CN109609712B - Method for carrying out hot stuffy treatment on steel slag by utilizing vertical steel slag stuffy pot - Google Patents
Method for carrying out hot stuffy treatment on steel slag by utilizing vertical steel slag stuffy pot Download PDFInfo
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- CN109609712B CN109609712B CN201910029133.4A CN201910029133A CN109609712B CN 109609712 B CN109609712 B CN 109609712B CN 201910029133 A CN201910029133 A CN 201910029133A CN 109609712 B CN109609712 B CN 109609712B
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- inner cavity
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- slag
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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
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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
- C21B3/10—Slag pots; Slag cars
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 discloses a method for carrying out hot smoldering treatment on steel slag by utilizing a vertical steel slag stuffy pot, which comprises the following steps: step one, filling slag and sealing covers, pouring solid hot steel slag into a slag ladle, putting the slag ladle into a pot body, and closing a locking end cover; step two, differential pressure hot stuffiness, namely, firstly performing forward differential pressure hot stuffiness, then performing pressure difference stabilizing control, then performing reverse differential pressure hot stuffiness, and then performing pressure difference stabilizing control; thirdly, replacing and decompressing, introducing inert gas into the inner cavities of the pot body and the supporting seat through an inert gas introducing device, and opening an exhaust valve to replace air until the concentration of the combustible gas is lower than a set value; then closing the inert gas introducing device, and continuously exhausting through an exhaust valve until the pressure difference between the inert gas introducing device and the outside of the pot body is zero; and step four, discharging slag and water, opening an end cover, taking out the slag ladle in the boiler body, and opening a water discharge pipe to discharge water. The processing method designed in the way is more environment-friendly, better in processing effect, higher in efficiency and safer.
Description
Technical Field
The invention relates to the technical field of steel slag hot stuffiness treatment, in particular to a method for carrying out hot stuffiness treatment on steel slag by utilizing a vertical steel slag stuffiness pot.
Background
There are many methods for treating steel slag, for example: hot splashing, hot stuffiness, water quenching, air quenching, roller granulation, and the like. Each has advantages and disadvantages: wherein the steel slag treatment efficiency of the hot splashing method is lower and pollutes the environment; the hot-disintegration method and the water quenching method have great potential safety hazard; the compressed air consumption of the air quenching method is high, and the noise is high; the roller granulation method has the advantages of general efficiency, higher equipment energy consumption, higher failure rate and higher investment.
Disclosure of Invention
The invention aims to provide a steel slag treatment method which is more environment-friendly, has higher treatment efficiency and better treatment effect and is safer.
The purpose of the invention is realized as follows: a method for carrying out hot smoldering treatment on steel slag by utilizing a vertical steel slag smoldering pot; the steel slag stewpot comprises a pot body, a cover sealing device and a slag ladle arranged in the pot body; a supporting mechanism for placing a slag ladle is arranged inside the pot body; the supporting mechanism comprises a supporting seat in sealing connection with the slag ladle and a fixed seat arranged in the supporting seat; the lower end outside the pot body is provided with a bottom support and a plurality of drain pipes; part of the drain pipe is communicated with the inner cavity of the supporting seat, and the other part of the drain pipe is communicated with the inner cavity of the pot body; the outer wall of the pot body is also provided with exhaust valves, monitoring ports, an inert gas inlet, a negative pressure extraction port and a water vapor inlet which are arranged in pairs and are respectively communicated with the inner cavity of the pot body and the inner cavity of the supporting seat; the cover sealing device comprises an end cover, a turnover mechanism for opening and closing the end cover, a pressing mechanism for pressing the end cover, and a locking mechanism for locking the end cover; the inner side of the end cover is provided with a water spraying mechanism, and the top of the end cover is provided with a limiting mechanism for limiting the angle position of the end cover; the lower half part of the slag ladle is positioned in the inner cavity of the supporting seat, and the outer wall of the lower half part of the slag ladle is provided with a plurality of air holes which are uniformly distributed; the stew pan also comprises a real-time monitoring device, an inert gas introducing device, a negative pressure manufacturing device, a steam manufacturing device and a control host.
