JP2846623B2 - Slag reforming method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to molten slag obtained by melting waste such as refuse incineration ash, coal ash, sewage sludge, and other sludge, clinker generated by burning coal and the like, and by-products produced by metal purification from ore. The present invention relates to a method and an apparatus for reforming slag or the like into slag of stable quality and high quality by subjecting slag or the like to magnetic separation treatment and, in some cases, further performing crushing treatment or hot water treatment. The slag modified according to the present invention can be used as a civil engineering material, a construction material, a fishery material, or the like as a substitute for natural aggregate.

[0002]

2. Description of the Related Art Slag produced by melting treatment of waste such as incineration ash, burning of fuel, or refining of raw materials contains a lot of heavy metals such as Pb and Cr together with metallic iron, and The fluctuation of the content is not negligible. Therefore, when these slags are to be used as alternative resources to 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 a magnetized substance mainly composed of metallic iron contained in the slag, a magnetic separation process has been conventionally performed.

[0003] Until now, the weight ratio of water / slag has been set to a value greater than 2, and slag has been supplied to the lower part of the rotating drum of the wet magnetic separator, and the number of rotations of the drum has been reduced to 50 rpm or less to perform wet single-stage magnetic separation processing. (See, for example, “Research on Utilization of Urban Waste Slag as Resources” on pages 76 to 78 of Nippon Steel Technical Report No. 345 (1992)). Further, it is known that a slag is supplied to the upper portion of a magnetic separator drum with the moisture content of the slag being 15% or less, and a wet single-stage magnetic separation process is performed with the peripheral speed of the drum being 100 m / min or more (for example, "Heisei Heisei"). FY5 Tokyo Metropolitan Institute of Waste Management Research Report 102-110
See "Research on metal removal in slag" on page. Japanese Patent Application Laid-Open No. 5-255714 discloses that slag has a water content of 15%.
The following describes a wet single-stage magnetic separation process for supplying slag to the upper part of a rotating drum.

[0004] When the slag subjected to the magnetic separation treatment is used as a substitute for natural resources, for example, as a substitute for natural aggregate, if the slag contains few fine grains and has a narrow grain size width, natural Since the quality is inferior to the aggregate,
Although it is necessary to perform slag crushing processing, conventionally, slag was crushed using an impact-type crusher such as a hammer crusher or a cone crusher. Further, in order to modify slag suitable as a substitute for natural aggregate, surface treatment of slag by hot water treatment may be performed, but conventionally, as described in JP-A-4-326975. To
The treatment was performed with hot water whose temperature and pH were adjusted.

[0005]

However, the conventional wet type 1
In the step magnetic separation treatment, in the method of setting the weight ratio of water / slag to a value larger than 2 (moisture in the slag is increased), it is necessary to use a large amount of water. Had to do. According to the “Nippon Steel Technical Report No. 345 (1992),“ Utilization research of municipal solid waste slag ”on pages 76-78, the slag after magnetic separation contains about 0.25% metallic iron. Kaihei 5-2
Also in Japanese Patent No. 55714, the slag after the magnetic separation treatment is 0.2%.
Of iron, and all of them had a high content of metallic iron. In addition, in the “Research Report on Metal Removal in Slag” on pp. 102-110 of the 1993 Tokyo Metropolitan Institute of Waste Management Research Report, the iron content in the treated slag was reduced due to the change in the iron content in the raw slag. It fluctuated in the high value range of 0.2-0.5%.

Further, in the conventional method of crushing slag using an impact-type crusher such as a hammer crusher or a cone crusher, when the water content in the slag becomes 15% or more, stable operation of the crusher becomes difficult. It was difficult to secure a wide range of particle sizes by increasing the number of fine particles inside. Further, in the conventional hot water treatment as described in JP-A-4-326975, there is no stirrer for stirring the slag, so it is necessary to use a large amount of water for the hot water treatment,
In addition, uniform surface treatment and the like cannot be performed, and the slag reforming effect has been fluctuated.

[0007] The present invention has been made in view of the above-mentioned points, and an object of the present invention is that there is a fluctuation in quality if untreated, and that a large amount of heavy metals such as Pb and Cr are contained together with metallic iron as an impurity. Therefore, an object of the present invention is to provide a reforming method and apparatus for stabilizing the quality of slag whose utilization has been hindered. Another object of the present invention is to provide a reforming method for obtaining slag of stable quality, even when the raw material particle size changes, the amount of fine particles in the slag is small, or the amount of water in the raw material fluctuates. It is to provide a device. Still another object of the present invention is to provide a reforming method and apparatus for obtaining a high-quality slag which is excellent in quality as a construction material or the like as compared with natural aggregate.

