JPH09299921A - Slag reforming method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the magnetized material having high contents of Pb, Cr, etc., along with iron with high efficiency regardless of the variations in the contents of the magnetized material in a raw slag, water, etc., to make the slag harmless and to stabilize quality by conducting magnetic separation with a magnetic separator provided with a function to adjust the water-to-slag weight ratio. SOLUTION: The magnetized material contained in the molten slag and consisting essentially of metallic iron is removed as follows. Namely, water is sprinkled on the slag in a slag feeder 10 so that the water-to-slag weight ratio is controlled to 0.2-2.0, then the slag is supplied to the upper end of the drum 26 of a magnetic separator 20, then water is sprinkled on both sides of the drum 26 from the upper part of the separator 20 so that the water-to-slag weight ratio is adjusted to 0.2-2.0, and the slag and magnetized material are separated by a separator 30 at the lower part of the drum 26. The slag freed from the magnetized material is submitted to a solid-liq. adjuster 38, crushed by a vibrating crusher 48, then introduced into a hot-water treating machine 52 and reformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a by-product of metal refining from molten slag by melting treatment of waste such as refuse incineration ash, coal ash, sewage sludge, and other sludge, clinker by burning coal, or ore. The present invention relates to a method and an apparatus for reforming slag and the like into slag of stable quality and high quality by performing magnetic separation treatment and optionally crushing treatment or hot water treatment. The slag modified by the present invention can be used as a civil material, a construction material, a fishery material, etc. as a substitute for natural aggregate.

[0002]

2. Description of the Related Art Slag produced by melting waste incineration ash or other waste, burning fuel, or refining raw materials contains a large amount of heavy metals such as Pb and Cr in addition to metallic iron, and The change in the content cannot be ignored. Therefore, when using these slags as a substitute resource for natural resources, it is important to remove harmful substances such as metallic iron and heavy metals such as Pb and Cr contained in the slags. For this reason, in order to remove the magnetized material mainly composed of metallic iron contained in the slag, magnetic separation treatment has been conventionally performed.

Up to now, the water / slag weight ratio has been set to a value greater than 2, slag has been supplied to the lower part of the rotary drum of the wet magnetic separator, and the wet one-stage magnetic separation treatment has been carried out at a drum rotation speed of 50 rpm or less. Is known (see, for example, "Nippon Steel Technical Report No. 345 (1992) pp. 76-78," Research on Utilization of Municipal Waste Slag for Recycling ")". Further, it is known that the moisture of the slag is set to 15% or less, the slag is supplied to the upper part of the magnetic separator drum, and the wet one-stage magnetic separation process is performed by setting the peripheral speed of the drum to 100 m / min or more (for example, “Heisei Heisei”). Fiscal Year Tokyo Metropolitan Waste Cleanup Research Institute Research Report 102-110
See "Investigation of metal removal properties in slag" on page.) Further, JP-A-5-255714 discloses that the water content in the slag is 15%.
The wet one-stage magnetic separation process of supplying slag to the upper part of the rotating drum is described below.

When the magnetically treated slag is used as a substitute for natural resources, for example, as a substitute for natural aggregate, it is natural that the slag has few fine particles and a narrow particle size width. Since the quality is inferior to the aggregate,
Although it is necessary to crush the slag, conventionally, the slag was crushed using an impact crusher such as a hammer crusher or a cone crusher. Further, in order to modify the slag suitable as a substitute for natural aggregate, surface treatment of the slag may be carried out by hot water treatment, which is conventionally disclosed in JP-A-4-326975. To
The treatment with hot water whose temperature and pH were adjusted was performed.

[0005]

However, the conventional wet type 1
In the stepwise magnetic separation treatment, in the method of setting the weight ratio of water / slag to a value larger than 2 (the amount of water in the slag increases), it is necessary to use a large amount of water, and after the magnetic separation treatment, the slag is dried. Had to do. In "Nippon Steel Technical Report No. 345 (1992) pp. 76-78" Recycling and Utilization Research of Municipal Waste Slag "", slag after magnetic separation contains about 0.25% metallic iron, Kaihei 5-2
In Japanese Patent No. 55714, 0.2% is added to the slag after the magnetic separation treatment.
The content of iron was high, and the content of metallic iron was high. In addition, in “1993 Tokyo Metropolitan Waste Cleanup Research Report, pages 102 to 110,“ Survey of metal removal in slag ”, the iron content in the treated slag was about 50% as the iron content in the raw slag varied. It fluctuated in a high value range of 0.2 to 0.5%.

Further, in the conventional method of crushing slag by using an impact type crusher such as a hammer crusher or a cone crusher, if the water content in the slag is 15% or more, stable operation of the crusher becomes difficult and It was difficult to increase the number of fine particles in the inside to secure a wide range of particle sizes. Furthermore, in the conventional hot water treatment as described in JP-A-4-326975, it is necessary to use a large amount of water for the hot water treatment because there is no stirrer for stirring the slag.
Further, uniform surface treatment cannot be performed, which causes variation in the slag modification effect.

