CN114799186A - Method and control device for regulating and controlling atomization water pressure based on water atomization molten steel temperature - Google Patents
Method and control device for regulating and controlling atomization water pressure based on water atomization molten steel temperature Download PDFInfo
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- CN114799186A CN114799186A CN202210502270.7A CN202210502270A CN114799186A CN 114799186 A CN114799186 A CN 114799186A CN 202210502270 A CN202210502270 A CN 202210502270A CN 114799186 A CN114799186 A CN 114799186A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 238000000889 atomisation Methods 0.000 title claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000001276 controlling effect Effects 0.000 title claims abstract description 18
- 238000009692 water atomization Methods 0.000 title claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 37
- 230000008859 change Effects 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
- B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention discloses a method and a control device for regulating and controlling atomization water pressure based on the temperature of water atomization molten steel. The water atomized steel iron powder prepared by the method has stable particle size distribution, high utilization rate of raw materials, no subsequent batch combination process, improved compressibility, apparent density, fluidity and other properties, and good consistency.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a method and a control device for regulating and controlling atomizing water pressure based on water atomizing molten steel temperature.
Background
The water atomized steel iron powder is an important raw material for preparing parts in the powder metallurgy industry, and the properties of compressibility, apparent density, fluidity and the like of the water atomized steel iron powder have important influence on the quality of downstream products. Along with the continuous improvement of the quality requirements of parts in the downstream fields of automobiles, electric tools, household appliances and the like, the performance requirements of the raw material water-atomized steel iron powder are also continuously improved.
The water atomization process technology is a common technology for realizing an industrial production mode in the field of powder metallurgy, and the method is an industrial production mode for producing steel powder by using high-pressure atomized water to beat steel flow into superfine powder through a special nozzle, and then carrying out magnetic separation, dehydration, drying, reduction, crushing, screening, batching and packaging on the superfine powder.
At present, the preparation of water atomization steel powder mainly adopts an electric furnace with the volume of more than 20 tons to melt scrap steel, then the scrap steel flows into an atomization chamber after reaching the supersaturation temperature and passing through a tundish, and high-pressure water is utilized to spray a molten steel column, so that the molten steel is scattered, and atomization is completed. At present, the time for atomizing more than 20 tons of molten steel at one time is generally not less than 1 hour, and the molten steel can be continuously cooled during the period. The decrease of the temperature can reduce the viscosity of the molten steel, increase the surface tension, and easily cause larger fluctuation (difference between the initial time and the final time) of the apparent density and the particle size distribution under the same water pressure, thereby leading the particle size distribution of atomized particles to be widened, particularly leading the deviation of the before-and-after atomization period to be larger, and influencing the properties of the final powder such as the apparent density, the fluidity, the size change and the like.
The atomizing water pressure of the water atomization process can not change along with the temperature change of molten steel mostly, and the deviation of the particle size distribution of the powder before and after the atomization process is mainly carried out by batching after the atomized powder is dried, so that the particle size distribution of the powder is adjusted. This results in oversized and undersized powder being removed, reducing material usage, increasing production costs, and reducing production efficiency.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a method and a control device for regulating and controlling the pressure of atomized water based on the temperature of water atomized molten steel. The water atomized steel iron powder prepared by the method has stable particle size distribution, improves the finished product rate, saves subsequent batch combination procedures, improves the performances of compressibility, apparent density, fluidity and the like of products, and has good consistency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an atomization water pressure control device which comprises a first stop valve and a second stop valve which are connected through an atomization water pipe, wherein the first stop valve is connected with a booster pump, the second stop valve is connected with an atomization nozzle, one end of the atomization water pipe is connected with the booster pump, and the other end of the atomization water pipe is connected with the atomization nozzle, and the second stop valve controls and adjusts the angle of the stop valve to finely adjust the water pressure along with the change of atomization time.
In a preferred embodiment of the present invention, the first stop valve is a high-pressure stop valve, and the second stop valve is a coaxial motor stop valve.
As a preferable scheme of the invention, the angle adjustment range of the second stop valve is 255-300 degrees.
In a preferable embodiment of the present invention, the output water pressure of the first stop valve is 10 to 26 MPa.
The invention provides a method for regulating and controlling atomization water pressure based on the temperature of water atomization molten steel by adopting the atomization water pressure control device.
