JP2873178B2 - Aging method and apparatus for steelmaking slag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for artificially swelling steelmaking slag containing unlime lime (free lime) discharged from a converter or an electric furnace in a short time by using steam. The present invention relates to a method and an apparatus for aging a product applicable as a roadbed material on an industrial scale.

[0002]

2. Description of the Related Art Steelmaking slag generated in a steelmaking process is hard and has an angular shape on the surface, so that it meshes well during road compaction and is excellent as a roadbed material. It has the property. However,
In the steelmaking slag, part of quicklime used as a de-P / S-removing agent remains as unslagged lime (free lime) without completely bonding with other molecules. When used as a roadbed material, a hydration reaction occurs with the passage of time, which causes swelling and collapse, which may cause adverse effects such as ground uplift. Therefore, conventionally, when used for roadbed materials and the like, it is used after aging for completing the expansion / collapse phenomenon and stabilizing the use. For example, as a conventional steelmaking slag aging method and apparatus, the following are known,
Each technique has its drawbacks, and satisfactory aging techniques have not yet been provided.

[0003] Japanese Patent Application Laid-Open No. 60-101441 proposes a method in which what has been allowed to stand naturally for three to six months can be greatly reduced by blowing a high-temperature gas containing water vapor. However, since the treatment is performed while exposing to the atmosphere, and because the method is performed by blowing a high-temperature gas containing a gas (air) other than water vapor, the treatment is not yet performed.
Processing time of 8 hours or more is required.

Japanese Patent Application Laid-Open No. 63-201043 proposes a method in which slag is put into a container such as a hopper for treatment, but by using a device such as a rotary feeder which has a relatively weak pressure sealing performance. The application of high-pressure steam is not considered. Therefore, the slag treated in the container must be left outdoors for a certain period. Therefore, the slag aging period, which conventionally required about two months, can only be reduced to about half a month.

Japanese Patent Application Laid-Open No. 63-260842 proposes a method in which steam is blown into a slag surrounding side and bottom surfaces. However, since the top surface is open or covered with a simple lid, the steam temperature is reduced. Therefore, the aging period can only be shortened to about 1 to 3 weeks.

Japanese Patent Application Laid-Open No. 3-159938 proposes a method of performing aging with saturated steam and hot water while switching between two or more slag tanks. Is about 80 ° C., and the aging time is about 8 to 24 hours.

Japanese Patent Application Laid-Open No. 4-202033 proposes a method of aging using high-pressure steam. However, since high-pressure steam is ejected to slag stored in an atmospheric pressure atmosphere, high-pressure steam is used. Enthalpy is utilized only, and the temperature of high-pressure steam is not sufficiently utilized, and therefore, the aging time is not significantly reduced.

Japanese Unexamined Patent Publication No. Hei 4-202034 proposes a method of combining natural aging and steam aging, but requires a preceding natural aging period of 1 to 3 months and a steam aging period of about 10 hours. The total processing time has not been reduced.

Japanese Unexamined Patent Publication No. Hei 5-17182 discloses that aging can be completed in about one minute by immersing slag in water and applying ultrasonic waves on a scale of about a glass beaker. However, on an industrial scale, the thickness of the slag layer on the belt conveyor must be increased, so that practical use is difficult.

[0010] Japanese Patent Application Laid-Open No. Hei 6-92696 discloses 100
Although treatment with steam at a high temperature of at least ℃ has been proposed,
It can be said that the slag does not reach a sufficiently high temperature due to the low water vapor partial pressure due to the inclusion of other gases such as carbon dioxide, and thus the condensation temperature of the water vapor is low, and the hydration reaction of the water vapor is sufficiently promoted. Absent. It has been shown that by mixing carbon dioxide gas, the aging time can be reduced to about 4 hours. However, both a water vapor source and a carbon dioxide source must be prepared, and There is a problem that it becomes acidic when dissolved in condensed water and corrodes the apparatus.

Japanese Patent Application Laid-Open No. 6-92697 proposes a method of aging with water having a pressure of 1.2 kg / cm ² G or more instead of water vapor. Even if the hot water between the slag particles and in the fine voids inside the particles is lower than the condensation temperature, the hot water tends to accumulate as it is, and is not easily replaced by hot water having a high temperature close to the condensation temperature.

Therefore, it is not possible to make full use of the increase in the condensing temperature due to the increase in pressure, so that an aging time of about 12 hours is required.

Japanese Patent Application Laid-Open No. 6-127984 discloses that slag, which has just been discharged from a steelmaking smelting furnace and has just been solidified, is filled with hot slag in a pressure vessel and sprayed with water. Although a method of performing both has been proposed, it is necessary to convey an extremely high temperature solid of about 1000 ° C., which requires heat resistance of the conveying equipment,
In addition, since uncrushed large lumps of slag are charged into the pressure vessel, there is a problem that the pressure vessel wall and the sealing surface of the opening / closing lid are easily damaged, and smooth operation cannot be performed.

Japanese Patent Application Laid-Open No. Hei 5-238786 proposes an aging method in which slag is charged into a pressure-resistant container in a sealed state, and the container is kept in a steam atmosphere under pressure by supplying pressurized steam. According to the method, aging is described by maintaining a pressure of about ² kg / cm ² G for only 3 hours. However, a method for industrially applying this aging method on a large scale,
In particular, there is no specific method for handling a large amount of hot water generated at the time of heating and pressurizing the inside of the container by steam, and a person skilled in the art cannot easily carry out the method.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make a steelmaking slag artificially swell in a short period of time using steam to reduce the possibility of road slag. It is an object of the present invention to provide a method and an apparatus for aging a product applicable as a roadbed material on an industrial scale. It is another object of the present invention to provide a method and an apparatus for aging steelmaking slag that do not wear the apparatus.

[0016]

