JPH09118549A - Method for aging steelmaking slag and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the heating and pressurizing effect by pressurized steam and to improve the efficiency of aging by releasing the steam mingled with the air accumulated in a pressure vessel to the outside of this pressure vessel at the time of aging steelmaking slag by the satd. steam in the pressure vessel. SOLUTION: The method for aging the steelmaking slab contg. the non- slag-off lime discharged by a converter, electric furnace, etc., by rapidly and artificially swelling the slag by utilizing the steam is outlined below: The method comprises putting the steelmaking slag of ordinary temp. pulverized in such a manner that the grains having <=25mm grain size attains >=80%, supplying the pressurized steam, discharging the hot water condensed by pressurization simultaneously therewith, then holding the inside of the vessel at the satd. steam atmosphere of 2 to 10kg/cm<2> G pressure for 1 to 5 hours, thereafter, discharging the steam in the vessel to reduce the pressure down to the atm. pressure, thereby discharging the steelmaking slag from the vessel. The steam mingled with the air accumulated in the pressure vessel is released outside the vessel in the heating up and pressure increasing stage and the heat insulating stage of the satd. steam atmosphere in the method described above.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Steelmaking slag is produced by combining components that are no longer required during melting and refining of metal. Since the slag is hard crystalline, it is cooled to a predetermined particle size after cooling. The crushed material is suitable as a roadbed material, and is widely and generally used.

[0003] However, in the steelmaking slag, part of the quicklime used as a de-P / S-removing agent during the refining does not react and remains as unslagized lime (free lime). It has the property of expanding upon hydration when it reacts with water. For this reason, if the unslagized lime is used for a roadbed material in a state where it remains in the slag, a hydration reaction occurs with the passage of time, and as a result, the ground may expand, protrude, and collapse.

Therefore, conventionally, in order to use steelmaking slag as a roadbed material, aging is performed in advance to cause a hydration reaction of unslagified lime artificially to complete expansion and collapse phenomena. Was used as.

As the above aging method, the present applicant has already disclosed in Japanese Patent Application No. Hei 6-307713 the heat and excess moisture of steam in a sealable pressure vessel and by using pressurized high-temperature pressurized steam. The present invention provides a method and an apparatus for aging a steelmaking slag, which can accelerate the hydration reaction of unsmelted lime in the steelmaking slag and perform aging in a shorter time than before. That is, a steelmaking slag pulverized to a predetermined particle size is charged into a pressure vessel, and pressurized steam is supplied to the pressure vessel to increase the pressure and temperature in the pressure vessel to maintain a saturated steam atmosphere. , Under these conditions,
It is disclosed that a steelmaking slag is swollen to promote hydration reaction of unslagified lime in the steelmaking slag to perform aging.

[0006]

However, in the aging method described above, when charging steelmaking slag into a pressure vessel,
Since the lid of the pressure vessel is open, inside the pressure vessel,
The volume of the pressure vessel is filled with air together with the slag, and the air is retained in the gap between the charged slags. In this state, when the pressure vessel is closed and pressurized steam is supplied into the pressure vessel, the air initially present in the pressure vessel and the moisture in the pressurized steam take heat to the slag and the pressure vessel. Low-humidity air (hereinafter, referred to as “air-mixed steam”) after being separated into hot water and separated (hereinafter referred to as “air-mixed steam”) is accumulated in the lower part of the pressure vessel because of its higher density than pressurized steam. The air and the steam mixed with the air prevent the pressurized steam supplied to the pressure vessel from heating and pressurizing the lower part of the pressure vessel.

[0007] Accordingly, the uniform rise and fall of the pressure inside the pressure vessel are hindered, and the hydration reaction of the steelmaking slag charged in the lower part of the pressure vessel is inhibited, so that the operating time of the entire aging is also lost. Was occurring.

Further, Japanese Patent Application No. 6-307713 discloses a method of selectively aging by connecting a plurality of the above-mentioned pressure vessels, but in this method, the pressure inside the pressure vessel which has been aged first is disclosed. In order to supply the saturated steam discharged at the time of decompression as a part of the pressurized steam to the pressure vessel to be subsequently aged, each time the above-mentioned air and air-mixed steam generated in both pressure vessels undergo aging. As it increases, the loss of hydration and operating time is
This was larger than when the pressure vessel was used independently.

Further, hot water is intermittently discharged from a pipe line connected to a lower portion of the pressure container when the pressure container is heated / pressurized or kept warm. However, the hot water has a high temperature and is not accumulated. Calcium hydroxide generated by the hydration reaction of fossil lime dissolves in, and the solubility of calcium hydroxide decreases as the temperature increases, so that calcium hydroxide changes to a crystalline state near the pipeline each time hot water is discharged. And precipitates, thereby impairing the pipeline function. Therefore, it has been necessary to remove the precipitated calcium hydroxide every time the aging is repeated.

[0010] When the slag, which has been aged in the pressure vessel, is collectively discharged to the dispensing pit, the non-closed container for transporting the slag is positioned above the dispensing pit, and the bottom of the non-closed container is closed. By opening it, the aged steelmaking slag was discharged from above the payout pit. However, the collision between the falling slag and the slag with the payout pit surface and the collision between the slags generated a large amount of dust, which was not preferable.

[0011]

The present invention has been made in order to achieve the above-mentioned problems and objects, and the gist of the constitution is as follows.

That is, normal temperature steelmaking slag crushed so that particles having a particle size of 25 mm or less become 80% or more is charged into (1) a pressure vessel, (2) the pressure vessel is sealed, and pressurized water is introduced into the vessel. Steam is supplied, hot water that is condensed by pressurizing the pressure vessel and slag at the same time is discharged from the pressure vessel, and by continuing this, the temperature and temperature of the pressure vessel are raised and boosted.
(3) The vessel is kept in a saturated steam atmosphere at a predetermined pressure of ² to 10 kg / cm ² G for 1 to 5 hours. (4) After that, the steam inside the pressure vessel is discharged to increase the pressure inside the pressure vessel. After reducing the pressure to atmospheric pressure, (5) In the aging method of discharging the steelmaking slag from the pressure vessel, the air-mixed steam that accumulates inside the pressure vessel during the heating / pressurizing step in the pressure vessel and the heat retaining step in the saturated steam atmosphere This is an aging method for steelmaking slag in which is discharged outside the pressure vessel.