[0008]

Means for Solving the Problems In order to achieve the above object, the slag reforming method of the present invention is intended to remove a magnetized material mainly composed of metallic iron contained in molten slag.
After water is sprayed 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, the slag is supplied to the upper end of the magnetic separator drum. 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 the slag is in the range of 0.2 to 2.0, and the slag and the magnetized material are separated by the separator at the lower part of the magnetic separator drum. It is characterized by: In the above method of the present invention, it is desirable to spray water from both upper portions of the magnetic separator to 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 is in the range of 3 to 50 m / s.

Further, in the above method of the present invention, a fixed separating device comprising any one of a soft material plate and a brush provided at a lower portion of the magnetic separator drum, and any one of the soft material plate and the brush is attached to a rotating shaft. It is desirable to separate the slag and the magnetized material by any of the rotation separation devices. In the above-mentioned method of the present invention, it is desirable that the magnetic separator drums are provided in two upper and lower stages, and the upper drum rotates at a peripheral speed of 1.1 to 3 times the lower drum. . Further, in the method of the present invention described above, in the vibratory trough having a water outlet at one end, 0.2 to 0.2.
Adjusting the porosity of the porous partition plate having a large number of holes having a diameter of 4.0 mm, and / or adjusting the inclination angle of the trough in the range of 1 to 10 degrees so that the water outlet side is downward, It is desirable to separate the slag and the water after the separation, so that the weight ratio of water / slag is in the range of 0.2 to 2.0.

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

In the method of the present invention, slag crushed by a vibrating crusher may be transported by a slag transporter. In the method of the present invention, the slag from which the magnetized material and water have been separated may be transported by a slag transporter, introduced into a hot water treatment machine, and subjected to a heating and stirring process. Further, in the method of the present invention, the slag from which the magnetized material and water are separated is introduced into a vibratory crusher, and the slag crushed by the vibratory crusher is transported by a slag transporter to a hot water treatment machine. And a heating and stirring process may be performed.

A slag reforming apparatus according to the present invention comprises a slag supply apparatus having a first water sprinkler for spraying water on molten slag, and a metal iron contained in the slag supplied from the slag supply apparatus. A magnetic separator drum for removing the main magnetic material, a second watering device for spraying water from both sides of the magnetic separator drum, and a slag and a magnetic material provided at a lower portion of the magnetic separator drum. And a magnetic separator having a separation device for separating the magnetic flux. In the above-described apparatus of the present invention, it is preferable that the second watering device for spraying water on both sides of the magnetic separator drum is provided at two upper portions of the magnetic separator.

[0013] In the apparatus of the present invention, the separating device provided below the magnetic separator drum may be a fixed separating device comprising a soft material plate or a brush, or a soft material plate or a brush. It is desirable to adopt a configuration that is one of the rotation separation devices attached to the rotation shaft.
In this case, it is preferable 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-described apparatus of the present invention, it is preferable that the magnetic separator is composed of upper and lower two-stage magnetic separator drums, and the upper drum rotates at a higher peripheral speed than the lower drum. Further, in the above-mentioned device of the present invention, the third watering device provided at the upper part of the trough, the water outlet provided at one end of the trough,
And a perforated partition plate having a large number of holes having a diameter of 4.0 mm, and the inclination angle of the trough is 1 to 10 so that the water outlet side is downward.
It is preferable that a solid-liquid adjusting device including a vibrating trough inclined in a range of degrees is provided below the magnetic separator.

Further, in the above-mentioned apparatus of the present invention, it is preferable that a vibration-type crusher is provided at a subsequent stage of the magnetic separator through a solid-liquid adjusting device. In this case, it is desirable to use a vibrating crusher using a rod as the vibrating crusher. Further, in the above device of the present invention,
A hot-water treatment machine having a slurry supply means for adding a lime slurry to the slag and performing a slag stirring process while heating the slag using either steam or hot air as a heat source; In some cases. Further, in the above-described apparatus of the present invention, the apparatus of the present invention has a slurry supply means for adding lime slurry to the slag, and a hot water for performing a slag stirring process while heating the slag using either steam or hot air as a heat source. It is desirable that the processor is provided at a stage subsequent to the vibrating crusher.