As a preferred scheme of the present invention, the method specifically comprises:
1) measuring and recording the temperature of the molten steel surface smelted by the electric furnace;
2) when the atomization starts, measuring and recording the temperature of the molten steel in the tundish;
3) in the atomization process, measuring and recording the temperature of the molten intermediate ladle steel at regular intervals until the atomization process is finished;
4) combining the molten steel temperature data obtained in the steps 1) to 3) with atomization time, and drawing a molten steel temperature-time curve relation graph;
5) converting the temperature-time curve data into control parameters of a stepping coaxial motor in the atomization water pressure control device according to parameters of the atomization water pressure control device, and enabling the atomization water pressure control device to adjust the angle along with the change of atomization time according to preset settings so as to adjust the water pressure and enable the water pressure to be increased according to the reduction of the temperature of the molten steel; and after the atomization is finished, drying the powder to obtain coarse powder.
As a preferable scheme of the invention, the method further comprises the following step 6): and (5) repeating the steps 1) to 5) for multiple times, and correcting parameters of the atomized water control device according to the result of the particle size distribution of the powder, so as to finally obtain the atomized water pressure control process parameters suitable for the water atomization iron and steel powder atomization process.
As a preferred scheme of the invention, in the step 5), the curve relationship between the atomization water pressure and the molten steel temperature and the curve relationship between the molten steel temperature and the time in the step 4) are drawn firstly, and the curve relationship between the atomization water pressure and the atomization time is fitted; and according to the curve relation between the atomization water pressure and the angle of the second stop valve, correlating the curve relation between the atomization water pressure and the angle of the second stop valve and the curve relation between the atomization water pressure and the atomization time to obtain the curve relation between the atomization time and the angle of the second stop valve.
As a preferable scheme of the present invention, the output water pressure of the second stop valve is: controlling the water pressure to be 17.5-17.6MPa within 0-60 min; controlling the water pressure to be 17.75-18.5MPa in 60-65 min; controlling the water pressure at 19.1-20.1MPa within 65-70 min; the water pressure is controlled at 20.1-20.5MPa in 70-75 min.
As a preferable scheme of the invention, in the step 3), the temperature of the molten intermediate ladle steel is measured and recorded every 1-20 minutes.
Compared with the prior art, the invention has the following beneficial effects:
1) the atomization water pressure control device can be realized only by slightly changing the original atomization device, no additional manufacturing equipment is needed, the cost of the equipment is reduced, and the device is simple;
2) the method combines the automatic control of the temperature of the molten steel and the water pressure, and solves the problem that the particle size distribution of the powder is widened due to the temperature reduction in the later period before atomization;
3) the water atomized steel iron powder prepared by the method has stable particle size distribution, omits the subsequent batch combination process, improves the properties of compressibility, apparent density, fluidity and the like of the product, and has good consistency.
Drawings
FIG. 1 is a graph showing the temperature of molten steel versus the atomization time in a 20t electric furnace atomization process.
FIG. 2 is a graph showing the atomized water pressure-molten steel temperature.
Fig. 3 is a graph of atomization water pressure versus atomization time.
Fig. 4 is a schematic diagram of a double-stop valve hydraulic control structure.
FIG. 5 is a graph of the angle of the on-axis motor shut-off valve versus the water pressure.
FIG. 6 is a graph of atomization time versus coaxial shut-off valve angle.
In the figure, 1, a first stop valve; 2. a second stop valve; 3. an atomized water pipe; 4. an atomizing spray head.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 4, the invention provides an atomization water pressure control device, which comprises a first stop valve 1 (namely a high-pressure stop valve) and a second stop valve 2 (a coaxial motor stop valve) which are connected through an atomization water pipe 3, wherein the first stop valve 1 (namely the high-pressure stop valve) is connected with a booster pump (not shown in the figure), the second stop valve 2 (the coaxial motor stop valve) is connected with an atomization nozzle 4, and the second stop valve 2 (the coaxial motor stop valve) controls and adjusts the stop valve angle to finely adjust the water pressure along with the change of atomization time.
The angle adjustment range of the second stop valve 2 (coaxial motor stop valve) is 255-300 degrees.
The output water pressure of the first stop valve 1 (namely, the high-pressure stop valve) is 10-26 MPa.
The invention also provides a method for regulating and controlling the atomizing water pressure based on the temperature of the water atomized molten steel, which is carried out under the condition that the tapping temperature is 1720 ℃.
Examples
The embodiment provides a method for regulating atomization water pressure based on water atomization molten steel temperature, which comprises the following steps:
1) before atomizing molten steel, completely opening a high-pressure stop valve, reducing the water pressure to 10-26MPa by using the stop valve after a booster pump is started, and then opening a coaxial motor stop valve to reduce the water pressure to 15-18 MPa; the reason is that the opening and closing degree of the high-pressure stop valve is nonlinear with the water pressure, and the newly added coaxial motor stop valve can ensure that the opening angle has approximate linear relation with the water pressure within the range of 25-80% of the input atomized water pressure, as shown in figure 5. The output water pressure of the high-pressure stop valve is 26MPa, and the angle of the coaxial motor stop valve is 255-300 degrees for fine adjustment of the water pressure.