The present invention has been made in view of the above points, and an object of the present invention is that if it is untreated, the quality will vary, and a large amount of heavy metals such as Pb and Cr will be contained together with metallic iron as an impurity. Therefore, it is an object of the present invention to provide a reforming method and apparatus for stabilizing the quality of slag, the use of which has been hindered. Further, another object of the present invention is to modify the raw material particle size, even when there are few fine particles in the slag or when the water content in the raw material varies, etc., a reforming method for obtaining slag of stable quality and To provide a device. Still another object of the present invention is to provide a reforming method and apparatus for obtaining high-quality slag excellent in quality as a construction material and the like as compared with natural aggregate.

[0008]

In order to achieve the above object, the method for modifying a slag of the present invention, in order to remove a magnetized product mainly composed of metallic iron contained in molten slag,
After sprinkling water on the slag in the slag supply device so that the weight ratio of water / slag is in the range of 0.2 to 2.0, this slag is supplied to the upper end of the magnetic separator drum, and then water / slag is supplied. Water is sprinkled from the upper part of the magnetic separator to both sides of the magnetic separator drum so that the weight ratio of the slag is in the range of 0.2 to 2.0, and the slag and the magnetized substance are separated by the separating device below the magnetic separator drum. It is characterized by that. In the method of the present invention described above, it is desirable to spray water from the upper two locations of the magnetic separator on both sides of the magnetic separator drum. In the above method of the present invention, it is desirable that the peripheral speed of the magnetic separator drum be in the range of 3 to 50 m / s.

Further, in the above-mentioned method of the present invention, a fixed separation device which is provided at the lower part of the magnetic separator drum and is composed of either a soft material plate or a brush, and either the soft material plate or the brush is attached to a rotary shaft. It is desirable to separate the slag from the magnetized material by any of the rotating separators. Further, in the above method of the present invention, it is desirable that the magnetic separator drums are provided in upper and lower two stages, and the upper drum is rotated at a peripheral speed of 1.1 to 3 times that of the lower drum. . Further, in the above-mentioned method of the present invention, in the vibrating trough having a water discharge port at one end,
The porosity of a porous partition plate having a large number of holes with a diameter of 4.0 mm is adjusted, or / and the tilt angle of the trough is adjusted in the range of 1 to 10 degrees so that the water outlet side is facing downward, It is desirable to separate the slag and the water after separating the substances so that the weight ratio of water / slag is in the range of 0.2 to 2.0.

In the above method of the present invention, after adjusting the weight ratio of water / slag in the slag to be in the range of 0.2 to 2.0, the slag is crushed using a vibration crusher. Processing is desirable. In this case, it is desirable to use a vibration type crusher using a rod. Further, in the above method of the present invention, after separating the slag and the magnetized material, lime slurry is added to the slag, the water / slag weight ratio is in the range of 0.2 to 2.0, and the pH is 9.0-1
It is adjusted so as to be in the range of 2.5, and then the slag is agitated by a hot water treatment machine while heating the slag to 60 to 100 ° C. using either steam or hot air as a heat source. It is desirable to carry out for 5 hours.

In the method of the present invention, the slag crushed by the vibration crusher may be conveyed by the slag conveyer. In the method of the present invention, the slag from which the magnetized material and water have been separated may be conveyed by a slag conveyer and introduced into the hot water treatment machine for heating / stirring treatment. Further, in the method of the present invention, the slag in which the magnetized material and the water are separated is introduced into a vibration type crusher, and the slag crushed by the vibration type crusher is conveyed by a slag conveyer to a hot water treatment machine. In some cases, it is introduced into and heated and stirred.

The slag reforming apparatus of the present invention comprises a slag feeder having a first sprinkler for spraying water on the molten slag, and metallic iron contained in the slag fed from the slag feeder. A magnetic separator drum for removing the main magnetized material, a second sprinkler for spraying water from the upper side to both sides of the magnetic separator drum, and a slug and magnetized material provided at the lower part of the magnetic separator drum. And a magnetic separator having a separating device for separating the magnetic field. In the above-mentioned device of the present invention, it is desirable that the second water sprinkling device for spraying water on both sides of the magnetic separator is provided at two upper portions of the magnetic separator.

