CN114392662A - Solid waste mixing device and zinc-containing solid waste treatment method - Google Patents
Solid waste mixing device and zinc-containing solid waste treatment method Download PDFInfo
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- CN114392662A CN114392662A CN202210214893.4A CN202210214893A CN114392662A CN 114392662 A CN114392662 A CN 114392662A CN 202210214893 A CN202210214893 A CN 202210214893A CN 114392662 A CN114392662 A CN 114392662A
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- 238000002156 mixing Methods 0.000 title claims abstract description 150
- 239000002910 solid waste Substances 0.000 title claims abstract description 54
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000011701 zinc Substances 0.000 title claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 22
- 238000009270 solid waste treatment Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 102
- 238000003756 stirring Methods 0.000 claims abstract description 73
- 239000000428 dust Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 24
- 239000010802 sludge Substances 0.000 claims description 45
- 238000007790 scraping Methods 0.000 claims description 33
- 230000005540 biological transmission Effects 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 239000002956 ash Substances 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000005453 pelletization Methods 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract 2
- 238000004519 manufacturing process Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention provides a solid waste mixing device and a zinc-containing solid waste treatment method. The solid waste mixing device comprises: the upper part of the mixing bin is provided with a first feed inlet, a second feed inlet and a circulating feed inlet, and the lower part of the mixing bin is provided with a discharge outlet and a circulating discharge outlet; the first stirring assembly is arranged in the mixing bin; the discharge end of the dry material mixing bin is communicated with the first feed inlet; the second stirring component is arranged in the dry material mixing bin; the discharge end of the wet material mixing bin is communicated with the second feed inlet; the third stirring assembly is arranged in the wet material mixing bin; and the circulating conveying assembly is provided with an inflow end communicated with the circulating discharge hole and an outflow end communicated with the circulating feed hole. The dry material mixing bin is located to the second stirring subassembly, can mix together the solid useless of multiple dust, and wet material mixing bin is located to the third stirring subassembly, can mix together the solid useless of multiple mud, and the dust and the mud that mix the completion get into the blending bunker and carry out final mixing, have both simplified process flow, can guarantee again that the raw materials misce bene, mix effectually.
Description
Technical Field
The invention belongs to the technical field of steel solid waste treatment, and particularly relates to a solid waste mixing device and a zinc-containing solid waste treatment method.
Background
Solid wastes such as various dusts and sludge, which are called solid wastes for short, are inevitably generated in the production process of iron and steel enterprises. The solid waste generated in the steel production contains harmful elements such as zinc and the like besides iron, the proportion of the generated zinc-containing solid waste is gradually increased along with factors such as the increase of the steel-making input proportion of a short-flow electric furnace, the change of the ratio of raw materials to scrap steel and the like, and the part of solid waste belongs to dangerous waste and needs to be treated in a compliance manner.
The existing zinc-containing solid waste treatment modes generally comprise two modes, one mode is that solid waste is collected and returned to a batching procedure to participate in production again, but zinc elements in the solid waste still remain in sinter, so that the production quality of the sinter is reduced, and blast furnace equipment is damaged to a certain extent. The other method is to recover zinc element by using a pyrogenic process, wherein the solid waste is subjected to reduction dezincification by using a rotary kiln process, the raw materials are required to be mixed and granulated to be made into pellets before the solid waste is put into the rotary kiln, the problems of dust overflow, uneven mixing and complicated operation flow are easily caused when the raw materials are mixed in the prior art, and more auxiliary materials such as water and a binder are required to be added during granulation to ensure the solid waste forming, so that the treatment cost is increased.
Disclosure of Invention
The invention provides a solid waste mixing device and a zinc-containing solid waste treatment method, and aims to solve the problems that in the prior art, dust overflow, uneven mixing and complicated operation flow are easily generated when raw materials are mixed, and meanwhile, more auxiliary materials such as water and a binder are required to be added for ensuring solid waste forming, so that the treatment cost is increased.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the present invention provides a solid waste mixing device comprising: the upper part of the mixing bin is provided with a first feed inlet, a second feed inlet and a circulating feed inlet, and the lower part of the mixing bin is provided with a discharge outlet and a circulating discharge outlet; the first stirring assembly is arranged in the mixing bin; the discharge end of the dry material mixing bin is communicated with the first feed inlet; the second stirring component is arranged in the dry material mixing bin; the discharge end of the wet material mixing bin is communicated with the second feed inlet; the third stirring assembly is arranged in the wet material mixing bin; and the circulating conveying assembly is provided with an inflow end communicated with the circulating discharge hole and an outflow end communicated with the circulating feed hole.