In the apparatus of the present invention, there is a case where a slag carrier is connected to a stage subsequent to the vibrating crusher. In some cases, the apparatus of the present invention has a configuration in which a hot water treatment machine is connected to a solid-liquid adjusting device via a slag transporter. Further, in the apparatus of the present invention, a configuration may be employed in which a hot water treatment machine is connected to the vibration type crusher via a slag conveyor.

As described above, the water / slag weight ratio is in the range of 0.2 to 2.0, preferably 0.4, in order to exhibit a stable treatment effect irrespective of the iron content in the slag. ~
Water is sprayed (sprinkled) on the slag in the slag supply device so as to be in the range of 1.5. When the weight ratio of water / slag is less than 0.2, the dispersion of the slag is poor, and the treatment effect is poor. On the other hand, when the weight ratio of water / slag exceeds 2.0, the throughput of the slag decreases, and the amount of water is large. Required and wastewater treatment costs rise. In addition, in order to achieve stable discharge of slag and iron,
Water is sprayed from the top of the magnetic separator on both sides of the magnetic separator so that the weight ratio of water / slag is in the range of 0.2 to 2.0, preferably 0.4 to 1.5. I 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 cost of wastewater treatment increases. If water cannot be sprayed (sprinkled) on both sides of the magnetic separator drum, iron cannot be discharged even if slag can be discharged. For this reason, for example, it is preferable to spray (spray) water on the magnetic separator drum from the two upper portions of the magnetic separator. Further, in order to secure a high recovery rate of the slag and reduce the content of the magnetized material 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 preferable to set the range. When the peripheral speed of the magnetic separator drum is less than 3 m / s, the magnetic separation processing capacity is low. On the other hand, when the peripheral speed is more than 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 recovery rate of the slag and reduce the content of the magnetized material 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 mm lower than the lower drum. It is preferable to configure so as to rotate at a peripheral speed of three times, desirably 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 capacity is reduced. On the other hand, when it exceeds three times, the slag recovery rate decreases and the amount of magnetized material in the recovered slag increases.

Further, in order to transport the slag stably and to increase the fine particles in the slag to broaden the particle size distribution and to secure a predetermined particle size, the weight ratio of water / slag is 0.1%.
After adjusting so as to be in the range of 2 to 2.0, desirably in the range of 0.4 to 1.5, it is preferable to crush the slag using a vibrating crusher using a rod. water/
When the weight ratio of the slag is less than 0.2, the transport of the slag is unstable, and the supply and discharge portions of the slag may be blocked, and the dispersion of the raw material becomes unstable, and the crushing effect is not stable. . On the other hand, if it exceeds 2.0, the crushing effect becomes insufficient, fine particles cannot be secured, and a wide range of particle sizes cannot be achieved. 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 2.0.
The inclination angle of the trough is set to 1 to 10 so as to be in the range of 1.5.
When adjusting in the range of degrees, the weight ratio of water / slag is 0.2
If less than, spray water (sprinkling) in the vibrating trough,
In addition, the inclination angle of the trough is reduced or the aperture ratio of the porous partition plate is reduced. On the other hand, when it exceeds 2.0, the inclination angle of the trough is made steep or the opening 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 opening ratio of the porous partition plate, the size of the holes 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 diameter is less than 0.2 mm, the clogging of the porous partition plate proceeds, and solid-liquid separation becomes poor. On the other hand, when the hole diameter exceeds 4.0 mm, the amount of slag that migrates to water through the holes increases, and the slag recovery rate decreases. In addition, if the particle size of the raw material fluctuates greatly, the crushing process is performed by adjusting the vibration width of the vibrating crusher by the motor frequency or the like.If the raw material particle size is small, the vibration width of the crusher is reduced. When the raw material particle size is large, the vibration width of the crusher is increased.