Further, in the above-mentioned apparatus of the present invention, the separating device provided under the magnetic separator drum is a fixed separating device composed of either a soft material plate or a brush, or a soft material plate or a brush. It is desirable to have a configuration that is one of the rotary separation devices attached to the rotary shaft.
Further, in this case, it is desirable that the material of the soft material plate is either rubber or soft plastic, and the material of the brush is nylon thread. Further, in the above-mentioned apparatus of the present invention, it is desirable that the magnetic separator is composed of upper and lower two-stage magnetic separator drums, and the upper drum rotates at a peripheral speed higher than that of the lower drum. Further, in the above-mentioned device of the present invention, a third water sprinkler device provided on the upper part of the trough, a water discharge port provided on one end of the trough,
It has a porous partition plate having a large number of holes with a diameter of 4.0 mm, and the inclination angle of the trough is from 1 to 10 so that the water outlet side is facing down.
It is desirable to have a configuration in which a solid-liquid adjusting device composed of a vibrating trough inclined in the range of degrees is provided below the magnetic separator.

Further, in the above-mentioned device of the present invention, it is desirable that a vibrating crusher is provided after the magnetic separator via a solid-liquid adjusting device. Further, in this case, it is desirable to use a vibration type crusher using a rod as the vibration type crusher. Further, in the above-mentioned device of the present invention,
Having a slurry supply means for adding lime slurry to the slag, a hot water treatment machine for stirring the slag while heating the slag using either steam or hot air as a heat source, the latter stage of the solid-liquid adjusting device. In some cases, the configuration may be prepared for. Further, in the above apparatus of the present invention, having a slurry supply means for adding lime slurry to the slag, hot water for stirring the slag while heating the slag with either steam or hot air as a heat source. It is desirable that the processing machine be provided at a stage subsequent to the vibration type crusher.

In the apparatus of the present invention, the slag carrier may be connected to the latter stage of the vibration type crusher. In addition, the apparatus of the present invention may have a configuration in which a hot water treatment machine is connected to the solid-liquid adjusting apparatus via a slag carrier. Further, the apparatus of the present invention may have a configuration in which a hot water treatment machine is connected to a vibration type crusher via a slag carrier.

As described above, in order to exert a stable treatment effect regardless of the iron content in the slag, the weight ratio of water / slag is in the range of 0.2 to 2.0, preferably 0.4. ~
Water is sprayed (sprinkled) on the slag in the slag supply device so that the range becomes 1.5. When the weight ratio of water / slag is less than 0.2, the dispersion of slag is poor and the treatment effect is poor. On the other hand, when it exceeds 2.0, the amount of slag treated is low and the amount of water is large. It becomes necessary and wastewater treatment cost becomes high. In addition, in order to achieve stable discharge of slag and iron,
Water is sprayed from the upper part of the magnetic separator to both sides of the magnetic separator drum so that the weight ratio of water / slag is in the range of 0.2 to 2.0, preferably 0.4 to 1.5. To do. When the weight ratio of water / slag is less than 0.2, the discharge of slag and iron becomes unstable. On the other hand, when it exceeds 2.0, a large amount of water is required and the wastewater treatment cost becomes high. If water cannot be sprayed (sprinkled) on both sides of the magnetic separator drum, iron cannot be discharged even if slag can be discharged. Therefore, for example, it is preferable to sprinkle (sprinkle) water on the magnetic separator drum from two upper portions of the magnetic separator. In order to secure a high recovery rate of slag and reduce the content of magnetized substances in the slag, the peripheral speed of the magnetic separator drum is set in the range of 3 to 50 m / s, preferably 5 to 20 m / s. It is preferably within the range. When the peripheral speed of the magnetic separator drum is less than 3 m / s, the magnetic separation treatment capacity is low, while when it exceeds 50 m / s, the slag recovery rate is low and the amount of magnetized material in the recovered slag is large. . Further, in order to secure a high slag recovery rate and reduce the magnetized substance content rate in the slag, the magnetic separator drums are provided in two upper and lower stages, and the upper drum is 1.1 to 1.1 times the lower drum. It is preferable to be configured to rotate at a peripheral speed of 3 times, preferably 1.5 to 2.5 times. When the peripheral speed of the upper drum is less than 1.1 times the peripheral speed of the lower drum, the magnetic separation processing capability becomes low. On the other hand, when it exceeds 3 times, the slag recovery rate becomes low and the amount of magnetized substances in the recovered slag increases.