The release of the air-mixed steam is appropriately adjusted depending on time, temperature or pressure. That is, as a control method based on time, the air-
It is preferable to release for up to 60 minutes, especially about 10 to 30 minutes.

As a control method based on pressure conditions,
It is preferable to release the air-mixed steam from the time when the internal pressure of the pressure vessel reaches 1 kg / cm ² G, and the internal pressure of the pressure vessel is higher than the predetermined pressure of the pressurized steam supplied to the pressure vessel.
It is preferred to release until a preset pressure of 50% or more and 95% or less is reached.

Further, as a control method according to the temperature condition,
It is preferable to release when the difference between the temperature of the air-mixed steam and the saturation temperature of the steam at the internal pressure of the pressure vessel 1 becomes 5 ° C. or more, and the difference between the temperature of the air-mixed steam and the saturation temperature of the steam at the pressure inside the pressure vessel. However, it is preferable to release air and air-mixed vapor until the temperature becomes lower than 5 ° C.

Further, according to the present invention, when air and air-mixed steam are discharged to the outside of the pressure vessel 1, a storage tank 21 is connected via a pipe to temporarily mix air and air into the storage tank. This is an aging method of storing steam.

Further, according to the present invention, a plurality of pressure vessels for aging are juxtaposed, and a plurality of pressure vessels are selectively used for aging. By supplying a part of the water vapor to the pressure vessel for aging,
This is an aging method that covers a part of the pressurized steam supplied to the pressure vessel in the next step.

Further, the present invention provides a pressure vessel having an opening / closing lid for charging and discharging a steelmaking slag, a steam generator connected to a pipe having a valve on an upper part of the pressure vessel, and a lower part of the pressure vessel. Aging apparatus for steelmaking slag having a pipeline having a steam trap connected to a hot water discharge port, and a pipeline open to the atmosphere having a valve connected to depressurize the pressure vessel at the top of the pressure vessel. In addition, the aging apparatus for steelmaking slag is provided with a pipe for discharging air-mixed steam near the bottom of the pressure vessel.

This apparatus comprises means for charging the slag into the pressure vessel and means for discharging the slag from the pressure vessel, and the means for transporting comprises a carriage. Is equipped with a non-sealed container for containing the steelmaking slag.

Further, the opening and closing angle and the position of the center of gravity are specified in order to open and close the unsealed container and to smoothly discharge the contained slag.

Further, the present invention comprises a temporary mounting table for temporarily storing the non-closed container, and a discharge section for discharging the aged slag contained in the non-closed container. Each section has a sprinkler for sprinkling water on the aged slag.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, the aging apparatus for steelmaking slag of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of the vicinity of the pressure vessel, and the pressure vessel 1 is located at the center. The pressure vessel 1 is a vessel that can be hermetically sealed in order to maintain the inside of the pressure vessel 1 at a set pressure and temperature in a saturated steam atmosphere, and has an openable / closable lid 2 for carrying in / out of steelmaking slag. A pressure sensor 16 and temperature sensors 17 and 18 for measuring the pressure and temperature inside the pressure vessel 1 are provided outside the pressure device 1.
At a position corresponding to the lid 2, an unsealed container 60 for carrying in / out the steelmaking slag is movable in a longitudinal direction of the pressure vessel and a direction perpendicular to the longitudinal direction as described later. It is arranged. Above the pressure vessel 1, a steam generator 3 is provided. In order to supply a predetermined pressurized steam to the pressure vessel 1, the steam generator 3 is provided via a pipe 5 provided with a pressure sensor 15 and a valve 4. Connected to pressure vessel 1. In addition, in the lower part of the pressure vessel 1, a pipe line 8 having a valve 6 and a steam trap 7 is provided in order to discharge the pressurized steam converted into hot water in the pressure vessel 1.
Is connected. Further, at the upper part of the pressure vessel 1,
A pipeline 10 having a valve 9 is connected to leak the pressure in the pressure vessel 1 after the slag aging is completed.

Also, the valve 6 of the pipe 8 for discharging hot water is used.
A pipe 12 having a valve 11 for discharging air accumulated in the pressure vessel 1 to the outside of the pressure vessel 1 is provided on the pressure vessel 1 side. Further, a pipe 14 having a valve 13 for supplying water to the pressure vessel 1 is connected to a lower portion of the pressure vessel 1.

Here, the pipeline of air and steam mixed with air
12 is preferably disposed near the bottom of the pressure vessel 1 as shown in FIG. 1 so that the water and the air can be separated as much as possible to take out a large amount of air. Further, it is preferable that the pipe line 12 is connected to the pipe line 8 for discharging the hot water inside the pressure vessel 1 in order to promote the separation of the hot water and the air accumulated in the lower part of the pressure vessel 1, and particularly, the connection. If the pipe 12 near the section is made thicker, the separation of hot water and air is further promoted. If the outlet of the pipe 12 is provided above the level of hot water, even if hot water accumulates in the hot water discharge pipe 8, the hot water is mixed with air and The situation that is released from the 12 outlets can be prevented.

Hereinafter, the steps of the aging method for steelmaking slag of the present invention using the above-described apparatus will be described in detail with reference to the temperature / pressure change graph shown in FIG.

(1) Charging step (time required t _i ) The valve 9 of the pressure vessel 1 is closed, the lid 2 of the pressure vessel 1 is opened, and the steelmaking slag is brought to a predetermined particle size by a crushing device (not shown). After crushing, the slag is charged into the pressure vessel 1 using the non-sealed vessel 60, and the lid 2 is closed and sealed. At this point, there is no change in the temperature and pressure inside the pressure vessel 1.

