, under the helical blade effect of intercrossing and relative rotation, adopt the high temperature flue gas to carry out indirect drying to glutinous wet iron ore powder. And (3) feeding the dried and preheated iron ore powder into a vertical material scattering machine, and in the process of scattering the dried agglomerated iron ore powder, adopting dried medium-temperature flue gas as a winnowing medium, and continuously preheating the iron ore powder to obtain the dried and preheated iron ore powder with uniform particle size. The utility model discloses the purpose that glutinous wet iron ore powder does not stick equipment in the drying, break up the medium particle size even, the energy resource consumption is low, environmental pollution is little, equipment structure is simple and just has been reached.
Description
Technical Field
The utility model belongs to the technical field of metallurgy and mineral engineering, and relates to a drying and scattering method and device for sticky wet powdery iron ore powder.
Background
97% of the reserves of iron ores in China are lean ores, wherein iron ore resources which are difficult to effectively treat by conventional gravity separation, magnetic separation and flotation technologies comprise limonite, siderite, sedimentary hematite and the like, and the quantity of the iron ore resources is nearly 200 hundred million tons. The refractory iron ores can be magnetized and roasted to convert weak magnetic iron oxides into strong magnetic artificial magnetite, and then the separation of iron minerals and gangue is realized by adopting a weak magnetic separation method, so that the method is an effective method for separating the refractory iron ores.
In devices such as shaft furnaces, rotary kilns and the like which are commonly used at home and abroad for magnetizing and roasting refractory iron ore, the inherent defects that the granularity of raw ore entering a kiln is coarse, the magnetizing reaction is difficult to go deep and complete, the reduced high-temperature roasted ore is partially reoxidized in the discharging and cooling process, the powdery iron ore cannot directly enter the kiln, the single-kiln productivity is low, the production cost is high and the like exist. At present, fluidized magnetic roasting of iron ore is one of effective methods for treating refractory iron ore at home and abroad.
In the aspect of fluidized magnetic roasting of refractory iron ore, the fluidized heating reduction reaction furnace and the novel magnetic roasting technology taking the fluidized heating reduction reaction furnace as the core are compared with the traditional magnetic roasting technology (such as a rotary kiln method), the biggest difference is that the original accumulation gas-solid heat exchange and mass transfer in the rotary kiln are changed into the fluidized gas-solid heat transfer process, the gas-solid enables materials to form a turbulent flow state through a fluidized bed, then the materials enter a preheater and form turbulent flow under the tangential wind action of a cyclone cylinder, and the mass transfer process in the dilute phase fluidized state is compared with the accumulation process in the rotary kiln, so that the fluidized heating reduction reaction furnace has the advantages that: (1) the contact area of the gas phase and the solid phase is large in the fluidization state, and the heat exchange, mass transfer and particle chemical reaction speed of the gas phase and the solid phase are high; (2) the fluidized preheating reduction reaction furnace is a counter-flow heat exchanger formed by connecting multi-stage airflow units in series from top to bottom, the material turbulence degree is high, the temperature difference between gas and solid and the concentration difference of reduction atmosphere are large, and the comprehensive transfer coefficient and the transfer power are large.
The iron ore powder used in the iron ore fluidization suspension magnetization roasting process is required to have the water content below 1 percent and the granularity of-200 meshes accounting for more than 40 percent. At present, the water content of iron ore powder obtained by wet grinding of iron ore by a ball mill is generally about 11%, and fluidized suspension magnetizing roasting cannot be directly carried out. After the iron ore powder is dried by adopting drying equipment, because wet materials of the iron ore powder have certain viscosity, the iron ore powder can be agglomerated after being dried, and can not be directly subjected to suspension magnetizing roasting. In order to obtain iron ore powder with water content and granularity meeting the requirements, the sticky and wet iron ore powder is generally dried and then scattered.
In the process of drying sticky and wet iron ore powder, because the material contains higher silicon dioxide, the wet fine-grained material has certain viscosity, when equipment such as an airflow dryer, a vibrating bed dryer, a rotary drum dryer, a boiling (fluidized) bed dryer, a tray frame dryer, a rake vacuum dryer and the like which are commonly used in the industry are adopted for drying, the iron ore powder is easily adhered to the surface of the equipment contacted with the iron ore powder, when the adhered iron ore powder reaches a certain thickness, the drying of the iron ore powder and the normal flowing of the material are influenced, and the adhered material needs to be cleaned after the equipment runs for a period of time. Meanwhile, in the drying process of the iron ore powder, the average temperature difference between the flue gas and the iron ore powder is small, the heat exchange efficiency is low, and the energy consumption is large.
