JPS6054255B2 - Water slag manufacturing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for producing slag.

Conventionally, slag taken out from a metal smelting furnace is discharged from a slag opening and cooled naturally to form a lumpy slag, or it is blown with pressurized air or steam to form slag fibers, or it is flowed out at high speed over a stream of water. The water is then treated by dropping it into water slag, which is then used in various ways.

The conventional water slag production equipment is shown in Figure 1, and its flow sheet is shown in Figure 2.
As shown in the figure.

To outline the process with reference to FIGS. 1 and 2, the slag slurry 2 coming out of the blowing device 1 falls into the slag tank 3, and the overflow water containing the slag is stored in the overflow tank 4.

The settled slurry is fed from the bottom of the overflow tank 4 by a slurry pump into a system that communicates with the settling tank 5 via the dehydration tank 6, and the concentrated slurry is further fed from the bottom of the settling tank 5 to the dehydration tank 6 by a slurry pump. , dehydrated to become product slag. Also, clean water is fed from the settling tank 5 to the cooling tower 7 as pressure injection water for blowing, and is stored in the cold water tank 8 as cooling water.

Further, the slurry settled at the bottom of the water slag tank 3 is fed to the dewatering tank 6 by a slurry pump.

The above is a conventional general water slag manufacturing apparatus, but it had the following drawbacks.

In other words, with conventional equipment, it is necessary to secure a large amount of pressure-injected water at the time of startup, and during operation, in order to deal with temporal fluctuations in the amount of slag generated from the smelting furnace or various problems, The water ratio (amount of pressure-injected water/slag) was set, so the capacity of the cold water tank that supplies the pressure-injected water had to be increased.

In other examples, clean water for pressure injection water is separately supplied from outside the circulation path, especially at startup. In addition, in conventional equipment, each tank is often installed independently, so pumps have to be relied upon to transport slurry and water between each type. As a result, the conventional equipment. As the equipment became larger and the cost of electricity increased, it was inevitable that the price of water slag would rise. The present invention eliminates the drawbacks of these conventional water slag production devices, reduces the capacity of the water tank, and produces slurry.
Improves the efficiency of water transportation and also prevents the amount of slag from fluctuating during operation! This was done for the purpose of providing a water slag production device that can automatically control the amount of water.

Next, the present invention will be specifically explained based on embodiments shown in the drawings. FIG. 3 shows an embodiment of the water slag manufacturing apparatus according to the present invention.
FIG. 4 is a cross-sectional view showing the flow sheet.

From Figures 3 and 4, the slag slurry of uniform particle size obtained by atomizing the slag at an appropriate temperature with pressure-injected water at an appropriate temperature, speed, and water volume is passed through the blowing gutter 9 to the slag tank 10. The slag slurry from the slag tank 10 flows directly into one end of the settling tank 12 having two slag scraping devices 11, while the concentrated slurry is fed from the lower part to the dewatering tank 13 by a slurry pump. do.

The clean water in the settling tank 12 is made to flow into one hot water tank 14b constituting the water storage tank 14, and the lower part of the hot water tank 14b and the water storage tank 14 are
The lower part of the other cold water tank 14a constituting the cold water tank 14 is brought into communication.

The cold water tank 14a stores the cooled water obtained by supplying hot water from the hot water tank 14b to the cooling tower 15, and supplies water from the lower part thereof to a blowing device (shown in the figure) as pressure injection water using a pump. Further, the water separated from the water dregs in the dewatering tank 13 is fed to the settling tank 12.

Here, the feature of the present invention is that the water slag slurry is directly flowed from the water slag tank into the settling tank without being stored in the overflow tank, and the clean water separated from the concentrated slurry in the settling tank is flowed out to the hot water tank. The water level of the sedimentation tank and the hot water tank is the same, and the hot water tank and the cold water tank that stores cooling water from the cooling tower are connected to each other.

The reason why the settling tank and the hot water tank are kept at the same water level and in communication with the hot water tank is as follows.

An imbalance in the amount of water in the slag production equipment occurs when starting up.
This occurs during stoppages, emergencies, etc., and with conventional equipment, a large-capacity water tank was installed as a countermeasure for such cases, but even with a compact water tank, the amount of water that is injected during such times, for example, can be reduced. This is to enable security.

