CN111346567A - Method and device for treating raw material dust of sintering machine - Google Patents
Method and device for treating raw material dust of sintering machine Download PDFInfo
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- CN111346567A CN111346567A CN202010214595.6A CN202010214595A CN111346567A CN 111346567 A CN111346567 A CN 111346567A CN 202010214595 A CN202010214595 A CN 202010214595A CN 111346567 A CN111346567 A CN 111346567A
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- belt
- dust
- raw materials
- sintering machine
- flux powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/181—Preventing generation of dust or dirt; Sieves; Filters
- B01F35/184—Preventing generation of dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71705—Feed mechanisms characterised by the means for feeding the components to the mixer using belts
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for treating raw material dust of a sintering machine, which comprises the following steps: the raw materials are transported by a transport belt, and the raw materials are grooved in the transport process; putting the flux powder into the groove; firstly, flatly covering one side of the groove to wrap the raw material on one side of the flux powder; adding water into the mixture for preheating in advance; the other side of the groove is covered and leveled, so that the raw materials completely wrap the flux powder; the mixture is put into a mixer, and the raw materials wrap the flux powder, so that dust is not easy to fly in the falling process. Can avoid dust emission, and has the characteristics of environmental protection, reduction of industrial pollution and the like.
Description
Technical Field
The invention relates to the technical field of environment-friendly processes of sintering machines, in particular to a method and a device for treating raw material dust of a sintering machine.
Background
The dust at the inlet of a sintering machine mixer in the iron-making industry adopts negative pressure adsorption dust removal to remove the dust caused by the conveying of the flux powder in the mixer. Because the last in the feeding sequence of the sintering raw material proportioning bins is the flux bin, the flux powder finally falls on the belt, namely the surface layer of the material.
The prior art has the defects that: when the material moves to the blendor (the drop is about 2 meters), because the small, light weight of flux powder granularity causes the raise dust easily during whereabouts, mixes quick-witted dust pelletizing system load increase, and the flux powder meets water and can take place chemical reaction, and the dust removal pipe is very easily taken place to block up, and then influences on-the-spot dust removal effect, causes the raise dust to exceed standard, influences the environmental protection.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a device for treating the raw material dust of the sintering machine, which can avoid the occurrence of dust, and have the characteristics of environmental protection, reduction of industrial pollution and the like.
The technical purpose of the invention is realized by the following technical scheme: a method for treating the dust generated by sintering machine includes the following steps:
s1: grooving the raw material, wherein the raw material is conveyed by a conveying belt, and grooving is carried out on the raw material in the conveying process to form a groove;
s2: adding the flux powder into the groove;
s3: first mixing, namely, flatly covering one side of the groove to enable the raw material to wrap one side of the flux powder;
s4: adding water into the mixture,when water is added into the mixture, the calcium oxide in the flux powder can generate chemical reaction when meeting water () to generate heat, and the chemical equation is as follows: 2CaO + H2O＝2Ca(OH)2The materials can be preheated in advance;
s5: mixing materials for the second time, and then flatly covering the other side of the groove to enable the raw materials to completely wrap the flux powder;
s6: and (4) entering a mixer, putting the mixture into the mixer, and enabling the raw materials to wrap the flux powder, so that dust is not easy to fly in the falling process.
The invention also provides a device for treating the raw material dust of the sintering machine, which takes the conveying direction of the conveying belt as the reference of the front position and the rear position and specifically comprises the following components:
the slotting component is erected on the conveying belt and is opposite to the conveying direction of the conveying belt;
the blanking assembly is positioned at the rear end of the slotting assembly, and a blanking point of the blanking assembly is positioned right above the conveying belt;
the material mixing component is positioned behind the blanking component and provided with a leveling plate, and the mixed material can be automatically leveled when passing through.
In one embodiment, the slotting component comprises a material distributing plate which is triangular, one vertex angle of the material distributing plate faces the conveying direction of the conveying belt, a slot is formed in the middle of the mixed material through the vertex angle, and the material distributing plate is movably connected to the support.