In the process of breaking up the dry agglomerated iron ore powder, due to the randomness of the contact between the materials and the breaking-up parts, the granularity of the broken materials is not uniform, and if agglomerated materials with the granularity larger than 1mm exist in the iron ore powder, the magnetizing roasting quality of the iron ore can be influenced. At present, common powder caking is broken up and is broken up mainly for the impact who refers to rubbing crusher smashes the principle, carries out the regrinding to the material in other words, and it is broken up inefficiency, breaks up the process energy consumption big, causes the crossing of material simultaneously easily to smash, leads to the operation effect poor, the working cost is high, and easily causes dust pollution. Due to the limitation of the structure of the equipment, the existing scattering machine has more easily-damaged parts, and meanwhile, the existing scattering machine has more limitation on the size of a lump, so that the scattering operation is difficult to realize on the large lump. Therefore, the prior art can not meet the requirements of high-quality, high-efficiency and pollution-free scattering operation of the agglomerated powder.
The utility model discloses the technical problem that will solve is: the method and the device for drying and scattering the sticky and wet powdery iron ore powder solve the problems that the existing iron ore powder is adhered to equipment in the drying process, the energy consumption is high, the granularity generated in the drying iron ore powder scattering process is uneven, the scattering efficiency is low, the scattering energy consumption is high, the dust pollution is caused and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve present iron ore powder in drying process adhesion equipment, energy resource consumption big and dry iron ore powder the granularity inequality that breaks up the in production, break up inefficiency, break up the energy consumption big, dust pollution environment scheduling problem, provide a glutinous wet iron ore powder in the drying not adhere equipment, break up the granularity even, energy resource consumption is low, environmental pollution is little, simple structure and the drying break up the device.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a sticky wet powdery iron ore powder drying and scattering device comprises a double-helix hot flue gas dryer, a material vertical scattering machine, a cyclone dust collector and a cloth bag dust collector, wherein the double-helix hot flue gas dryer is horizontal indirect drying equipment, a drying cylinder is supported by a rack, a feed inlet is formed in the upper part of one end of the drying cylinder, a discharge outlet is formed in the bottom of the other end of the drying cylinder, a hollow rotating shaft is used as a passage through which hot flue gas passes, one part of the hollow rotating shaft is arranged in the drying cylinder, one end of the two ends of the hollow rotating shaft extends out of the drying cylinder to be used as an air inlet and is communicated with a hot flue gas source pipe through a rotary joint, the other end of the hollow rotating shaft extends into an air outlet pipeline and is connected with an output shaft of a speed reduction motor, the air outlet pipeline is provided with an upward air outlet, a helical blade is fixed on the hollow rotating shaft, the inner, hot flue gas enters from the air inlet and then passes through the hollow rotating shafts, the helical blades and the air outlet pipeline, and is discharged from the air outlet, the number of the hollow rotating shafts is at least two, and the helical blades on two adjacent hollow rotating shafts are mutually crossed and rotate relatively; the bottom of the vertical material scattering machine is supported by a chassis, a driving mechanism is fixed on the chassis and connected with a transmission mechanism, the transmission mechanism drives a rotating part in a diffusion cylinder to rotate, a scattering rotary table is arranged on the rotating part of the diffusion cylinder, a scattering column is arranged on the outer circumferential surface of the scattering rotary table, the diffusion cylinder is communicated with a feeding cylinder, the lower part of the feeding cylinder surrounds an annular air inlet chamber, a caking and drying material inlet is arranged in the middle of the feeding cylinder, and a gas-solid two-phase outflow port is arranged at the top of the feeding cylinder; the discharge port is communicated with the caking and drying material inlet, the air outlet is communicated with the annular air inlet chamber, the gas-solid two-phase outflow port is communicated with the feeding port of the cyclone dust collector, the outlet at the top of the cyclone dust collector is communicated with the bag dust collector, the exhaust gas of the bag dust collector is discharged by the air exhaust fan and the chimney, and the falling powdery materials of the cyclone dust collector and the bag dust collector are collected and then used as products.
Two adjacent hollow rotating shafts are arranged in a pair-roller mode, and the helical blades of the adjacent hollow rotating shafts are mutually staggered and rotate tangentially.