The treatment method comprises the following steps:
firstly, filling slag and sealing a cover, pouring solid hot steel slag into a slag bag; then putting the slag ladle filled with the solid hot steel slag into the pot body by a crane; finally, the end cover is closed and is locked and sealed.
Secondly, differential pressure hot stuffiness is carried out, firstly, positive differential pressure hot stuffiness is carried out, a water spraying mechanism is started, sprayed water is contacted with the steel slag, a large amount of water vapor is generated in an inner cavity of the pot body, part of water vapor permeates into the steel slag through gaps to react with the steel slag, and part of water vapor permeates into the slag ladle and flows into the inner cavity of the supporting seat from the air holes; then, carrying out pressure-stabilizing difference control, namely, confirming the change of the pressure difference between the inner cavity of the pot body and the inner cavity of the supporting seat through the monitoring of the real-time monitoring device, and leading the pressure difference value between the inner cavity of the pot body and the inner cavity of the supporting seat to be stable and the pressure difference direction to be unchanged for a certain time through the real-time adjustment of the negative pressure manufacturing device and the steam manufacturing device; then, reverse differential pressure hot smoldering is carried out, the pressure in the inner cavity of the pot body is lower than the pressure in the inner cavity of the supporting seat through the control of the negative pressure manufacturing device and the steam manufacturing device, the direction of the differential pressure is changed, part of steam permeates into the steel slag through the air holes, part of steam permeates into the steel slag through the gaps and reacts with the steel slag, and part of steam permeates into the slag ladle and then flows into the inner cavity of the pot body from the upper opening of the slag ladle; and then carrying out pressure difference stabilizing control for a certain time.
Thirdly, replacing and decompressing, namely introducing low-temperature inert gas into the inner cavity of the pot body and the inner cavity of the supporting seat through the inert gas introducing device, and opening an exhaust valve to replace air in the inner cavity of the pot body and the inner cavity of the supporting seat until the concentration of combustible gas in the inner cavity of the pot body and the inner cavity of the supporting seat is lower than a set value; and then closing the inert gas introducing device, and continuously exhausting through an exhaust valve until the pressure difference between the inner cavity of the pot body, the inner cavity of the supporting seat and the outside of the pot body is zero.
And step four, discharging slag and water, opening an end cover, lifting a slag ladle in the boiler body out, and opening a water discharge pipe to discharge water.
Compared with the prior art, the invention has the beneficial effects that: crushing treatment is carried out in a closed environment, and dust pollution is avoided, so that the method is more environment-friendly; the device is provided with the exhaust valve, the inert gas introducing device and the real-time monitoring device, so that hidden dangers can be found in time and can be solved in time, and the device is safer. Constant pressure difference is generated by the negative pressure manufacturing device and the steam manufacturing device, so that the flow of water vapor is promoted, the permeability of the water vapor is improved, the water vapor is more fully contacted with the steel slag, calcium oxide and magnesium oxide in the steel slag are effectively digested, a better treatment effect is achieved, and the treatment efficiency is greatly improved; in addition, a vibration crushing device is further arranged, and the treatment effect and the treatment efficiency are further improved.
As the preferred scheme of the invention, the slag ladle is movably and hermetically connected with the supporting seat; a vibration crushing device is arranged on the fixed seat, and the bottom of the slag ladle is placed on the vibration crushing device; the vibration crushing device comprises a plurality of vibration dampers which are uniformly and fixedly arranged on a fixed seat, a vibration seat which is arranged at the upper ends of the plurality of vibration dampers simultaneously, and a vibration motor which is fixedly arranged on the vibration seat; at the moment, in the second step, the vibration pressure difference is hot stuffy, and a vibration crushing device is started firstly; then carrying out positive differential pressure hot sealing; then, carrying out voltage stabilization difference control; then carrying out reverse differential pressure hot sealing; and then the pressure stabilizing difference control is carried out.
