CN109112238B - Spiral crushing device and method for molten steel slag - Google Patents
Spiral crushing device and method for molten steel slag Download PDFInfo
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- CN109112238B CN109112238B CN201811220057.7A CN201811220057A CN109112238B CN 109112238 B CN109112238 B CN 109112238B CN 201811220057 A CN201811220057 A CN 201811220057A CN 109112238 B CN109112238 B CN 109112238B
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- 239000002893 slag Substances 0.000 title claims abstract description 355
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 183
- 239000010959 steel Substances 0.000 title claims abstract description 183
- 238000000034 method Methods 0.000 title claims abstract description 62
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003546 flue gas Substances 0.000 claims abstract description 23
- 239000000428 dust Substances 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000005684 electric field Effects 0.000 claims description 3
- 239000012716 precipitator Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims 2
- 238000005201 scrubbing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000010924 continuous production Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910052742 iron Inorganic materials 0.000 description 9
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 238000011084 recovery Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention relates to a molten steel slag spiral crushing device and a method, wherein the molten steel slag spiral crushing device comprises: a slag pot (1), a tipping machine (2), a spiral crusher (3), a slag groove (4), a slag extractor (5), a hot closed pot (6), a flue gas treatment system and a control system (12); adopting a tipping machine to carry out deslagging, and adopting a fixed shaft spiral crusher to continuously crush the molten steel slag; the molten steel slag can be continuously poured into the spiral crusher, the spiral crusher rotates at a certain speed, the steel slag is crushed and is driven to a slag outlet, the continuous production of steel slag treatment is realized by the equipment, the conventional intermittent production mode is changed, and the steel slag treatment efficiency is greatly improved.
Description
Technical Field
The invention relates to a device and a method for spiral crushing of molten steel slag, in particular to a device and a method for spiral crushing of high-temperature molten steel slag generated in the production process of steel enterprises.
Background
China is a large country for steel production, the annual steel yield exceeds 8 hundred million tons, and the steel yield accounts for more than half of the world. About 120kg of steel slag is produced per ton of steel produced, and the annual production amount of the steel slag is more than 1 hundred million tons. The steel slag contains iron metal resources, inorganic material resources such as calcium silicate and the like, and has important resource recovery value. Iron ore resources in China are imported for a long time, and various resources are very short. Therefore, the treatment and the recycling of the steel slag have great significance in resource recovery value.
Whether recovering metal iron resources or inorganic material resources in the steel slag, the steel slag needs to be crushed and separated so as to realize separation of two materials by adopting magnetic separation and other modes, thereby respectively carrying out resource utilization. Therefore, the pretreatment process of the steel slag, namely the crushing process of the steel slag, is a key link of steel slag treatment, and how to realize efficient, environment-friendly and economical steel slag crushing treatment is the most concerned problem of the steel slag treatment process.
The existing pretreatment processes of the steel slag comprise a hot disintegrating method, a hot splashing method, a roller method, an air quenching method and the like, but all have certain problems. The hot splashing method has the advantages of lagging production mode, simple and extensive treatment process, serious environmental pollution, low metal resource recovery rate and the like, and is a steel slag treatment process which should be eliminated; the roller method is only suitable for liquid steel slag with good fluidity, small-particle metal iron is easy to be wrapped in slag particles after treatment, the recovery rate of metal iron resources is low, the purpose of tailings is single, the recycling utilization of the steel slag tailings is limited, and the roller method is only used for a few iron and steel enterprises in a steel-making system at present; the air quenching method adopts large air quantity to directly blow off and cool the liquid steel slag into fine particles, and a large amount of metal iron in the steel slag is oxidized, so that the metal iron resource can not be effectively recovered, and only one piece of domestic steel has one set of air quenching equipment at present.
The hot-closed process is the most common process for treating and applying the current steel slag, and has the advantages of wide adaptability, good steel slag pulverization effect after hot closure, contribution to slag-iron separation, high recovery rate of metal iron, qualified tailings stability and the like. The hot-disintegrating method is divided into two processes of pool-type hot-disintegrating and pressured hot-disintegrating. The pool type hot-sealing method adopts a technical method of engineering mechanized operation, namely, an excavator is used for skimming and crushing high-temperature steel slag poured into a hot-sealing pool. The operation processes of pond type hot disintegrating slag pouring, slag skimming and slag discharging are not provided with dust removing devices, and the equipment level and the environmental emission are required to be further improved. The pressured hot disintegrating mode adopts a mechanized roll crusher to crush the high-temperature steel slag, realizes the equipment automation of the crushing process, and the smoke dust is discharged in a organized way in the treatment process, but the equipment occupies large space and has high investment. In addition, the two hot disintegrating modes are both to treat the incoming steel slag in a batch mode due to the limitation of the equipment process, and continuous production operation of steel slag breaking cannot be realized.