Further, in order to stably transport the slag, and to increase the number of fine particles in the slag to broaden the particle size distribution and secure a predetermined particle size, the weight ratio of water / slag is 0.
After adjusting to a range of 2 to 2.0, preferably 0.4 to 1.5, it is preferable to crush the slag using a vibrating crusher using a rod. water/
If the weight ratio of slag is less than 0.2, the transportation of slag may be unstable, the supply part and the discharge part of slag may be blocked, and the dispersion of raw materials may be unstable, and the crushing effect may not be stable. . On the other hand, when it exceeds 2.0, the crushing effect becomes insufficient, and it is not possible to secure fine particles and it is not possible to achieve a wide range of particle sizes. In the solid-liquid adjusting device, the weight ratio of water / slag is in the range of 0.2 to 2.0, preferably 0.4 to
The tilt angle of the trough should be 1-10 so that the range is 1.5.
When adjusting in the range of degrees, the water / slag weight ratio is 0.2
If less than, sprinkle water (sprinkle) in the vibration trough,
At the same time, the inclination angle of the trough is made gentle or the aperture ratio of the porous partition plate is made small. On the other hand, when it exceeds 2.0, the inclination angle of the trough is made steep or the aperture ratio of the porous partition plate is increased. That is, if the inclination angle of the trough is less than 1 degree, the weight ratio of water / slag tends to be too large, while if it exceeds 10 degrees, the weight ratio of water / slag tends to be too small. . When adjusting the aperture ratio of the porous partition plate, the pore size of the porous partition plate is 0.2 to
The diameter is preferably in the range of 4.0 mm, and more preferably in the range of 1.0 to 3.0 mm. If the pore size is less than 0.2 mm, clogging of the porous partition plate progresses and solid-liquid separation becomes poor. On the other hand, when the pore diameter exceeds 4.0 mm, the amount of slag transferred to water through the pores increases and the slag recovery rate decreases. Also, if the particle size of the raw material changes significantly, the vibration width of the vibration type crusher is adjusted by the motor frequency etc. to perform the crushing process.If the raw material particle size is small, reduce the vibration width of the crusher. If the raw material particle size is large, increase the vibration width of the crusher.

Further, in order to stably transport the slag and to achieve a sufficient surface treatment effect by the hot water treatment, the weight ratio of water / slag is 0.2.
It is preferable that the slag is subjected to hot water treatment using a hot water treatment machine after adjusting to a range of to 2.0, preferably 0.4 to 1.5. When the weight ratio of water / slag is less than 0.2, stable transportation of slag is difficult, and the surface treatment effect by hot water treatment is insufficient, while when it exceeds 2.0, the amount of water is large. It becomes necessary and wastewater treatment cost becomes high. Further, in order to obtain a slag with good hydrophilicity, and easy to construct as a civil engineering material, etc., in order to obtain a slag having a strength higher than natural aggregate as concrete aggregate, add lime slurry to the slag, pH
Is in the range of 9.0 to 12.5, preferably 10.0 to 1
It is preferable that the slag is adjusted to a range of 2.0 and then the slag is subjected to hot water treatment using a hot water treatment machine. When the pH is less than 9.0, the surface treatment effect (improvement of hydrophilicity) is insufficient, while when it exceeds 12.5, the surface of the slag becomes brittle and the weight loss due to the abrasion becomes large, When used as concrete aggregate, etc., the adhesive strength with cement decreases. Further, in order to economically achieve a sufficient surface treatment effect by the hot water treatment, a slag of 60 to 100 ° C., preferably, using a hot water treatment machine,
Agitate the slag by 0.5 while heating it to 80-98 ° C.
~ 5 hours, preferably 1-3 hours. If the heating temperature is lower than 60 ° C., the surface treatment effect is insufficient, while if it exceeds 100 ° C., the processing equipment becomes expensive. If the treatment time is less than 0.5 hr, the surface treatment effect is insufficient, while if it exceeds 5 hr, the treatment equipment becomes expensive. In order to ensure stable transportation of the slag and to achieve a uniform surface treatment, it is preferable to perform the slag stirring treatment. If the stirring treatment is not performed, the surface treatment effect is insufficient and stable transportation of slag becomes difficult.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5, but the present invention is not limited to the embodiments described here. FIG. 1 schematically shows a slag reforming apparatus according to a first embodiment of the present invention. In FIG. 1, 10 is a slag supply device, which has a raw material slag hopper 12, a first sprinkler device 14, a vibrating feeder 16, and a vibrating device 18. Reference numeral 20 denotes a magnetic separator, which includes magnetic separator drums 26 and 28, which are rotating drums provided with fixed magnets 22 and 24, and slag-iron separators 30 and 32, which are provided in the lower center of the magnetic separator drum. Have Raw material slag hopper 12
The molten slag injected into the container is sprayed (sprayed) by the first sprinkler 14 while moving in the vibrating feeder 16 provided substantially horizontally, and the weight ratio of water / slag is 0.2 to.
It is adjusted to be in the range of 2.0, preferably 0.4 to 1.5. This slag is vibrating feeder 16
After being supplied to the upper end of the upper magnetic separator drum 26 from the outlet of, the water is sprinkled (sprayed) from the second sprinklers 34 provided at the upper two places of the magnetic separator 20, and the weight ratio of water / slag is increased. Range of 0.2 to 2.0, preferably 0.4 to 1.5
It is adjusted to be within the range. In the present embodiment, two second water sprinklers 34 are provided, but one or three or more second water sprinklers 34 are provided as long as water can be sprinkled on both sides of the magnetic separator drum. It doesn't matter.
For example, when the second sprinkler 34 is provided at one location on the magnetic separator 20, the configuration is as shown in FIG. The slag supplied onto the upper magnetic separator drum 26 is supplied onto the lower magnetic separator drum 28 after the magnetized material such as iron is separated from the slag by the slag-iron separation device 30, and further slag-iron. The separating device 32 separates the slag and the magnetized material such as iron. 33 and 35 are guide plates. The slag from which the magnetized substance such as iron is separated is sent to the solid-liquid adjusting device 38, and the magnetized substance such as iron is discharged from the iron discharge port 36. The upper and lower magnetic separator drums 26 and 28 provided in the upper and lower two stages have a peripheral speed of 50 m / s or less, preferably 5 to 20 m / s.
It rotates at 1. The peripheral speed of the lower magnetic separator drum 28 is 1.
It is adjusted to 1 to 3 times, preferably 1.5 to 2.5 times. By adjusting in this way, a slag recovery rate of 96% or more can be ensured, and the magnetized substance content rate in the slag can be suppressed to 0.04% or less regardless of the raw material characteristics. In this embodiment, the magnetic separator drums are provided in upper and lower two stages, but it is of course possible to provide the magnetic separator drums in one stage or three or more stages. Further, as the slag-iron separation devices 30 and 32, as an example, a fixed separation device composed of a soft material plate or a brush,
Alternatively, a rotary separation device in which a soft material plate or a brush is attached to a rotary shaft is used. Then, examples of the material of the soft material plate include rubber and soft plastic, and examples of the material of the brush include nylon thread and the like.