Further, in order that the slag can be transported stably and a sufficient surface treatment effect by the hot water treatment can be achieved, the weight ratio of water / slag is 0.2.
It is preferable that the slag is adjusted to a range of from 2.0 to 2.0, desirably from 0.4 to 1.5, and then the slag is subjected to hot water treatment using a hot water treatment machine. When the weight ratio of water / slag is less than 0.2, it is difficult to transport the slag stably, and the surface treatment effect by the hot water treatment is insufficient. Required and wastewater treatment costs rise. Also, in order to obtain a slag with good hydrophilicity, and easy to construct as civil engineering materials, etc., to obtain a slag having a strength equal to or higher than natural aggregate as a concrete aggregate, add a lime slurry to the slag, pH
Is in the range of 9.0 to 12.5, desirably 10.0 to 1
It is preferable that the slag is adjusted to be in the 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. On the other hand, when the pH exceeds 12.5, the surface of the slag becomes brittle, and the weight loss due to abrasion increases, When used as concrete aggregate, etc., the adhesive force with cement decreases. Further, in order to economically achieve a sufficient surface treatment effect by the hot water treatment, the slag is heated to 60 to 100 ° C. using a hot water treatment machine, preferably,
While heating to 80 to 98 ° C, the slag is stirred for 0.5 minute.
It is preferably performed for up to 5 hours, preferably for 1 to 3 hours. When the heating temperature is lower than 60 ° C., the surface treatment effect is insufficient. On the other hand, when the temperature is higher than 100 ° C., the processing apparatus becomes expensive. When the treatment time is less than 0.5 hr, the surface treatment effect is insufficient, while when it exceeds 5 hr, the treatment apparatus becomes expensive. In addition, in order to secure stable transport of the slag and achieve a uniform surface treatment, it is preferable to perform a slag stirring process. If the stirring treatment is not performed, the surface treatment effect is insufficient, and it is difficult to transport the slag stably.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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, reference numeral 10 denotes a slag supply device, which includes a raw material slag hopper 12, a first water sprinkler 14, a vibration feeder 16, and a vibration device 18. Reference numeral 20 denotes a magnetic separator, which includes magnetic separator drums 26 and 28 formed of rotating drums having fixed magnets 22 and 24, and slag-iron separators 30 and 32 provided at a substantially central portion below the magnetic separator drum. Have. Raw material slag hopper 12
When the molten slag charged into the slag moves through the vibrating feeder 16 provided substantially horizontally, water is sprayed (sprayed) by the first watering device 14 and the weight ratio of water / slag is 0.2 to 0.2.
It is adjusted so as to be in the range of 2.0, preferably in the range of 0.4 to 1.5. This slug is supplied to the vibration feeder 16.
Is supplied to the upper end portion of the upper magnetic separator drum 26 from the outlet of the magnetic separator 20, and water is sprayed (sprayed) from the second water sprinklers 34 provided at the upper two places of the magnetic separator 20, and the weight ratio of water / slag is reduced. 0.2 to 2.0, desirably 0.4 to 1.5
It is adjusted to be within the range. In the present embodiment, two second watering devices 34 are provided. However, if the water can be watered on both sides of the magnetic separator drum, one or three or more second watering devices 34 are provided. No problem.
For example, when the second watering device 34 is provided at one location above the magnetic separator 20, the configuration is as shown in FIG. The slag supplied on the upper magnetic separator drum 26 is supplied to the lower magnetic separator drum 28 after the magnetized material such as iron is separated from the slag by the slag-iron separator 30 and further supplied to the slag-iron. The separating device 32 separates the slag from a magnetized material such as iron. 33 and 35 are guide plates. The slag from which the magnetized material such as iron is separated is sent to the solid-liquid adjusting device 38, and the magnetized material such as iron is discharged from the iron outlet 36. The magnetic separator drums 26 and 28 provided in the upper and lower two stages are arranged such that the upper magnetic separator drum 26 has a peripheral speed of 50 m / s or less, preferably 5 to 20 m / s.
And the peripheral speed of the lower magnetic separator drum 28 is 1.
It is adjusted so as to be 1 to 3 times, preferably 1.5 to 2.5 times. By adjusting in this manner, a slag recovery rate of 96% or more can be ensured, and the content of the magnetized material in the slag can be suppressed to 0.04% or less regardless of the raw material characteristics. In the present embodiment, the magnetic separator drums are provided in two upper and lower stages. However, it is of course possible to adopt a configuration in which one or three or more magnetic separator drums are provided. As the slag-iron separation devices 30 and 32, for example, a fixed separation device made of a soft material plate or a brush,
Alternatively, a rotary separating device in which a soft material plate or a brush is attached to a rotating shaft is used. The material of the soft material plate is, for example, rubber, soft plastic, or the like, and the material of the brush is, for example, nylon thread.