In a possible implementation manner, the first feeding hole, the second feeding hole and the circular discharging hole are provided with switch valves.
In one possible implementation, the first stirring assembly includes: the first rotating shaft is rotatably arranged in the mixing bin along the direction from top to bottom; the plurality of first rod groups are arranged on the first rotating shaft at intervals along the axial direction of the first rotating shaft; the mud scraping frame is rotatably arranged in the mixing bin, the mud scraping frame is attached to the inner wall of the mixing bin, and at least part of the first rod set is accommodated in the frame space of the mud scraping frame; and the first driver is arranged on the mixing bin and used for driving the first rotating shaft and the mud scraping frame to rotate.
In one possible implementation manner, the first rod group includes a plurality of first stirring rods arranged around the first rotating shaft, and one end of each first stirring rod far away from the first rotating shaft is higher than one end of each first stirring rod close to the first rotating shaft.
In a possible implementation manner, the mud scraping frame comprises a plurality of second stirring rods extending into a frame space of the mud scraping frame, the second stirring rods and the first rod groups are arranged at intervals in the axial direction of the first rotating shaft, and the first driver drives the first rotating shaft and the mud scraping frame to rotate reversely through a transmission unit.
In one possible implementation, the first driver is connected to the first rotating shaft, and the transmission unit is a planetary gear set including: a sun gear coaxially connected with the first rotating shaft; the gear ring is coaxially arranged outside the sun gear and is connected with the mud scraping frame; and a plurality of planet gears, each planet gear meshing with the sun gear and the ring gear.
In one possible implementation, the third stirring assembly includes: the second rotating shaft is rotatably arranged in the wet material mixing bin along the direction from top to bottom, and the second rotating shaft sequentially forms a feeding part and a mixing part in the direction far away from the second feeding hole; a helical blade provided in the feeding section; a plurality of second rod groups which are arranged at intervals in the axial direction of the second rotating shaft in the mixing part; and the second driver is arranged in the wet material mixing bin and used for driving the second rotating shaft to rotate.
In one possible implementation manner, the solid waste mixing device further includes a feeding assembly, and the feeding assembly includes: the two material stirring wheels are oppositely arranged and are positioned in the mixing bin and close to the circular discharge hole, so that the material positioned between the two material stirring wheels is conveyed to the circular discharge hole in the rotating process; and the third driver is arranged on the mixing bin and used for driving the two material stirring wheels to rotate reversely.
The solid waste mixing device provided by the invention has a compact integral structure, the second stirring component is arranged in the dry material mixing bin and can mix various kinds of dust and solid waste together, the third stirring component is arranged in the wet material mixing bin and can mix various kinds of sludge and solid waste together, the mixed dust and sludge and solid waste enter the mixing bin and are finally mixed under the action of the first stirring component, the process flow is simplified, the raw materials can be uniformly mixed, and the mixing effect is good.
The invention directly mixes the dust solid waste and the sludge solid waste together, utilizes the characteristics of dry and wet materials, the dust can be aggregated into a cluster after absorbing the moisture in the sludge, the fluidity of the sludge is reduced after the moisture in the sludge is absorbed, the forming is easy, the addition of auxiliary materials such as adhesive and water in the mixing process can be greatly reduced or even eliminated, and the cost is saved.
According to the invention, the circulating conveying assembly is arranged, so that the materials at the bottom of the mixing bin can be lifted to the upper part of the mixing bin, the materials are turned in the total mixing bin, and the materials in the mixing bin are uniformly mixed. The mixed materials have uniform components and moisture content, thereby being beneficial to improving the quality of the subsequent granulation process and shortening the material mixing time.