The slag supplied to the solid-liquid adjusting device 38 is
In a vibrating trough 42 having a water outlet 40 at one end, the slag and water are separated and the water / slag weight ratio is in the range of 0.2 to 2.0, preferably 0.4 to 1.5. It is adjusted to be in the range of. In this case, the inclination angle of the trough 42 is 1 to 10 so that the water discharge port 40 side is downward.
The porous partition plate 4 having a large number of holes having a diameter of 0.2 to 4.0 mm, preferably 1.0 to 3.0 mm, which is adjusted in the range of degrees.
The porosity of 4 is also adjusted. That is, when the water / slag weight ratio is less than 0.2, water is sprinkled (sprayed) in the vibrating trough 42 by the third sprinkler 37 provided on the upper portion of the trough 42, and Or the opening rate of the porous partition plate 44 is reduced. On the other hand, when it exceeds 2.0, the inclination angle of the trough 42 is made steep, or the aperture ratio of the porous partition plate 44 is increased. Four
Reference numeral 6 is a vibration device. In addition, as the porous partition plate 44,
As an example, a porous plate made of plastic, metal, ceramics, or the like, a net body made of plastic, metal, or the like is used. The slag whose water content has been adjusted by the solid-liquid adjusting device 38 is supplied to a vibration type crusher 48 using a rod, and the slag is crushed. In this case, if the particle size of the raw material changes significantly, the vibration width of the vibration crusher 48 is adjusted by the motor frequency or the like to perform the crushing process. However, if the raw material particle size is small, the vibration width of the crusher 48 is reduced. On the other hand, when the raw material particle size is large, the vibration width of the crusher 48 is increased. By carrying out the crushing treatment in this way, it is possible to increase the fine particles in the slag and to broaden the particle size distribution. In addition, as the vibrating crusher 48, it is preferable to use a rod, but it is also possible to use another vibrating crusher.

The slag crushed by the vibrating crusher 48 is carried by a slag carrier 50 such as a bucket conveyor and supplied to a hot water processor 52 using steam as a heat source. At the slag supply port 56 of the hot water treatment machine 52, lime slurry is added to the slag from the slurry supply means 58, and the weight ratio of water / slag is in the range of 0.2 to 2.0, preferably 0.4 to 1. Adjusted to be in the range of .5,
And the pH is in the range of 9.0 to 12.5, preferably 1
It is adjusted to be in the range of 0.0 to 12.0. Thereafter, the slag is heated to 60 to 100 ° C., preferably 80 to 98 ° C. by the heat of steam while being stirred by a stirrer (for example, a screw) 60, and 0.5 to 5 hours, preferably 1 Hot water treatment is performed for 3 hours. The slag that has been subjected to hot water treatment has undergone sufficient surface treatment,
After passing through the screw type discharger 62, the reformed slag is discharged from the reformed slag discharge port 64. Reference numeral 66 is a jacket, and 68 is a drain discharge port. Instead of adding lime slurry, cement slurry, dolomite slurry, blast furnace slag slurry or the like can be added to adjust the pH.