The drying cylinder also comprises an insulating layer and at least one hot air chamber, the insulating layer surrounds the at least one hot air chamber, two rotating shafts with helical blades are arranged above each hot air chamber, each hot air chamber adopts a U-shaped structure, a U-shaped wall is shared between every two adjacent hot air chambers, hot smoke is supplied from one end of the U-shaped wall of each hot air chamber and is discharged from the other end of the U-shaped wall of each hot air chamber; the cooled flue gas is discharged from the upper part of the double-helix hot flue gas dryer and then is conveyed to a fluidizing gas inlet of the vertical material scattering machine through a pipeline.
The powder materials falling from the cyclone dust collector and the bag dust collector are collected and then conveyed to the next process for utilization through the screw conveyor.
The utility model has the advantages that: 1. the double-helix hot flue gas dryer and the vertical scattering machine are integrated together, so that the preheated material discharged by the double-helix hot flue gas dryer can be continuously dried and preheated in the vertical scattering machine, and meanwhile, the heat of the medium-temperature flue gas after drying and use can be continuously utilized in the vertical scattering machine, and the energy utilization efficiency is improved.
2. In the double-helix hot flue gas dryer, materials adhered to the hollow rotating shaft and the helical blades can reach the self-cleaning effect through mutual friction between the adhered materials under the action of the helical blades which are mutually crossed and relatively rotate.
3. In the vertical material scattering machine, the granularity of the materials is controlled by adopting a wind sorting method, so that the uniformity of the granularity of the scattered materials is ensured.
4. The gas-solid two-phase flow discharged from the vertical scattering machine enters the cyclone dust collector and the bag-type dust collector for material recovery, so that the utilization rate of the iron ore is improved, and the environmental pollution is reduced.
Drawings
FIG. 1 is a schematic view of a double-helix hot flue gas dryer;
FIG. 2 is a structural diagram of a main body of the double-helix hot flue gas dryer;
FIG. 3 is a sectional structure diagram of a double-helix hot flue gas dryer;
FIG. 4 is a view showing a structure of a hollow rotary shaft and a helical blade;
FIG. 5 is a schematic view of a vertical material breaker;
FIG. 6 is a schematic diagram showing the relationship between the drying and scattering equipment for sticky and wet powdered iron ore powder.
Detailed Description
A sticky and wet powdery iron ore powder drying and scattering device comprises a double-helix hot flue gas dryer 1, a material vertical scattering machine 2, a cyclone dust collector 3 and a bag dust collector 4, wherein the double-helix hot flue gas dryer is horizontal indirect drying equipment, a drying cylinder 102 is supported by a frame 101, the upper part of one end of the drying cylinder 102 is a feeding hole 103, the bottom of the other end of the drying cylinder 102 is a discharging hole 104, a hollow rotating shaft 105 is used as a passage through which hot flue gas passes, one part of the hollow rotating shaft is arranged in the drying cylinder 102, one end of the two ends of the hollow rotating shaft extends out of the drying cylinder 102 to be used as an air inlet 106 and is communicated with a hot flue gas source pipe through a rotary joint, the other end of the hollow rotating shaft 105 extends into an air outlet pipeline 110 and is connected with an output shaft of a speed reduction motor 111, the air outlet pipeline 110 is provided with an upward air outlet 107, a spiral blade 108 is, the contact positions of the hollow rotating shafts 105, the drying cylinder 102 and the air outlet pipeline are provided with shaft seals, hot smoke enters from the air inlet 106 and then passes through the hollow rotating shafts 105, the spiral blades 108 and the air outlet pipeline and is discharged from the air outlet 107, at least two hollow rotating shafts 105 are provided, and the spiral blades 108 on two adjacent hollow rotating shafts 105 are mutually crossed and relatively rotate; the bottom of the vertical material scattering machine 2 is supported by a chassis 201, a driving mechanism 202 is fixed on the chassis 201, the driving mechanism 202 is connected with a transmission mechanism 203, the transmission mechanism 203 drives a rotating part in a diffusion cylinder 204 to rotate, a scattering rotary disc is arranged on the rotating part of the diffusion cylinder 204, a scattering column is arranged on the outer circumferential surface of the scattering rotary disc, the diffusion cylinder 204 is communicated with a feeding cylinder 205, the lower part of the feeding cylinder 205 surrounds an annular air inlet chamber 206, a caking dry material inlet 207 is arranged in the middle of the feeding cylinder 205, and a gas-solid two-phase flow outlet 208 is arranged at the top of the feeding cylinder 205; the discharge hole 104 is communicated with an inlet 207 of the caking drying material, the air outlet 107 is communicated with an annular air inlet chamber 206, an outlet 208 of the gas-solid two-phase is communicated with an inlet of the cyclone dust collector 3, an outlet at the top of the cyclone dust collector 3 is communicated with the bag dust collector 4, the exhaust gas of the bag dust collector 4 is discharged through the air exhaust fan 5 and the chimney 6, and the falling powdery materials of the cyclone dust collector 3 and the bag dust collector 4 are conveyed to the next process for utilization through the spiral conveyer after being collected.