In a second aspect, the invention provides a zinc-containing solid waste treatment method, which comprises the following steps: collecting dust and sludge in a steel mill; mixing the dust, the reducing agent and the sludge by using the solid waste mixing device in any one of the above implementation modes; wherein, dust and reductant are carried to in the dry material mixing storehouse, and mud is carried to in the wet material mixing storehouse, and the ratio of dust and mud is 80-92%: 8-20%, and the addition amount of the reducing agent accounts for 10% -30% of the dust sludge mixed material; conveying the mixed materials to a granulator for granulation; conveying the granulated material to a rotary kiln for dezincification, and controlling the temperature of a high-temperature zone of the rotary kiln between 1050 and 1180 ℃; and collecting zinc-containing substances in the smoke generated when the rotary kiln operates for recycling, purifying the smoke and then discharging, and discharging kiln slag from the rotary kiln and allowing the kiln slag to enter a cooling pool for cooling and recycling.
In one possible implementation, the dust includes one or more of yard fly ash, pelletizing process ash, blast furnace environment ash, blast furnace gas ash, converter fly ash, and electric furnace fly ash, the sludge includes one or more of blast furnace gas sludge and converter OG sludge, and the reducing agent includes one or more of coke powder, CDQ powder, and coal powder.
The zinc-containing solid waste treatment method provided by the invention directly mixes the dust solid waste and the sludge solid waste together, thereby simplifying the process flow. By utilizing the characteristics of dry and wet materials, the dust can be gathered into a cluster after absorbing the moisture in the sludge, the mobility of the absorbed moisture in the sludge is reduced, the forming is easy, the adding amount of auxiliary materials such as a binder and water in the mixing process can be greatly reduced or even eliminated, and the cost is saved.
Drawings
FIG. 1 is a schematic structural diagram of a solid waste mixing device according to an embodiment of the present invention;
FIG. 2 is a schematic view of an internal structure of a solid waste mixing device according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic structural diagram of a first stirring assembly according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a transmission unit according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a third stirring assembly according to an embodiment of the present invention;
fig. 7 is a process diagram of a zinc-containing solid waste treatment method according to an embodiment of the present invention.
Description of reference numerals:
1. solid waste mixing device
10. Mixing bunker 11, first feed inlet 12, second feed inlet
13. Circulation feed inlet 14, circulation discharge outlet 15, ooff valve
20. First stirring component 21, first rotating shaft 22 and first rod set
221. First stirring rod 23, mud scraping frame 231 and second stirring rod
24. First drive 25, transmission unit 251, sun gear
252. Gear ring 253, planet wheel 30 and dry material mixing bin
40. Second stirring component 50, wet material mixing bin 60 and third stirring component
61. Second rotating shaft 62, helical blade 63 and second rod set
64. Second driver 70, circulating conveying assembly 80 and feeding assembly
81. Kick-off wheel 82, third driver
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to," "secured to," or "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "in communication" it can be directly in communication with the other element via a passageway, or indirectly in communication with the other element via other elements, lines, valves, etc. When an element is referred to as being "disposed on," "disposed on" another element, it can be directly on the other element or intervening elements may also be present. "plurality" means two or more.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1 to 7, a solid waste mixing device 1 and a zinc-containing solid waste treatment method according to an embodiment of the present invention will be described.
Referring to fig. 1 and fig. 2, in a first aspect, an embodiment of the present invention provides a solid waste mixing device 1, including: the upper part of the mixing bin 10 is provided with a first feed inlet 11, a second feed inlet 12 and a circulating feed inlet 13, and the lower part of the mixing bin is provided with a discharge hole and a circulating discharge hole 14; the first stirring assembly 20 is arranged in the mixing bin 10; a dry material mixing bin 30, the discharge end of which is communicated with the first feed inlet 11; the second stirring component 40 is arranged in the dry material mixing bin 30; a wet material mixing bin 50, wherein the discharge end is communicated with the second feed inlet 12; the third stirring assembly 60 is arranged in the wet material mixing bin 50; and a circulation conveyance assembly 70 having an inflow end communicating with the circulation discharge port 14, and an outflow end communicating with the circulation feed port 13.
The solid waste mixing device 1 provided by the embodiment of the invention has a compact integral structure, the second stirring component 40 is arranged in the dry material mixing bin 30 and can mix various kinds of dust and solid waste together, the third stirring component 60 is arranged in the wet material mixing bin 50 and can mix various kinds of sludge and solid waste together, the mixed dust and solid waste and sludge and solid waste enter the mixing bin 10 and are finally mixed under the action of the first stirring component 20, so that the process flow is simplified, the raw materials can be uniformly mixed, and the mixing effect is good. The mixed material can be discharged from the discharge opening.