FIG. 2 schematically shows a slag reforming apparatus according to the second embodiment of the present invention. The second embodiment of the present invention is a case where a hot water treatment machine 54 having hot air as a heat source is used instead of the hot water treatment machine 52 having steam as a heat source. 70 is a hot air outlet. Other configurations and operations are the same as those in the first embodiment of the present invention. It is of course possible to use a heat source other than steam and hot air in the hot water treatment machine. FIG. 3 schematically shows a slag reforming apparatus according to a third embodiment of the present invention. The third embodiment of the present invention is the same as the first embodiment of the present invention, wherein the slag crushed by the vibration crusher 48 without using the slag carrier 50 is a hot water treatment using steam as a heat source. This is the case when it is directly supplied to the machine 52. Other configurations and operations are the same as those in the first embodiment of the present invention. FIG. 4 schematically shows a slag reforming apparatus according to the fourth embodiment of the present invention. The fourth embodiment of the present invention is the same as the second embodiment of the present invention, in which the slag crushed by the vibration crusher 48 without using the slag carrier 50 is a hot water treatment using hot air as a heat source. Machine 54
When directly supplied to. Other configurations and operations are similar to those of the first and second embodiments of the present invention.

[0023]

EXAMPLES Preferred examples of the present invention and comparative examples thereof will be described below. A modification test was performed using a slag having the properties (properties) shown in Table 1.

[0024]

[Table 1]

Example 1 Water was sprinkled on slag A having a Pb content of 150 mg / kg, the water / slag weight ratio was set to 1.5, and the upper end of a single-stage magnetic separator rotating at a peripheral speed of 15 m / s. 200 kg / hr of slag is supplied to the drum, and 1.0 times the total amount of slag supplied is sprinkled on the drum from two locations on the drum to perform magnetic separation treatment, and the solid / liquid adjusting device is used to pass water / slag weight. A slag having a ratio of 0.25, a magnetized substance content of 0.037%, and a Pb content of 60 mg / kg was obtained. The recovery rate of slag was 96.8%.

Example 2 Water was sprinkled on slag B having a Pb content of 250 mg / kg, the water / slag weight ratio was set to 1.0, and the peripheral speed of the upper drum was set to 17
200 kg / hr of slag is supplied to the upper end of the upper drum of the two-stage magnetic separator where the lower drum rotates at a peripheral speed of 8 m / s.
Further, 0.8 times the total amount of slag supplied was sprinkled on the drum from two locations on the upper stage drum to perform magnetic separation treatment, and after passing through a solid-liquid adjusting device, a water / slag weight ratio of 0.30, containing a magnetized substance. A slag having a rate of 0.018% and a Pb content of 70 mg / kg was obtained. The recovery rate of slag was 96.4%.

Example 3 Water was sprinkled on the slag C, the water / slag weight ratio was set to 0.5, and 200 kg / hr of slag was supplied to the upper end of the one-stage magnetic separator rotating at a peripheral speed of 20 m / s. And then the upper part of the drum 2
A total of 0.5 times the amount of slag supplied from the location was sprinkled on the drum to perform magnetic separation treatment, and after passing through a solid-liquid adjusting device, a slag with a water / slag weight ratio of 0.24 and an iron content of 0.020%. Got The recovery rate of slag was 97.8%.

Example 4 The slag obtained in Example 1 was crushed using a vibrating crusher using a rod to obtain slag A1. The characteristics of the slag A1 are as shown in Table 2, the particle size range was widened, and it was possible to secure the modified CBR of natural river sand or more.

Example 5 The slag obtained in Example 2 was crushed using a vibrating crusher using a rod to obtain slag B1. The characteristics of the slag B1 are as shown in Table 2, and the particle size range was widened, and it was possible to secure the modified CBR of natural river sand or more.

Example 6 To the slag obtained in Example 3, 2% lime slurry was added in an amount corresponding to 5% of the slag supply amount (dry base), and steam at 110 ° C. was stirred ( It is supplied to a horizontal hot water treatment machine having a screw) and treated for 1.2 hours at a temperature of 95 ° C. and pH 12.1 while stirring,
Slag C1 was obtained. The block using the slag C1 as the surface layer aggregate of the interlocking block has the same strength as the block using natural coarse sand.

Example 7 200 kg / hr of the slag obtained in Example 5 was conveyed to a hot water treatment machine by a bucket conveyor, and 2% lime slurry was added in an amount corresponding to 10% of the slag supply amount (dry base). At the same time, steam with 110 ° C is supplied to a horizontal hot water treatment machine having a stirrer (screw) and treated for 1.0 hour under conditions of temperature 95 ° C and pH 11.6 while stirring,
Slag B2 was obtained. The characteristics of the slag B2 are as shown in Table 2, and it was possible to secure the modified CBR and mortar strength that are higher than those of natural river sand.

COMPARATIVE EXAMPLE 1 Without sprinkling water on the slag A, 200 kg / hr was supplied to the upper end of the one-stage magnetic separator rotating at a peripheral speed of 15 m / s, and the slag was supplied from the two upper parts of the drum in total. Amount of 1.0
Double the amount of water was sprinkled on the drum to perform magnetic separation treatment, and a slag having a water / slag weight ratio of 0.29 and a magnetized substance content rate of 2.6% was obtained through a solid-liquid adjusting device. The recovery rate of slag is 7
2.2%.