The pressure hot disintegrating process is a trend of steel slag treatment development, but the existing crushing equipment has the problems of large occupied space, high investment and the like, and the problems need to be solved urgently. Therefore, the development of novel steel slag crushing method and equipment needs to be quickened, and the method and equipment have the advantages of high equipment automation level, small space occupation, low system investment, organized smoke dust emission and the like. Thereby providing better pre-crushing process technical equipment for the pressurized hot disintegrating of the steel slag and realizing the upgrading of the existing steel slag treatment process technical equipment.
The existing steel slag rolling and crushing process is to pour steel slag into a semi-closed steel slag crushing space, pour the steel slag into a crushing area, crush the steel slag by adopting a movable steel slag rolling crusher, and have larger occupied space of auxiliary systems such as system equipment, matched power and the like, and the crushing area has higher requirements on factory building span, height and the like. The process adopts batch slag to carry out crushing treatment, the crushing process adopts an intermittent treatment mode, and the continuous crushing process is not realized.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the fixed shaft spiral crusher to crush the molten steel slag, the molten steel slag can be continuously poured into the spiral crusher, the spiral crusher rotates at a certain speed, the steel slag is crushed and is driven to a slag outlet, and the equipment realizes continuous production of steel slag treatment, thereby greatly improving the steel slag treatment efficiency. The equipment occupies small space, has low requirements on the span and the height of a factory building, and greatly reduces the civil engineering cost; the equipment adopts a fixed spiral mode to drive the steel slag, a travelling mechanism is not required to be arranged in a steel slag crushing zone, a totally-enclosed treatment environment can be realized, and the investment of a flue gas treatment system is reduced. In a word, the system has the advantages of high equipment automation degree, good production continuity, high treatment efficiency, small space occupation, low system investment, standard environmental emission and the like, and can meet the environmental emission and economical requirements of steel slag treatment.
The invention relates to a molten steel slag spiral crushing device, which comprises: slag pot, tipping machine, screw crusher, slag trough, slag extractor, hot closed pot, flue gas treatment system and control system; the spiral crusher comprises a slag pouring opening, a crushing chamber, a driving device, a crushing shaft, crushing teeth, a nozzle and a slag outlet; the slag pouring opening is arranged at the front end of the spiral crusher, the slag outlet is arranged at the rear end of the spiral crusher, the crushing teeth are arranged on the crushing shaft, the crushing shaft extends from the front end of the spiral crusher to the rear end and is positioned in the crushing chamber, and the nozzle is arranged at the upper part of the spiral crusher and is used for spraying water to cool steel slag in the spiral crusher; the driving device is connected with the crushing shaft and is used for driving the crushing shaft to rotate, and the steel slag is crushed and driven through the rotation of crushing teeth on the crushing shaft; the slag pot can be placed on a tipping machine; the tipping machine is arranged at one side of the slag pouring opening of the spiral crusher and is used for tipping the molten steel slag in the slag pot into the slag pouring opening; the slag groove is arranged at the lower part of a slag hole of the spiral crusher; the slag groove is arranged on the slag extractor; the flue gas treatment system is partially positioned at the upper part of the slag pouring opening and is used for discharging the flue gas generated by the molten steel slag spiral crushing device after treatment; the control system is respectively connected with the tipping machine, the spiral crusher, the slag extractor, the hot stuffy tank and the flue gas treatment system; the control system is used for starting the slag extractor to convey the slag groove filled with the steel slag out from the lower part of the slag hole, and the slag groove is lifted by a crane to a hot-disintegrating tank for hot-disintegrating treatment.
The flue gas treatment system comprises a dust collector, a washing tower, an electric dust collector, an induced draft fan and a chimney; the dust collector, the washing tower, the electric dust collector, the induced draft fan and the chimney are connected by pipelines in turn; the dust collector is arranged at the upper part of the slag pouring opening.
Wherein, the control system is a PLC control system; the induced draft fan is a variable frequency induced draft fan; the driving device comprises a motor and a speed reducer, and the motor is connected with the crushing shaft through the speed reducer.