[0028] (2) in a state of elevated temperature and boost steps closed (time required t _p) valve 9, the pressure vessel 1 of saturated steam under pressure from the steam generator 3 through line 5 by opening the valve 4 Supply inside. The water vapor contacts the inner surface of the pressure vessel 1 and the slag, deprives the pressure vessel 1 and the slag of heat, condenses, and undergoes a phase transition from vapor vapor to liquid hot water.
By the amount of heat accompanying this phase transition, that is, latent heat,
Pressure vessel 1 and slag are heated, slag and pressure vessel
The average temperature Tc of FIG. As the average temperature Tc rises and the internal pressure Ps of the pressure vessel 1 also rises, the condensation temperature Ts of steam also rises. The hot water generated by the phase transition increases until the internal pressure Ps of the pressure vessel 1 and the average temperature Tc with the slag rise to some extent.

By the way, when the hot water stays in the pressure vessel 1, the slag is immersed in the hot water, and the transfer of the latent heat is hindered, and the temperature rising speed of the slag decreases. To prevent this, the hot water is steam trapped from the bottom of the pressure vessel 1.
It is discharged sequentially via a pipeline 8 with 7. Here, the discharged amount of hot water corresponds to the amount of generated hot water S.

Also, as the temperature inside the pressure vessel 1 rises and the pressure rises, air and air-mixed vapor accumulate in the lower part of the pressure vessel 1. Therefore, under the conditions described later, air and air are mixed appropriately. The steam is released from the line 12 to the outside of the pressure vessel by opening the valve 11. Thereby, the lower part of the pressure vessel 1 is filled with the pressurized steam.

(3) Heat-retaining step (required time t _s ) Since the pressure of the pressurized steam supplied from the steam generator 3 is constant, as the internal pressure Ps of the pressure vessel 1 increases,
The flow rate of steam supplied from the steam generator 3 decreases,
Therefore, the amount S of generated hot water due to the phase transition also decreases.

However, although the steam flow rate and the hot water generation amount S decrease, the supply of steam continues, so that the internal pressure Ps of the pressure vessel 1 further increases and the steam generator
A saturated steam atmosphere with a pressure almost equal to the steam supplied from 3 is created. In this state, steam supply and hot water discharge were continued for a certain period of time to keep the predetermined temperature and pressure constant, and the unhydrated lime hydration reaction (CaO + H ₂ O → Ca
(OH) ₂ ).

Even in the heat retention step, when air and air-mixed vapor accumulate in the lower part of the pressure vessel 1, the air and air-mixed vapor are released under the conditions described below under the condition of the valve 11
Is opened to discharge from the pressure line to the outside of the pressure vessel.

(4) Decompression step (time required t _d ) After the slag aging is completed, the valve 4 is closed to stop the supply of steam, the valve 9 on the upper part of the pressure vessel 1 is opened, and the pressure The water vapor in the container 1 is released into the atmosphere to reduce the container internal pressure Ps to atmospheric pressure. At this time, the average temperature Tc of the slag and the container 1 and the condensation temperature Ts of the steam decrease.

(5) Draining step (time required t _o ) Finally, the lid 2 of the pressure vessel 1 is opened, and the slag in the pressure vessel is discharged from the pressure vessel 1. As a result, the average temperature Tc of the slag and the pressure vessel 1 and the condensation temperature T
s is further reduced.

Through the above steps, aging is completed. Then, cover 2 of pressure vessel 1 and valve 9
Then, the valve 4 is opened to supply the steam from the steam supply device 3, and the above steps (1) to (5) are repeated, so that the next aging can be performed.

In the above (1) charging step, the steelmaking slag as a raw material is heated to a temperature at which the steelmaking slag can be transported in an unsealed container or the like.
That is, even if it is slightly heated for preheating, etc.
It is preferable to use one having a temperature of not more than ° C. Also,
The particle size of the slag collapses during aging, but if the particle size is too large, it takes time for the hydration reaction of quicklime inside the particles, so considering the aging time and the use for roadbed material, etc., 25 mm It is preferable to crush the powder having the following particle size so as to be 80% or more.

In the (2) heating / pressurizing step, the supplied saturated steam is subjected to a hydration reaction (CaO + H ₂ O → Ca
Taking into consideration that the chemical equilibrium of (OH) ₂ ) is reversed and the reaction of slaked lime to quick lime occurs, and the rate of hydration is taken into consideration, the temperature is in the range of 130 to 190 ° C, and The pressure is preferably in the range from ^{2 to} 10 kg / cm ² G.

Here, the pressure, temperature, etc. of the saturated steam supplied to the pressure vessel 1 are set within the above-mentioned ranges according to the slag input amount, the slag water immersion expansion ratio, and the slag free lime content. An appropriate value may be set based on the value.

Further, (2) a temperature raising / pressure raising step and (3)
The release of air and vapor mixed with air in the heat retention step may be appropriately adjusted depending on time, temperature or pressure.

First, as a control method based on time, it is preferable to discharge steam mixed with air for 5 to 60 minutes.
About 30 minutes is preferable. The time is set based on experience values.For example, 5 kg / cm ² G pressurized steam is supplied to 50 tons of slag, and when the internal pressure of the pressure vessel 1 reaches 1 kg / cm ² G, steam mixed with air is released. If released, 5-1 from start
After 0 minute, the upper temperature and the lower temperature of the pressure vessel 1 coincide with each other, so that the temperature may be set appropriately within the above-mentioned time using this as a guide.

As a control method according to the pressure condition,
It is preferable to release the air-mixed steam when the internal pressure of the pressure vessel reaches 1 kg / cm ² G. This is because if the internal pressure of the pressure vessel 1 is lower than 1 kg / cm ² G, the effect of releasing the air and air-mixed steam inside the pressure vessel 1 cannot be exerted, and the valve 11 must be opened for a long time. So
This is because even the required pressurized steam is lost. In addition, it is preferable that the pressure of the pressurized steam supplied to the pressure vessel be released until the internal pressure of the pressure vessel reaches a predetermined pressure of 50% or more and 95% or less with respect to the predetermined pressure. If the difference between the internal pressure of the pressure vessel 1 and the atmospheric pressure is too large, noise is generated at the time of release of air and vapor mixed with air, and even necessary pressurized steam is released with vigor.