Comparative Example 2 Slag (water / slag weight ratio: 2.2) that did not pass through the solid-liquid adjusting device according to Example 1 was crushed at 200 kg / hr using a vibration crusher using a rod, Slag A2 was obtained through the solid-liquid adjusting device. The characteristics of slag A2 are as shown in Table 2, and the crushing effect was insufficient, and the quality of slag was not good.

[0034]

[Table 2]

As described above, the slag subjected to the magnetic separation treatment can be applied to a surface layer aggregate such as a decorative block and an interlocking block. Further, the slag subjected to the magnetic separation treatment and the crushing treatment has a wide particle size distribution,
Since a high modified CBR can be secured, it can be applied to civil engineering materials such as backfill materials and backfill materials, concrete products with a low water / cement ratio such as interlocking blocks, in addition to the above-mentioned applications. Furthermore, the slag that has been subjected to magnetic separation treatment, crushing treatment and hot water treatment has good surface hydrophilicity and has a wide particle size distribution, so in addition to the above applications, concrete fine aggregate, civil engineering materials, etc. It can be applied to a wide range of uses.

[0036]

As described above, the present invention has the following effects. (1) By performing a magnetic separation process with a magnetic separator having functions such as adjusting the water / slag weight ratio, it is possible to achieve high efficiency with iron P regardless of fluctuations in the amount of magnetized material and water in the raw slag.
It is possible to remove magnetized substances containing a large amount of heavy metals such as b and Cr, so that the slag is rendered harmless and the quality is stabilized. (2) When the crushing process is performed by a vibration type crusher equipped with functions such as adjusting the water / slag weight ratio, the particle size of the raw slag,
Slags having a wide range of particle sizes can be obtained regardless of fluctuations in water content, and the quality of slag can be stabilized and the quality of slag can be improved. (3) When the hot water treatment is performed while stirring the slag surface under hot water of high pH, the hydrophilicity of the slag surface is improved, and a construction material having a quality equivalent to or higher than natural sand can be obtained. (4) By appropriately combining magnetic separation treatment, crushing treatment, and hot water treatment depending on the aggregate situation in the region or the quality of slag, it is possible to stably supply slag of a predetermined quality. (5) By improving the quality of slag and making it harmless, the applications in which slag can be used are expanded,
Expected to expand usage. (6) The modified slag can be used as a substitute for natural aggregate.
It can be widely used as civil engineering materials, construction materials, marine products, etc.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a slag reforming apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a slag reforming apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a slag reforming apparatus according to a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a slag reforming apparatus according to a fourth embodiment of the present invention.

FIG. 5 is an enlarged configuration diagram showing a case in which a second sprinkler is provided at one location on the top of the magnetic separator.

[Explanation of symbols]

 10 slag supply device 12 raw material slag hopper 14 first sprinkler device 16 vibration feeder 18, 46 vibration device 20 magnetic separator 22, 24 fixed magnet 26, 28 magnetic separator drum 30, 32 slag-iron separation device 33, 35 guide plate 34 second Water sprinkler 36 Iron outlet 37 Third water sprinkler 38 Solid-liquid adjusting device 40 Water outlet 42 Vibratory trough 44 Perforated partition plate 48 Vibratory crusher 50 Slag conveyor 52, 54 Hot water processor 56 Slag supply 58 Slurry Supplying means 60 Stirrer 62 Screw type discharger 64 Reforming slag discharge port 66 Jacket 68 Drain discharge port 70 Hot air discharge port

Front page continued (72) Inventor Katsuji Nagahara 1-3-3 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe headquarters (72) Inventor Akira Kaga 1-3-1 Higashikawasaki-cho, Chuo-ku, Kobe No. Kawasaki Heavy Industries, Ltd.Kobe Head Office

Claims (24)