In one embodiment, the support is 7-shaped, one end of the support is fixed on a door-shaped stand frame I, the stand frame I spans two ends of the conveying belt, and the other end of the stand frame I is downwards inclined to be connected with the material distributing plate.
In one embodiment, a supporting rod extends from one end of the support connected with the first vertical frame, the supporting rod is connected with a guide plate, and the guide plate is fixed on the first vertical frame to prevent the support from shifting.
In one embodiment, the blanking assembly comprises a storage bin for storing materials, a discharge hopper is arranged at the bottom of the storage bin, an electronic scale belt is arranged right below the discharge hopper, the electronic scale belt moves towards the direction of the conveying belt, and the tail end of the electronic scale belt is located right above the conveying belt.
In one embodiment, the discharge hopper is in a funnel shape with a wide top and a narrow bottom, the upper end of the discharge hopper is provided with an opening and is fixed at the bottom of the storage bin, and the lower end of the discharge hopper is provided with an opening and is positioned right above a belt of an electronic scale; the upper end of the discharge hopper is in a round table shape, the lower end of the discharge hopper is in a cylindrical shape, and the diameter of the discharge hopper is smaller than the width of the belt of the electronic scale.
In one embodiment, the belt of the electronic scale comprises two belt pulleys, wherein one belt pulley is in power connection with a power mechanism; a belt is wound between the belt pulleys.
In one embodiment, the material mixing assembly comprises a leveling plate, the leveling plate is close to the conveying belt, the leveling plate is rectangular, the bottom surface of the leveling plate is kept horizontal, and the leveling plate is fixed on a second portal-shaped vertical frame through a connecting frame.
In one embodiment, the device comprises two leveling plates which are respectively arranged at the front end and the rear end of the conveying belt and are inclined in opposite directions, and a water adding device is arranged between the two leveling plates.
In conclusion, the invention has the following beneficial effects:
(1) the raw materials are grooved, the flux powder is put into the grooves, and then the raw materials are covered on the flux powder, so that the problem of dust emission of the flux powder is effectively avoided in a physical covering mode, and the production environment is protected;
(2) the material dust caused by site limitation can be avoided, and the problem of dust at the inlet of the mixer is solved;
(3) the load of a dust removal system of the mixer can be effectively reduced, the negative pressure dust removal air quantity is saved, the equipment investment is reduced, and the stability and the service life of the dust removal system are greatly improved;
(4) the effect of preheating the materials can be achieved by adding water to the materials in advance.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic structural diagram of a device for controlling the dust generated from the sintering machine raw material according to the present invention;
FIG. 3 is a schematic structural view of a slotted assembly;
fig. 4 is a schematic view of the connection relationship of the material distributing plates.
In the figure: 1-slotting component, 11-material distributing plate, 12-clamping component, 13-support, 14-bolt, 15-first vertical frame, 16-support rod, 2-blanking component, 21-stock bin, 22-support frame, 23-discharge hopper, 24-electronic scale belt, 3-material combining component, 31-first leveling plate, 32-second leveling plate, 34-connecting frame, 35-second vertical frame, 4-water adding device, 41-water pipe, 42-electromagnetic valve and 43-water spray nozzle.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
Referring to fig. 1, a method for treating the dust of sintering machine raw materials comprises the following steps:
s1: grooving the raw material, wherein the raw material is conveyed by a conveying belt, and grooving is carried out on the raw material in the conveying process to form a groove;
s2: adding the flux powder into the groove;
s3: first mixing, namely, flatly covering one side of the groove to enable the raw material to wrap one side of the flux powder;
s4: adding water, adding water into the mixture, and reacting calcium oxide in the flux powder with water to generate heat, wherein the chemical equation is as follows: 2CaO + H2O＝2Ca(OH)2The materials can be preheated in advance to form a mixture;
s5: mixing materials for the second time, and then flatly covering the other side of the groove to enable the raw materials to completely wrap the flux powder;
s6: and (4) entering a mixer, putting the mixture into the mixer, and enabling the raw materials to wrap the flux powder, so that dust is not easy to fly in the falling process.