Further, as a control method according to the temperature condition,
It is preferable to release when the difference between the temperature of the air-mixed steam and the saturation temperature of the steam at the internal pressure of the pressure vessel 1 is 5 ° C. or more. The temperature difference here is the difference between the temperature of the pressurized steam in the upper part of the pressure vessel and the temperature of the air and the air-mixed steam accumulated in the lower part of the pressure vessel 1, and as shown in FIG. What is necessary is just to measure from the temperature sensors 18 and 17 provided outside. Then, the air and the air are mixed until the difference between the temperature of the steam mixed with the air and the saturation temperature of the steam at the pressure inside the pressure vessel becomes less than 5 ° C. at which there is no problem in the temperature raising / pressurizing step and the heat retaining step inside the pressure vessel 1. It is preferred to release steam.

When air and steam mixed with air are discharged to the outside of the pressure vessel 1, as shown in FIG.
It is also possible to connect the storage tank 21 via the and to temporarily store air and steam mixed with air in the storage tank 21.
If this storage tank 21 is provided, since the pressure vessel 1 and the storage tank 21 communicate with each other, if the internal pressure of the pressure vessel 1 increases, the internal pressure of the storage tank 21 similarly increases, and the air and the air- Is stored and water vapor required for the pressure vessel 1 is not released to the outside, so that the aging time is not prolonged. In addition, valve of storage tank 21
Since the pipe 20 having the pipe 19 is open to the atmosphere, the air and the air-mixed steam may be discharged together after aging.

Further, (2) a temperature raising / pressure raising step and (3)
When discharging hot water discharged in the heat retention step, it is also useful to dilute the hot water from a pipe line 14 having a valve 13 as shown in FIGS. 1 and 3 and simultaneously supply cooling water for cooling at the same time. That is, since the solubility of calcium hydroxide dissolved in hot water decreases as the temperature of the hot water of the solvent becomes higher and it becomes more difficult to dissolve in hot water, cooling the hot water causes the calcium hydroxide to dissolve in hot water. The calcium hydroxide dissolved in the hot water is prevented from precipitating in a crystalline state in the vicinity of the pipe 8 by dissolving the calcium hydroxide in a large amount and diluting the hot water.

(4) In the depressurizing step, a part of the steam discharged from the pressure vessel which has been aged first is supplied to the pressure vessel which is to be aged next, so that the pressurized water to be supplied to the pressure vessel in the next step As shown in FIG. 4, a plurality of pressure vessels 1 shown in FIGS. 1 and 3 can be provided side by side to selectively cover a part of the steam, and the plurality of pressure vessels 1 can be selectively used for aging. is there.

Here, a plurality of pressure vessels 1 (1a, 1b)
Are arranged in parallel, and the same members as those in FIG. 1 are denoted by the same reference numerals. However, first, the reference numerals of the pressure vessel to be aged and its peripheral members are a, and then the aging is performed. The description will be made by adding b to the reference numbers of the pressure vessel and its peripheral members to be performed.

FIG. 4 is different from FIG.
In order to supply steam to the plurality of pressure vessels 1 from 3, the lines 5a, 5b having the valves 4a, 4b of the plurality of pressure vessels 1a, 1b.
And the steam supply pipe 25 are connected to each other. Further, in order to supply pressurized steam discharged after aging from one pressure vessel 1a to the other pressure vessel 1b, pipelines 23a and 23b having valves 22a and 22b are connected to the respective pressure vessels 1a and 1b. Each pipe 23 is connected by a common pipe 24.

A method of aging using the apparatus shown in FIG. 4 will be described below.

First, the pressure vessel 1a for aging first
Is the same as the above-mentioned steps (1) charging step to (3) heat retaining step and (5) discharging step, but in (4 ') depressurizing step, the valve 22a of the pressure vessel 1a and then aging , The valve 22b of the pressure vessel 1b is opened, and the water vapor remaining inside the first pressure vessel 1a is supplied to the next pressure vessel 1b via the common pipeline 24. It is assumed that the pressure vessel 1b at this time has already completed (1) the charging step. Then, after the internal pressures of the pressure vessels 1a and 1b become equal and the steam stops flowing, the valves 22a and 22b are closed, and the pressure vessel 1a
Open the valve 9a on the side and release the remaining water vapor from the line 10a to reduce the internal pressure of the pressure vessel 1a to atmospheric pressure. (5)
May be performed.

Next, after (1) the charging step is completed, (2 ')
As a temperature raising / pressurizing step, the pressure vessel 1b supplied with the steam from the pressure vessel 1a is thereafter opened with a valve 4b, and a predetermined saturated steam is supplied from the steam generator 3 through the steam supply pipe 25 and the pipe 5b. What is necessary is just to supply steam until it becomes an atmosphere. Further, here, the hot water is discharged from the pipe 8b and the hot water is diluted and cooled by supplying water from a pipe (not shown), and the air and the air-mixed steam are discharged from the pipe 12b as appropriate. After that, (3) heat retention step, (4 '
Aging is completed by performing the decompression step and (5) discharge step.

That is, here, (1) (2 ') (3)
The steps (4 ') and (5) may be repeated.

Next, the overall configuration of the steelmaking slag aging apparatus of the present invention will be described in detail with reference to FIGS.

FIG. 5 is a plan view schematically showing an aging apparatus for steelmaking slag of the present invention, and FIG. 6 is a view of FIG. 5 as viewed from the rear of the pressure vessel.

In the lower part of the drawing of FIG. 5, the pressure vessel 1 and the temporary stand are shown.
30 and a loading table 35 are provided side by side. On the other hand, the first rail 40 extends perpendicularly to the longitudinal direction of the pressure vessel 1 above the paper surface.
Is laid, and a traverse carriage 42 is loaded on the first rail so as to be movable along the first rail. A second rail 41 is mounted on the traversing carriage 42 in parallel with the longitudinal direction of the pressure vessel 1, and an elevating carriage 43 is provided on the second rail so as to be movable along the second rail. ing. Reference numerals 71, 72, and 73 denote deposit tables, respectively.

A sprinkler 70 is provided in the payout pit 36, which is a discharge part below the end of the first rail 40, and a frame member 75 assembled above the temporary stand 30 as shown in FIG. A sprinkling device 74 is also provided above.

FIG. 7 is a perspective view and FIG. 8 is a side view of the trolley 42 in detail.