In order to achieve the above-mentioned object, the present invention provides a pressure vessel containing room-temperature steelmaking slag crushed so that particles having a particle size of 25 mm or less become 80% or more. The pressure vessel is closed, and pressurized steam is supplied into the vessel to heat the vessel and the slag, thereby discharging the condensed hot water and raising the temperature and pressure in the pressure vessel. Then, the pressure inside the vessel is 2 to 10 kg / cm. ^{1 to 2} G saturated steam atmosphere
After holding for 5 hours, the first invention is a method for aging steelmaking slag characterized by discharging the steelmaking slag by reducing the pressure in the pressure vessel to the atmospheric pressure and sealing the pressure vessel in the first invention. Thereafter, before supplying the pressurized steam into the container, the hot water generated in the previous process in the pressure container or the hot water generated in another pressure container connected to be communicable is supplied to the pressure container, and Aging method of steelmaking slag characterized by performing drainage while preheating the slag as the second invention, in the first invention,
A plurality of pressure vessels are connected in a communicable manner, and the pressure is reduced to atmospheric pressure by discharging steam from above the pressure vessel, and the discharged steam is supplied to another pressure vessel to preheat the other pressure vessel and slag. The third invention is a method for aging a steelmaking slag characterized by performing drainage while draining, and in the first, second or third invention, the inside of the vessel is 2 to 10
In the step of maintaining a saturated steam atmosphere at a pressure of kg / cm ² G, a method for aging steelmaking slag characterized by temporarily lowering the pressure in the vessel is defined as a fourth invention, and in the fourth invention, A plurality of pressure vessels are connected so that they can communicate with each other, and by supplying saturated steam from another pressure vessel in the heat retaining step to the pressure vessel at the start of temperature rise / pressure rise, the pressure in the other pressure vessel is temporarily reduced. Aging method of steelmaking slag characterized by lowering the fifth invention, the first, second, third, in the fourth or fifth invention, in a state where the steelmaking slag is housed in an unsealed container, The aging method of steelmaking slag characterized by performing the charging into the pressure vessel and discharging from the pressure vessel as the sixth invention, the first, second, third, fourth, fifth or sixth of the present invention In the invention, saturated water The aging method of steel slag, wherein the gas pressure is 5 kg / cm ² G or more and a seventh invention, the first, second, third, fourth, fifth, sixth or seventh In the invention, the aging method for steelmaking slag is characterized in that a single charging amount of the steelmaking slag into the pressure vessel is 10 to 50 tons, and in the eighth invention, A ninth aspect of the present invention is a method for aging steelmaking slag, wherein the processing time from charging to discharging of the steelmaking slag to the steelmaking slag is 2 to 6 hours. A method for aging a steelmaking slag according to the tenth invention, wherein the time from discharging the steelmaking slag to be aged to the pressure vessel is 10 minutes or more and less than 30 minutes. In the ninth invention, The eleventh invention is directed to a method for aging steelmaking slag, wherein the temperature rising and pressure-up time is 30 minutes to 2 hours, and a pressure vessel having an opening / closing lid for charging and discharging the steelmaking slag. The steam generator is connected with a pipe having a valve, a pipe having hot water discharge means is connected to the lower part of the pressure vessel, and a pipe opened to the atmosphere having a valve is connected to the upper part of the pressure vessel,
A twelfth invention is directed to a steelmaking slag aging device comprising a means for charging slag into the pressure vessel and a means for discharging slag from the pressure vessel, and in the twelfth invention, A thirteenth invention is directed to a steelmaking slag aging device, wherein the steelmaking slag charging / closing lid and the discharge opening / closing lid are independent of each other. A fourteenth invention is directed to a steelmaking slag aging device characterized by providing a slag collection means immediately before the opening / closing lid for use, and in the twelfth invention, the opening / closing lid is used for charging and discharging the steelmaking slag. A fifteenth invention is directed to a steelmaking slag aging device characterized in that the aging device is constituted by a single lid that is also used as the lid. A sixteenth aspect of the present invention is a steelmaking slag aging device characterized by having a simple structure, and in the sixteenth aspect, a chute having a smaller diameter than the pressure vessel opening is pressured to the pressure vessel side where the clutch door is detached. A seventeenth invention is directed to a steelmaking slag aging device characterized in that it is provided so as to slightly protrude from the vessel flange seal surface. In the twelfth invention, in the twelfth invention, hot water discharge from a pipe connected to a lower portion of the pressure vessel is provided. Subsequently to the means, a hot water storage container is arranged, the hot water storage container and the upper part of the pressure vessel are connected by a pipe having hot water supply means, and another pipe for hot water discharge is provided at the lower part of the pressure vessel. An eighteenth invention is directed to a steelmaking slag aging device characterized by being connected to the pipe, wherein the untreated slag storage means is provided in front of the slag charging means in the twelfth invention, and is connected to a lower portion of the pressure vessel. Road hot water drainage The steelmaking slag aging device is characterized in that a hot water storage container is arranged following the means, and a pipeline is provided from the hot water storage container to the untreated slag storage means via the hot water supply means. According to a nineteenth aspect, in the twelfth aspect, the pressure vessel comprises a plurality of pressure vessels, and the upper and lower parts of each of the pressure vessels are connected by pipes so that they can communicate with each other. A twentieth invention is a steelmaking slag aging device, characterized in that a valve is provided on the upper side, and a hot water discharge means and a valve are provided on the lower side of each pressure vessel of the connection pipeline.
In the twelfth invention, the pressure vessels are composed of a plurality of pressure vessels, and the upper portions of the respective pressure vessels are connected by pipes so as to be able to communicate with each other, and valves are provided on the pressure vessel upper sides of the connection pipes. The aging device for steelmaking slag is characterized by the twenty-first invention, and in the twelfth invention, a plurality of pressure vessels having a common steam generator are connected by a pipe so as to be able to communicate with each other, The aging device for steelmaking slag, characterized in that a valve other than a check valve is provided on the upper side of each pressure vessel of the connection pipe line as the twenty-second invention, and in the thirteenth or fifteenth invention, Wherein the slag charging means comprises a conveying means capable of transferring the unsealed vessel containing the steelmaking slag into the pressure vessel and a slag supply means, and the slag discharging means comprises a pressure vessel comprising the unsealed vessel containing the steelmaking slag. Can be transported outside According to a twenty-third aspect of the present invention, there is provided a steelmaking slag aging apparatus characterized by comprising a conveying means and a slag emptying means, and in the twenty-third invention, the number of unsealed vessels is a pressure vessel. The twenty-fourth invention is an aging apparatus for steelmaking slag characterized in that it is only one more than the number of the steelmaking slags. The steelmaking slag aging device characterized by having a vent hole is the twenty-fifth invention, and in the twenty-third, twenty-fourth, or twenty-fifth invention, on the bottom surface of the non-closed container, The steelmaking slag aging device characterized by the provision of a large number of drain holes as the twenty-sixth invention, in the twenty-third, twenty-fourth, twenty-fourth or twenty-sixth inventions, The side of the unsealed container can be deformed according to the swelling pressure of the slag The aging device for steelmaking slag characterized by having been manufactured in the twenty-seventh invention, and in the twenty-third, twenty-fourth, twenty-fifth, twenty-six, or twenty-seventh inventions, The pressure vessel is a horizontal cylinder, two rails are laid in the longitudinal direction of the cylinder in the pressure vessel, and the transport means is capable of traveling in a direction orthogonal to the cylinder. And another trolley that can travel on two rails laid in the same direction so that it can be connected from the inner rail, and slag supply means and slag emptying means are respectively mounted on the traversing carriage. An aging device for steelmaking slag characterized by having two rails laid in the same direction so as to be able to transit from the laid two rails as the invention of the twenty-eighth invention; 24, 25, 26 or In the twenty-seventh aspect, the pressure vessel is a vertical cylinder, an opening / closing lid is provided on the upper surface of the cylinder, and the transporting means is configured by a hoist crane device capable of suspending a non-closed container and vertically moving and traversing. The invention of claim 29, wherein the aging device for steelmaking slag is characterized in that the two rails respectively provided in the slag supply means and the slag emptying means move in the left-right direction. The twelfth invention is directed to a steelmaking slag aging device characterized in that it is possible, wherein the twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, 19th, 20th, 21st, 21st, 22nd, 23rd, 24th, 25th, 26th, 27th, 28th, 28th, 2nd In the nineteenth or thirtieth invention, the inner wall of the pressure vessel or the non-closed vessel may be horizontally or diagonally downward. Only by the aging device of steel slag, characterized in that a rib thirty-first invention.

[0017]

The operation of the present invention will be briefly described as follows. The steelmaking slag crushed so that the particle size of 25 mm or less becomes 80% or more is charged into a pressure vessel and sealed. Then, pressurized steam is supplied into the pressure vessel. Then, the contact surface of the slag and the container with the steam becomes substantially equal to the condensation temperature of the steam, and the steam heats the slag and the container while releasing latent heat of condensation, thereby generating hot water substantially equal to the condensation temperature. While discharging the hot water, the temperature of the slag and the container is increased, and the pressure in the container is increased. Eventually, when the pressure in the container becomes substantially equal to the pressure of the supplied steam, the pressure is maintained for a certain time. After holding for a certain period of time, the water vapor in the container is released to the atmosphere, the pressure in the container is reduced to atmospheric pressure, and the aging ends.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail along with their functions and effects.

[Embodiment 1] This embodiment relates to a technology for aging steelmaking slag while discharging condensed hot water while heating slag with pressurized steam in a closed vessel. The outline of the equipment is as shown in FIG. Referring to FIG. 1, 1 is a pressure vessel, 2a is an openable top cover, 2b is an openable bottom cover, 3 is a steam generator, and the steam generator 3 and the pressure vessel 1 are a pipeline 5 having a valve 4. Connected by Reference numeral 6 denotes a steelmaking slag charging chute, and a conveyor 8 is interposed between the chute 6 and a steelmaking slag crushing device 7. A pipe 10 having a steam trap 9 is connected to a lower portion of the pressure vessel 1.
A pipe 12 having a valve 11 is connected to an upper portion of the pressure vessel 1. Reference numeral 13 denotes a slag container for storing the slag after aging. A method of aging steelmaking slag by the apparatus having the above-described configuration will be described with reference to FIG. 1 and FIG. 2 showing a pressure change and a temperature change in each step.

(1) Loading Step The upper lid 2a of the pressure vessel 1 is opened, and the
The steelmaking slag crushed so that the slag of 5 mm or less becomes 80% or more is passed from the chute 6 through the conveyor 8 to the pressure vessel 1.
, And the upper lid 2a is closed and sealed. (Time required t _i ) (2) Heating / Pressurizing Step Open the valve 4 and obtain 2 to 10 kg / cm from the steam generator 3.
² G steam is supplied to the pressure vessel 1. Then, the contact surface of the slag and the container with the steam becomes almost equal to the condensation temperature of the steam (saturation temperature T _s ), and the steam heats the slag and the container while releasing latent heat of condensation, and the contact surface reaches the condensation temperature. Approximately equal hot water is generated. This hot water is discharged from the lower part of the pressure vessel 1 through a pipe 10 having a steam trap 9 so that the hot water does not stay in the pressure vessel 1. (Required time t _p ) (3) Insulation process Since the steam consumption decreases as the temperature of the slag and the container increases, the internal pressure P _{S of} the container gradually increases and is eventually supplied from the steam generator 3. A saturated steam atmosphere having a pressure of ² to 10 kg / cm ² G substantially equal to steam is obtained. In this state, the supply of steam is continued for 1 to 5 hours. (Required time t _S ) (4) Depressurization step Next, the valve 4 is closed, the valve 11 is opened, and the pressure vessel 1
The water vapor in the pressure vessel 1 is released to the atmosphere from the upper part of the vessel through the pipe 12 to reduce the pressure in the vessel to atmospheric pressure. (Required time t _d ) (5) Discharge step Finally, the lower lid 2b of the pressure vessel 1 is opened, and the slag in the pressure vessel is accommodated in the slag vessel 13. (Time required t _o ) Thereafter, the above steps 1 to 5 are repeated.

The features of the first embodiment configured as described above will be described below.

(1) Aging is completed in a very short time by holding slag in saturated steam of ² kg / cm ² G or more. This is because the high-pressure steam penetrates into the voids between the particles and within the particles to perform the condensation heat transfer. Therefore, even the very small voids have substantially the same pressure, and the condensation temperatures are also substantially equal. Condensation heat transfer has a much higher heat transfer rate than convection heat transfer, so the contact surface temperature is approximately equal to the condensing temperature whether the steam is saturated or slightly overheated.