The dry material mixing bin 30 is used for mixing material yard fly ash, pellet process ash, blast furnace environment ash, blast furnace gas ash, converter fly ash, electric furnace fly ash, reducing agent and the like, each dry material is conveyed to an independent storage tank through a conveying device from a production site independently, the adding proportion of various dry materials can be adjusted by adjusting the feeding speed, and each storage tank is connected to the dry material mixing bin 30 through a pipeline for stirring. Considering that the dust is easy to absorb water and agglomerate after being stored for a long time, the second stirring assembly 40 can break and uniformly stir the water-absorbed and agglomerated dust during the rotation process. Wet materials such as blast furnace gas mud and converter OG mud in a steel mill are conveyed into the wet material mixing bin 50 through respective pipelines, the adding proportion of various wet materials can be adjusted by adjusting the feeding speed, and the wet materials are uniformly stirred by the third stirring assembly 60.
It should be noted that the first stirring assembly 20, the second stirring assembly 40, and the third stirring assembly 60 are all used for stirring materials, and the specific structure thereof may be a rod type, a blade type, a screw type, and the like, and the embodiment of the present invention is not limited thereto.
It should be noted that, in order to prevent dust from escaping and sludge from splashing during the stirring process, the mixing silo 10, the dry material mixing silo 30 and the wet material mixing silo 50 may be set as closed shells, and are connected with other devices or apparatuses only through necessary pipes or interfaces to achieve material entry and exit, which is more environment-friendly. Referring to fig. 1, in one embodiment, the mixing silo 10, the dry material mixing silo 30 and the wet material mixing silo 50 are all in the form of tapered hoppers with wide top and narrow bottom.
When the embodiment of the invention is used, the dust solid waste and the sludge solid waste are directly mixed together, the dust is gathered into a cluster after absorbing the moisture in the sludge by utilizing the characteristics of the dry material and the wet material, the fluidity of the sludge is reduced after being absorbed, the forming is easy, the addition amount of auxiliary materials such as a binder and water in the mixing process can be greatly reduced or even eliminated, and the cost is saved.
According to the embodiment of the invention, the circulating conveying assembly 70 is arranged, so that the material at the bottom of the mixing bin 10 can be lifted to the upper part of the mixing bin 10, the material can be turned over in the mixing bin 10, and the material in the mixing bin 10 can be uniformly mixed. The mixed materials have uniform components and moisture content, thereby being beneficial to improving the quality of the subsequent granulation process and shortening the material mixing time. Specifically, the endless conveying member 70 may be a screw conveyor, a bucket elevator, or the like.
Referring to fig. 1 and 2, in some possible embodiments, the first inlet 11, the second inlet 12 and the recycling outlet 14 are provided with an on-off valve 15, and the on-off valve 15 may be a solenoid valve, a ball valve, a butterfly valve, or the like.
When using, the ooff valve 15 of first feed inlet 11 and the ooff valve 15 of second feed inlet 12 are opened and are closed in turn, make mud and dust multilayer pile up through the mode of intermittent type blanking in turn and realize preliminary mixing, can shorten material mixing time, combine the stirring messenger of first stirring subassembly 20 to mix more fully to can avoid the dust at stirring in-process loss.
When the on-off valve 15 of the circulation outlet 14 is opened, the materials in the mixing bin 10 can enter the circulation conveying assembly 70 and are conveyed to the circulation inlet 13 by the circulation conveying assembly 70.
Referring to fig. 2 and 4, in some possible embodiments, the first stirring assembly 20 includes: the first rotating shaft 21 is rotatably arranged in the mixing bin 10 along the direction from top to bottom; a plurality of first rod groups 22 provided at the first rotating shaft 21 at intervals in the axial direction of the first rotating shaft 21; the mud scraping frame 23 is rotatably arranged in the mixing bin 10, the mud scraping frame 23 is attached to the inner wall of the mixing bin 10, and at least part of the first rod group 22 is accommodated in the frame space of the mud scraping frame 23; and a first driver 24 arranged on the mixing bin 10 and used for driving the first rotating shaft 21 and the mud scraping frame 23 to rotate.