Wherein the inner diameter of the deslagging port is not smaller than 800mm. Preferably, a dry slag cushion layer is arranged at the bottom of the crushing chamber, and the thickness of the cushion layer is not less than 300mm. Preferably, the crushing shaft can rotate in the forward and reverse directions through the motor of the driving device, the motor rotates in the forward direction to push the steel slag to move towards the slag outlet, and conversely, the motor rotates in the reverse direction to push the steel slag to move towards the slag pouring outlet.
Wherein, the crushing shaft adopts the mode of water cooling to protect the crushing shaft, and the material of crushing shaft and crushing tooth is heat-resistant alloy steel. Preferably, the crushing teeth are arranged on the crushing shaft in a spiral manner, so that the steel slag travels in a spiral driving manner. Preferably, 3-12 crushing teeth may be arranged on the crushing shaft every 360 degrees along the helical line; the included angle between two adjacent crushing teeth is 30-120 degrees. Preferably, the included angle between the crushing teeth (18) and the steel slag travelling direction is 30-80 degrees.
The invention also relates to a method for carrying out spiral crushing on the molten steel slag, and the method for carrying out the spiral crushing on the molten steel slag by adopting the molten steel slag spiral crushing device preferably comprises the following steps:
(1) The slag pot containing the molten steel slag is lifted and placed on a tipping machine through a crane;
(2) Starting a tipping machine through a control system to pour molten steel slag into a crushing chamber of the spiral crusher through a slag pouring port of the spiral crusher at a certain speed;
(3) The control system starts the driving device to drive the crushing shaft of the spiral crusher to rotate, the crushing shaft drives the crushing teeth to rotate, and the rotating crushing teeth collide and agitate steel slag to crush the steel slag; meanwhile, the steel slag moves towards a slag outlet of the spiral crusher along the spiral driving direction of the spiral crusher;
(4) Starting a nozzle of a spiral crusher to spray water to cool steel slag in the spiral crusher through a control system, gradually cooling and crushing the liquid molten steel slag along with the advancing of the steel slag after entering the spiral crusher, and enabling the steel slag after preliminary cooling and crushing to fall into a slag groove from a slag outlet of the spiral crusher;
(5) The induced draft fan is started by the control system to remove dust in the deslagging and crushing process until deslagging and crushing operation are not performed;
(6) And starting a slag extractor through a control system to convey the slag groove filled with the steel slag out from the lower part of the slag hole, and lifting the slag groove to a hot disintegrating tank by adopting a crane to carry out hot disintegrating treatment.
The spiral crusher is placed obliquely downwards along the driving direction of the steel slag according to an angle smaller than 10 ℃ with the ground level, so that a slag pouring hole is higher than a slag outlet, and the spiral crusher is favorable for driving the steel slag to slag downwards. Preferably, the slag pouring time of a single slag pot is 3-20 minutes, and the slag pouring speed can be controlled by adjusting the tipping speed of the tipping machine. Preferably, the rotation speed of the crushing shaft of the screw crusher is 3-20 revolutions per minute, and the steel slag processing capacity can be improved by increasing the rotation speed of the crushing shaft, and conversely, the steel slag processing capacity can be reduced. Preferably, the water consumption of a nozzle in the spiral crusher is 80-300 kg/ton of steel slag, the temperature of the steel slag at a slag outlet can be reduced by increasing the water consumption, and conversely, the temperature of the steel slag at the slag outlet can be increased. Preferably, the temperature of the slag at the slag outlet is controlled at 400-1200 ℃, so that the preliminary cooling, solidification and crushing of the slag are realized, and certain heat can be ensured to meet the requirement of subsequent hot disintegrating treatment. Preferably, after the steel slag is crushed, the steel slag with the particle size of less than 50mm exceeds 70 percent.
Wherein, the slag pouring and crushing process of the spiral crusher produces a flue gas washing tower and is discharged outside through a chimney after dust removal of an electric dust remover, and the dust concentration is lower than 10mg/m 3 Meets the ultra-clean emission requirement.
Wherein, the step (2) and the step (5) are carried out simultaneously; preferably, step (3) and step (5) are performed simultaneously; preferably, step (4) and step (5) are performed simultaneously; preferably, step (3) and step (4) are performed simultaneously; preferably, step (3), step (4) and step (5) are performed simultaneously.