The slag supplied to the solid-liquid adjusting device 38 is:
In a vibrating trough 42 having a water outlet 40 at one end, slag and water are separated and the weight ratio of water / slag is in the range of 0.2 to 2.0, preferably 0.4 to 1.5. It is adjusted to be within the range. In this case, the inclination angle of the trough 42 is 1 to 10 such that the water outlet 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, desirably 1.0 to 3.0 mm adjusted in a range of degrees.
4 is also adjusted. That is, when the weight ratio of water / slag is less than 0.2, water is sprayed (sprayed) into the vibrating trough 42 by the third watering device 37 provided above the trough 42 and Or the opening ratio 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. 4
6 is a vibration device. In addition, as the porous partition plate 44,
As an example, a perforated plate made of plastic, metal, ceramic, or the like, a net 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 vibratory crusher 48 using a rod, and slag is crushed. In this case, if the particle size of the raw material fluctuates greatly, the crushing process is performed by adjusting the vibration width of the vibrating crusher 48 with a motor frequency or the like. 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 performing the crushing treatment in this manner, fine particles in the slag can be increased and the particle size distribution can be widened. In addition, as the vibrating crusher 48, one using a rod is preferable, but another vibrating crusher can also be used.

The slag crushed by the vibrating crusher 48 is transferred by a slag transfer device 50 such as a bucket conveyor and supplied to a hot water treatment device 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 .5 is adjusted,
Further, 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 is heated for 0.5 to 5 hours, preferably 1 to 50 ° C. A hot water treatment for ~ 3 hours is performed. Slag that has been subjected to hot water treatment has been subjected to sufficient surface treatment,
After passing through the screw type discharger 62, it is discharged from the reformed slag discharge port 64 as reformed slag. 66 is a jacket, and 68 is a drain outlet. Instead of adding the lime slurry, it is also possible to adjust the pH by adding a cement slurry, a dolomite slurry, a blast furnace slag slurry or the like.

FIG. 2 schematically shows a slag reforming apparatus according to a second embodiment of the present invention. In the second embodiment of the present invention, a hot water treatment device 54 using hot air as a heat source is used instead of the hot water treatment device 52 using steam as a heat source. 70 is a hot air discharge port. Other configurations and operations are the same as those in the first embodiment of the present invention. In the hot water treatment apparatus, it is of course possible to use a heat source other than steam and hot air. 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 different from the first embodiment of the present invention in that the slag crushed by the vibrating crusher 48 is subjected to hot water treatment using steam as a heat source without providing the slag conveyor 50. This is a case where 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 a fourth embodiment of the present invention. The fourth embodiment of the present invention is different from the second embodiment of the present invention in that the slag crushed by the vibrating crusher 48 is subjected to hot water treatment using hot air as a heat source without providing the slag conveyor 50. Machine 54
Is directly supplied to the Other configurations and operations are the same as those in the first and second embodiments of the present invention.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention and comparative examples will be described below. A reforming test was performed using slag having the characteristics (properties) shown in Table 1.

[0024]

[Table 1]

Example 1 Water was sprinkled on slag A having a Pb content of 150 mg / kg, and the upper end of a single-stage magnetic separator rotating at a peripheral speed of 15 m / s with a water / slag weight ratio of 1.5. Slag is supplied to the drum at a rate of 200 kg / hr, and a total of 1.0 times the amount of slag supplied to the drum is sprinkled from the upper part of the drum onto the drum to perform a magnetic separation process. 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 the slag was 96.8%.

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

Example 3 Water was sprinkled on the slag C to supply 200 kg / hr of slag to the upper end of a single-stage magnetic separator rotating at a peripheral speed of 20 m / s with a water / slag weight ratio of 0.5. And then the drum top 2
Water is sprayed onto the drum in an amount of 0.5 times the slag supply amount in total from the location to perform a magnetic separation process, and the slag having a water / slag weight ratio of 0.24 and an iron content of 0.020% is passed through a solid-liquid adjusting device. I got The recovery rate of the 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, and the particle size range was widened, and a modified CBR higher than that of natural river sand could be secured.

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 grain size range was widened, and a modified CBR higher than that of natural river sand could be secured.

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

Example 7 200 kg / hr of the slag obtained in Example 5 is transported to a hot water treatment machine by a bucket conveyor, and 2% lime slurry is added in an amount corresponding to 10% of the slag supply amount (dry base). At the same time, steam at 110 ° C. is supplied to a horizontal hot water processor having a stirrer (screw), and the mixture is treated for 1.0 hour at 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 the modified CBR and mortar strength more than natural river sand could be secured.