In this embodiment, the sludge adhered to the inner wall of the material mixing bin 10 can be scraped off when the sludge scraping frame 23 rotates, so as to ensure that no material is left on the inner wall of the material mixing bin 10, the first rotating shaft 21 and the first rod group 22 can uniformly stir the material in the material mixing bin 10 when rotating, and the first driver 24 is used for driving the sludge scraping frame 23 and the first rotating shaft 21 to rotate. Specifically, the first driver 24 may be a motor, and is in transmission connection with the first rotating shaft 21 and the mud scraping frame 23 through a gear set, a pulley, and the like.
Referring to fig. 2 and 4, in some possible embodiments, the mixing silo 10 is in the form of a tapered hopper with a wide top and a narrow bottom, and the mud scraping frame 23 includes an upper boundary beam, a lower boundary beam, and two side beams connecting the upper boundary beam and the lower boundary beam, which together enclose a frame-shaped structure with a wide top and a narrow bottom, and the two side beams are attached to the inner wall of the mixing silo 10. Because the blending bunker 10 is the toper, even if the internal diameter size of blending bunker 10 fluctuates because of manufacturing tolerance, also can guarantee to scrape the inner wall that can laminate in blending bunker 10 after mud frame 23 installs, reduced the requirement to manufacturing accuracy, low in manufacturing cost can also guarantee to scrape mud frame 23 simultaneously and scrape mud respond well.
Referring to fig. 2 and 4, in some possible embodiments, the first rod set 22 includes a plurality of first stirring rods 221 disposed around the first rotating shaft 21, and an end of the first stirring rod 221 away from the first rotating shaft 21 is higher than an end of the first stirring rod adjacent to the first rotating shaft 21. First puddler 221 slope sets up in this embodiment, and the stirring scope when can increase the rotation makes the stirring more abundant, and is specific, and the inclination angle scope of first puddler 221 and horizontal plane is 15 ~ 30.
Referring to fig. 2 and 4, in some possible embodiments, the mud scraping frame 23 includes a plurality of second stirring rods 231 extending into the frame space of the mud scraping frame 23, the plurality of second stirring rods 231 and the plurality of first rod sets 22 are spaced apart from each other in the axial direction of the first rotating shaft 21, and the first driver 24 drives the first rotating shaft 21 and the mud scraping frame 23 to rotate in opposite directions through the transmission unit 25.
Be equipped with second puddler 231 on the mud scraping frame 23 in this embodiment for mud scraping frame 23 can play the effect of scraping mud and stirring simultaneously when rotating, and first puddler 221 and second puddler 231 during operation are rotatory to opposite direction simultaneously, can provide the shearing force to the material in the blending bunker 10, make the stirring more abundant, shorten the churning time.
Referring to fig. 4 and 5, in some possible embodiments, the first driver 24 is connected to the first rotating shaft 21, and the transmission unit 25 is a planetary gear set including: a sun gear 251 coaxially connected to the first rotating shaft 21; the gear ring 252 is coaxially arranged outside the sun gear 251 and is connected with the mud scraping frame 23; and a plurality of planet gears 253, each planet gear 253 meshing with the sun gear 251 and the ring gear 252.
In this embodiment, the first driver 24 may be a power mechanism capable of providing a rotation motion, such as a motor, and a planetary gear set is used as the transmission unit 25, so that the sun gear 251 and the ring gear 252 can rotate in opposite directions under the driving of the motor, and the overall structure is compact and the maintenance is convenient.
Of course, besides the above structure, the mud scraping frame 23 and the first rotating shaft 21 may also adopt a transmission form such as gear transmission, belt transmission, etc.
Referring to fig. 2 and 6, in some possible embodiments, the third stirring assembly 60 includes: the second rotating shaft 61 is rotatably arranged in the wet material mixing bin 50 along the direction from top to bottom, and the feeding part and the mixing part are sequentially formed on the second rotating shaft 61 in the direction away from the second feeding hole 12; a helical blade 62 provided in the feeding section; a plurality of second rod groups 63 provided at intervals in the mixing section in the axial direction of the second rotating shaft 61; and a second driver 64, which is arranged in the wet material mixing bin 50 and is used for driving the second rotating shaft 61 to rotate.