Wherein, the tilting machine is used for pouring slag, the spiral crusher is used for crushing the steel slag, the slag tank is used for receiving slag, and the washing tower and the electric dust collector) are used for dedusting simultaneously. Preferably, the control system is a PLC control system, and the PLC control system is used for controlling the starting and tipping speed of the tipping machine, the starting and crushing shaft rotating speed of the motor, the water spraying amount of the nozzle, the starting and water amount of the washing tower, the electric field strength and the flue gas flow rate of the electric dust remover, the starting and the water flow rate of the induced draft fan and the inlet and outlet of the slag extractor.
Wherein, at least one crushing tooth is arranged at any position on the crushing shaft in the device, steel slag at each position in the crushing chamber can be crushed by contact, the included angle between two adjacent crushing teeth is 30-120 degrees, and 3-12 crushing teeth can be arranged every 360 degrees along the spiral line; wherein, the included angle between the crushing teeth and the crushing shaft in the device is 30-80 degrees along the steel slag travelling direction, and the smaller the included angle is, the faster the steel slag drives the propelling speed.
The invention has the advantages of realizing the crushing treatment of the molten steel slag on the device and the method, adopting PLC remote control, having high automation degree, good production continuity, high treatment efficiency, high steel slag pulverization rate, small space occupation, low system investment, standard environmental emission, convenient production operation and the like. The method and the device greatly improve the equipping level of the steel slag crushing treatment, can carry out continuous steel slag crushing treatment, change the prior intermittent production mode, improve the steel slag treatment efficiency and effectively reduce the steel slag investment and the production operation cost.
The invention adopts a tipping machine to carry out deslagging and adopts a fixed shaft spiral crusher to carry out continuous crushing on molten steel slag. The molten steel slag can be continuously poured into a spiral crusher, the spiral crusher rotates at a certain speed, the steel slag is crushed and is driven to a slag outlet, the continuous production of steel slag treatment is realized by the equipment, and the steel slag treatment efficiency is greatly improved. Crushing the steel slag<The proportion of the steel slag with the thickness of 50mm is up to more than 70%, and the pulverization rate of the steel slag is obviously improved; the deslagging process is provided with a dust collector, a washing tower and an electric dust collector dust removing device, and the smoke emission concentration is lower than 10mg/m 3 . The invention has the advantages of high automation degree, good production continuity, high treatment efficiency, small space occupation, good tightness, low system investment, ultra-clean emission and the like, and realizes the crushing treatment of the molten steel slag on the device and the methodThe method has the advantages that the equipping level of the steel slag crushing treatment is greatly improved, the traditional intermittent production mode is changed, the steel slag treatment efficiency is improved, and the steel slag investment and the production operation cost are effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a system for spiral crushing of molten steel slag.
Figure 2a is a front view of the screw crusher.
Fig. 2b side view of the screw crusher.
Fig. 3 schematically shows a crushing tooth arrangement along a helical curve of the crushing shaft.
Detailed Description
A molten steel slag spiral crusher is shown in fig. 1, 2a-b and 3, comprising: slag pot 1, tipping machine 2, screw breaker 3, slag tank 4, slag extractor 5, hot disintegrating pot 6, flue gas treatment system and control system 12, preferably PLC control system 12; the screw crusher 3 comprises a slag pouring opening 13, a crushing bore 14, a driving device, a crushing shaft 17, crushing teeth 18, a nozzle 19 and a slag hole 20; the slag pouring opening 13 is arranged at the front end of the screw crusher 3, the slag outlet 20 is arranged at the rear end of the screw crusher 3, the crushing teeth 18 are arranged on the crushing shaft 17, the crushing shaft 17 extends from the front end to the rear end of the screw crusher 3 and is positioned in the crushing chamber 14, and the nozzle 19 is arranged at the upper part of the screw crusher 3 and is used for spraying water to cool steel slag in the screw crusher; the driving device is connected with the crushing shaft and is used for driving the crushing shaft 17 to rotate, and the steel slag is crushed and driven through the rotation of the crushing teeth 18 on the crushing shaft 17; the slag pot 1 can be placed on a tipping machine 2; the tipping machine 2 is arranged at one side of the slag pouring opening 13 of the spiral crusher 3 and is used for tipping the molten steel slag in the slag pot 1 into the slag pouring opening 13; the slag groove 4 is arranged at the lower part of a slag hole 20 of the spiral crusher 3; the slag bath 4 is arranged on the slag extractor 5; the flue gas treatment system is partially positioned at the upper part of the slag pouring opening 13 and is used for discharging the flue gas generated by the molten steel slag spiral crushing device after treatment; the control system 12 is respectively connected with the tipping machine 2, the spiral crusher 3, the slag extractor 5, the hot stuffy tank 6 and the flue gas treatment system; the control system 12 is used for starting the slag extractor 5 to convey the slag groove 4 filled with the steel slag out from the lower part of the slag outlet 20, and the slag groove 4 is lifted by a crane to the hot disintegrating tank 6 for hot disintegrating treatment.