Wheels 48 are mounted on the lower part of the traversing carriage 42, and the wheels 48 can move vertically on the first rail 40 with respect to the longitudinal direction of the pressure vessel 1 shown in FIG. ing. Wheels 49 are also mounted on the upper surface of the lift truck 43, and can move in parallel with the longitudinal direction of the pressure vessel 1 along the second rail 41. A bridge rail 47 having the same width as that of the second rail and being tiltably connected is mounted on the tip of the second rail. If the bridge rail 47 is tilted forward to the pressure vessel 1 side, it can be connected to the rail 44 inside the pressure vessel 1 shown in FIG. Therefore, the lift truck 43 is more pressure vessel than the first rail.
One side can move forward.

As shown in FIG. 8, an elevating device 53 is fixedly mounted on the upper front and back of the elevating truck 43, and a frame member 52 is detachably mounted on the elevating device 53. Therefore, the frame member 52 can be vertically moved in the vertical direction. Further, the frame member 52 can be loaded on the mounting table 51 fixedly mounted on the transverse carriage 42 when the elevating device 53 is in the non-extended state, and in the extended state, the loading table can be loaded.
It is possible to ascend to a position where it does not touch 51.

The frame member 52 has two pairs of rollers 54 (see FIG. 9) formed of a pair of rollers spaced apart in the longitudinal direction on the inside, and the unsealed container 60 is taken out so as to come into contact with the rollers 54. Mounted as possible. The unsealed container 60 is a pair of substantially cylindrical accommodating members 61 that are assembled so that their bottoms can be opened around a pivot shaft 62, the closing plates 63 at both ends of the accommodating member 61, and the upper part of the accommodating member 61. An upper plate 64 provided with an inclination is provided.

An engaging member 65 is formed on the side surface of the housing member 61 so as to be engaged when the distal end of the hydraulic cylinder 50 fixed to the transverse carriage 42 is extended upward. ing. Therefore, when the hydraulic cylinder 50 is extended, the tip of the cylinder and the engaging member 65 are engaged to push the engaging member 65 upward, so that the bottom of the housing member 61 fixed by the pivot shaft 62 is opened. The contents (here, aged slag) contained in the unsealed container 60 can be discharged downward. After discharging the steelmaking slag,
If the hydraulic cylinder 50 is shortened, the bottom of the non-sealed container 60 is rotated in the closing direction by the weight of the housing member 61 and closed.

FIG. 9 shows the unsealed container 60 cut along the line BB in FIG.

The main part of the non-hermetic container 60 is formed by left and right substantially cylindrical housing members 61. The accommodating member 61 has a symmetrical shape so that when a large load content such as steelmaking slag is accommodated in the non-closed container 60, the load is uniformly applied to the non-closed container 60. Also,
The opening and closing section 67 of the non-sealed container 50 is
When opening and closing, one portion of the bottom 68 is always
The bottom portion 68 has a cylindrical shape so as to slide while contacting the roller 54, and the left and right housing members 61 can be rotated by a pivot shaft 62 shown in FIG. 8 at a cylindrical center position with respect to the cylindrical shape of the bottom portion 68. It is built in. Thus, when opening and closing the opening / closing portion 67, the bottom portion is always centered on the pivot shaft 62.
Since the 68 slides on the roller 54, the opening / closing trajectory of the non-sealed container 60 becomes constant, and a stable opening / closing operation can be performed.

Considering the operability of opening and closing and the difficulty of processing, the shape of the bottom 68 is cylindrical at least below the contact surface with the roller 54 when the unsealed container is closed. In order to prevent the unsealed container from unnecessarily moving in the direction in which the bottom 68 closes and the housing member 61 from overlapping, a rotation stopper 69 is provided on the upper surface of the contact surface with the roller 54. It is preferable to keep.

The roller 54 takes into consideration the angle of repose of the steelmaking slag stored in the non-closed container 60 in order to reliably discharge the contents (aged slag) stored in the non-closed container 60 without leaving it. Therefore, the opening / closing angle of the housing member 61, that is, the angle formed by the pivot shaft 62 and the center of the roller 54 is determined by the pivot shaft 62.
It is preferable that the frame member 52 is disposed at an angle of at least 30 degrees with respect to the vertical plane including the.

Further, an upper plate 64 is provided on the upper part of the non-sealed container 60 to prevent slag from spilling out. Considering that steelmaking slag is charged, the angle is preferably within a range of 20 to 60 degrees with respect to a horizontal plane.

The non-hermetic container 60 is also provided with a closing plate at both ends of both containing members 61 so that the slag does not spill from its side surface.
It has 63. The closing plate 63 has such a shape that the slag does not spill from the side surface of the non-hermetic container 60 even when the opening / closing part 67 of the non-hermetic container 60 is opened at the above-mentioned angle. Also, one of the housing members is provided so as to protect the opening / closing portion 67 of the non-sealed container 60.
61 is provided with a bottom closure plate 68 '.

By the way, the above-mentioned non-sealed container 60 needs to be in a closed state regardless of whether the contents are stored or the contents are stored therein, unless the external force is restricted. is there.

Therefore, as shown in FIG. 10, the housing member 61 always has a a length from the rotation center 0 to the contact point of the roller 54, b a length from the rotation center 0 to the center of gravity, and θ a non-sealed container. 60 is the opening angle, β is the angle between 0G and the dividing line, Wb is the weight of the left unsealed container 60, N is the radial support force of the roller 54,
When μ is the friction coefficient of the roller 54 (μ = F / N = tan φ: where F is the tangential force of the roller 54), M = Wb · b ·
It suffices if the center of gravity is at a position such that the moment M acts in the direction of the closed state of sin (θ + β) -μ · N · a,
Therefore, the position of the center of gravity of each accommodation member 61 is
It is preferable to be inside (a range shown by diagonal lines in FIG. 10) of the vertical plane including the center position of.

The operation of the entire transfer apparatus will be described below in order with reference to FIGS.

(1) Operation before Loading Unsealed Container 60 into Pressure Vessel 1 Temporary table 30 has unsealed container 60 containing aged slag together with frame member 52 on depository 72. Is loaded. An unsealed container 60 is loaded in an empty state together with another frame member 52 on the depositing stand 73 of the loading stand 35. Also traverse truck 42
Is mounted on the lift truck 43 and is located opposite the loading platform 35.