2) And putting the steel ladle containing the molten steel on an atomization platform, starting atomization, starting a coaxial motor program, and starting timing.
The hydraulic control program for the coaxial motor is shown in fig. 3 and is obtained from the two sets of data in fig. 1 and 2.
Firstly, by measuring the change rule of the temperature of the molten steel in the production along with the time, as shown in fig. 1, when the molten steel is poured into the steel ladle at the beginning (namely from about 0-10 min), the temperature of the molten steel in the steel ladle (from 1640 ℃ to 1660 ℃) has a rising process, and the temperature is in a rising trend, because the preheating temperature of the steel ladle is only hundreds of degrees, after the molten steel is poured into the steel ladle, the molten steel transmits part of heat to the steel ladle, and then the temperature is kept stable. When the temperature is stable, the temperature of the molten steel is slowly reduced along with the atomization time.
When atomization is carried out for about 1 hour, the viscosity of the molten steel is increased due to the reduction of the temperature of the molten steel, the molten steel in the steel ladle is close to the bottom, the volume of the molten steel is reduced, the liquidity is poor, the aperture of a leak hole needs to be gradually enlarged, and the flow speed of the molten steel is improved. When the flow rate of the molten steel is increased, the temperature of the molten steel is rapidly reduced (from 1641 ℃ to 1626 ℃). And finally, when the atomization time reaches 67min, the flow rate of the molten steel is stable, and the temperature of the molten steel also tends to be stable (the temperature is reduced from 1606 ℃ C.) until the atomization process is finished (the temperature is reduced to 1600 ℃ C.).
After long-term detection of the atomization process, the curve of the atomization water pressure and the molten steel temperature under the condition of preparing the same atomized powder particle size distribution is obtained and is shown as a black square box connecting line shown in figure 2, fitting software is used for performing nonlinear fitting on the measured values under a BiDoseResP model, and the following equation is obtained:
the results of the fitting are shown in FIG. 2 in dashed lines, where R 2 Is 0.9999.
Fitting a curve relation graph of the water atomization water pressure and the atomization time, wherein as shown in fig. 3, the water pressure change of the coaxial motor stop valve is as follows: controlling the water pressure to be 17.5-17.6MPa within 0-60 min; controlling the water pressure to be 17.75-18.5MPa in 60-65 min; controlling the water pressure at 19.1-20.1MPa within 65-70 min; the water pressure is controlled at 20.1-20.5MPa in 70-75 min.
Referring to the atomization water pressure-coaxial motor stop valve angle curve as shown in fig. 5, and correlating the atomization water pressure-coaxial motor stop valve angle curve with the water atomization water pressure as shown in fig. 3 to obtain an atomization time-coaxial motor stop valve angle curve, as shown in fig. 6, when the angle of the coaxial motor stop valve is 262 degrees at 0min, the angle of the coaxial motor stop valve is basically 255-260 degrees at 1-49min, and when the angle of the coaxial motor stop valve is 50-60min, the angle of the coaxial motor stop valve is slowly increased from 260 degrees to 260 degrees; when the time is 61-63min, the angle of the stop valve of the coaxial motor is increased from 262 degrees to 264 degrees in one degree per minute; 64min, and the angle of the coaxial motor stop valve is 267 degrees; when 65min is needed, the angle of the coaxial motor stop valve is 272 degrees; when the time is 66min, the angle of the coaxial motor stop valve is 279 degrees; when 67min, the angle of the coaxial motor stop valve is 285 degrees; when 68-69min, the angle of the coaxial motor stop valve is 288.12 degrees; when the time is 70-71min, the angle of the stop valve of the coaxial motor is 291.71 degrees; when the time is 72-73min, the angle of the coaxial motor stop valve is 294.18 degrees; when the time is 74-75min, the angle of the stop valve of the coaxial motor is 296.42 degrees.
According to fig. 6, after the timing is started, the water pressure controlled by the coaxial motor is adjusted in angle with the atomization time according to a preset setting, so that the water pressure is adjusted.
3) And after the atomization is finished, dehydrating and drying the powder to obtain coarse powder.
The present invention takes the particle size of the coarse powder obtained at this time as a test standard, the particle size distribution of the atomized powder (coarse powder) before improvement is shown in table 1, the water pressure in the atomization process is adjusted by the method of the present invention, and the particle size distribution of the atomized powder (coarse powder) is shown in table 2.