[Claims] 1. A slag supply device in which a weight ratio of water / slag is in a range of 0.2 to 2.0 in order to remove magnetized material mainly composed of metallic iron contained in molten slag. After sprinkling the slag with water, this slag is fed to the upper end of the magnetic separator drum, and then the water / slag weight ratio is 0.2.
To 2.0, water is sprinkled from the upper part of the magnetic separator to both sides of the magnetic separator drum, and the slag and the magnetized material are separated by a separator at the lower part of the magnetic separator drum. Quality method. 2. The method for reforming slag according to claim 1, wherein water is sprayed from two upper portions of the magnetic separator to both sides of the magnetic separator drum. 3. A method for reforming slag according to claim 1, wherein the peripheral speed of the magnetic separator drum is in the range of 3 to 50 m / s. 4. A fixed separating device comprising a soft material plate and a brush, which is provided at a lower portion of the magnetic separator drum, and a rotary separating device in which either the soft material plate or the brush is attached to a rotary shaft. The method for modifying slag according to claim 1, wherein the slag and the magnetized substance are separated. 5. The slag according to claim 1, wherein the magnetic separator drums are provided in upper and lower two stages, and the upper drum rotates at a peripheral speed 1.1 to 3 times that of the lower drum. Reforming method. 6. A vibrating trough having a water outlet at one end thereof, the porosity of a perforated partition plate having a large number of holes having a diameter of 0.2 to 4.0 mm is adjusted, and / or the inclination angle of the trough is adjusted. It is adjusted in the range of 1 to 10 degrees so that the outlet side of the water is downward, and the slag and the water after separating the magnetized substance are separated from each other.
The method for modifying slag according to claim 1, wherein the weight ratio of the slag is in the range of 0.2 to 2.0. 7. The slag is crushed by using a vibration type crusher after adjusting the weight ratio of water / slag in the slag to be in the range of 0.2 to 2.0. The method for modifying slag according to any one of claims. 8. After separating the slag and the magnetized material, a lime slurry is added to the slag so that the weight ratio of water / slag is 0.
The pH is adjusted to be in the range of 2 to 2.0 and the pH is in the range of 9.0 to 12.5, and then the slag is set to 60 to 60 by using either steam or hot air as a heat source using a hot water treatment machine. 10
The method for modifying slag according to claim 1, wherein the slag is stirred for 0.5 to 5 hours while being heated to 0 ° C. 9. The slag reforming method according to claim 7, wherein the slag crushed by the vibration crusher is conveyed by a slag conveyer. 10. A slag from which magnetized material and water are separated,
It is conveyed by a slag conveyor and introduced into a hot water treatment machine to heat it.
The method for modifying slag according to claim 8, wherein a stirring process is performed. 11. A slag from which magnetized substances and water have been separated is introduced into a vibration crusher, and the slag crushed by this vibration crusher is conveyed by a slag conveyor and introduced into a hot water treatment machine. The method for modifying slag according to claim 8, wherein heating and stirring are performed. 12. A first for sprinkling water on molten slag.
A slag feeder having a sprinkler, a magnetic separator drum for removing magnetized material mainly composed of metallic iron contained in the slag supplied from the slag feeder, and water from both sides of the magnetic separator drum from above. A second sprinkler for spraying the magnetic field and a lower part of the magnetic separator drum,
A magnetic separator having a separation device for separating slag and magnetized matter, and a slag reforming device. 13. The slag reforming apparatus according to claim 12, wherein second sprinklers for spraying water on both sides of the magnetic separator are provided at two upper portions of the magnetic separator. 14. A separation device provided at the bottom of a magnetic separator drum is a fixed separation device composed of either a soft material plate or a brush, and a rotary separation device in which either a soft material plate or a brush is attached to a rotary shaft. The slag reforming apparatus according to claim 12 or 13, which is any one of the above. 15. The slag reforming apparatus according to claim 14, wherein the material of the soft material plate is either rubber or soft plastic, and the material of the brush is nylon thread. 16. The slag according to claim 12, wherein the magnetic separator comprises upper and lower two-stage magnetic separator drums, and the upper drum is rotated at a peripheral speed higher than that of the lower drum. Reformer. 17. A third sprinkler provided at the top of the trough, a water outlet provided at one end of the trough,
A porous partition plate having a large number of holes each having a diameter of 4.0 mm.
The tilt angle of the trough is 1 to 1 so that the outlet side of the water is facing down.
The slag reforming apparatus according to any one of claims 12 to 16, further comprising a solid-liquid adjusting device, which is composed of a vibrating trough inclined in a range of 0 degree, provided below the magnetic separator. 18. The slag reforming apparatus according to claim 17, further comprising a vibrating crusher provided in the latter stage of the magnetic separator through a solid-liquid adjusting device. 19. The slag reforming apparatus according to claim 18, wherein the vibration crusher is a vibration crusher using a rod. 20. A hot water treatment machine having slurry supply means for adding lime slurry to slag, for performing stirring treatment of slag while heating the slag using either steam or hot air as a heat source, The slag reforming apparatus according to claim 17, which is provided at a stage subsequent to the liquid adjusting apparatus. 21. A hot water treatment machine having a slurry supply means for adding lime slurry to the slag, for stirring the slag while heating the slag using either steam or hot air as a heat source is vibrated. 20. The slag reforming apparatus according to claim 18 or 19, which is provided in a subsequent stage of the crusher. 22. The slag reforming apparatus according to claim 18 or 19, wherein a slag carrier is connected to the latter stage of the vibration crusher. 23. The slag reforming apparatus according to claim 20, wherein a hot water treatment machine is connected to the solid-liquid adjusting apparatus via a slag carrier. 24. The slag reforming apparatus according to claim 21, wherein a hot water treatment machine is connected to the vibration crusher via a slag carrier.