Further, in the second step or the third step, as long as the real-time monitoring device monitors that the temperature or the combustible gas concentration or the air pressure in the inner cavity of the pot body or the inner cavity of the supporting seat exceeds a warning value, the control host gives an alarm, and takes corresponding measures, the steam manufacturing device is closed, the inert gas introducing device is opened, the water spraying mechanism is opened at a proper time, the exhaust valve is opened, the negative pressure manufacturing device is opened at a proper time, and the drain pipe is opened at a proper time.
Further, in the first step, the solid hot steel slag is solid steel slag having a particle size of less than 400 mm and a temperature of about 600 ℃.
Drawings
FIG. 1 is a schematic structural diagram of a steel slag stewpot used in the present invention.
FIG. 2 is a schematic view of the internal structure of the steel slag stewpot used in the present invention.
Wherein, 1 pot body, 2, the supporting mechanism, 201 supporting seat, 202 fixing base, 203 vibration breaker, 203a bumper shock absorber, 203b vibration seat, 203c vibrating motor, 3 collet, 4 blow off pipes, 4a pushing off the sediment filter mechanism, 5 discharge valve, 6 monitoring ports, 7 inert gas air inlets, 8 negative pressure extraction opening, 9 steam air inlets, 10 end cover, 10a water spray mechanism, 10b stop gear, 11 tilting mechanism, 12 hold-down mechanism, 13 locking mechanism, 14 cinder ladles, 14a bleeder vent, 15 real-time supervision device, 16 inert gas introducing device, 17 negative pressure manufacturing installation, 18 steam manufacturing installation, 19 the host computer.
Detailed Description
As shown in fig. 1-2, a method for performing hot smoldering treatment on steel slag by using a vertical steel slag smoldering pot; the steel slag stewpot comprises a pot body 1, a cover sealing device and a slag ladle 14 arranged inside the pot body 1.
A supporting mechanism 2 for placing a slag ladle 14 is arranged inside the pot body 1; the supporting mechanism 2 comprises a supporting seat 201 movably and hermetically connected with the slag ladle 14 and a fixed seat 202 arranged inside the supporting seat 201; a vibration crushing device 203 is arranged on the fixed seat 202, and the bottom of the slag ladle 14 is placed on the vibration crushing device 203; the vibration crushing device 203 comprises a plurality of dampers 203a uniformly and fixedly arranged on the fixed seat 202, a vibration seat 203b simultaneously arranged at the upper ends of the plurality of dampers 203a, and a vibration motor 203c fixedly arranged on the vibration seat 203 b; the lower end of the outside of the pot body 1 is provided with a bottom support 3 and a plurality of drain pipes 4; part of the drain pipe 4 is communicated with the inner cavity of the supporting seat 201, and the other part of the drain pipe 4 is communicated with the inner cavity of the pot body 1; the outer wall of the pot body 1 is also provided with two exhaust valves 5, a monitoring port 6, an inert gas inlet 7, a negative pressure pumping port 8 and a steam inlet 9 which are arranged pairwise and respectively communicated with the inner cavity of the pot body 1 and the inner cavity of the supporting seat 201.
The cover sealing device comprises an end cover 10, a turnover mechanism 11 for opening and closing the end cover 10, a pressing mechanism 12 for pressing the end cover 10, and a locking mechanism 13 for locking the end cover 10; the inner side of the end cap 10 is provided with a water spraying mechanism 10a, and the top of the end cap 10 is provided with a limiting mechanism 10b for limiting the angle position of the end cap 10.
The lower half part of the slag ladle 14 is positioned in the inner cavity of the supporting seat 201, and the outer wall of the lower half part of the slag ladle 14 is provided with a plurality of air holes 14a which are uniformly distributed.