Comparative Example 1 200 kg / hr was supplied to the upper end of a single-stage magnetic separator rotating at a peripheral speed of 15 m / s without sprinkling water on the slag A, and slag was supplied in total from two locations above the drum. 1.0 of quantity
Twice the volume of water was sprinkled on the drum to perform a magnetic separation process, and a slag having a water / slag weight ratio of 0.29 and a magnetized material content of 2.6% was obtained through a solid-liquid adjusting device. The slag collection rate was 7
2.2%.

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

[0034]

[Table 2]

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

[0036]

As described above, the present invention has the following effects. (1) By performing the magnetic separation process with a magnetic separator equipped with a function of adjusting the water / slag weight ratio, etc., the iron and iron can be highly efficiently used together with iron regardless of fluctuations in the amount of magnetized material and water in the raw slag.
Magnetized materials containing a large amount of heavy metals such as b and Cr can be removed, and slag can be rendered harmless and quality can be stabilized. (2) When the crushing process is performed with a vibrating crusher equipped with a function of adjusting the water / slag weight ratio, the particle size of the raw material slag,
A slag having a wide range of particle sizes can be obtained irrespective of a change in the amount of moisture, and slag quality can be stabilized and slag quality can be improved. (3) When the hot water treatment is performed while stirring the slag surface under high pH hot water, the hydrophilicity of the slag surface is improved, and a material having a quality equivalent to that of natural sand or more is obtained as a construction material. (4) Slag of predetermined quality can be stably supplied by appropriately combining magnetic separation, crushing, and hot water treatment according to the state of aggregate in the region or the quality of slag. (5) The quality of the slag is improved by the slag reform, and the slag is detoxified.
We can expect an increase in 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, fishery materials, etc.

[Brief description of the 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 illustrating 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 where a second watering device is provided at one location above the magnetic separator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Slag supply apparatus 12 Raw material slag hopper 14 1st water sprinkler 16 Vibration feeder 18, 46 Vibration apparatus 20 Magnetic separator 22, 24 Fixed magnet 26, 28 Magnetic separator drum 30, 32 Slag-iron separation apparatus 33, 35 Guide plate 34 Second Watering device 36 Iron outlet 37 Third watering device 38 Solid-liquid adjusting device 40 Water outlet 42 Vibrating trough 44 Perforated partition plate 48 Vibratory crusher 50 Slag conveyor 52, 54 Hot water treatment machine 56 Slag supply port 58 Slurry Supply means 60 Stirrer 62 Screw discharger 64 Reformed slag discharge port 66 Jacket 68 Drain discharge port 70 Hot air discharge port

──────────────────────────────────────────────────続 き Continued on the front page (72) Akira Kaga, Inventor 1-3-1, Higashikawasaki-cho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (56) References JP-A-5-255714 (JP, A) 54-86496 (JP, A) JP-A-5-123605 (JP, A) JP-A 8-80483 (JP, A) JP-A 9-59046 (JP, A) (58) Int.Cl. ⁶ , DB name) B09B 5/00 B03C 1/10 C04B 5/00 C04B 18/04 C21B 3/06

Claims (24)

(57) [Claims] 1. A slag supply apparatus in which a weight ratio of water / slag is in a range of 0.2 to 2.0 in order to remove a magnetized substance mainly composed of metallic iron contained in molten slag. After water was sprayed on the slag, the slag was supplied to the upper end of the magnetic separator drum, and then the weight ratio of water / slag was 0.2%.
Water is sprayed from the upper part of the magnetic separator to both sides of the magnetic separator drum so as to be in the range of 2.0 to 2.0, and the slag and the magnetized material are separated by a separator at the lower part of the magnetic separator drum. Quality way. 2. The slag reforming method according to claim 1, wherein water is sprayed from both upper portions of the magnetic separator to both sides of the magnetic separator drum. 3. The slag reforming method according to claim 1, wherein the peripheral speed of the magnetic separator drum is in a range of 3 to 50 m / s. 4. A fixed separating device comprising a soft material plate and a brush provided at a lower portion of the magnetic separator drum, and a rotary separating device having a soft material plate and a brush attached to a rotating shaft. 4. The slag reforming method according to claim 1, wherein the slag and the magnetized material are separated. 5. The slag according to claim 1, wherein the magnetic separator drums are provided in two upper and lower stages, and the upper drum rotates at a peripheral speed of 1.1 to 3 times the lower drum. Reforming method. 6. Adjusting the porosity of a porous partition plate having a large number of holes having a diameter of 0.2 to 4.0 mm in a vibrating trough having a water outlet at one end, and / or adjusting the inclination angle of the trough. The slag and water after the magnetized material is separated by adjusting the water outlet side downward in the range of 1 to 10 degrees,
The slag reforming method according to any one of claims 1 to 5, wherein a weight ratio of the slag is in a range of 0.2 to 2.0. 7. The slag according to claim 1, wherein the water / slag weight ratio in the slag is adjusted to be in the range of 0.2 to 2.0, and then the slag is crushed using a vibrating crusher. The slag reforming method according to any one of the above. 8. After the slag and the magnetized material are separated, a lime slurry is added to the slag to reduce the weight ratio of water / slag to 0.
The pH is adjusted so as to be in the range of 2 to 2.0 and the pH is in the range of 9.0 to 12.5. 10
The slag reforming method according to any one of claims 1 to 7, wherein the slag is stirred for 0.5 to 5 hours while heating to 0 ° C. 9. The slag reforming method according to claim 7, wherein the slag crushed by the vibrating crusher is transported by a slag transporter. 10. A slag from which a magnetized substance and water are separated,
Conveyed by a slag conveyor, introduced into a hot water treatment machine and heated
9. The slag reforming method according to claim 8, wherein a stirring treatment is performed. 11. A slag from which magnetized material and water have been separated is introduced into a vibratory crusher, and the slag crushed by the vibratory crusher is transported by a slag transporter and introduced into a hot water treatment machine. 9. The method for reforming slag according to claim 8, wherein a heating and stirring treatment is performed. 12. A first method for spraying water on molten slag.
A slag supply device having a water sprinkling device; a magnetic separator drum for removing magnetized material mainly composed of metallic iron contained in the slag supplied from the slag supply device; and water on both sides of the magnetic separator drum from above. A second watering device for spraying, and a lower part of the magnetic separator drum,
A slag reformer, comprising: a magnetic separator having a separation device for separating slag and a magnetized material. 13. The slag reforming apparatus according to claim 12, wherein second sprinklers for spraying water on both sides of the magnetic separator drum are provided at two upper portions of the magnetic separator. 14. A separation device provided at a lower portion of the magnetic separator drum, wherein the separation device comprises a soft material plate or a brush, and the rotary separation device comprises a soft material plate or a brush attached to a rotating shaft. The slag reforming apparatus according to claim 12 or 13, wherein 15. The slag reforming apparatus according to claim 14, wherein the material of the soft material plate is one of rubber and soft plastic, and the material of the brush is nylon thread. 16. The slag according to claim 12, wherein the magnetic separator comprises two upper and lower magnetic separator drums, and the upper drum rotates at a higher peripheral speed than the lower drum. Reformer. 17. A third watering device provided at an upper portion of the trough, a water outlet provided at one end of the trough,
A perforated partition plate having a large number of holes having a diameter of ~ 4.0 mm,
Inclination angle of trough 1-1 so that water outlet side is down
The slag reforming apparatus according to any one of claims 12 to 16, further comprising a solid-liquid adjusting device including a vibrating trough inclined in a range of 0 degrees below the magnetic separator. 18. The slag reforming apparatus according to claim 17, further comprising a vibrating crusher provided at a subsequent stage of the magnetic separator through a solid-liquid adjusting device. 19. The slag reforming apparatus according to claim 18, wherein the vibrating crusher is a vibrating crusher using a rod. 20. A hot water treatment machine having a slurry supply means for adding a lime slurry to slag for performing a slag stirring treatment while heating the slag using either steam or hot air as a heat source, comprising: The slag reforming apparatus according to claim 17, which is provided at a stage subsequent to the liquid conditioning apparatus. 21. A hot water treatment machine having a slurry supply means for adding a lime slurry to slag for performing a slag stirring process while heating the slag by using either steam or hot air as a heat source. The slag reforming apparatus according to claim 18 or 19, which is provided at a subsequent stage of the crusher. 22. The slag reformer according to claim 18, wherein a slag conveyor is connected to a stage subsequent to the vibrating crusher. 23. The slag reforming apparatus according to claim 20, wherein a hot water treatment device is connected to the solid-liquid adjusting device via a slag conveying device. 24. The slag reforming apparatus according to claim 21, wherein a hot water treatment device is connected to the vibrating crusher via a slag conveying device.