In the embodiment, the position of the second rotating shaft 61 adjacent to the second feeding hole 12 is a feeding portion, the position far away from the second feeding hole 12 is a mixing portion, the mixing portion is provided with the second rod set 63 which can play a role in stirring sludge, and the feeding portion is provided with the helical blade 62 which can play a role in conveying sludge, so that the second feeding hole 12 is prevented from being blocked by sludge.
Referring to fig. 2 and 3, in some possible embodiments, the solid waste mixing device 1 further includes a feeding assembly 80, and the feeding assembly 80 includes: two material stirring wheels 81 which are arranged oppositely and are positioned in the mixing bin 10 and are close to the circular discharge hole 14, so that the materials positioned between the two material stirring wheels 81 are conveyed to the circular discharge hole 14 during the rotation process; and a third driver 82 arranged on the mixing bin 10 and used for driving the two material stirring wheels 81 to rotate reversely.
In consideration of the reduction of the water content and the poor flowability of the mixed material of the dust and sludge, the feeding assembly 80 for forcibly feeding the circulating and conveying assembly 70 is arranged in the mixing bin 10. Specifically, the kick-off wheel 81 is provided with a plurality of paddles along the circumferential direction, the third driver 82 drives the kick-off wheel 81 to rotate, the paddles can be used for sending the material to the circular discharge hole 14 in the rotating process of the kick-off wheel 81, and the third driver 82 can be specifically a motor.
In a second aspect, as shown in fig. 7, an embodiment of the present invention provides a method for treating zinc-containing solid waste, including the following steps:
and collecting dust and sludge in the steel mill.
Mixing the dust, the reducing agent and the sludge by using the solid waste mixing device 1 in any one of the above embodiments; wherein, dust and reducing agent are conveyed to the dry material mixing bin 30, sludge is conveyed to the wet material mixing bin 50, and the proportion of dust and sludge is 80-92%: 8-20 percent of the total weight of the powder-sludge mixture, and the addition amount of the reducing agent accounts for 10-30 percent of the total weight of the powder-sludge mixture.
And conveying the mixed material to a granulator for granulation.
And conveying the granulated material to a rotary kiln for dezincification, and controlling the temperature of a high-temperature zone of the rotary kiln between 1050 and 1180 ℃. And
collecting zinc-containing substances in smoke generated during operation of the rotary kiln for recycling, purifying the smoke and then discharging, and discharging kiln slag from the rotary kiln and allowing the kiln slag to enter a cooling pool for cooling and recycling.
In the operation of the embodiment of the invention, a binder can be added into the mixed material for granulation and forming. And (3) conveying the materials after granulation to a rotary kiln for dezincification treatment, collecting and recycling zinc-containing substances in the smoke of the rotary kiln, and cooling the iron-rich kiln slag in a cooling tank for recycling.
The zinc-containing solid waste treatment method provided by the embodiment of the invention directly mixes the dust solid waste and the sludge solid waste together, thereby simplifying the process flow. By utilizing the characteristics of dry and wet materials, the dust can be gathered into a cluster after absorbing the moisture in the sludge, the mobility of the absorbed moisture in the sludge is reduced, the forming is easy, the adding amount of auxiliary materials such as a binder and water in the mixing process can be greatly reduced or even eliminated, and the cost is saved.
In some possible embodiments, the dust comprises one or more of yard fly ash, pelletizing process ash, blast furnace environment ash, blast furnace gas ash, converter fly ash, electric furnace fly ash, the sludge comprises one or more of blast furnace gas sludge, converter OG sludge, and the reductant comprises one or more of coke powder, CDQ powder, and coal powder.
It is to be understood that, in the foregoing embodiments, various parts may be freely combined or deleted to form different combination embodiments, and details of each combination embodiment are not described herein again, and after this description, it can be considered that each combination embodiment has been described in the present specification, and can support different combination embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Gu useless mixing arrangement, its characterized in that includes:
the upper part of the mixing bin is provided with a first feed inlet, a second feed inlet and a circulating feed inlet, and the lower part of the mixing bin is provided with a discharge outlet and a circulating discharge outlet;
the first stirring assembly is arranged in the mixing bin;
the discharge end of the dry material mixing bin is communicated with the first feed inlet;
the second stirring component is arranged in the dry material mixing bin;
the discharge end of the wet material mixing bin is communicated with the second feed inlet;
the third stirring assembly is arranged in the wet material mixing bin; and
and the circulating conveying assembly is provided with an inflow end communicated with the circulating discharge hole and an outflow end communicated with the circulating feed hole.