The stew pan also comprises a real-time monitoring device 15, an inert gas introducing device 16, a negative pressure manufacturing device 17, a steam manufacturing device 18 and a control host 19.
The treatment method comprises the following steps:
firstly, filling slag and sealing a cover, namely pouring solid hot steel slag into a slag ladle 14; then, the slag ladle 14 filled with the solid hot steel slag is put into the pot body 1 through a travelling crane; finally the end cap 10 is closed and the seal is locked.
Secondly, vibrating differential pressure hot stuffiness, firstly starting the vibrating crushing device 203; then, carrying out positive differential pressure hot stuffiness, starting the water spraying mechanism 10a, enabling the sprayed water to be in contact with the steel slag, generating a large amount of water vapor in the inner cavity of the pot body 1, enabling part of the water vapor to permeate into the steel slag through gaps to react with the steel slag, enabling part of the water vapor to permeate into the slag ladle 14, and enabling the water vapor to flow into the inner cavity of the supporting seat 201 from the air holes 14 a; then, carrying out pressure difference stabilizing control, namely, monitoring by the real-time monitoring device 15, confirming the change of the pressure difference between the inner cavity of the pot body 1 and the inner cavity of the supporting seat 201, and regulating in real time by the negative pressure manufacturing device 17 and the steam manufacturing device 18 to ensure that the pressure difference between the inner cavity of the pot body 1 and the inner cavity of the supporting seat 201 is stable, the pressure difference direction is unchanged, and the pressure difference continues for a certain time; then, reverse differential pressure hot stuffiness is carried out, the pressure in the inner cavity of the pot body 1 is lower than the pressure in the inner cavity of the supporting seat 201 through the control of the negative pressure manufacturing device 17 and the steam manufacturing device 18, the direction of the differential pressure is changed, part of steam permeates into the steel slag through the air holes 14a, part of steam permeates into the steel slag through gaps, reacts with the steel slag, and part of steam permeates into the slag ladle 14 and then flows into the inner cavity of the pot body 1 from the upper opening of the slag ladle 14; and then carrying out pressure difference stabilizing control for a certain time.
Thirdly, replacing and decompressing, namely introducing low-temperature inert gas into the inner cavity of the pot body 1 and the inner cavity of the supporting seat 201 through the inert gas introducing device 16, and opening the exhaust valve 5 to replace air in the inner cavity of the pot body 1 and the inner cavity of the supporting seat 201 until the concentration of combustible gas in the inner cavity of the pot body 1 and the inner cavity of the supporting seat 201 is lower than a set value; then the inert gas introducing device 16 is closed, and the exhaust is continuously carried out through the exhaust valve 5 until the pressure difference between the inner cavity of the pot body 1, the inner cavity of the supporting seat 201 and the outside of the pot body 1 is zero.
And step four, discharging slag and water, opening the end cover 10, lifting the slag ladle 14 in the pot body 1 out, and opening the water discharge pipe 4 for discharging water.
In the second step or the third step, as long as the real-time monitoring device 15 monitors that the temperature or the combustible gas concentration or the air pressure in the inner cavity of the pot body 1 or the inner cavity of the supporting seat 201 exceeds the warning value, the control host 19 gives an alarm, and takes corresponding measures, the steam manufacturing device 18 is closed, the inert gas introducing device 16 is opened, the water spraying mechanism 10a is opened at a proper time, the exhaust valve 5 is opened, the negative pressure manufacturing device 17 is opened at a proper time, and the drain pipe 4 is opened at a proper time.