First, a steelmaking slag is supplied from above the charging table 35 through a filling port 66 (see FIGS. 6 and 9) of the unsealed container 60 by a supply means (not shown). Then, the bridge rail 47 of the traversing carriage 42 is tilted and the rail 46 provided on the loading table 35 is tilted.
The lifting carriage 43 is moved along the rail 46 in the direction of the loading table 35, and the lifting device 53 is extended to lift the unsealed container 60 containing the slag together with the frame member 52 from the deposit table 73, and then ascend and descend The carriage 43 is retracted along the rail 46 and is loaded on the second rail 41 of the traversing carriage 42, and the lifting device 53 is in a non-extended state, and the mounting table 51 mounted on the traversing carriage 42 together with the frame member 52. The unsealed container 60 is loaded. Thereafter, the connection between the bridge rail 47 and the rail 46 is released, and the traversing trolley is moved along the second rail 41 to a position facing the temporary placement table 30.

The lid 2 of the pressure vessel 1 is opened, and the trolley 42 is moved to the position facing the pressure vessel 1. Then, the bridge rail 47 is tilted and connected to the rail 44, the lifting device 53 is extended, the frame member 52 and the non-sealed container 60 are lifted from the mounting table 51, and then the lifting carriage 43 is moved along the rail 44 to the pressure container.
(1) The frame member 52 and the non-sealed container 60 are loaded on the depository 71 with the lift device 53 moved in the non-extended state. Then, only the lifting / lowering device 53 is retracted along the rail 44 and loaded on the second rail 41 of the traversing carriage 42, and the bridge rail 47 and the rail 44
Is released, and the traversing carriage 42 is moved along the first rail to a position facing the temporary placement table 30, and then the lid of the pressure vessel 1 is closed.
Close 2

Thereafter, aging is performed.

(2) Unsealed Container 60 of Temporary Table 30 The non-sealed container 60 containing the aged slag loaded together with the frame member 52 on the depositing table 72 of the temporary table 30 has a temporary table. Watering is performed from the watering device provided above 30.

Thereafter, the traversing carriage 42 is moved to the position facing the temporary storage table 30, the bridge rail 47 is tilted from the traversing carriage 42 and connected to the rail 45, and the lifting carriage 43 is moved to the temporary storage table 30 along the rail 45. The lifting device 53 is extended, and the frame member 52 is extended.
And the unsealed container 60 is lifted from the depository 72. Then, the lifting device 53 is retracted along the rail 45 to move the
The frame member 52 and the non-sealed container 60 are mounted on the mounting table 51 while the lifting device 53 is in the non-extended state. Further, the connection between the bridge rail 47 and the rail 45 is released, and the traversing carriage 42 is moved to a position above the payout pit 36 along the first rail.

The bridge rail 47 is again tilted from the traversing carriage 42 to be connected to the rail 46 of the loading platform 35, and the lifting device 53 of the lifting carriage 43 is shortened, that is, the frame member 52 and the non-sealed container 60 are removed. While being placed on the mounting table 51, only the lift truck 43 is temporarily moved to the loading table 35 along the rail 46. Then, the opening / closing section 67 of the non-sealed container 60 on the mounting table 51 of the traversing carriage 42 is opened, and the slag is discharged to the discharge pit 36. Simultaneously with the dispensing, water is sprinkled from the sprinkling device 70 disposed above the dispensing pit 36 and below the first rail to the slag being dispensed. After the slag is dispensed, the lift truck 43 is retreated again along the rail 46 and loaded on the second rail 41 of the traverse truck 42.

Thereafter, the lifting device 53 is extended, the frame member 52 and the unsealed container 60 are lifted from the mounting table 51, and the lifting truck 43 is moved along the rail 46 to the loading table 30 to shorten the lifting device 53. After the frame member 52 and the unsealed container 60 are loaded on the deposit table 73 in this state, the lifting truck 43 is retreated again along the rail 46 and loaded on the second rail 41 of the traversing truck 42.

Then, the bridge rail 47 and the rail 46 are disconnected from each other, and the transverse carriage 42 is moved along the first rail 40 to a temporary stand.
Move to 30 face-to-face position.

(3) Unsealed Container After Aging is Completed Open the lid 2 of the pressure vessel 1, move the trolley 42 to the position facing the pressure vessel 1, connect the bridge rail 47 with the rail 44, Into the pressure vessel 1. Lift the non-hermetic container 60 together with the frame member 52 using the lifting device 53,
The lift truck 43 is retracted from the pressure vessel 1 and the second
It is loaded on the rail 41, the lifting device 53 is shortened, and the
The frame member 52 and the non-sealed container 60 are loaded on the
After the connection between the rail 47 and the rail 47 has been released, the trolley 42 is moved to the position facing the temporary table 30.

Then, the bridge rail 47 is connected to the rail 45, the elevating device 53 is extended, the frame member 52 and the unsealed container 60 are lifted from the mounting table 51, and the elevating vehicle 43 is moved to the temporary mounting table.
30 to move the lifting device 53 to a non-extended state
The frame member 52 and the non-sealed container 60 are loaded on the depository 71.

Thereafter, only the lift truck 43 is retracted along the rail 45, loaded on the second rail 41 of the traverse truck 42, the connection between the bridge rail 47 and the rail 45 is released, and the traverse truck 42 is moved to the first rail. It is moved along the 40 to the position facing the loading table 35.

Thereafter, the operations (1) to (3) are repeated.

Here, by appropriately spraying water using both or one of the water spray devices 74 and 70, it is possible to suppress generation of dust when the aged slag is discharged to the discharge pit.

[0085]

According to the aging method of the present invention, when the steelmaking slag is charged into the pressure vessel, air entering the pressure vessel and pressurized water supplied into the pressure vessel in the temperature raising / pressurizing step for performing aging. This prevents the steam mixed with air from which the water content changed to hot water is separated from the steam and accumulating in the lower part of the pressure vessel.

[0086] Thus, the pressurized steam supplied to the pressure vessel promotes temperature rise and pressure up to the lower part of the pressure vessel in a short time, thereby reducing loss of aging time of steelmaking slag. And, specifically, the following effects can be obtained.