The two adjacent hollow rotating shafts 105 are arranged in a pair-roller manner, and the helical blades 108 of the adjacent hollow rotating shafts 105 are staggered and rotate tangentially.
The drying cylinder 102 further comprises an insulating layer and at least one hot air chamber 112, the insulating layer 109 surrounds the at least one hot air chamber 112, two rotating shafts with helical blades are arranged above each hot air chamber, each hot air chamber 112 adopts a U-shaped structure, a U-shaped wall is shared between every two adjacent hot air chambers, hot smoke is supplied from one end of the U-shaped wall of each hot air chamber, and is discharged from the other end of the U-shaped wall of each hot air chamber; the cooled flue gas is discharged from the upper part of the double-helix hot flue gas dryer and then is conveyed to a fluidizing gas inlet of the vertical material scattering machine through a pipeline.
And the powdery materials falling from the cyclone dust collector 3 and the bag dust collector 4 are collected and conveyed to the next process for utilization by a screw conveyor.
Implementation of drying and scattering of sticky wet powdery materials:
(1) after sticky wet powdery iron ore powder with 8-11% of water and more than 40% of granularity of-200 meshes is added from a feeding port 103 of the double-helix hot flue gas dryer, the iron ore powder absorbs heat of hot flue gas transferred from a hollow rotating shaft 105 and helical blades 108 in the process of moving from the feeding port to a discharging port 104 through the rotation action of the helical blades 108 which are mutually crossed and rotate relatively, so that the iron ore powder can be dried in the heating and temperature rising processes.
(2) After hot flue gas is introduced from an air inlet 106 of the double-helix hot flue gas dryer, the hot flue gas transfers heat to the hollow rotating shaft and the helical blades through convection and radiation heat transfer in the flowing process of the hot flue gas in the hollow rotating shaft 105 and the helical blades 108, and the hollow rotating shaft and the helical blades transfer the heat to iron ore powder.
(3) When the temperature of the iron ore powder is raised to 150-.
(4) After the dry iron ore powder is fed from a feeding hole 207 of the vertical scattering machine, the iron ore powder contacts with middle-temperature flue gas flowing from bottom to top in the falling process in a feeding cylinder, fine-grained materials in the iron ore powder are fluidized by the flue gas to form gas-solid two-phase flow and then are discharged from a gas-solid two-phase outflow port 208, and after coarse-grained materials in the iron ore powder contact with a diffusion cylinder 204 in the continuous falling process, part of bonded coarse-grained materials are scattered under the rotating scattering action of a scattering turntable and a scattering cylinder in the diffusion cylinder.
(5) After the diffusion cylinder pressurizes the medium temperature flue gas sucked from the air inlet of the annular air inlet chamber 206 in the rotating process, the medium temperature flue gas blows away the fine iron ore powder and becomes a gas-solid two-phase flow to be discharged from the gas-solid two-phase flow outlet 208 in the process of flowing from bottom to top, the coarse iron ore powder continues to be scattered under the rotating action of the scattering turntable and the scattering cylinder, and the iron ore powder can not be completely pumped away by the medium temperature flue gas until all the bonding materials are scattered.
(6) Gas-solid two-phase flow discharged from the vertical scattering machine enters a cyclone dust collector 3, dry coarse-fraction iron ore powder is separated, the primarily separated gas-solid two-phase flow enters a bag-type dust collector 4, the dry fine-fraction iron ore powder is further recovered, the dry fine-fraction iron ore powder with the temperature of 150-plus-180 ℃ is obtained and is sent to a subsequent suspension magnetization roasting device for utilization as a preheating material, and clean flue gas after dust removal is pressurized by an air exhaust fan 5 and then is discharged through a chimney 6.