By adopting the scheme, before the mixture is mixed, the raw materials are grooved, the flux powder is put into the grooves, and then the raw materials are covered on the flux powder, so that the problem of flux powder dust emission is effectively avoided in a physical covering mode; meanwhile, water is added to the materials in advance during material mixing, so that the effect of preheating the materials can be achieved.
Referring to fig. 2, the invention also provides a device for treating the raw material dust of the sintering machine, which takes the transportation direction of the transportation belt as the front and rear position reference and specifically comprises:
the slotting component 1 is erected on the conveying belt and is opposite to the conveying direction of the conveying belt;
the blanking assembly 2 is positioned at the rear end of the slotting assembly 1, and a blanking point is positioned right above the conveying belt;
and the material mixing component 3 is positioned behind the blanking component 2, is provided with a leveling plate, and can automatically level when the mixed material passes through.
See fig. 3 and fig. 4, fluting subassembly 1 is triangle-shaped including dividing flitch 11, divides flitch 11, and one of them apex angle is just to the direction of transportation belt, divides flitch 11 to open a slot in the middle of the mixture through the apex angle, divide flitch 11 to have a clamping part 12 of U-shaped, and support 13 one end has been inserted to the opening part in the middle of this clamping part 12, has seted up corresponding screw on clamping part 12 and the support 13, realizes the swing joint between branch flitch 11 and the support 13 through bolt 14 and screw cooperation, when bold material passes through, can jack-up branch flitch 11, passes through smoothly, avoids the bold material card to cause the problem of potential safety hazard between transportation belt and branch flitch 11.
The support 13 is 7-shaped, one end of the support is fixed on a door-shaped vertical frame I15, the two vertical frames I15 are connected in a hinged mode, the vertical frame I15 stretches across two ends of the conveying belt, and the other end of the vertical frame I is connected with the material distributing plate 11 in a downward inclined mode; a supporting rod 16 extends from one end, connected with the first vertical frame 15, of the support 13, the supporting rod 16 is connected with a guide plate, and the guide plate is fixed on the first vertical frame 15, so that the support 13 is prevented from deviating.
The blanking assembly 2 comprises a storage bin 21 for storing materials, a discharge hopper 23 is arranged at the bottom of the storage bin 21, an electronic scale belt 24 is arranged right below the discharge hopper 23, and the storage bin 21 and the electronic scale belt 24 are respectively supported and fixed through a support frame 22 at the bottom; the electronic scale belt 24 comprises two belt pulleys, one of the belt pulleys is in power connection with the power mechanism, the belt is wound on the two belt pulleys, the electronic scale belt 24 moves towards the conveying belt, the tail end of the electronic scale belt is located right above the conveying belt, and the flux powder is smoothly poured onto the conveying belt.
The discharge hopper 23 is in a funnel shape with a wide upper part and a narrow lower part, the upper end of the discharge hopper is provided with an opening and is integrally connected to the bottom of the storage bin 21, and the lower end of the discharge hopper is provided with an opening and is positioned right above an electronic scale belt 24; the upper end of the discharge hopper 23 is in a round table shape, the lower end of the discharge hopper is in a cylindrical shape, and the diameter of the discharge hopper is smaller than the width of the electronic scale belt 24; ensuring that the flux powder does not scatter outside the belt 24 of the electronic scale.
In one of them embodiment, close material subassembly 3 including two leveling plates, the leveling plate is established at the front and back both ends of conveyer belt separately, one of them is leveling plate one 31, another is leveling plate two 32, correspond once to close material and secondary material combination technology respectively, see fig. 2, leveling plate one 31 is partial to conveyer belt left side and towards the left side slope, leveling plate two 32 are partial to conveyer belt right side towards the right side slope, when the material passes through, flush the material left side by leveling plate one 31 earlier, be provided with watering device 4 between two leveling plates, add water to the flux powder after the left side covers, later, flush the right side through leveling plate two 32 again, realize the complete coverage of flux powder. The leveling plate is rectangular, the bottom surface of the leveling plate is kept horizontal, and the leveling plate is fixed on a second portal-shaped vertical frame 35 through a connecting frame 34; the watering device 4 comprises a water pipe 41, one end of the water pipe 41 is connected with a water source through an electromagnetic valve 42, the other end of the water pipe is fixed on the second vertical frame 35, and a water spraying port 43 is arranged at the port of the water pipe and is positioned in the middle of the second vertical frame and sprays water downwards.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A method for treating dust generated by sintering machine raw materials is characterized by comprising the following steps:
s1: grooving the raw material, wherein the raw material is conveyed by a conveying belt, and grooving is carried out on the raw material in the conveying process to form a groove;
s2: adding the flux powder into the groove;
s3: first mixing, namely, flatly covering one side of the groove to enable the raw material to wrap one side of the flux powder;
s4: adding water, adding water into the mixture, and reacting calcium oxide in the flux powder with water to generate heat, wherein the chemical equation is as follows: 2CaO + H2O＝2Ca(OH)2，The materials can be preheated in advance;
s5: mixing materials for the second time, and then flatly covering the other side of the groove to enable the raw materials to completely wrap the flux powder;
s6: and (4) entering a mixer, putting the mixture into the mixer, and enabling the raw materials to wrap the flux powder, so that dust is not easy to fly in the falling process.
2. The utility model provides a sintering machine raw materials raise dust administers device which characterized in that follows regards as the position reference around with the conveying belt direction of transportation, specifically including:
the slotting component is erected on the conveying belt and is opposite to the conveying direction of the conveying belt;
the blanking assembly is positioned at the rear end of the slotting assembly, and a blanking point of the blanking assembly is positioned right above the conveying belt;
the material mixing component is positioned behind the blanking component and provided with a leveling plate, and the mixed material can be automatically leveled when passing through.
3. The device for treating the raw material dust of the sintering machine according to claim 2, wherein the slotting component comprises a material distributing plate, the material distributing plate is triangular, one vertex angle of the material distributing plate faces the transportation direction of the transportation belt, the middle of the mixture is slotted through the vertex angle, and the material distributing plate is movably connected to the support.
4. The apparatus according to claim 3, wherein said support is 7-shaped, one end of said support is fixed to a first portal-shaped vertical frame, said first vertical frame spans two ends of said conveyor belt, and the other end of said vertical frame is connected with said material distributing plate in a downward-inclined manner.
5. The device for controlling the dust emission of the raw materials of the sintering machine as claimed in claim 4, wherein a support rod is extended from the end of the support connected with the first vertical frame, the support rod is connected with a guide plate, and the guide plate is fixed on the first vertical frame to prevent the support from shifting.
6. The device for treating the dust emission of the raw materials of the sintering machine according to claim 2, wherein the blanking assembly comprises a bin for storing the materials, a discharge hopper is arranged at the bottom of the bin, an electronic scale belt is arranged right below the discharge hopper, the electronic scale belt moves towards the direction of the conveying belt, and the tail end of the electronic scale belt is positioned right above the conveying belt.
7. The apparatus of claim 6, wherein the discharge hopper is shaped like a funnel with a wide top and a narrow bottom, and has an opening at its upper end and is fixed to the bottom of the storage bin, and an opening at its lower end and is located directly above the belt of the electronic scale; the upper end of the discharge hopper is in a round table shape, the lower end of the discharge hopper is in a cylindrical shape, and the diameter of the discharge hopper is smaller than the width of the belt of the electronic scale.
8. The device for controlling the dust emission of the raw materials of the sintering machine as claimed in claim 6, wherein the belt of the electronic scale comprises two belt pulleys, one of which is in power connection with a power mechanism; a belt is wound between the belt pulleys.
9. The sintering machine raw material dust control device of claim 2, wherein the material combination component comprises a leveling plate, the leveling plate is close to the conveying belt, the leveling plate is rectangular, the bottom surface is kept horizontal, and the leveling plate is fixed on a door-shaped vertical frame II through a connecting frame.