In the first step, the solid hot steel slag is solid steel slag with the temperature of about 600 ℃ and the granularity of less than 400 mm.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (4)
1. A method for carrying out hot smoldering treatment on steel slag by utilizing a vertical steel slag smoldering pot is characterized by comprising the following steps of: the steel slag stewpot comprises a pot body (1), a cover sealing device and a slag ladle (14) arranged in the pot body (1); a supporting mechanism (2) for placing a slag ladle (14) is arranged in the pot body (1); the supporting mechanism (2) comprises a supporting seat (201) connected with the slag ladle (14) in a sealing mode and further comprises a fixed seat (202) arranged inside the supporting seat (201); the lower end of the outer part of the pot body (1) is provided with a bottom support (3) and a plurality of drain pipes (4); part of the drain pipe (4) is communicated with the inner cavity of the supporting seat (201), and the other part of the drain pipe (4) is communicated with the inner cavity of the pot body (1); the outer wall of the pot body (1) is also provided with exhaust valves (5), a monitoring port (6), an inert gas inlet (7), a negative pressure extraction port (8) and a water vapor inlet (9) which are arranged in pairs and are respectively communicated with the inner cavity of the pot body (1) and the inner cavity of the supporting seat (201); the cover sealing device comprises an end cover (10), a turnover mechanism (11) for opening and closing the end cover (10), a pressing mechanism (12) for pressing the end cover (10), and a locking mechanism (13) for locking the end cover (10); a water spraying mechanism (10 a) is arranged on the inner side of the end cover (10), and a limiting mechanism (10 b) used for limiting the angle position of the end cover (10) is arranged at the top of the end cover (10); the lower half part of the slag ladle (14) is positioned in the inner cavity of the supporting seat (201), and a plurality of air holes (14 a) which are uniformly distributed are formed in the outer wall of the lower half part of the slag ladle (14); the stew pan also comprises a real-time monitoring device (15), an inert gas introducing device (16), a negative pressure manufacturing device (17), a steam manufacturing device (18) and a control host (19);
the treatment method comprises the following steps:
firstly, filling slag and sealing a cover, pouring solid hot steel slag into a slag bag (14); then a slag ladle (14) filled with solid hot steel slag is put into the pot body (1) through a travelling crane; finally, the end cover (10) is closed and locked and sealed;
secondly, differential pressure hot stuffiness is carried out, firstly, positive differential pressure hot stuffiness is carried out, a water spraying mechanism (10 a) is started, sprayed water is contacted with the steel slag, a large amount of water vapor is generated in the inner cavity of the pot body (1), part of water vapor permeates into the steel slag through gaps to react with the steel slag, and part of water vapor permeates into the slag ladle (14) and flows into the inner cavity of the supporting seat (201) from the air holes (14 a); then, carrying out pressure difference stabilizing control, namely, confirming the change of the pressure difference between the inner cavity of the pot body (1) and the inner cavity of the supporting seat (201) through the monitoring of the real-time monitoring device (15), and leading the pressure difference between the inner cavity of the pot body (1) and the inner cavity of the supporting seat (201) to be stable, the pressure difference direction to be unchanged and continue for a certain time through the real-time adjustment of the negative pressure manufacturing device (17) and the steam manufacturing device (18); then, reverse differential pressure hot stuffiness is carried out, the pressure in the inner cavity of the pot body (1) is lower than the pressure in the inner cavity of the supporting seat (201) through the control of the negative pressure manufacturing device (17) and the steam manufacturing device (18), the direction of the differential pressure is changed, part of steam permeates into the steel slag through the air holes (14 a), part of steam permeates into the steel slag through gaps and reacts with the steel slag, and part of steam permeates into the slag ladle (14) and then flows into the inner cavity of the pot body (1) from the upper opening of the slag ladle (14); then, carrying out voltage stabilization difference control and continuing for a certain time;
thirdly, replacing and decompressing, namely introducing low-temperature inert gas into the inner cavity of the pot body (1) and the inner cavity of the supporting seat (201) through the inert gas introducing device (16), and opening the exhaust valve (5) to replace air in the inner cavity of the pot body (1) and the inner cavity of the supporting seat (201) until the concentration of combustible gas in the inner cavity of the pot body (1) and the inner cavity of the supporting seat (201) is lower than a set value; then closing the inert gas introduction device (16), and continuously exhausting through the exhaust valve (5) until the pressure difference between the inner cavity of the pot body (1), the inner cavity of the supporting seat (201) and the outside of the pot body (1) is zero;
and step four, deslagging and draining, opening an end cover (10), lifting a slag ladle (14) in the pot body (1), and opening a drain pipe (4) to drain.