As shown in fig. 1, the flue gas treatment system comprises a dust collector 7, a washing tower 8, an electric dust collector 9, an induced draft fan 10 and a chimney 11; the dust collector 7, the washing tower 8, the electric dust collector 9, the induced draft fan 10 and the chimney 11 are connected by pipelines in sequence; the dust collector 7 is disposed at an upper portion of the slag pouring opening 13. The control system 12 is a PLC control system; the induced draft fan 10 is a variable frequency induced draft fan; as shown in fig. 2, the driving device comprises a motor 15 and a speed reducer 16, and the motor 15 is connected with a crushing shaft 17 through the speed reducer 16. The inner diameter of the slag pouring opening 13 is not smaller than 800mm. Preferably, a dry slag cushion layer is arranged at the inner bottom of the crushing chamber 14, and the thickness of the cushion layer is not less than 300mm. Preferably, the crushing shaft 17 can rotate in the forward and reverse directions through the motor 15 of the driving device, the forward rotation of the motor 15 can push the steel slag to move towards the slag outlet 20, and the reverse rotation can push the steel slag to move towards the slag pouring outlet 13. The crushing shaft 17 is protected by adopting a water cooling mode, and the crushing shaft 17 and the crushing teeth 18 are made of heat-resistant alloy steel. Preferably, the crushing teeth 18 are arranged on the crushing shaft 17 in a helical manner, so that the steel slag travels in a helical drive. Preferably, 3-12 crushing teeth 18 may be arranged on the crushing shaft 17 every 360 degrees along the helical line; the angle between two adjacent crushing teeth 18 is 30-120 degrees. Preferably, the included angle between the crushing teeth 18 and the steel slag travelling direction is 30-80 degrees.
Further, as shown in fig. 1 to 3, a molten steel slag spiral crusher, comprising: slag pot 1, tipping machine 2, screw crusher 3, slag tank 4, slag extractor 5, hot closed pot 6, dust collector 7, washing tower 8, electric dust collector 9, induced draft fan 10, chimney 11, PLC control system 12; the device also comprises a spiral crusher 3, wherein the spiral crusher is composed of a slag pouring hole 13, a crushing chamber 14, a motor 15, a speed reducer 16, a crushing shaft 17, crushing teeth 18, a nozzle 19 and a slag hole 20; wherein the device also comprises a slag pot 1 arranged on a tipping machine 2; the tipping machine 2 is arranged on one side of the slag pouring opening 13 of the spiral crusher 3; the slag groove 4 is arranged at the lower part of the slag hole 20 of the spiral crusher 3; the slag bath 4 is arranged on the slag extractor 5; the dust collector 7 is arranged at the upper part of the slag pouring opening 13; the dust collector 7, the washing tower 8, the electric dust collector 9, the induced draft fan 10 and the chimney 11 are connected by adopting pipelines; the device also comprises a variable frequency fan as the induced draft fan 10; wherein the inner diameter of the slag pouring opening 13 in the device is not less than 800mm; wherein a dry slag cushion layer is arranged at the inner bottom of a crushing chamber 14 of a screw crusher 3 in the device, and the thickness of the cushion layer is not less than 300mm; in the device, a screw crusher 3 drives a crushing shaft 17 to rotate by a motor 15 and a speed reducer 16, and crushing teeth 18 on the crushing shaft 17 rotate to crush and drive steel slag; in the device, the crushing shaft 17 of the spiral crusher 3 can rotate in the forward and reverse directions through the motor 15, the forward rotation of the motor 15 can push steel slag to move towards the slag outlet 20, and the reverse rotation of the motor 15 can rotate the steel slag to move towards the slag pouring outlet 13; wherein, the crushing shaft 17 in the device adopts a water cooling mode to protect the crushing shaft 17, and the crushing shaft 17 and the crushing teeth 18 are manufactured by adopting heat-resistant alloy steel as raw materials; wherein the crushing teeth 18 are arranged on the crushing shaft 17 in a spiral manner in the device, so that the steel slag moves in a spiral driving manner; at least one crushing tooth 18 is arranged at any position on the crushing shaft 17 in the device, steel slag at each position in the crushing chamber 14 can be crushed by contact, the included angle between every two adjacent crushing teeth 18 is 30-120 degrees, and 3-12 crushing teeth 18 can be arranged every 360 degrees of rotation of the spiral line; wherein the included angle between the crushing teeth 18 and the crushing shaft 17 in the device is 30-80 degrees along the steel slag travelling direction, and the smaller the included angle is, the faster the steel slag drives the propelling speed; in the device, the spiral crusher 3 sprays water to cool the steel slag through the upper nozzle 19.