TABLE 1 particle size distribution table of atomized powder (fluff) before improvement
TABLE 2 particle size distribution table of atomized powder (coarse powder) after improvement of the method of the present invention
The particle size distribution of the atomized powder (coarse powder) can be seen by comparison. The proportion of the coarse powder with the particle size of more than 80 meshes is reduced from more than 14 percent to less than 6 percent after improvement. The particle size of the fine powder with the particle size of less than 325 meshes is reduced from more than 29 percent to less than 25 percent.
The particle size of the powder of the water atomized steel iron powder is larger than 80 meshes, the powder can not be used for powder metallurgy generally, and more than 25 percent of the powder with the particle size smaller than 325 meshes needs to be removed in the subsequent batch combining process.
Therefore, the invention solves the problem that the particle size distribution of the powder is widened due to the temperature reduction in the later period before and after atomization, the water atomized steel iron powder prepared by the method has stable particle size distribution, the subsequent batch combination procedure is omitted, and the performances of the product, such as compressibility, apparent density, fluidity and the like, are improved and the consistency is good.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an atomizing water pressure control device which characterized in that includes first stop valve and the second stop valve through atomizing water piping connection, first stop valve is connected with the booster pump, the second stop valve is connected with atomizer, the second stop valve is finely tuned to water pressure along with atomizing time change control adjustment stop valve angle.
2. The atomizing water pressure control device according to claim 1, wherein the first shutoff valve is a high-pressure shutoff valve, and the second shutoff valve is a coaxial motor shutoff valve.
3. The atomizing water pressure control device according to claim 2, wherein the angle adjustment range of the second shutoff valve is 255 ° to 300 °.
4. The atomizing water pressure control device according to claim 1, wherein the output water pressure of the first cut-off valve is 10 to 26 MPa.
5. A method for regulating atomizing water pressure based on water atomized molten steel temperature, characterized in that the method uses the atomizing water pressure control device of any one of claims 1 to 4.
6. The method for regulating atomization water pressure based on water atomization molten steel temperature as claimed in claim 5, wherein the method specifically comprises:
1) measuring and recording the temperature of the molten steel surface smelted by the electric furnace;
2) when the atomization starts, measuring and recording the temperature of the molten steel in the tundish;
3) in the atomization process, measuring and recording the temperature of the molten intermediate ladle steel at regular intervals until the atomization process is finished;
4) combining the molten steel temperature data obtained in the steps 1) to 3) with atomization time, and drawing a molten steel temperature-time curve relation graph;
5) converting the temperature-time curve data into control parameters of a stepping coaxial motor in the atomization water pressure control device according to parameters of the atomization water pressure control device, and enabling the atomization water pressure control device to adjust the angle along with the change of atomization time according to preset setting, so that the water pressure is adjusted, and the water pressure is increased according to the reduction of the temperature of the molten steel; and after the atomization is finished, drying the powder to obtain coarse powder.
7. The method for regulating atomization water pressure based on water atomization molten steel temperature as claimed in claim 6, further comprising step 6): and (5) repeating the steps 1) to 5) for multiple times, and correcting parameters of the atomization water pressure control device according to the result of the particle size distribution of the powder, so as to finally obtain the atomization water pressure control process parameters suitable for the water atomization iron and steel powder atomization process.
8. The method for regulating and controlling the atomizing water pressure based on the temperature of the water atomized molten steel as claimed in claim 6, wherein in the step 5), the curve relationship between the atomizing water pressure and the molten steel temperature and the curve relationship between the molten steel temperature and the time in the step 4) are firstly drawn, and the curve relationship between the atomizing water pressure and the atomizing time is fitted; and according to the curve relation between the atomization water pressure and the angle of the second stop valve, correlating the curve relation between the atomization water pressure and the angle of the second stop valve and the curve relation between the atomization water pressure and the atomization time to obtain the curve relation between the atomization time and the angle of the second stop valve.
9. The method of claim 7, wherein the output water pressure of the second stop valve is: controlling the water pressure to be 17.5-17.6MPa within 0-60 min; controlling the water pressure to be 17.75-18.5MPa in 60-65 min; controlling the water pressure at 19.1-20.1MPa within 65-70 min; the water pressure is controlled at 20.1-20.5MPa in 70-75 min.
10. The method for regulating and controlling the pressure of atomized water based on the temperature of water atomized molten steel as claimed in claim 6, wherein in the step 3), the temperature of the molten steel in the tundish is measured and recorded every 1-20 minutes.
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