(2) Discharge of hot water is extremely important for smooth aging with high-pressure steam on an industrial scale. The reason is as follows. a. When slag is immersed in the pressure vessel due to stagnation of hot water, the heat transfer of condensation is hindered, the rate of temperature rise of the slag decreases, and the aging time (t _S ) increases. b. The slag immersed in the low-temperature condensed water generated in the initial stage of the temperature-raising / pressure-raising process cannot come into contact with the high-temperature / high-pressure steam, so the temperature rise is insufficient, and the hydration reaction takes time. c. As shown in FIG. 3, the solubility of slaked lime (Ca (OH) ₂ ) generated in the hydration reaction in water is rather decreased as the temperature rises. If hot water having a low concentration of slaked lime and having a high concentration of slaked lime generated at the beginning of the heating process is retained in the pressure vessel, the hot water is mixed with the hot water generated as the heating proceeds, and the average temperature (T _W ) Increases, so that the solubility decreases, and an excess amount of slaked lime precipitates, causing a problem that it sticks and grows on the container wall. This problem can be solved by the method of the present invention in which hot water is discharged simultaneously with the supply of steam in the temperature raising / pressurizing step. In the heat retaining step, the average temperature of the slag and the container (T
_C ) also rises considerably, and the amount of generated hot water (S) is commensurate with the amount of heat released through the heat insulating layer on the outer surface of the container. In addition, the hot water temperature is high and the temperature fluctuation is small. There is no particular problem even if it is not discharged. In addition, although there is no particular problem on aging even if drainage is performed in the heat retention process, the noise when hot water of high temperature and high pressure is discharged is loud,
White smoke is generated and thermally damaged.

The steelmaking slag to be used as a raw material in the present invention includes converter slag, reduced slag and oxide slag from an electric furnace,
And a mixture of the above, and a portion of quicklime added as a de-P or S-removing agent during refining does not bond with other molecules, and unslagged lime (free lime) remains. When used as a material, hydration reaction occurs over time to form slaked lime,
In the past, swelling and collapsing caused problems such as ground uplift, so conventionally, it was left alone for several months and naturally aged.

Therefore, the present invention is to solve such a problem by providing a technique capable of performing this aging in a short time and efficiently. Next, in the present invention, the slag temperature, The reasons for limiting the particle size of slag, the pressure of steam, and the heat retention time are described below.

(1) In principle, the raw material slag is that at room temperature. Although it may be slightly heated for preheating, etc., it should be at a temperature at which it can be conveyed by a belt conveyor or the like, that is, at most 200 ° C., and is a high temperature slag of about 1000 ° C. which has just been discharged from a furnace and solidified. Is not preferred.

(2) The particle size of the raw material slag is preferably crushed to a maximum of 25 mm according to the standard of the roadbed material. Due to the collapse of the particles during aging, it may be slightly larger than this, but it is preferable that the particles having a size of 25 mm or less be crushed so as to be 80% or more. If the particle diameter of the slag is too large, the hydration reaction of the quicklime inside the particles becomes difficult as the quicklime in the surface layer of the particles becomes slaked lime, and the aging time may be prolonged.

(3) The saturation temperature of steam is determined by the steam pressure, and the higher the temperature, the faster the hydration reaction. Therefore, the higher the steam pressure, the better. Therefore, in order to perform aging efficiently, it is preferable that the pressure of the water vapor is 2 kg / cm ² G or more. However, as shown in FIG. 4, this hydration reaction (C
The equilibrium constant K _P of aO + H ₂ O → Ca (OH) ₂ ) decreases as the temperature increases, and becomes negative at 450 ° C. or higher. Rather, slaked lime is decomposed and the reaction to generate quick lime proceeds. This indicates that at high temperatures close to 450 ° C., the reaction progresses rapidly, but the proportion of free lime that eventually undergoes a hydration reaction decreases, and the product cooled to room temperature may still swell. . Also, with increasing pressure,
Since the amount of increase in the saturation temperature with respect to the amount of increase in pressure is small and the pressure vessel becomes expensive, the pressure of steam is 10 kg /
It is preferably set to cm ² G or less.

(4) As disclosed in JP-A-5-238786, 6.1% free lime and 3% swelling ratio
When the slag is treated, the required time (t _S ) of the heat retaining step under the condition of P _S = 2 kg / cm ² G is 3 hours. According to the results of the present inventors, the swelling rate of 6% of the slag is separately ^{_{experiments, P S = 5kg / cm 2}} G condition of incubating process of time required (t _s) was 2 hours. Although it depends on the composition of the slag and the pressure conditions, in view of these results, it is preferable that the heat retention time be 1 hour or more and 5 hours or less in consideration of economy.

[Embodiment 2] This embodiment relates to a technique of reusing the container and the slag for preheating after discharging the hot water condensed in the first embodiment. As shown in FIG. 5, an outline of the equipment is obtained by adding the following equipment to the equipment shown in FIG. The hot water storage container 14 is installed following the steam trap 9, and the hot water storage container 1 is further installed.
Subsequent to 4, a pump 16 and a valve 17 are installed in a pipe 15 and connected to the upper part of the pressure vessel 1. Another pipe 18 is connected to the lower part of the pressure vessel 1, and the pipe 18 is provided with a valve 19.

A method of aging steelmaking slag by the apparatus having the above-mentioned configuration will be described with reference to FIG. 5 and FIG. 6 showing a pressure change and a temperature change in each step.

(1) Charging Step The operation is the same as in the first embodiment.

(2) Hot water preheating step In the previous processing, the steam trap 9
The hot water discharged and stored in the hot water storage container 14 is pumped by the pump 16 and supplied to the upper portion of the pressure container 1 through the pipe 15 to spray water on the slag in the container. At the same time, the valve 19 is opened, and the hot water flowing down in the slag layer is discharged to the outside of the pressure vessel through the pipe 18.

(Required time t _P1 ) (3) Heating / Pressurizing Step The valve 4 is opened and the same operation as in the first embodiment is performed. (Required time t _p2 ) However, the hot water discharged from the steam trap 9 is stored in the hot water storage container 14.

(4) Insulation Step The operation is the same as in the first embodiment.

(5) Decompression Step The operation is the same as that in the first embodiment.

(6) Discharging Step This is the same operation as in the first embodiment.

The effect of the second embodiment configured as described above will be described below.

(1) Sensible heat of hot water can be recovered as a preheating source. (2) Since the slag can be washed with hot water to remove a part of the fine powder which is likely to flow out, troubles such as clogging of the steam trap 9 hardly occur. (3) As the temperature of hot water drops by preheating the slag, the solubility of slaked lime increases as shown in Fig. 3.
Slaked lime is less likely to precipitate and stick in the pressure vessel. In the hot water storage container 14, since the hot water flowing in later is higher in temperature, the average temperature may increase. However, the temperature is suppressed to 100 ° C. or less due to the atmospheric pressure, and the temperature fluctuation width is small. Moreover, even if slaked lime adheres, the countermeasure is easy because the container is a normal pressure container. [Embodiment 3] The present embodiment relates to a technique of reusing slag for preheating after discharging the hot water condensed in Embodiment 1 described above. As shown in FIG. 7, the outline of the equipment is obtained by adding the following equipment to the equipment shown in FIG. Following the steam trap 9, the hot water storage container 14
Is installed, and the hot water storage container 14 is followed by the pipe 1
5a is provided with a pump 16 and a valve 17, and a pipe 15a is provided.
The slag storage container 20 before aging in front of the chute 6
The conveyor 8a is installed between the slag storage container 20 and the chute 6.

A method of aging steelmaking slag by the apparatus having the above-mentioned configuration will be described with reference to FIG.

(1) Charging Step A steam trap 9 was placed from the lower part of the pressure vessel 1 in the previous treatment.
The hot water discharged and stored in the hot water storage container 14 is pumped by the pump 16 through the pipe 15a,
Water is sprinkled into the slag storage container 20 for accommodating the crushed steel slag so that those having a particle size of 25 mm or less become 80% or more in the crushing device 7. At the same time, the hot water is discharged from the lower part of the slag storage container 20 to the outside of the container 20 through the conduit 21. Then, the upper lid 2a of the pressure vessel 1 is opened, and the preheated slag is charged into the pressure vessel 1 via the conveyor 8a and the chute 6,
The upper lid 2a is closed and sealed.

(2) Heating / Pressurizing Step The operation is the same as in the first embodiment.

(3) Insulation Step The operation is the same as in the first embodiment.

(4) Decompression Step The operation is the same as that of the first embodiment.

(5) Discharging Step This is the same operation as in the first embodiment.

The effect of the third embodiment constructed as described above is that the sensible heat of hot water can be used as a preheating source, as in the second embodiment, and that troubles such as clogging of a steam trap can be prevented as a slag cleaning effect. In addition to the effect, the preheating by the hot water can be completed in a place different from the pressure vessel by the start of the charging step, so that the time required for the hot water preheating step in the case of the second embodiment (t _P1 , FIG. 6) can be expected to reduce the processing time (t _t ) for one cycle.