As shown in fig. 1-3, a method for spiral crushing of molten steel slag by using the device comprises the following steps: (1) The slag pot 1 containing the molten steel slag is lifted and placed on the tipping machine 2 by a crane. (2) The tilting machine 2 is started through the PLC control system 12 to pour the molten steel slag into the crushing chamber 14 of the spiral crusher 3 through the slag pouring opening 13 at a certain speed. (3) The PLC control system 12 starts a driving motor 15 and a speed reducer 16 to drive a crushing shaft 17 of the spiral crusher 3 to rotate, the crushing shaft 17 drives crushing teeth 18 to rotate, and the rotating crushing teeth 18 collide and stir steel slag to crush the steel slag; while the slag travels toward the slag hole 20 in a screw driving manner of the screw crusher 3. (4) The PLC control system 12 starts to open the nozzle 19 to spray water for cooling the steel slag in the spiral crusher 3, the liquid molten steel slag is gradually cooled and crushed along with the travelling of the steel slag after entering the spiral crusher 3, and the steel slag after preliminary cooling and crushing falls into the slag groove 4 from the slag outlet 20. (5) The slag extractor 5 is started by the PLC control system 12 to transport the slag tank 4 filled with the steel slag out from the lower part of the slag outlet 20, and the slag tank 4 is lifted by a crane to the hot-closed tank 6 for hot-closed treatment. (6) The induced draft fan 10 is started by the PLC control system 12 to remove dust in the deslagging and crushing process until deslagging and crushing operations are not performed.
Wherein, the step (2) and the step (5) are carried out simultaneously; preferably, step (3) and step (5) are performed simultaneously; preferably, step (4) and step (5) are performed simultaneously; preferably, step (3) and step (4) are performed simultaneously; preferably, step (3), step (4) and step (5) are performed simultaneously.
Wherein, the spiral crusher 3 is arranged obliquely downwards along the driving direction of the steel slag according to the angle of 0-10 ℃ with the ground level, so that the slag pouring opening 13 is higher than the slag outlet 20, and the driving of the steel slag to downwards slag is facilitated. Preferably, the screw crusher 3 is placed obliquely downwards in the steel slag driving direction at an angle of less than 10 ℃ with the ground level. The slag pouring time of the single slag pot 1 is 3-20 minutes, and the slag pouring speed can be controlled by adjusting the tipping speed of the tipping machine 2. The rotating speed of the crushing shaft 17 of the spiral crusher 3 is 3-20 revolutions per minute, so that the steel slag processing capacity can be improved by increasing the rotating speed of the crushing shaft 17, and conversely, the steel slag processing capacity can be reduced. The water quantity of the nozzle 19 in the spiral crusher 3 is 80-300 kg/ton of steel slag, the temperature of the slag outlet 20 steel slag can be reduced by increasing the water quantity, and otherwise, the temperature of the slag outlet 20 steel slag can be increased. The temperature of the slag outlet 20 steel slag is controlled at 400-1200 ℃, so that the steel slag is ensured to be primarily cooled, solidified and crushed, and meanwhile, certain heat can be ensured to meet the requirement of subsequent hot disintegrating treatment. After the steel slag is crushed, the grain size<50mm steel slag exceeds 70%. The flue gas generated in the deslagging and crushing processes of the spiral crusher 3 is discharged through a chimney 11 after being dedusted by a washing tower 8 and an electric precipitator 9, and the dust concentration is lower than 10mg/m 3 Meets the ultra-clean emission requirement. The tilting machine 2 is used for pouring slag, the spiral crusher 3 is used for crushing the steel slag, the slag tank 4 is used for receiving the slag, and the washing tower 8 and the electric dust remover 9 are used for removing dust simultaneously. The PLC control system 12 controls the turning-on and turning-over rate of the tipping machine 2, the starting of the motor 15 and the rotation of the crushing shaft 17 through programmingThe speed, the water spraying amount of the spray nozzle 19, the opening and water amount of the washing tower 8, the electric field intensity of the electric dust collector 9, the flue gas flow rate, the opening of the fan 10 and the inlet and outlet of the slag extractor 5.