That is, the above-mentioned air and the air-mixed steam are discharged out of the pressure vessel as appropriate under time, temperature conditions, pressure conditions, and the like from piping arranged near the bottom of the pressure vessel. Even the pressurized steam required inside can be prevented from being discharged to the outside of the pressure vessel, and the temperature rise / pressurization inside the pressure vessel can be performed in a short time.

Also, instead of directly discharging air-mixed steam to the outside of the pressure vessel, if a storage tank is provided and air and air-mixed steam are stored therein, the pressure vessel and the storage tank communicate with each other. As a result, when the internal pressure of the pressure vessel increases, the internal pressure of the storage tank also increases, so that air and steam mixed with air are stored, and the water vapor required for the pressure vessel does not discharge to the outside. It will not be done.

Further, the above-mentioned release of air and air-mixed steam is selectively aged using a plurality of pressure vessels, and a part of the water vapor discharged from the pressure vessel that has been aged first is then removed. If it is used in a method for supplying a part of the pressurized steam supplied to the pressure vessel for aging and supplied to the pressure vessel in the next step, the air and air-mixed steam accumulated in the plurality of pressure vessels can be appropriately removed from the pressure vessel. Since it can be discharged to the outside, it is possible to supply only the necessary pressurized steam without supplying the air and the air-mixed steam in one pressure vessel to the other pressure vessel. In addition, if the hot water is diluted and cooled by appropriately supplying cooling water from the lower pipe of the pressure vessel during the above-described temperature raising / pressurizing step and the heat retaining step, the solubility decreases as the temperature of the hot water of the solvent increases. By dissolving more calcium hydroxide in hot water by cooling hot water, and by diluting hot water,
Calcium hydroxide dissolved in hot water can be prevented from being in a crystalline state in the hot water discharge pipe and obstructing the pipe function.

Further, in the aging device of the present invention, since the watering device is provided above the temporary placing table for temporarily storing the aged slag and above the discharging pit for discharging the slag, any one of the watering devices is provided. By sprinkling water on the slag that has been aged by the water sprinkling device or both water sprinkling devices, it is possible to suppress the generation of dust caused by the fall of the discharged slag as much as possible.

[Brief description of the drawings]

FIG. 1 is a partial schematic view 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 of steelmaking slag in the present invention.

FIG. 3 is a partial schematic view including a storage tank of the aging apparatus for steelmaking slag of the present invention.

FIG. 4 is a partial schematic view of an aging device for steelmaking slag when a plurality of pressure vessels of the present invention are used.

FIG. 5 is a partial plan view of the steelmaking slag aging device of the present invention.

FIG. 6 is a sectional view of the device shown in FIG. 5 taken along line AA.

FIG. 7 is a perspective view of a transfer device of the aging device for steelmaking slag of the present invention.

FIG. 8 is a side view of the device shown in FIG.

9 is a sectional view of the frame member and the non-hermetic container of the apparatus shown in FIG. 8 taken along line BB.

10 is a schematic diagram illustrating the position of the center of gravity of the unsealed container shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pressure vessel 3 ... Steam generator 21 ... Storage tank 30 ... Temporary stand 35 ... Input stand 36 ... Discharge pit 40 ... 1st rail 41 ... 2nd rail 42 ... Traversing truck 43 ... Lifting truck 52 ... Frame member 60 ... Non- Closed containers 70, 74 ... watering device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigeru Morishita 1850 Minato Minato, Wakayama Prefecture Wakayama Steel Works, Sumitomo Metal Industries, Ltd. (72) Keiichi Komai 3-1-1 Higashikawasaki-cho, Chuo-ku, Hyogo Prefecture No. Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Kasei Terumae 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Kobe factory

Claims (24)