[Embodiment 4] In this embodiment, a plurality of pressure vessels are used, and the upper and lower parts of the plurality of pressure vessels are connected so as to be able to communicate with each other, and hot water generated in one pressure vessel is used in another pressure vessel. It is related to technology that can be passed through. As shown in FIG. 8, the outline of the equipment includes a plurality of pressure vessels (1,
1a), the lower part and the upper part of one adjacent pressure vessel 1 are connected by a pipe 25 having a valve 22, a steam trap 23 and a valve 24, and the lower part and the upper part of another pressure vessel 1a. Are connected by a pipe 25a having a valve 22a, a steam trap 23a, and a valve 24a, and the pipes 25 and 25a are connected by a pipe 26.

A method of aging steelmaking slag by the apparatus having the above-mentioned configuration will be described with reference to FIG. 8 and FIG. 9 showing a temperature change in the process.

(1) Charging Step Using a belt conveyor 8b having a movable tripper as a charging means, the tripper is moved directly above the pressure vessel 1, and
The steelmaking slag crushed by the crushing device 7 so that the one having a particle size of 25 mm or less becomes 80% or more is charged into the pressure vessel 1,
The pressure vessel 1 is sealed.

(2) Hot Water Preheating Step The valve 24 in the pipe 25 communicating with the upper part of the pressure vessel 1 is opened, and the hot water discharged from another pressure vessel in the heating / pressurizing step described later is passed through a pipe 27. , 26, and into the upper part of the pressure vessel 1, the hot water flowing down while preheating the slag layer is opened by opening the valve 28 below the vessel to form the steam trap 9
Discharged from (Required time t _P0 ) (3) Heating / Pressurizing Step The pressure vessel 1 is heated / pressurized by the same method as in the first embodiment, and the hot water discharged from the lower part of the vessel is opened by opening the valve 22, After passing through 25 and 26, the valve 24a is opened and passed into the upper part of the pressure vessel 1a in the hot water preheating step. In addition,
At the start stage of the heating / pressurizing step, the pressure in the vessel is low, so if steam is supplied from the same steam generator 3 as the other pressure vessel that is starting the heat retaining step, the other high pressure vessel There is a possibility that the water vapor in the inside may flow into the pressure vessel 1 or 1a, and the other pressure vessels may lower the temperature and pressure, thereby hindering the progress of the heat retaining step. In order to prevent this problem from occurring, in this embodiment, the check valve 2 is provided immediately before the valves 4 and 4a.
9, 29a are provided.

(4) Insulation Step The operation is the same as that in the first embodiment.

(5) Decompression Step The operation is the same as that of the first embodiment.

(6) Discharging Step This is the same operation as in the first embodiment.

The effect of the fourth embodiment having the above structure is that the hot water storage container is not required and the hot water of 100 ° C. or more (atmospheric pressure or more) can be used for preheating as it is. Even when the preheating effect is large and the capacity of the steam generator 3 is limited, sufficient preheating can lead to a reduction in the time required for temperature rise and pressure increase, thereby shortening one aging time ( _tt ). Can be expected.

[Embodiment 5] In this embodiment, a plurality of pressure vessels are used, the upper portions of the plurality of pressure vessels are connected so as to be able to communicate with each other, and hot water generated in one pressure vessel is passed through another pressure vessel. It is related to the technology that can be entered. As shown in FIG. 10, an outline of the equipment includes a plurality of pressure vessels (1, 1a).
...), The upper portions of the adjacent pressure vessels 1 and 1a are connected to each other by a pipe 30, and each pressure vessel 1, 1
Valves 31 and 31a are respectively provided on the upper part of a.

A method for aging steelmaking slag by the apparatus having the above-mentioned configuration will be described with reference to FIG. 10 and FIG. 11 showing pressure changes in the steps.

(1) Charging Step This is the same operation as in the fourth embodiment.

(2) Steam Preheating Step The steam discharged from the other pressure vessel in the depressurization step described later is passed into the pressure vessel 1 by opening the valve 31.
Preheat the slag and vessel and pre-pressurize the vessel. The condensed water generated at this time is discharged from the lower part of the pressure vessel 1 through the steam trap 9 to the outside of the vessel through the pipe 10.

(3) Heating / Pressurizing Step The operation is the same as in the first embodiment.

(4) Heat-retaining step The same operation as in Example 1 is performed.

(5) Depressurization Step The valve 31 at the upper part of the pressure vessel 1 is opened, the water vapor in the vessel is released to the pipeline 30, and the valve 31 a is opened to supply steam to the pressure vessel 1 a in the steam preheating step. . After the pressure vessels 1 and 1a are equalized and the steam stops flowing, the valves 31 and 31a are closed, the valve 11 is opened to release steam from the pipe 12 to the outside, and the internal pressure of the pressure vessel 1 is reduced to the atmospheric pressure. Reduce pressure.

(6) Discharging Step This is the same operation as in the first embodiment.

The effects of Embodiment 5 configured as described above are as described below. (1) The steam discharged in the decompression step can be used as a preheating source. (2) A significant part (70-90%) of the heat supplied in the temperature raising / pressurizing step and the heat retaining step is used for raising the sensible heat of the slag and vessel, and 10-20% of the amount of hot water is increased. The amount of heat stored as heat and remaining as high-pressure steam in the container is small. Therefore, even if only the water vapor remaining in the container is recovered, the merit of heat recovery is small. As a decompression method,
If steam is discharged from above the pressure vessel,
In particular, hot water staying at the bottom evaporates and is blown up,
Since the steam is superheated and discharged after contacting the slag particles and the inner wall of the container, the amount of heat recovery increases.

(3) Since the temperature of the slag discharged in the discharging step is reduced, it is easy to handle the product slag.

(4) Since the discharge of water vapor to the outside of the system is after the pressure in the container has been reduced to some extent, there are few problems such as noise and generation of white smoke.

Sixth Embodiment In the operation of the first embodiment, the present invention relates to a technique for temporarily lowering the pressure during the heat retaining step. The outline of the equipment is the same as that shown in FIG. 1, and the pressure change in the process is as shown in FIG. 12, and the aging method will be described below.

(1) Charging Step The operation is the same as in the first embodiment.

(2) Heating / Pressurizing Step The operation is the same as in the first embodiment.

(3) Insulation Step The valve 11 is opened for a short time during the same heat retention as in the first embodiment, and the steam in the pressure vessel 1 is released to instantaneously slightly reduce the pressure in the pressure vessel 1. Is performed once or more. Note that the total time of the heat retaining step without opening the valve 11 is 1
The time must be longer than 5 hours.

(4) Decompression Step The operation is the same as that of the first embodiment.

(5) Discharging Step This is the same operation as in the first embodiment.

The effects of the sixth embodiment configured as described above are as described below. (1) When the slag contains a large amount of particles having a large particle diameter, the temperature of the central part of the particles does not easily rise, and when Ca (OH) ₂ develops on the surface of the particles, the CaO in the central part is hardly water. May not react. In such a case, especially when the particles are porous, if the pressure is rapidly reduced during the heat retaining step, the high-pressure steam or hot water in the slag particles expands and expands the particle voids when blowing out of the particles. , Possibly causing the particles to disintegrate. For this reason, the central part of the particles where the hydration reaction has not progressed at a low temperature is exposed to water vapor, and aging proceeds rapidly.

[Embodiment 7] The present invention relates to a technique in which a plurality of pressure vessels are provided and these plurality of vessels are connected so as to be able to communicate with each other. The equipment configuration is the same as that shown in FIG. 10 except that the check valves (29, 29)
a) correspond to those having valves (4, 4a,...). FIG. 13 is a diagram showing the pressure change.

A method for aging steelmaking slag with the apparatus having the above-described configuration will be described.

[0075] At least two of the plurality of pressure vessels are
The processing is performed so that the aging processing steps are shifted by one step. That is, when the pressure vessel 1 starts to increase and decrease the temperature, the aging process is performed as if another pressure vessel 1a communicating with the pressure vessel 1 is in the middle of the heat retaining step. As a result, the pressure vessel in the middle of the warming process is slightly reduced in pressure instantaneously.

The effect of the seventh embodiment is, in addition to the effect of the sixth embodiment, that the steam discharged in the heat retaining step is collected in another pressure vessel, so that the heat efficiency is improved, and the noise and white noise are reduced. It also has the effect of reducing smoke problems.

[Embodiment 8] This embodiment relates to a technique for aging steelmaking slag contained in an unsealed container in a horizontal cylindrical pressure vessel. The equipment configuration is shown in FIG.
This is as shown in FIG. Referring to FIG. 3, reference numeral 32 denotes a horizontal cylindrical pressure vessel, in which two rails 33 are laid in the longitudinal direction in the pressure vessel 32, and a traversing carriage 34 extends in a direction perpendicular to the longitudinal direction of the pressure vessel 32. It can travel on two rails 35 laid on the rail.

On the traversing carriage 34, there is arranged a lifting carriage 37 which can travel on two rails 36 laid in the same direction so as to be able to connect to the rail 33. Reference numeral 38 denotes an unsealed basket, which is filled with steelmaking slag. 39 is a receiving frame, and 40 is a payout frame.