Claims (17)
1. A molten steel slag spiral crusher, characterized in that the molten steel slag spiral crusher comprises: a slag pot (1), a tipping machine (2), a spiral crusher (3), a slag groove (4), a slag extractor (5), a hot closed pot (6), a flue gas treatment system and a control system (12); the spiral crusher (3) comprises a slag pouring opening (13), a crushing chamber (14), a driving device, a crushing shaft (17), crushing teeth (18), a nozzle (19) and a slag outlet (20); the slag pouring opening (13) is formed in the front end of the spiral crusher (3), the slag outlet (20) is formed in the rear end of the spiral crusher (3), crushing teeth (18) are formed in a crushing shaft (17), the crushing shaft (17) extends from the front end to the rear end of the spiral crusher (3) and is positioned in the crushing chamber (14), and the nozzle (19) is arranged at the upper part of the spiral crusher (3) and used for spraying water to cool steel slag in the spiral crusher; the driving device is connected with the crushing shaft and is used for driving the crushing shaft (17) to rotate, and crushing and driving the steel slag through the rotation of crushing teeth (18) on the crushing shaft (17); the slag pot (1) is arranged on the tipping machine (2); the tipping machine (2) is arranged at one side of a slag pouring opening (13) of the spiral crusher (3) and is used for tipping molten steel slag in the slag pot (1) into the slag pouring opening (13); the slag groove (4) is arranged at the lower part of a slag hole (20) of the spiral crusher (3); the slag groove (4) is arranged on the slag extractor (5); the flue gas treatment system is partially positioned at the upper part of the slag pouring opening (13) and is used for discharging the flue gas generated by the molten steel slag spiral crushing device after treatment; the control system (12) is respectively connected with the tipping machine (2), the spiral crusher (3), the slag extractor (5), the hot stuffy pot (6) and the flue gas treatment system; the control system (12) is used for starting the slag extractor (5) to convey the slag groove (4) filled with the steel slag out from the lower part of the slag outlet (20), and lifting the slag groove (4) to the hot disintegrating tank (6) by adopting travelling crane to carry out hot disintegrating treatment;
the crushing shaft (17) rotates in the positive and negative directions through a motor (15) of the driving device, the motor (15) rotates in the positive direction to push steel slag to move towards the slag outlet (20), and conversely rotates in the opposite direction to push steel slag to move towards the slag pouring outlet (13);
the crushing shaft (17) is protected by adopting a water cooling mode, and the crushing shaft (17) and the crushing teeth (18) are made of heat-resistant alloy steel; the crushing teeth (18) are arranged on the crushing shaft (17) in a spiral line manner, so that the steel slag moves in a spiral driving manner; 3-12 crushing teeth (18) are arranged on the crushing shaft (17) every 360 degrees along the helical line; the included angle between two adjacent crushing teeth (18) is 30-120 degrees.
2. The spiral crushing device for molten steel slag according to claim 1, wherein the flue gas treatment system comprises a dust collector (7), a washing tower (8), an electric dust collector (9), an induced draft fan (10) and a chimney (11); the dust collector (7), the washing tower (8), the electric dust collector (9), the induced draft fan (10) and the chimney (11) are connected by pipelines in sequence; the dust collector (7) is arranged at the upper part of the slag pouring opening (13).
3. The device according to one of claims 1-2, characterized in that the control system (12) is a PLC control system; the induced draft fan (10) is a variable frequency induced draft fan; the driving device comprises a motor (15) and a speed reducer (16), and the motor (15) is connected with the crushing shaft (17) through the speed reducer (16).
4. The device according to any one of claims 1-2, characterized in that the pouring opening (13) has an inner diameter of not less than 800mm.
5. The device according to any of the claims 1-2, characterized in that a dry slag cushion layer is provided at the bottom of the crushing chamber (14), the thickness of the cushion layer being not less than 300mm.