Claims (4)
1. The utility model provides a device is broken up in sticky wet powdered iron ore powder drying which characterized by: comprises a double-helix hot flue gas dryer (1), a vertical material scattering machine (2), a cyclone dust collector (3) and a bag dust collector (4), wherein the double-helix hot flue gas dryer is horizontal indirect drying equipment, a drying cylinder (102) is supported by a rack (101), the upper part of one end of the drying cylinder (102) is provided with a feed inlet (103), the bottom of the other end is provided with a discharge outlet (104), a hollow rotating shaft (105) is used as a passage through which hot flue gas passes, one part of the hollow rotating shaft is arranged in the drying cylinder (102), one end of the two ends of the hollow rotating shaft extends out of the drying cylinder (102) to be used as an air inlet (106) and is communicated with a hot flue gas source pipe through a rotary joint, the other end of the hollow rotating shaft (105) extends into an air outlet pipeline (110) and is connected with an output shaft of a speed reducing motor (111), the air outlet pipeline (110), the interior of the spiral blade (108) is hollow, the inner space of the spiral blade is communicated with the interior of the hollow rotating shaft (105) in a hollow mode, the contact positions of the hollow rotating shaft (105) with the drying cylinder (102) and the air outlet pipeline are sealed by shafts, hot smoke enters from the air inlet (106) and then passes through the hollow rotating shaft (105), the spiral blade (108) and the air outlet pipeline and is discharged from the air outlet (107), at least two hollow rotating shafts (105) are arranged, and the spiral blades (108) on two adjacent hollow rotating shafts (105) are mutually crossed and relatively rotate; the bottom of the vertical material scattering machine (2) is supported by a chassis (201), a driving mechanism (202) is fixed on the chassis (201), the driving mechanism (202) is connected with a transmission mechanism (203), the transmission mechanism (203) drives a rotary part in a diffusion cylinder (204) to rotate, a scattering turntable is arranged on the rotary part of the diffusion cylinder (204), scattering columns are arranged on the outer circumferential surface of the scattering turntable, the diffusion cylinder (204) is communicated with a feeding cylinder (205), the lower part of the feeding cylinder (205) surrounds an annular air inlet chamber (206), a caking dry material inlet (207) is formed in the middle of the feeding cylinder (205), and a gas-solid two-phase outflow port (208) is formed in the top of the feeding cylinder (205); the discharge port (104) is communicated with the caking drying material inlet (207), the air outlet (107) is communicated with the annular air inlet chamber (206), the gas-solid two-phase outflow port (208) is communicated with the feeding port of the cyclone dust collector (3), the outlet at the top of the cyclone dust collector (3) is communicated with the bag dust collector (4), the exhaust gas of the bag dust collector (4) is discharged through the air exhaust fan (5) and the chimney (6), and the falling powdery materials of the cyclone dust collector (3) and the bag dust collector (4) are collected and then used as products.
2. The drying and scattering device for sticky and wet powdered iron ore powder as claimed in claim 1, wherein: two adjacent hollow rotating shafts (105) are arranged in a pair-roller mode, and the helical blades (108) of the adjacent hollow rotating shafts (105) are mutually staggered and rotate tangentially.
3. The drying and scattering device for sticky and wet powdered iron ore powder as claimed in claim 1, wherein: the drying cylinder (102) further comprises an insulating layer and at least one hot air chamber (112), the insulating layer (109) surrounds the at least one hot air chamber (112), two rotating shafts with helical blades are arranged above each hot air chamber, each hot air chamber (112) is of a U-shaped structure, a U-shaped wall is shared between every two adjacent hot air chambers, hot smoke is supplied from one end of the U-shaped wall of each hot air chamber and is exhausted from the other end of the U-shaped wall of each hot air chamber; the cooled flue gas is discharged from the upper part of the double-helix hot flue gas dryer and then is conveyed to a fluidizing gas inlet of the vertical material scattering machine through a pipeline.
4. The drying and scattering device for sticky and wet powdered iron ore powder as claimed in claim 1, wherein: the powder materials falling from the cyclone dust collector (3) and the bag dust collector (4) are collected and then conveyed to the next process for utilization by a screw conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821761429.2U CN209857606U (en) | 2018-10-29 | 2018-10-29 | Sticky wet powdery iron ore powder drying and scattering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821761429.2U CN209857606U (en) | 2018-10-29 | 2018-10-29 | Sticky wet powdery iron ore powder drying and scattering device |
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| Publication Number | Publication Date |
|---|---|
| CN209857606U true CN209857606U (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821761429.2U Expired - Fee Related CN209857606U (en) | 2018-10-29 | 2018-10-29 | Sticky wet powdery iron ore powder drying and scattering device |
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| CN (1) | CN209857606U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325622A (en) * | 2020-11-05 | 2021-02-05 | 陈开琴 | Drying equipment with three-dimensional floating function and implementation method thereof |
-
2018
- 2018-10-29 CN CN201821761429.2U patent/CN209857606U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325622A (en) * | 2020-11-05 | 2021-02-05 | 陈开琴 | Drying equipment with three-dimensional floating function and implementation method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191227 Termination date: 20201029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |