JPH10251044A - Production of granulated and water granulated slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to granulate the shapes of water granulated slag and to increase the grain sizes of the slag by specifying the water temps. of injection water for water granulation of molten slag and a storage water tank of the water granulated slag. SOLUTION: Incineration ashes, such as waste incineration ashes, are supplied to an ash melting furnace 10 and are heated and melted by a torch 12, by which the incineration ashes are melt treated and the molten slag is obtd. While the molten slag is sent from the outlet 14 of the ash melting furnace to the storage water tank 16, the water in the storage water tank 16 is injected from a nozzle 17 by a granulation water injection pump 18 to granulate the molten slag and to cool the slag. The water granulated slag subjected to the cooling is dropped into the storage water tank 16. The water temps. of the injection water and the storage water tank 16 are controlled to 60 to 85 deg.C, more preferably 65 to 80 deg.C by controlling a circulating water flow control valve 21 via a temp. indication controller 20. The water is sent from a cooling column 22 to the storage water tank 16. The cooling water is circulated to the storage water tank 16 by the granulation water injection pump 18 and a granulation water circulating pump 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to granulating the shape of granulated slag by controlling the temperature of water when granulating molten slag from an ash melting furnace for waste incineration ash or the like within a certain range. How to do it.

[0002]

2. Description of the Related Art Slag obtained by subjecting molten slag that has been subjected to melting treatment in an ash melting furnace to granulation is called granulated slag. As shown in FIG. 3, a general granulated slag is needle-like or massive. It is. Conventionally, the temperature of water used for granulation is
Generally, the temperature was in the range of 0 to 45 ° C, but the granulated slag obtained by setting the temperature of the granulated water to 0 to 45 ° C becomes acicular or massive, and the slag having a particle size of less than 1 mm is, for example, 45 ° C. In the case of the above, it was a fine lump occupying 46% or more.

[0003] JP-B-51-15056 describes a method for producing high quality slag slag by injecting high-pressure water into molten slag discharged from a melting furnace to effectively perform quenching and granulation. Have been. Japanese Patent Publication No. 59-25143 describes a method in which molten slag is subdivided with pressurized water having an appropriate amount of water and a water pressure, and is granulated by rapid cooling to obtain granulated slag. Japanese Patent Application Laid-Open No. 54-155662 describes a method for producing a slag by heating and melting incinerated ash of sludge or dust to form a slag, and granulating the slag to produce a slag slag. Japanese Patent Application Laid-Open No. Hei 5-201753 discloses that slag flowing down from a molten slag discharge port of a waste incineration ash melting furnace includes:
An apparatus for spraying water from a watering nozzle whose direction can be changed in response to a change in slag flow to granulate slag is described. Heretofore, there is no document that attempts to granulate the shape of the granulated slag by controlling the temperature of the water used for the granulated treatment to a certain temperature or higher.

[0004]

When the molten slag is granulated to form a sand, the conventional granulated slag is formed into a needle-like or sharp-angled lump. It is necessary to pay close attention to such things as piercing or laceration.

Further, if the granulated slag is in the form of needles or sharp-angled slag, the slag having a small particle size occupies most of the granulated slag. It becomes difficult to apply it to civil engineering and construction materials as a substitute for aggregate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to control the temperature of water for granulating molten slag within a certain range, thereby granulating the granulated slag. Another object of the present invention is to provide a method for increasing the particle size of slag.

[0007]

In order to achieve the above object, a method for producing granulated granulated slag of the present invention is characterized in that a granulated granulated slag is obtained by granulating molten slag into granulated slag. In order to granulate the shape of the slag, the water temperature of the injection water for granulating the molten slag and the water temperature of the storage tank of the granulated slag that falls is characterized by being in the range of 60 to 85 ° C.

According to the present invention, the shape of the granulated slag is granulated by controlling the water temperature of the injection water for granulating the molten slag and the water temperature of the storage tank for the granulated slag that has fallen to a certain temperature or higher. Although the particle size is increased, the water temperature at the time of granulation is maintained in the range of 60 to 85C, preferably in the range of 65 to 80C, as described above. This is because when the water temperature at the time of granulation is less than 60 ° C, there is a problem that most of the granulated slag becomes needle-like or massive, while when the water temperature at the time of granulation exceeds 85 ° C, This is because there is a problem that it is not suitable for cooling the molten slag in practical use.

[0009]

FIG. 1 shows an example of an apparatus for carrying out the method for producing granulated granulated slag of the present invention. In FIG. 1, reference numeral 10 denotes an ash melting furnace, which includes a torch 12 used for a melting process. While the molten slag melt-processed in the ash melting furnace 10 is sent from the ash melting furnace outlet 14 to the storage water tank 16, water in the storage water tank 16 is injected from the nozzle 17 by the granulated water injection pump 18 to be cooled. . Then, the cooled slag falls into the storage water tank 16. The water temperature of the injection water and the storage water tank 16 is controlled in the range of 60 to 85 ° C., preferably in the range of 65 to 80 ° C. by adjusting the circulating water flow control valve 21 via the temperature instruction control device 20, Cooling water is sent from the cooling tower 22 to the storage water tank 16.
The cooling water is circulated to the storage water tank 16 by the granulated water injection pump 18 and the granulated water circulation pump 24, respectively. The granulated slag thus obtained is supplied to the slag conveying device 25.
From the granulated slag carry-out port 26. 28 is a temperature detector.

[0010] Table 1 shows the particle size distribution of the granulated slag when the water temperature at the time of granulating the molten slag was changed.
The left side of each temperature shows the ratio (%) of the range of each particle size, and the right side of each temperature shows the ratio (%) less than each upper limit particle size.
FIG. 2 shows the results of Table 1 in a graph.
If the particle size of the granulated slag is small, it can be said that the slag is in the form of a needle or a sharp angle. If the particle size of the granulated slag is large, it can be said that the slag is granulated.

[0011]

[Table 1]

As can be seen from the results in Table 1, when the water temperature at which the molten slag is granulated is 60 ° C. or higher,
About 60% or more of the massive slag is granulated slag having a particle size of 1 mm or more, and about 50% or more of the granulated slag is granulated. As described above, when the water temperature at the time of granulating the molten slag is 60 ° C. or higher, as shown in FIGS. 4 and 5, there is almost no needle-shaped or sharp-angled slag in the granulated slag.

[0013] By granulating the shape of the granulated slag, it is easy to classify the granulated slag when used as civil engineering and building materials, and the danger in transportation and handling is extremely reduced. In addition, by increasing the particle size of the slag to a large value, it becomes easy to apply it to civil engineering and construction materials as a substitute for natural aggregate.

[0014]

As described above, the present invention has the following effects. (1) Just by controlling the temperature of the water used for the granulation process,
Granulated granulated slag (2) By granulating the granulated slag, the danger in transportation and handling is extremely reduced. (3) By granulating the granulated slag,
Classification when used as building materials, etc. is facilitated. (4) Granulating the shape of the granulated slag and increasing the particle size of the slag greatly facilitates application to civil engineering and construction materials as a substitute for natural aggregate.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of an apparatus for implementing the method for producing granulated granulated slag of the present invention.

FIG. 2 is a graph showing a particle size distribution of the granulated slag when the water temperature at the time of granulating the molten slag is changed.

FIG. 3 is an enlarged photograph showing a particle structure of the granulated slag when the temperature of the granulated slag is 45 ° C. (magnification: 10 ×).

FIG. 4 is an enlarged photograph showing the particle structure of the granulated slag when the temperature of the granulated slag is 60 ° C. (magnification: 10 ×).

FIG. 5 is an enlarged photograph showing a particle structure of the granulated slag when the water temperature at the time of granulating the molten slag is 75 ° C. (magnification: 10 ×).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ash melting furnace 12 Torch 14 Ash melting furnace outlet 16 Reservoir tank 17 Nozzle 18 Granulated water injection pump 20 Temperature indication control device 21 Circulating water flow control valve 22 Cooling tower 24 Granulated water circulation pump 25 Slag conveyance device 26 Granulated slag conveyance Outlet 28 Temperature detector

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Ariake 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Akira Kaga 1-1-1, Higashikawasakicho, Chuo-ku, Kobe No. 3 Kawasaki Heavy Industries, Ltd.Kobe Head Office (72) Inventor Hideto Tomura 1-3-1, Higashi Kawasaki-cho, Chuo-ku, Kobe City Kawasaki Heavy Industries, Ltd.Kobe Head Office (72) Inventor Koji Tanaka Chuo-ku, Kobe City Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Toru Kikuchi 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo Head Office

Claims (1)

[Claims] 1. A method for granulating a molten slag by granulating the molten slag, wherein the granulated slag is granulated. A method for producing granulated granulated slag, wherein the water temperature of the storage water tank is in the range of 60 to 85 ° C.