A method for aging steelmaking slag with the apparatus having the above-described configuration will be described.

(1) Charging Step The steelmaking slag crushed by the crushing apparatus so that the slag having a particle size of 25 mm or less has a particle size of 80% or more is transported by a transporting means such as a belt conveyor or the like, and is placed on the deposit table 41 of the receiving frame 39. Is loaded in the basket 38 placed in the. Reference numeral 42 denotes two rails, which are laid in the same direction so as to be able to connect to the rail 36. Next, the traversing carriage 34 is moved on the rail 35 and moved to the front of the receiving frame 39. Then, the lift cart 37 is caused to travel on the rail 36 to be transferred from the rail 36 to the rail 42, and is moved below the slag-filled basket 38.

The slag-filled basket 38 is lifted from the deposit table 41 by the lifter 43 provided on the lift truck 37, and the lift truck 37 is moved backward to remove the basket 38.
Is transferred onto the traversing carriage 34.

Next, the trolley 34 is moved to the front of the pressure vessel 32. The lid 44 of the pressure vessel 32 is opened, the lift carriage 37 is advanced, and the rail 36 is connected to the rail 33, and the slag-filled basket 38 is charged into the pressure vessel 32. The lifter 43 is lowered, the basket 38 is placed on the depositing stand 45 in the pressure vessel 32, the lift truck 37 is retracted, the lid 44 is closed, and the pressure vessel 32 is sealed.

(2) Heating / Pressurizing Step The operation is the same as in the first embodiment.

(3) Insulation Step The operation is the same as in the first embodiment.

(4) Decompression Step The operation is the same as that of the first embodiment.

(5) Discharge Step The lid 44 of the pressure vessel 32 is opened, the traversing carriage 34 is moved to the front of the pressure vessel 32, and the lift carriage 37 is moved forward to place the trolley under the basket 38 filled with the aged slag. Then, the lifter 43 is moved up, and the basket 38 is lifted from the depository 45. Next, the lift cart 37 is moved backward to transfer the basket 38 onto the traversing cart 34, and the traversing cart 34 is moved to the front of the payout frame 40. In the payout frame 40, two rails 46 are laid in the same direction so that the rails 36 can be connected to each other. The lift truck 37 is advanced to connect the rails 36 to the rails 46, and the lifter 43 is connected. The basket 38 filled with the aged slag is lowered and placed on the deposit table 47 of the payout frame 40.

Then, the aged slag is discharged by a payout device such as a basket reversing device, and the basket 38 is emptied.

The effects of the eighth embodiment configured as described above are as described below. (1) Since the slag is stored not in the pressure vessel but in an unsealed basket, the space between the basket and the pressure vessel is filled with saturated steam, and sufficient heating is performed. (2) The hot water generated by heating the vessel flows down almost without contacting the slag, and the temperature rise of the slag is not hindered. (3) The slag is hard and highly wearable, but it is housed in a basket and does not damage the pressure vessel wall due to impact or wear. When repairing a pressure vessel, advanced technology is required under laws and regulations in consideration of safety aspects,
The basket that directly contacts the slag may be a non-pressure-resistant container,
Some damage can be tolerated and repair is easy.
Also, even if spare parts are prepared and replaced at relatively low cost, the cost burden is small. (4) If the pressure vessel is directly filled with slag, the slag adheres to the sealing surface of the flange of the lid, causing leakage of water vapor, and the cleaning of the sealing surface takes time, and the time required for opening and closing the lid increases. There is a possibility that one aging time becomes longer. However, if the basket is filled with slag, such a problem does not occur. (5) If the pressure vessel is directly filled with slag, the pressure vessel may be deformed by the swelling pressure of the slag due to aging, but if the pressure vessel is housed in an unsealed basket,
There is no problem even if the basket is slightly deformed, and repair is easy. (6) If the slag swells in the pressure vessel, it may solidify and become difficult to discharge, or the discharge time may be prolonged and one aging time may be prolonged. However, such a problem does not occur if it is housed in an unsealed basket and taken in and out of the pressure vessel.

(7) Since the slag is charged and discharged while being stored in the basket, there is no need to worry about contamination even if the lid is used as a clutch door.

(8) Since the lid is provided on the side, even if the clutch door is applied, there is no fear of contamination.

[Embodiment 9] This embodiment relates to a technique for aging steelmaking slag stored in an unsealed container in a vertical cylindrical pressure vessel. Fig. 16 ~
This is as shown in FIG. Referring to the figure, 48 is a vertical cylindrical pressure vessel, 49 is an unsealed basket, 50
Is a hoist crane device. The hoist crane device 50 can freely move in the direction (X direction) or the direction (Y direction) perpendicular to the trolley 51 by running the trolley 51 along the rails 52 and 53. It is.

A method for aging steelmaking slag with the apparatus having the above-described configuration will be described.

(1) Charging Step The steelmaking slag crushed by the crushing apparatus so that the slag having a particle size of 25 mm or less has a particle size of 80% or more is transported by a transporting means 54 such as a belt conveyor and the like, and a deposit table 56 of a receiving frame 55. It is loaded into the basket 49 placed on top. The slag-filled basket 49 is lifted by the hoist crane device 50, and the trolley 51 is moved along the rails 52 and 53 to be moved directly above the pressure vessel 48. The hoist crane device 50 is lowered, the lid 57 of the pressure vessel 48 is opened, the slag-filled basket 49 is inserted into the pressure vessel 48, the hoist crane apparatus 50 is raised, and the lid 57 is closed to close the pressure vessel 48. Seal tightly.

(2) Heating / Pressurizing Step The operation is the same as in the first embodiment.

(3) Insulation Step The operation is the same as in Example 1.

(4) Depressurization Step The operation is the same as in Example 1.

(5) Discharging Step The lid 57 of the pressure vessel 48 is opened, the trolley 51 is moved directly above the pressure vessel 48, and the basket 4 filled with the slag subjected to the aging treatment by the hoist crane device 50.
Lift 9 Then, the trolley 51 is paid out and the frame 5 is provided.
8 and is placed on a depository 59 provided on a payout frame 58. Then, the openable bottom opening device 60 of the basket 49 is opened, and the aged slag is discharged.

According to the ninth embodiment configured as described above, in addition to the effects of the eighth embodiment, since the basket containing the slag is lifted by the hoist crane device, the charging and discharging can be performed only by the upper lid. Since it can be used for both purposes, the effect that there is no fear of dirt even when the clutch door is applied can be expected.

[Embodiment 10] This embodiment relates to an aging method in a case where the number of baskets is one more than the number of pressure vessels, and will be described below. (1) In the case of a horizontal cylinder In FIGS.
One basket is more than the number of, while one basket is performing the heating / pressurizing, warming and depressurizing processes, the other basket is performing the discharging / charging process and filling the slag for the next time. Prepare for the aging process.

(2) In the case of a vertical cylinder In FIGS.
Prepare one more than the number. One basket 49a filled with the slag aged in the pressure vessel 48 is placed on the depositing stand 59 of the dispensing frame 58 to prepare for slag discharge (see FIG. 19). During this time, the aging-treated slag is discharged, and another basket 49b filled with untreated slag is charged and sealed in the empty pressure vessel by discharging the basket 49a. After the heating / pressurizing step of the pressure vessel into which the basket 49b is loaded, the aging-treated slag is discharged from the basket 49a placed on the depository 59, and the basket 49a is discharged according to the procedure shown in FIG.
Is filled with unprocessed slag and waits. Eventually, when the temperature raising / pressurizing, heat retaining, and depressurizing steps of one pressure vessel have been completed and the basket 49c filled with the aged slag has been moved to the deposit stand 59 of the payout frame 58, the basket 49a is replaced with the basket 49a. The pressure vessel emptied by discharging 49c is charged and sealed in the pressure vessel, and the temperature is increased and the pressure is increased.

According to the tenth embodiment configured as described above, the following effects are expected. The charging / discharging process is shortened, and the processing time for one cycle is shortened. Even if the slag solidifies due to swelling and takes a long time to discharge, there is almost no effect on the processing time. Since sufficient time for charging and discharging the basket can be ensured, the capacity of the belt conveyor / crusher (the processing amount per unit time) can be reduced.

[Embodiment 11] This embodiment is different from Embodiment 8 in that the rail 46 of the payout frame 40 and the receiving frame 39 are provided.
The rail 42 has a structure that can be moved left and right by a hydraulic cylinder or the like, and the unprocessed slag and the processed slag are transported by a trackless free-running vehicle.

That is, the rails 46 are opened to the left and right, a trackless free-running vehicle such as a dump truck with a lifter enters under the basket 38 filled with the treated slag, and the basket 38 is deposited by the lifter provided on the vehicle. The slag is discharged by lifting the vehicle from 47 to the product storage area. Next, the empty basket is filled with raw material slag using a trackless free-running loading machine such as a shovel loader, and the dump truck is allowed to travel to the receiving frame 39. Then, the rail 42 is opened to the left and right, the dump truck enters the receiving frame 39, the lifter is lowered, and the basket 38 filled with untreated slag is placed on the deposit table 41. Thereafter, the same operation as in the eighth embodiment is performed. Execute

According to the eleventh embodiment configured as described above, the following effects can be obtained.