2. The solid waste mixing device of claim 1, wherein the first feed port, the second feed port and the recycling discharge port are provided with on-off valves.
3. The solid waste mixing device of claim 1, wherein the first agitation assembly comprises:
the first rotating shaft is rotatably arranged in the mixing bin along the direction from top to bottom;
the plurality of first rod groups are arranged on the first rotating shaft at intervals along the axial direction of the first rotating shaft;
the mud scraping frame is rotatably arranged in the mixing bin, the mud scraping frame is attached to the inner wall of the mixing bin, and at least part of the first rod set is accommodated in the frame space of the mud scraping frame; and
the first driver is arranged on the mixing bin and used for driving the first rotating shaft and the mud scraping frame to rotate.
4. The solid waste mixing device of claim 3, wherein the first rod set comprises a plurality of first stirring rods disposed around the first rotating shaft, and an end of the first stirring rod remote from the first rotating shaft is higher than an end of the first stirring rod adjacent to the first rotating shaft.
5. The solid waste mixing device as claimed in claim 3, wherein the scraping frame includes a plurality of second stirring rods extending into the frame space of the scraping frame, the plurality of second stirring rods and the plurality of first rod sets are spaced in the axial direction of the first rotating shaft, and the first driver drives the first rotating shaft and the scraping frame to rotate in opposite directions through a transmission unit.
6. The solid waste mixing device of claim 5, wherein the first driver is connected with the first rotating shaft, the transmission unit is a planetary gear set, and the planetary gear set comprises:
a sun gear coaxially connected with the first rotating shaft;
the gear ring is coaxially arranged outside the sun gear and is connected with the mud scraping frame; and
a plurality of planet gears, each planet gear meshing with the sun gear and the ring gear.
7. The solid waste mixing device of claim 1, wherein the third agitating assembly comprises:
the second rotating shaft is rotatably arranged in the wet material mixing bin along the direction from top to bottom, and the second rotating shaft sequentially forms a feeding part and a mixing part in the direction far away from the second feeding hole;
a helical blade provided in the feeding section;
a plurality of second rod groups which are arranged at intervals in the axial direction of the second rotating shaft in the mixing part; and
and the second driver is arranged in the wet material mixing bin and used for driving the second rotating shaft to rotate.
8. The solid waste mixing device of claim 1, further comprising a feeding assembly, the feeding assembly comprising:
the two material stirring wheels are oppositely arranged and are positioned in the mixing bin and close to the circular discharge hole, so that the material positioned between the two material stirring wheels is conveyed to the circular discharge hole in the rotating process; and
and the third driver is arranged on the mixing bin and used for driving the two material stirring wheels to rotate reversely.
9. The zinc-containing solid waste treatment method is characterized by comprising the following steps:
collecting dust and sludge in a steel mill;
mixing together dust, reductant and sludge using a solid waste mixing device as defined in any one of claims 1 to 8; wherein, dust and reductant are carried to in the dry material mixing storehouse, and mud is carried to in the wet material mixing storehouse, and the ratio of dust and mud is 80-92%: 8-20%, and the addition amount of the reducing agent accounts for 10% -30% of the dust sludge mixed material;
conveying the mixed materials to a granulator for granulation;
conveying the granulated material to a rotary kiln for dezincification, and controlling the temperature of a high-temperature zone of the rotary kiln between 1050 and 1180 ℃; and
collecting zinc-containing substances in smoke generated during operation of the rotary kiln for recycling, purifying the smoke and then discharging, and discharging kiln slag from the rotary kiln and allowing the kiln slag to enter a cooling pool for cooling and recycling.
10. The method for treating the zinc-containing solid waste according to claim 9, wherein the dust comprises one or more of yard fly ash, pelletizing process ash, blast furnace environment ash, blast furnace gas ash, converter fly ash and electric furnace fly ash, the sludge comprises one or more of blast furnace gas mud and converter OG mud, and the reducing agent comprises one or more of coke powder, CDQ powder and coal powder.
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Application publication date: 20220426 |