Generally, the amount of slag flowing into the blowing device is extremely unstable, as can be seen from the state of the slag coming out of the blast furnace, and the maximum value of the fluctuation amount is more than 2 to 3 times the average amount.

In this case, in order to maintain an appropriate water ratio set in advance, it is necessary to inject water at a pressure that follows the fluctuation amount.
It is necessary to secure cooling water.

In conventional equipment, a large amount of pressure-injected water is supplied by setting a high water ratio in advance in anticipation of fluctuations.Therefore, the water volume is not controlled according to fluctuations, and as a result, large-scale cold water tanks are required. etc. were established. In the present invention, in addition to performing water flow control that follows fluctuations, the necessary cold water tank water level is always maintained by communicating between the hot water tank and the cold water tank.
Pressure injection water can be supplied according to the amount of fluctuation.

Furthermore, even if the cold water tank water level drops during startup, water will naturally flow in from the hot water tank, preventing pump troubles due to the drop. Incidentally, the fluctuation in the amount of slag can be detected by using an ammeter attached to a slag scraping device disposed in the settling tank, which will be described later, from changes in the load applied to the device.

Or ammeter fluctuation of the slag pump, change in slag tank water temperature,
It is also possible to detect from fluctuations caused by rising water level in the sedimentation tank. Further, in the present invention, the overflow tank is removed and the water slag slurry is directly flowed into the settling tank, and a pump for extracting the slurry from the overflow tank is not required, so it is possible to reduce the number of pumps, etc., and thus reduce power costs.

Furthermore, in the present invention, the water storage tank is composed of two, a hot water tank and a cold water tank, and this is to maintain the water temperature at an appropriate low temperature when the circulating water is used as pressure injection water.

In other words, the hot water flowing into the hot water tank from the settling tank is sent to the cooling tower and cooled, and then the cold water is stored in a cold water tank that is separate from the hot water tank (but is in communication with it), so that it can be used as pressure injection water. It is necessary to maintain the water temperature at a suitable low temperature when using it. Next, the sedimentation tank will be explained according to FIG.

First, as mentioned above, its function is to allow the water slag slurry from the water slag tank to flow into one end of the settling tank, to flow clean water into the hot water tank from the upper right end, and to supply the concentrated slurry from the bottom to the dehydration tank. be. Its shape is rectangular, and two slag scraping devices are arranged in the clean water outflow direction. A conventional settling tank has a water dregs slurry supply port in the center and a clean water discharge port on the periphery, and has a circular or substantially circular shape. In such a sedimentation tank, the radius of the raking device: r is the natural sedimentation distance: e is equal, and naturally the diameter of the sedimentation tank is twice that of e, and if the load becomes even larger, multiple sedimentation tanks are installed, etc. The sedimentation tank was made unnecessarily large, resulting in high equipment costs.

Therefore, as shown in the above-mentioned example, a desirable structure for the settling tank is to effectively utilize the scraping device within the necessary natural slurry settling distance, and to allow the water slag slurry to flow in from one end and from the top of the other end. The tank has a rectangular shape that takes into account the effective area, and the capacity to handle large loads is distributed between two slag scraping devices, making the settling tank more efficient and compact. It is something.

Other embodiments include providing a plurality of raking devices as shown in FIG. 6, or, depending on the application, providing no such device.

The embodiments of the present invention have been described above, and the slag tank, sedimentation tank, and water storage tank are installed within an integral outer frame with a common wall.

As another embodiment, it is also possible to communicate the side wall between the settling tank and the hot water tank.

This is because if a pipe blockage occurs between the water slag tank and the dewatering tank, the water level in the sedimentation tank will drop, and the water levels in the hot and cold water tanks will also drop, making it difficult to secure a water supply for blowing. In this case, by communicating the above-mentioned sedimentation tank and hot water tank, water supply for blowing can be secured, albeit temporarily. As another embodiment, it is possible to treat the entire slurry in the sedimentation tank without settling it in the sedimentation tank, and in this case, a slurry pump is not required and the power cost is reduced.

If the load on the sedimentation tank exceeds the allowable limit, the slag slurry can be extracted from the bottom of the slag tank and fed to the dewatering tank as usual. In yet another embodiment, when cavitation or blockage occurs in the slurry pump installed at the bottom of the slag tank, cooling water from the cold water tank is automatically flowed into the slag tank to increase pressure and water volume, thereby solving the above problem. The aim is to quickly resolve the problem and recover.

In the past, this was done manually and took time to recover, but it is automatically detected and done. The detection method is based on an increase in the water level in the slag tank or an increase in the temperature of the slurry due to a decrease in the amount of pumped water. To summarize the effects of the above and other embodiments, all the water slag slurry is processed in the settling tank, which reduces electricity costs and the number of pumps. Recovery actions may be performed under automatic control.

As detailed above in the embodiments and other embodiments of the present invention,
New sedimentation tank and slag tank, sedimentation tank, water storage tank, (hot water tank,
By organically combining the cold water tanks) and installing them within an integral outer frame, we not only provide a compact slag production device without affecting the processing capacity, but also automatically control the water volume to follow the fluctuations in the slag amount. In addition, we have achieved reductions in electricity costs by reducing the number of pumps, reduction in equipment space by making it more compact, reduction in construction costs for water tanks, and rapid recovery by automatic water flow control in the event of trouble with the slurry pump in the water slag tank. It provides an unprecedented and innovative method and equipment for producing water slag, and in today's world where energy and resource conservation are being called for, it truly meets the demands of the times and can be said to be of extremely high value.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional slag production device, Fig. 2 is a flow sheet of the conventional device, Fig. 3 is a sectional view showing the slag production device of the present invention, and Fig. 4 is a flowchart of the device of the present invention. FIG. 5 is a schematic plan view showing a conventional settling tank and a settling tank according to the present invention, and FIG. 6 is a schematic cross-sectional view showing another embodiment of the present invention. The main symbols in the figure are as follows. 9: Blown gutter, 10: Slag tank, 12: Sedimentation tank, 13: Dehydration tank, 14: Water storage tank, 14a: Cold water tank, 14b: Hot water tank,
15: Cooling tower.

Claims (1)

[Scope of Claims] 1. A method for producing a slag that obtains a slag by solid-liquid separation of a slag slurry obtained by injecting pressurized water onto the slag, wherein the slag slurry after the pressure water injection is sprayed. After the slag is once stored in a slag tank through a gutter, the slag is connected to the slag tank via a common wall and extends in a rectangular shape, and is provided with a sludge collection device and a sludge collection chamber in the longitudinal direction of the rectangular shape. A water slag slurry is caused to directly flow into the sedimentation tank from a common wall connecting part with the water slag tank of a sedimentation tank in which a plurality of parts are arranged in series, and the water slag slurry is made to flow into the sedimentation tank in stages in each of the plurality of sedimentation parts in the sedimentation tank. Sedimentation concentrated slurry and floating clean water are separated, and the clean water is temporarily stored in a connected hot water tank so that the water level is the same as the water level of the settling tank as it flows in, and then communicated with the hot water tank. The water is cooled in a cooling tower installed above the cold water tank, stored in the cold water tank, and supplied as the pressure water as needed, while the sedimented concentrated water slag slurry is dehydrated to obtain water slag. A water slag manufacturing method characterized by: 2. A slag tank that stores the slag slurry from the blowing gutter, and a sediment tank that is connected to the slag tank and extends in a rectangular shape, and that is equipped with a sludge collection device and a sludge collection chamber in the longitudinal direction of the rectangular shape. A plurality of them are arranged in series, and the water slag slurry is made to flow directly into the sedimentation tank from the connection part with the water slag tank, and the sedimentation and concentrated slurry are respectively mixed in stages in the plurality of settling parts in the sedimentation tank. A sedimentation tank that separates the floating clean water and drains the clean water from the upper part and extracts the concentrated slurry from the lower part, a hot water tank that stores the clean water that flows out of the sedimentation tank, and a cooling water from the cooling tower that stores it. A water storage tank comprising a cooling tank and communicating the hot water tank and the cold water tank, a cooling tower that cools the hot water in the hot water tank and sends it as cooling water to the cold water tank, and at least a lower part of the settling tank. and a dehydration tank for dewatering the water slag slurry extracted from the water slag, and the water slag tank, sedimentation tank, and water storage tank are installed in an integral outer frame with a common wall. Slag manufacturing equipment.