[Claims] (1) A normal temperature steelmaking slag crushed so that a particle having a particle size of 25 mm or less becomes 80% or more is charged into (1) a pressure vessel, (2) the pressure vessel is sealed, and pressurized water is introduced into the vessel. Supply steam,
At the same time, the hot water condensed by pressurizing the pressure vessel and the slag is discharged from the pressure vessel, and the pressure vessel is heated and pressurized by continuing this, and (3) the pressure in the vessel is 2 to 10 kg / cm ^2. G for 1 to 5 hours in a saturated steam atmosphere at a predetermined pressure. (4) After that, the steam inside the pressure vessel is discharged and the pressure inside the pressure vessel is reduced to atmospheric pressure. (5) Steelmaking slag In the aging method of discharging air from the pressure vessel, the air-mixed steam accumulated in the pressure vessel is accumulated in the pressure vessel due to the heating / pressurizing step (2) in the pressure vessel and the warming step of the saturated steam atmosphere in (3). A method for aging steelmaking slag, characterized in that it is discharged to the outside. 2. The aging method for steelmaking slag according to claim 1, wherein the air-mixed steam is discharged from near the bottom of the pressure vessel. 3. The steam mixed with air is discharged from a position above a liquid surface of hot water passing through a pipe connected to the vicinity of a bottom portion of the pressure vessel.
The aging method of steelmaking slag according to 1. 4. The release time of the air-mixed steam is 5 to 60.
The method for aging steelmaking slag according to any one of claims 1 to 3, characterized in that it is a minute. 5. The internal pressure of the pressure vessel is changed to the air mixed steam.
Aging method steel slag according to any one of claims 1 to 4, characterized in that releasing from the time it reaches the 1kg / cm ² G. 6. The air-mixed steam is continued until the internal pressure of the pressure vessel reaches a predetermined pressure of 50% or more and 95% or less with respect to a predetermined pressure of the pressurized steam supplied to the pressure vessel. The method for aging steelmaking slag according to claim 5, wherein the slag is discharged. 7. The method according to claim 1, wherein the air-mixed steam is released when a difference between the temperature of the air-mixed steam and the saturation temperature of the steam at the pressure inside the pressure vessel becomes 5 ° C. or more. The aging method of steelmaking slag according to 1. 8. The steelmaking process according to claim 7, wherein the air-mixed steam is released until the difference between the temperature of the air-mixed steam and the saturation temperature of the steam at the pressure inside the pressure vessel is less than 5 ° C. Aging method for slag. 9. A plurality of pressure vessels for aging are provided side by side, and the plurality of pressure vessels are selectively used for aging, and at the time of the depressurizing step of (5), the pressure vessel that has been aged first is discharged. 9. A part of the pressurized steam to be supplied to the pressure vessel in the next step by supplying a part of the steam to be supplied to the pressure vessel to be subjected to aging next. Aging method of steelmaking slag. 10. A normal temperature steelmaking slag crushed so that 80% or more of the particles having a particle size of 25 mm or less are charged into (1) a pressure vessel, and (2) the pressure vessel is sealed and pressurized water is introduced into the vessel. Supply steam,
At the same time, the hot water condensed by pressing the pressure vessel and slag is discharged from the inside of the pressure vessel, and by continuing this, the temperature and pressure of the pressure vessel are raised, and (3) the inside of the vessel is 2 to 10 kg / cm ² G for 1 to 5 hours in a saturated steam atmosphere at a predetermined pressure. (4) After that, the steam inside the pressure vessel is discharged and the pressure inside the pressure vessel is reduced to atmospheric pressure. (5) Steelmaking slag In the aging method of discharging air from the pressure vessel, the air-mixed steam that accumulates inside the pressure vessel due to the heating / pressurizing step (2) in the pressure vessel and the heat retaining step of the saturated steam atmosphere in (3) is A method for aging steelmaking slag, characterized by storing in an air storage means provided outside the container. 11. The temperature raising / pressure raising step of (2) and (3)
When hot water is discharged in the warm water holding process in a saturated steam atmosphere, slaked lime (Ca (O (O)) dissolved in hot water by diluting hot water by pouring a small amount of water into the bottom of the pressure vessel
H) ₂ ) concentration is reduced to prevent slaked lime (Ca (OH) ₂ ) from precipitating near the hot water outlet, and at the same time, the hot water is cooled to remove slaked lime (Ca (OH) ₂ ). 2. The composition according to claim 1, wherein dissolution in hot water is promoted.
0. The aging method of steelmaking slag according to any one of 0. 12. A pressure vessel having an opening / closing lid for charging and discharging steelmaking slag, a steam generator connected to the upper portion of the pressure vessel by a pipeline having a valve, and discharging hot water to the lower portion of the pressure vessel. An aging apparatus for steelmaking slag having a pipeline having a steam trap connected for pressure reduction, and a pipeline open to the atmosphere having a valve connected to depressurize the pressure vessel at the top of the pressure vessel. An aging device for steelmaking slag, comprising a pipe for discharging air-mixed steam near the bottom of a pressure vessel. 13. The aging of the steelmaking slag according to claim 12, wherein an outlet of the air-mixed steam of the pipe for discharging the air-mixed steam is opened above a liquid level of the hot water. apparatus. 14. The aging of steelmaking slag according to claim 12, wherein the pressure vessel is connected to a storage means of the air-mixed steam via a pipe for discharging the air-mixed steam. apparatus. 15. The steelmaking slag according to claim 12, further comprising a conveying means for charging the slag into the pressure vessel and discharging the slag from the pressure vessel. Aging device. 16. The transport means comprises a transport carriage, and the transport carriage comprises a non-sealed container constituted by a pair of substantially semi-cylindrical storage members for storing the steelmaking slag. 16. The housing member is rotatably supported at both ends in the longitudinal axis direction so that the bottom portion can be opened and closed, and at least a part of the housing member near the bottom portion is formed in a cylindrical shape. Aging device for steelmaking slag described. 17. The transport vehicle includes a frame member, the frame member including two pairs of roller members spaced apart in a longitudinal direction of the non-closed container, and a bottom portion of the non-closed container on the roller member. The aging apparatus for steelmaking slag according to claim 16, wherein a non-hermetic container is placed on the frame member so as to be movable. 18. The aging device for steelmaking slag according to claim 17, wherein an opening corresponding to a bottom opening / closing opening of the non-closed container is provided in the frame member. 19. An opening / closing angle of a housing member at the bottom of the unsealed container, that is, a plane defined by a central axis of a cylindrical portion forming the bottom and a central axis of a roller of the frame member, and a vertical plane. 19. The aging apparatus for steelmaking slag according to claim 17, wherein the angle is at least 30 degrees or more. 20. The cylindrical bottom portion of the unsealed container,
In the closed state of the unsealed container, the frame member is configured to be below the contact surface with the two pairs of rollers, and above the contact surface with the two pairs of rollers, the roller is in contact with the roller. The steel manufacturing slag aging device according to any one of claims 17 to 19, wherein a rotation stopper is provided to prevent excessive rotation of the closed container by coming into contact therewith. 21. The position of the center of gravity of both of the storage members of the non-closed container is inside a vertical plane including a contact surface between a roller corresponding to each storage member and a bottom portion of the storage member in the closed state of the non-closed container. 21. The aging device for steelmaking slag according to claim 17, wherein the aging device is formed as follows. 22. The steelmaking slag according to claim 17, wherein an upper plate having an inclination angle of not less than 20 degrees and not more than 60 degrees with respect to a horizontal plane is provided at both apex portions of the both housing members. Aging equipment. 23. A first rail laid in a direction perpendicular to a longitudinal direction of the pressure vessel facing the pressure vessel, and a traversing mechanism movably mounted along the first rail. A trolley, a second rail laid on the traverse cart in parallel with the longitudinal direction of the pressure vessel, an elevating trolley loaded so as to be movable along the second rail, 2nd at the end of 2 rails
A bridge rail that is tiltably connected with the same width as the rail, a frame member that is liftably and removably mounted by a lifting device fixedly mounted on a lifting carriage, and is taken out from the frame member. The aging apparatus for steelmaking slag according to any one of claims 16 to 22, further comprising a non-hermetic container placed so as to be capable of being placed. 24. A temporary placement table for temporarily placing an unsealed container containing aged slag near the first rail in parallel with the second rail, and a non-closed container provided below the predetermined position of the first rail. 2. A discharging unit for discharging aging slag contained in a closed container, and the temporary placing table and the discharging unit each have a watering device for watering the aging slag with water.
The aging device for steelmaking slag according to any one of 6 to 23.