The construction of a permanent supply / discharge means such as a belt conveyor and a hopper is unnecessary, and the initial investment is small. Since a trackless vehicle that can travel freely is used, the layout of the equipment can be freely set, and the flexibility in changing the equipment is high. Conventionally, aging of steelmaking slag has been carried out by being piled up in a large space and allowed to stand naturally for several months to one year, so that trackless vehicles such as dump trucks and shovel loaders already exist in many cases. In such a case, the existing equipment can be effectively used, which is advantageous.

[Embodiment 12] In this embodiment, FIGS.
As shown in FIG.
2 is provided, and a shelf plate 63 inclined downward is provided on the inner wall of the container (see FIG. 20), or a cover plate 64 that covers the ventilation hole 62 is provided.
(See FIG. 21) or a part 65 of the side surface 61.
Is bent (see FIG. 22) so that the free surface 66 of the slag layer determined by the angle of repose of the slag is below the ventilation hole 62.

With such a configuration, there is an effect that the water vapor spreads over the entire slag layer and aging proceeds rapidly. Since the basket is a non-pressure-resistant container, there is no problem even if such a vent is opened.

Embodiment 13 In this embodiment, as shown in FIG. 23, a large number of drain holes 68 are provided on the bottom surface 67 of the basket, and a bottom plate 69 is provided below the drain holes 68.
The bottom plate 69 is extended sufficiently outside the limit position 70 where the slag that has fallen downward from the side spreads at the angle of repose. With this configuration, there is an effect that the hot water generated in the slag layer is quickly drained out of the layer, and aging proceeds rapidly. Since the basket is a non-pressure-resistant container, there is no problem even if such a hole is formed.

[Embodiment 14] In this embodiment, as shown in FIG. 24, a side wall 71 of a basket is supported by a hinge 72,
By the action of the counterweight 73, even if the slag 74 is filled in the basket, the side wall 71 is prevented from being expanded by the powder pressure, and a large force such as the swelling pressure 75 when the slag swells due to aging. When added, the side wall 71 is configured to be expanded. With this configuration, it is possible to prevent the basket from being damaged due to swelling of the slag.
Since the basket is a non-pressure-resistant container, there is no problem even with such a non-sealed structure.

Next, another embodiment of the pressure vessel will be described with reference to FIGS.

FIG. 25 shows a cover for charging untreated slag,
An example is shown in which the lid for discharging the treated slag and the lid are independent of each other. Reference numeral 76 denotes a dust valve serving as an upper lid that opens and closes for charging untreated slag, and the upper lid is not likely to cause a decrease in hermeticity due to adhesion of slag powder.
A single-stage dust valve was used. However, since the lower lid is considered to be largely affected by slag powder adhesion, the lower lid is constituted by a two-stage dust valve of a drain receiving valve 77 and a gas seal valve 78, and a non-pressure-resistant slag cut valve 79 is provided thereon. . Therefore, the slag directly contacts the gas seal valve 78,
Since the hot water mixed with the slag powder can be prevented from coming into contact with the slag powder, the sealing performance is further improved. Therefore, an excessive amount of time is not required for cleaning and inspection when opening and closing the lid.
In the pressure vessel configured as described above, charging of untreated slag and discharging of treated slag can be performed in the following procedure.

(1) If the untreated slag is charged after opening the dust valve 76 as the upper lid, it is possible to prevent the upper lid from being stained.

(2) When discharging the treated slag, first, the gas seal valve 78 is opened, and then the drain valve 77 is opened.
Then, the hot water flows down, but the gas seal valve 78 is already opened and is not contaminated. Finally, the slag cut valve 79 is opened. At this time, the drain valve 77 and the gas seal valve 78 are already open, and are not contaminated by slag. Further, since a plurality of ribs 80 are provided in the horizontal direction on the inner wall of the pressure vessel in FIG. 25, the filled slag 81 forms a surface layer as shown in FIG. 82 results. Therefore, even if the slag swells due to aging, the slag rises in this gap, so that the swelling pressure is released and the swelling pressure applied to the pressure vessel is reduced.

FIG. 26 shows an example in which slag collecting means is provided immediately before the treated slag discharge cover. In the figure, since the lower part of the pressure vessel is formed to be thick, the possibility that the slag is fixed is reduced. Because it is difficult to make the dust valve large, it is usual to make the lower part of the pressure vessel thin.On the other hand, if the slag swells due to aging, it becomes difficult to discharge when the slag swells. There is a possibility that. However, as shown in FIG. 26, if the screw feeder 83 is provided as a collection means, it is not necessary to make the lower part of the pressure vessel thin, and the problem of slag fixation does not occur.
Also, since a primary sealing effect by the screw feeder can be expected, the dust valve 84 on the discharge side may be one stage.

Further, since a plurality of ribs 85 are provided obliquely downward on the inner wall of the pressure vessel in FIG. 26, the filled slag hardly comes into contact with the inner wall of the vessel, and the swelling pressure on the pressure vessel is reduced. Is even larger than in the case of the horizontal ribs in FIG. Further, compared to horizontal ribs, it is less likely to hinder slag discharge. Rib 8 above
Even if 0 or 85 is provided on the inner wall of the non-closed basket, the effect of reducing the swelling pressure can be expected.

FIG. 27 is a view showing an example in which a single lid 86 is used for charging unprocessed slag and discharging the processed slag. The lid 86 is a clutch door, and the pressure vessel 87
Is configured to be upside down. The diameter of the clutch door can be made larger than that of the dust valve, opening and closing can be easily and reliably performed in a short time, and the pressure sealing property is high. However, the adhesion of dust is hardly permissible, so that cleaning and inspection may take time, which causes a problem in the discharging process. Therefore, the pressure vessel is made upside down, and in the discharging step, first, when the lid 86 is at an upper position (the position on the right side in the figure), the lid 86 is opened, and then the pressure vessel 87 is turned over and the lid 86 is moved downward (see FIG. If the treated slag is discharged in such a manner as to be located at the left side of the drawing), the cover 86 can be prevented from being stained.

FIG. 28 shows a state in which the clutch door is located on the pressure vessel side.
An example in which a chute 88 having a smaller diameter than the pressure vessel opening is provided so as to slightly protrude from the pressure vessel flange sealing surface 89 is shown.

With this configuration, it is possible to prevent not only the lid 86 but also the flange 90 of the pressure vessel from being stained.

Finally, the reasons for limiting the lower limit value of the saturated steam pressure, the amount of slag to be processed, and the processing time during the heat retaining step in the present invention will be described below.

[Lower limit value of saturated steam pressure] First, as described above, the lower limit value of the saturated steam pressure during the heat retaining step was 2 kg / cm ² G for a slag having a swelling ratio of 3%.
(As described in JP-A-5-238786) is 3 hours, and the inventor of the present invention has an expansion coefficient of 6%.
Was 2 hours when treated at a steam pressure of 5 kg / cm ² G. From this, it was found that increasing the steam pressure shortens the aging time. A possible to be applied equal to the range of 5 kg / cm ² G steam Considering the facility cost surface is in the range of 5 to 10 kg / cm ² G, the range is effective in shortening the aging time.

[Slag Processing Amount] Regarding the slag processing amount, when processing slag on an industrial scale, it is preferable that as much slag as possible can be processed at once.
However, if the amount to be treated at one time is excessive, the charging process, the heating / pressurizing process, and the discharge There is a problem that the time for the process and the like becomes long.
Therefore, the required production capacity (for example, 1000 tons per day)
In order to secure the pressure, it is necessary to increase the capacity of the pressure vessel, and the effect of shortening the aging time (the time required for the heat retaining step) is reduced. Alternatively, if it is intended to prevent the time of the charging step, the heating / pressurizing step, the discharging step, etc. from becoming excessively long, a raw material slag processing / supplying facility such as a steam source, a crushing facility, a product slag conveying facility, etc. Has to be large and is not economical. Therefore, considering handling of a basket by a hoist crane device, a trolley, a dump truck, or the like, the amount of slag to be charged into the pressure vessel in one process is considered to be appropriate in the range of 10 to 50 tons.

If a larger capacity is required, it is appropriate to increase the number of pressure vessels.

[Processing Time] It is economical that the processing time for one treatment is 2 to 6 hours. For example, one processing amount is 4
Assuming 0 tons, one processing time is 4 hours, and the number of pressure vessels is 4, 40 tons / (base · 4 hours) × 24 hours ×
4 units = 960 tons is the daily production capacity. The time of the charging step and the discharging step is a dead time in which the internal pressure of the pressure vessel must be brought to the atmospheric pressure, and should be shortened as much as possible to improve the net operability of the pressure vessel. However, for safety,
It is preferable to secure at least 10 minutes, and it is economical to set the upper limit to less than 30 minutes.

The time required for the temperature raising / pressurizing step is determined by the capacity of the steam source, preheating and the like. If the pressure vessel is reduced in size and the radix is increased, the amount of steam at the peak can be reduced. In the case where the throughput per processing is 40 tons, the steam generating capacity of the steam source for raising and raising the temperature to 5 kg / cm ² G in one hour is only about 2 tons / hour. Therefore, it is economical to set the time of the temperature raising / pressure raising step to 30 minutes or more and 2 hours or less.

[0125]

Since the present invention is configured as described above, the following effects can be obtained. (1) In the invention according to Claims 1 and 12, aging proceeds efficiently by increasing and decreasing the temperature while discharging hot water, and there is no problem that excess slaked lime adheres to the inner wall of the container. Aging is completed in a very short time.

(2) According to the second and eighteenth aspects, the sensible heat of hot water can be recovered as a preheating source, so that energy costs can be reduced. In addition, since untreated slag can be washed and fine powder that easily flows out can be removed, troubles such as steam trap blockage are less likely to occur. Since the temperature of the hot water drops by preheating the slag, and the solubility of slaked lime increases, the risk of slaked lime sticking to the inner wall of the container is reduced.

(3) In the invention according to claims 2 and 19, in addition to the effect of claim 18, by performing preheating at a place different from the pressure vessel, the entire processing time is reduced by the time of the preheating step. There is an effect that can be shortened.

(4) In the invention according to the second and twentieth aspects, in addition to the advantage that the hot water storage container becomes unnecessary, hot water of 100 ° C. or more can be used for preheating, and the preheating effect is large. In the case where the capacity of the steam generator is limited, by performing sufficient preheating, there is a possibility that the time for raising and lowering the temperature is shortened, and the time for one treatment is shortened.

(5) According to the third and twenty-first aspects of the present invention, the steam discharged in the pressure reduction step can be used as a preheating source, and the amount of heat recovery increases. Since the temperature of the slag discharged in the discharging step is reduced, it is convenient for handling the product slag. Since the discharge of water vapor to the outside of the system is after the pressure in the container has decreased to some extent, there are few problems such as noise and white smoke.

(6) According to the fourth aspect of the present invention, when the high-pressure steam or hot water in the slag particles expands due to the reduced pressure and blows out of the particles, the particle voids are pushed and expanded, and in some cases, the particles are disintegrated. . For this reason, at a low temperature, the central part of the particles where the hydration reaction has not progressed is exposed to water vapor, and aging proceeds rapidly.

(7) In the invention according to claims 5 and 22, in addition to the effect of the above-mentioned claim 4, there is an effect that the steam discharged in the heat retaining step is collected in another pressure vessel and is not wasted. There is also an effect that there are few problems of noise and white smoke.

(8) The invention according to claims 6, 23 and 28 has the following effects. That is, since the slag is housed in an unsealed basket and charged into the pressure vessel, the space between the basket and the pressure vessel is filled with saturated steam, and sufficient heating is performed. Hot water generated by heating the pressure vessel flows down almost without contacting the slag,
Does not hinder the temperature rise of the slag. Since the basket in direct contact with the slag is a non-pressure-resistant container, slight damage is allowed and repair is easy. When the slag is directly filled in the pressure vessel, the slag adheres to the sealing surface of the lid portion, and the sealing surface is troublesome. However, if the slag is stored in a non-sealed basket, such a problem does not occur. Even if the basket is slightly deformed by the swelling pressure of the slag, there is no problem, and the repair is easy. When the pressure vessel is directly filled with slag, if the slag swells, it may solidify and become difficult to discharge, but such a problem does not occur if the slag is stored in an unsealed basket.

(9) In the invention according to claims 6, 23, and 29, the same effects as those of the above-mentioned claims 6, 23, and 28 can be expected, and since a vertical container is used, the required area of the equipment is small. Help me.

(10) According to the seventh aspect of the invention, the aging time can be shortened.

(11) According to the eighth aspect of the invention, the effect that the aging equipment is economical can be expected.

(12) According to the ninth, tenth, and eleventh aspects of the invention, the aging process can be efficiently executed with an economical equipment scale.

(13) According to the thirteenth aspect, the sealing property of the pressure vessel is improved.

(14) According to the fourteenth aspect of the present invention, the risk of slag sticking in the pressure vessel is reduced, and it does not take a long time to discharge the slag.

(15) In the invention according to claim 15, an effect of reducing equipment costs can be expected.

(16) According to the sixteenth aspect of the present invention, the lid is not stained and has excellent sealing properties.

(17) According to the seventeenth aspect, since the lid and the flange portion on the pressure vessel side can be prevented from being stained, the sealing performance is improved.

(18) According to the twenty-fourth aspect, the charging / discharging process is shortened, and the processing time for one cycle is shortened.
Even when the slag solidifies due to swelling and takes a long time to discharge, there is almost no effect on the processing time.

(19) According to the twenty-fifth aspect of the present invention, it is expected that the effect is obtained that the steam spreads over the entire slag and aging proceeds rapidly.

(20) According to the twenty-sixth aspect, it is expected that the hot water generated in the slag layer is quickly drained out of the slag layer, and aging proceeds rapidly.

(21) According to the twenty-seventh aspect, breakage of the non-closed container due to swelling of the slag can be prevented.

(22) According to the twenty-eighth aspect of the present invention, since the lid is provided on the side, an effect that there is no fear of contamination even when the clutch door is applied can be expected.

(23) In the invention according to claim 29, the unsealed container is lifted by a hoist crane, and the pressure container can serve both for charging and discharging the slag with one upper cover. An effect that there is no fear of contamination even when applied can be expected.

(24) The invention according to claim 30 has the following effects. In other words, there is no need to construct a permanent supply / discharge means such as a belt conveyor and a hopper, so that initial investment is reduced. Since a trackless vehicle that can travel freely is used, the layout of the equipment can be freely set, and the flexibility for change is high. Existing trackless vehicles can be used effectively.

(25) In the invention according to the thirty-first aspect, a void is formed under the rib, and even if the slag swells due to aging, the slag rises in the void, so that the swelling pressure is released and the pressure is released. The effect of reducing the swelling pressure applied to the container can be expected.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a steelmaking slag aging apparatus of the present invention.

FIG. 2 is a diagram schematically showing a pressure change and a temperature change during aging.

FIG. 3 is a diagram showing a solubility curve of slaked lime.

FIG. 4 is a diagram showing a temperature change of an equilibrium constant of a hydration reaction.

FIG. 5 is an overall configuration diagram showing another embodiment of the steelmaking slag aging apparatus of the present invention.

6 is a diagram schematically showing a pressure change and a temperature change during aging by the apparatus of FIG.

FIG. 7 is an overall configuration diagram showing still another embodiment of the steelmaking slag aging apparatus of the present invention.

FIG. 8 is an overall configuration diagram showing still another embodiment of the steelmaking slag aging apparatus of the present invention.

9 is a diagram schematically showing a temperature change during aging by the device of FIG.

FIG. 10 is an overall configuration diagram showing still another embodiment of the steelmaking slag aging apparatus of the present invention.

11 is a diagram schematically showing a pressure change during aging by the device of FIG. 10;

FIG. 12 is a diagram schematically showing a pressure change when the pressure in the pressure vessel is temporarily reduced during the heat retaining step.

FIG. 13 is a diagram schematically showing a pressure change when two pressure vessels are connected to each other.

FIG. 14 is a plan view of still another embodiment of the aging apparatus for steelmaking slag of the present invention.

FIG. 15 is a front view of the apparatus of FIG. 14;

FIG. 16A is a sectional view of a pressure vessel accommodating an unsealed basket, and FIG. 16B is a side view of the basket.

FIG. 17 is a front view of still another embodiment of the aging apparatus for steelmaking slag of the present invention.

FIG. 18 is a plan view of the device of FIG. 17;

FIG. 19 is a side view of the device of FIG. 17;

FIG. 20A is a cross-sectional view showing an example in which a shelf plate that covers holes on the side surfaces of a basket is provided, and FIG. 20B is a front view thereof.

FIG. 21A is a cross-sectional view showing an example in which a cover plate that covers holes on the side surfaces of the basket is provided, and FIG. 21B is a front view thereof.

FIG. 22A is a cross-sectional view showing an example in which a part of the side surface is bent so as to cover a hole on the side surface of the basket;
(B) is a front view thereof.

FIG. 23 is a cross-sectional view showing an example in which a bottom plate is provided below a drain hole on the bottom surface of the basket.

FIG. 24 is a cross-sectional view showing an example in which the side surface of the basket has a deformable structure.

FIG. 25 is a side sectional view showing another example of the pressure vessel.

FIG. 26 (a) is a front view showing another example of the pressure vessel, and FIG. 26 (b) is a side sectional view thereof.

FIG. 27 is a schematic configuration diagram showing still another example of the pressure vessel.