10. The apparatus according to claim 9, wherein said apparatus comprises two leveling plates, said two leveling plates are respectively disposed at the front and rear ends of the conveyor belt and are inclined in opposite directions, and a water adding device is disposed between said two leveling plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010214595.6A CN111346567A (en) | 2020-03-24 | 2020-03-24 | Method and device for treating raw material dust of sintering machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010214595.6A CN111346567A (en) | 2020-03-24 | 2020-03-24 | Method and device for treating raw material dust of sintering machine |
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| CN111346567A true CN111346567A (en) | 2020-06-30 |
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| CN202010214595.6A Pending CN111346567A (en) | 2020-03-24 | 2020-03-24 | Method and device for treating raw material dust of sintering machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113215392A (en) * | 2021-04-28 | 2021-08-06 | 德龙钢铁有限公司 | Method for preparing fuel by sintering material and fuel preparation device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201199128Y (en) * | 2008-05-04 | 2009-02-25 | 鞍钢股份有限公司 | Sintered aggregation belt distributor |
| CN201287031Y (en) * | 2008-08-20 | 2009-08-12 | 秦皇岛首秦金属材料有限公司 | Material blending device |
| CN201614167U (en) * | 2010-01-22 | 2010-10-27 | 宝山钢铁股份有限公司 | Dust raising prevention component of conveyer belt during feeding process |
| CN102633445A (en) * | 2012-04-25 | 2012-08-15 | 攀钢集团攀枝花钢钒有限公司 | Device and method for slaking active lime for sintering |
| CN203947140U (en) * | 2014-05-29 | 2014-11-19 | 河北钢铁股份有限公司承德分公司 | A kind of point apparatus for material combining of sintered material |
| CN106350661A (en) * | 2015-07-20 | 2017-01-25 | 中冶长天国际工程有限责任公司 | Iron ore sintering method and device without quicklime digester |
| CN208182243U (en) * | 2018-04-02 | 2018-12-04 | 武汉市经盛机电设备制造有限公司 | Calcium hydroxide dust pelletizing system in conveyor belt |
| US20190168176A1 (en) * | 2017-12-04 | 2019-06-06 | Ecolab Usa Inc. | Material Wetting System with Shroud Assembly |
| CN109850488A (en) * | 2018-12-14 | 2019-06-07 | 唐山钢铁集团有限责任公司 | A kind of auxiliary tool for addition of sintering lime |
| CN209476192U (en) * | 2018-07-18 | 2019-10-11 | 四川弘晟石油工程技术服务有限公司 | A kind of blender of the anti-fugitive dust of environmental protection |
-
2020
- 2020-03-24 CN CN202010214595.6A patent/CN111346567A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201199128Y (en) * | 2008-05-04 | 2009-02-25 | 鞍钢股份有限公司 | Sintered aggregation belt distributor |
| CN201287031Y (en) * | 2008-08-20 | 2009-08-12 | 秦皇岛首秦金属材料有限公司 | Material blending device |
| CN201614167U (en) * | 2010-01-22 | 2010-10-27 | 宝山钢铁股份有限公司 | Dust raising prevention component of conveyer belt during feeding process |
| CN102633445A (en) * | 2012-04-25 | 2012-08-15 | 攀钢集团攀枝花钢钒有限公司 | Device and method for slaking active lime for sintering |
| CN203947140U (en) * | 2014-05-29 | 2014-11-19 | 河北钢铁股份有限公司承德分公司 | A kind of point apparatus for material combining of sintered material |
| CN106350661A (en) * | 2015-07-20 | 2017-01-25 | 中冶长天国际工程有限责任公司 | Iron ore sintering method and device without quicklime digester |
| US20190168176A1 (en) * | 2017-12-04 | 2019-06-06 | Ecolab Usa Inc. | Material Wetting System with Shroud Assembly |
| CN208182243U (en) * | 2018-04-02 | 2018-12-04 | 武汉市经盛机电设备制造有限公司 | Calcium hydroxide dust pelletizing system in conveyor belt |
| CN209476192U (en) * | 2018-07-18 | 2019-10-11 | 四川弘晟石油工程技术服务有限公司 | A kind of blender of the anti-fugitive dust of environmental protection |
| CN109850488A (en) * | 2018-12-14 | 2019-06-07 | 唐山钢铁集团有限责任公司 | A kind of auxiliary tool for addition of sintering lime |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113215392A (en) * | 2021-04-28 | 2021-08-06 | 德龙钢铁有限公司 | Method for preparing fuel by sintering material and fuel preparation device |
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