2. The method of claim 1, wherein the method comprises the following steps: the slag ladle (14) is movably and hermetically connected with the supporting seat (201); a vibration crushing device (203) is arranged on the fixed seat (202), and the bottom of the slag ladle (14) is placed on the vibration crushing device (203); the vibration crushing device (203) comprises a plurality of vibration dampers (203 a) which are uniformly and fixedly arranged on the fixed seat (202), a vibration seat (203 b) which is arranged at the upper ends of the plurality of vibration dampers (203 a) at the same time, and a vibration motor (203 c) which is fixedly arranged on the vibration seat (203 b);
at the moment, in the second step, the vibration pressure difference is hot closed, and a vibration crushing device (203) is started firstly; then carrying out positive differential pressure hot sealing; then, carrying out voltage stabilization difference control; then carrying out reverse differential pressure hot sealing; and then the pressure stabilizing difference control is carried out.
3. The method of claim 1 or 2, wherein the steel slag is subjected to hot smoldering treatment by using a vertical steel slag smoldering pot, and the method comprises the following steps: in the second step or the third step, when the real-time monitoring device (15) monitors that the temperature or the combustible gas concentration or the air pressure in the inner cavity of the pot body (1) or the inner cavity of the supporting seat (201) exceeds a warning value, the control host (19) gives an alarm and takes corresponding measures, the steam manufacturing device (18) is closed, the inert gas introducing device (16) is opened, the water spraying mechanism (10 a) is opened timely, the exhaust valve (5) is opened, the negative pressure manufacturing device (17) is opened timely, and the drain pipe (4) is opened timely.
4. The method of claim 1, wherein the method comprises the following steps: in the first step, the solid hot steel slag is solid steel slag with the temperature of about 600 ℃ and the granularity of less than 400 mm.
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| CN201910029133.4A CN109609712B (en) | 2019-01-12 | 2019-01-12 | Method for carrying out hot stuffy treatment on steel slag by utilizing vertical steel slag stuffy pot |
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| CN201910029133.4A CN109609712B (en) | 2019-01-12 | 2019-01-12 | Method for carrying out hot stuffy treatment on steel slag by utilizing vertical steel slag stuffy pot |
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| CN111041134B (en) * | 2019-07-10 | 2021-11-26 | 江苏富凯重工机械有限公司 | Method for carrying out hot stuffy treatment on steel slag by using steel slag stuffy pot |
| CN111763786A (en) * | 2020-08-04 | 2020-10-13 | 中冶节能环保有限责任公司 | High-temperature steel slag carbonization deep stabilization treatment device and method |
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| CN102230036B (en) * | 2011-04-02 | 2014-05-07 | 中冶建筑研究总院有限公司 | Waste-heat pressure closed-loop thermal treatment method for molten steel slag |
| KR101429980B1 (en) * | 2013-08-19 | 2014-08-19 | 재단법인 포항산업과학연구원 | Method for reducing H2S emitted from dry-pit slag of blast furnace and apparatus thereof |
| CN105063255B (en) * | 2015-08-06 | 2017-07-18 | 中冶节能环保有限责任公司 | A kind of vertical slag has pressure hot vexed still kettle and process for treating steel slag |
| CN204981914U (en) * | 2015-08-06 | 2016-01-20 | 中冶节能环保有限责任公司 | Vertical slag has vexed pressure cauldron that evaporates of heat of pressure |
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