6. The apparatus according to any of the claims 1-2, characterized in that the angle between the crushing teeth (18) and the direction of travel of the steel slag is 30-80 degrees.
7. A method for spiral crushing of molten steel slag by using the apparatus for spiral crushing of molten steel slag according to any one of claims 1 to 6, comprising the steps of:
(1) A slag pot (1) filled with molten steel slag is lifted and placed on a tipping machine (2) through a crane;
(2) Starting the tipping machine (2) through the control system (12) to pour the molten steel slag into a crushing chamber (14) of the spiral crusher (3) through a slag pouring port (13) of the spiral crusher (3) at a certain speed;
(3) The control system (12) starts the driving device to drive the crushing shaft (17) of the spiral crusher (3) to rotate, the crushing shaft (17) drives the crushing teeth (18) to rotate, and the rotating crushing teeth (18) collide and agitate steel slag to crush the steel slag; meanwhile, the steel slag moves towards a slag outlet (20) of the spiral crusher (3) along the spiral driving direction of the spiral crusher (3);
(4) Starting a nozzle (19) of the spiral crusher (3) to spray water to cool steel slag in the spiral crusher (3) through a control system (12), gradually cooling and crushing the liquid molten steel slag along with the advancing of the steel slag after entering the spiral crusher (3), and enabling the steel slag after preliminary cooling and crushing to fall into a slag groove (4) from a slag outlet (20) of the spiral crusher (3);
(5) A draught fan (10) is started through a control system (12) to remove dust in the deslagging and crushing process until deslagging and crushing operation are not performed;
(6) The slag extractor (5) is started by the control system (12) to transport the slag groove (4) filled with steel slag out from the lower part of the slag outlet (20), and the slag groove (4) is lifted by a crane to the hot disintegrating tank (6) for hot disintegrating treatment.
8. The method according to claim 7, wherein the screw crusher (3) is placed at an angle of less than 10 degrees to the ground level, obliquely downwards in the slag driving direction, so that the slag pouring opening (13) is higher than the slag outlet (20), facilitating the driving of the slag downwards.
9. Method according to one of the claims 7-8, characterized in that the slag pouring time of the individual slag pot (1) is 3-20 minutes, the slag pouring speed being controlled by adjusting the tilting speed of the tilting machine (2).
10. Method according to one of claims 7-8, characterized in that the crushing shaft (17) of the screw crusher (3) is rotated at a speed of 3-20 revolutions per minute, whereby the steel slag handling capacity is increased by increasing the speed of the crushing shaft (17) and vice versa.
11. Method according to one of the claims 7-8, characterized in that the water tapping amount of the nozzle (19) in the screw crusher (3) is 80-300 kg/ton of steel slag, the slag temperature of the slag tap (20) is lowered by increasing the water tapping amount, whereas the slag temperature of the slag tap (20) is increased.
12. The method according to any one of claims 7 to 8, characterized in that the slag temperature of the slag tap (20) is controlled between 400 ℃ and 1200 ℃, which ensures that the preliminary cooling, solidification and crushing of the slag are achieved, and that a certain amount of heat is provided to meet the requirements of subsequent hot-disintegrating treatment.
13. The method according to any one of claims 7 to 8, wherein the steel slag has a particle size of <50mm after the crushing treatment of more than 70%.
14. The method according to any of claims 7-8, characterized in that the dust-removing and crushing process of the screw crusher (3) produces flue gas which is discharged through a chimney (11) after dust removal by a scrubber (8) and an electric precipitator (9), the dust concentration being lower than 10mg/m 3 Meets the ultra-clean emission requirement.
15. The method according to any one of claims 7 to 8, wherein step (2) and step (5) are performed simultaneously.
16. Method according to one of claims 7-8, characterized in that the tilting machine (2) is operated to pour slag, the screw crusher (3) is operated to crush the slag, the slag chute (4) is operated to receive slag, and the scrubbing tower (8) and the electric precipitator (9) are operated simultaneously.
17. The method according to any one of claims 7-8, characterized in that the control system is a PLC control system, by means of which the turning-on and turning-over rate of the tilting machine (2), the motor (15) start-up and the rotational speed of the crushing shaft (17), the water jet quantity of the nozzles (19), the opening and water quantity of the washing tower (8), the electric field strength and the flue gas flow rate of the electric dust collector (9), the opening of the induced draft fan (10) and the in and out of the slag extractor (5) are controlled.
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