FIG. 28 is a schematic configuration diagram showing still another example of the pressure vessel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pressure vessel 2a ... Upper lid 2b ... Lower lid 3 ... Steam generator 4 ... Valve 5 ... Pipe line 6 ... Charging chute 7 ... Crushing apparatus 9 ... Steam trap 10 ... Pipe line 11 ... Valve 12 ... Pipe line 13 ... Slag Vessel 14 ... Hot water storage vessel 15 ... Pipe 15a ... Pipe 16 ... Pump 18 ... Pipe 20 ... Slag container before aging 21 ... Pipe 22 ... Valve 22a ... Valve 23 ... Steam trap 23a ... Steam trap 24 ... Valve 24a ... Valve 25 ... Pipe 25a ... Pipe 26 ... Pipe 30 ... Pipe 31 ... Valve 31a ... Valve 32 ... Pressure vessel 33 ... Rail 34 ... Traversing trolley 35 ... Rail 36 ... Rail 37 ... Lift trolley 38 ... Basket 42 ... Rail 46 ... Rail 48 ... Pressure container 49 ... Basket 50 ... Hoist crane device 57 ... Lid 62 ... Ventilation hole 63 ... Shelf plate 64 Cover plate 68 Drain hole 73 Counterweight 76 Dust valve 77 Drain receiving valve 78 Gas seal valve 79 Slug cut valve 80 Rib 83 Screw feeder 85 Rib 86 Lid 87 Pressure vessel 88: Chute 89: Flange seal surface

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiichi Komai 3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Yoshitaka Kinukawa Higashi-Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo 3-1-1 1-1 Kawasaki Heavy Industries, Ltd. Kobe Factory (56) References JP-A-6-206743 (JP, A) JP-A-5-238786 (JP, A) JP-A-8-59307 (JP, A (58) Fields investigated (Int. Cl. ⁶ , DB name) C04B 5/00 F27D 15/00

Claims (31)

(57) [Claims] 1. A normal-temperature steelmaking slag crushed so that particles having a particle size of 25 mm or less become 80% or more is charged into a pressure vessel, the pressure vessel is closed, and pressurized steam is supplied into the vessel to produce a vessel. The pressure inside the pressure vessel is raised and pressurized while discharging hot water condensed by heating the slag, and then the inside of the vessel is placed in a saturated steam atmosphere at a pressure of ² to 10 kg / cm ² G for 1 to 10 kg / cm ² G.
A method for aging steelmaking slag, which comprises holding for 5 hours, reducing the pressure in the pressure vessel to atmospheric pressure, and discharging the steelmaking slag. 2. After sealing the pressure vessel and before supplying pressurized steam into the vessel, hot water generated in a previous process in the pressure vessel or hot water generated in another pressure vessel communicably connected to the pressure vessel. And supplying water to the pressure vessel to preheat the vessel and slag to perform drainage.
The aging method of the steelmaking slag described. 3. A plurality of pressure vessels are connected in a communicable manner, and the pressure is reduced to the atmospheric pressure by discharging steam from above the pressure vessel, and the discharged steam is supplied to another pressure vessel to supply the other pressure vessels. The aging method for steelmaking slag according to claim 1, wherein drainage is performed while preheating the slag. 4. The method according to claim 1, wherein the pressure in the container is temporarily reduced in the step of maintaining the inside of the container in a saturated steam atmosphere at a pressure of ² to 10 kg / cm ² G. Aging method for steelmaking slag. 5. A pressure vessel connected to a plurality of pressure vessels so as to be able to communicate with each other, and by supplying saturated steam from another pressure vessel in a heat retaining step to a pressure vessel at the start of heating and pressurization, the pressure inside the other pressure vessel is increased. The method for aging steelmaking slag according to claim 4, wherein the pressure is temporarily reduced. 6. The steelmaking according to claim 1, wherein the steelmaking slag is charged into and discharged from the pressure vessel while the steelmaking slag is housed in an unsealed vessel. Aging method for slag. 7. The method for aging steelmaking slag according to claim 1, wherein the saturated steam pressure is 5 kg / cm ² G or more. 8. The method according to claim 1, wherein a single charge of the steelmaking slag into the pressure vessel is 10 to 50 tons.
The aging method for steelmaking slag according to 2, 3, 4, 5, 6, or 7. 9. The aging method for steelmaking slag according to claim 8, wherein a processing time from charging to discharging of the steelmaking slag to the pressure vessel is 2 to 6 hours. 10. The time from discharging the aged steel slag to charging the steel slag to be aged into the pressure vessel and sealing it is 10 minutes or more and less than 30 minutes. Item 10. The method for aging steelmaking slag according to Item 9. 11. The method for aging steelmaking slag according to claim 9, wherein the temperature raising and raising time is 30 minutes to 2 hours. 12. A pressure vessel having an opening / closing lid for charging and discharging a steelmaking slag and a steam generator are connected by a pipeline having a valve, and a pipeline having a hot water discharge means below the pressure vessel. And a means for charging a slag to the pressure vessel and a means for discharging the slag from the pressure vessel by connecting a pipe open to the atmosphere having a valve above the pressure vessel. Aging equipment for steelmaking slag. 13. The aging apparatus for steelmaking slag according to claim 12, wherein the opening / closing lid for charging the steelmaking slag and the opening / closing lid for discharging are independent of each other. 14. The aging device for steelmaking slag according to claim 13, wherein a slag collection means is provided immediately before the opening / closing lid for discharging the steelmaking slag. 15. The aging device for steelmaking slag according to claim 12, wherein the opening / closing lid is constituted by a single lid that also serves as charging and discharging of steelmaking slag. 16. The pressure vessel according to claim 1, wherein the opening / closing lid is a clutch door, and the pressure vessel has a structure which can be turned upside down.
5. The aging device for steelmaking slag according to 5. 17. The steelmaking slag according to claim 16, wherein a chute having a diameter smaller than that of the pressure vessel opening is provided on the pressure vessel side where the clutch door is attached and detached so as to slightly protrude from the pressure vessel flange sealing surface. Aging device. 18. A hot water storage container is disposed following the hot water discharge means of a pipe connected to the lower part of the pressure vessel, and the hot water storage vessel and the upper part of the pressure vessel are connected by a pipe having hot water supply means. 13. The aging apparatus for steelmaking slag according to claim 12, wherein another pipe line for discharging hot water is connected to a lower portion of the pressure vessel. 19. An untreated slag storage means is provided in front of the slag charging means, and a hot water storage vessel is arranged following the hot water discharge means in a pipe connected to a lower portion of the pressure vessel. 13. The aging apparatus for steelmaking slag according to claim 12, wherein a pipe is provided to reach the untreated slag storage means via hot water supply means. 20. A pressure vessel comprising a plurality of pressure vessels, upper and lower portions of each of the pressure vessels are connected by pipes so as to be able to communicate with each other, and a valve is provided on an upper side of each pressure vessel of the connection pipe. 13. The aging apparatus for steelmaking slag according to claim 12, wherein a hot water discharge means and a valve are provided on a lower side of each pressure vessel of the connection pipe. 21. A pressure vessel comprising a plurality of pressure vessels, and upper portions of these pressure vessels are connected by a pipe so as to be able to communicate with each other;
13. The aging apparatus for steelmaking slag according to claim 12, wherein a valve is provided on an upper side of each pressure vessel of the connection pipe. 22. A plurality of pressure vessels having a common steam generating device are connected by pipes so as to be able to communicate with each other, and a valve excluding a check valve is provided on an upper side of each pressure vessel in the connection pipe. The steelmaking slag aging device according to claim 12, characterized in that: 23. A slag charging means comprising a conveying means capable of transferring an unsealed container containing steelmaking slag into a pressure vessel and a slag supply means, and a slag discharging means comprising an unsealed steelmaking slag containing steelmaking slag. The steelmaking slag aging device according to claim 13 or 15, comprising a conveying means capable of transferring the container out of the pressure vessel and a slag emptying means. 24. The aging apparatus for steelmaking slag according to claim 23, wherein the number of unsealed vessels is one more than the number of pressure vessels. 25. The aging apparatus for steelmaking slag according to claim 23, wherein a number of ventilation holes are provided on a side surface of the non-sealed container. 26. The aging apparatus for steelmaking slag according to claim 23, wherein a plurality of drain holes are provided on a bottom surface of the non-sealed container. 27. The aging device for steelmaking slag according to claim 23, wherein the side surface of the unsealed container has a structure capable of being deformed in accordance with the swelling pressure of the slag. 28. The pressure vessel is a horizontal cylinder, and two rails are laid in a longitudinal direction of the cylinder in the pressure vessel, and the transport means is capable of traveling in a direction orthogonal to the cylinder. And another trolley that can run on two rails laid in the same direction so as to be connectable from the rail in the cylinder, and the slag supply means and the slag emptying means are respectively 3. The vehicle according to claim 2, further comprising two rails laid in the same direction so as to be transitable from the two rails laid on the traversing carriage.
28. The aging device for steelmaking slag according to 3, 24, 25, 26 or 27. 29. The pressure vessel is a vertical cylinder, an opening / closing lid is provided on the upper surface of the cylinder, and the conveying means is constituted by a hoist crane device which can lift and lower and traverse a non-sealed container. Claims 23, 24, and 2
28. The aging device for steelmaking slag according to 5, 26 or 27. 30. The aging apparatus for steelmaking slag according to claim 28, wherein two rails of each of the slag supply means and the slag emptying means are movable in the left-right direction. 31. The pressure vessel or the non-closed vessel has a rib provided on the inner wall in a horizontal or obliquely downward direction.
7, 18, 19, 20, 21, 22, 23, 24, 2
The aging device for steelmaking slag according to 5, 26, 27, 28, 29 or 30.