JPH11347514A - Manufacture of granular sulfer solidification molded material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a handling property in the case where a granular sulfur solidification molded material is used as an aggregate or the like for a building material by continuously feeding a melted sulfur kneaded mixture containing a treated material such as incineration ash or the like and sulfur to a vibration transfer means, the mixture is allowed to spring up on a vibration base, and transferred to be molded granularly by solidification while it is divided into sections. SOLUTION: A raw material mixture containing a material to be treated and sulfur is kneaded by heating by a kneader 11, and an obtained melted sulfur kneaded mixture is supplied to a vibration granulator 2 through a hopper 1. The vibration granulator 2 is placed on a trestle 10 via four springs 5, and the whole of the equipment is vibrated since a vibrator 4 in the vibration granulator 2 is vibrated. The melted sulfur kneaded mixture fed onto a vibration base 3 in the vibration granulator 2 receives vibration, and is granulated while it is moved in the direction of an outlet 6. Thereafter, the granulated sulfur solidification molded product is discharged from the outlet 6, and stored in a receiving bag 12. Further, in this case, cold wind is sent from a cooling machine 7, and the melted sulfur kneaded mixture in the vibration granulator 2 is cooled through a pipe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steelmaking slag, a steelmaking dust and other industrial wastes, or an organic chlorine compound such as polychlorinated biphenyls (PCB) and polychlorinated dibenzoparadioxins (PCDD) and other harmful substances. The present invention relates to a method for producing a reusable sulfur-solidified product by solidifying and sealing incineration ash, dust, fly ash, and the like containing sulfur. More specifically, the present invention relates to a method for producing a granular sulfur-solidified product having a desired particle size directly from a state having fluidity before solidification in the production of a sulfur-solidified product.

[0002]

2. Description of the Related Art From the viewpoint of effective use and reduction of other industrial waste such as steelmaking slag, steelmaking dust, and the like, which have been discarded as they are, or substances harmful to the human body such as PCB (polychlorinated biphenyls). From the viewpoint of detoxifying incinerated ash, dust and the like and preventing elution of harmful substances, such industrial waste and incinerated ash are kneaded with molten sulfur under predetermined conditions, then solidified and sealed, and heavy metals, There has been provided a method for producing a solidified sulfur product that does not elute harmful substances such as PCB (Japanese Patent Application Laid-Open No. 8-318244). In order to reuse this sulfur solidified product, it is preferable to provide it as a suitable molded article, but no suitable method that can be implemented industrially has been developed so far. As a possible method, a molten sulfur kneaded material obtained by kneading industrial waste or incinerated ash with sulfur,
There is a method in which a solidified product is obtained by pouring into a mold wax and solidifying it. However, this method has a disadvantage that the production efficiency is inferior. In addition, when the sulfur solidified material is to be used as a building material, it is necessary to crush the once solidified material with a crusher and then adjust the particle size using a sieve or the like from the viewpoint of convenience of transportation and handling. was there. So this method
Wasted energy was required because the molten sulfur kneaded material was once solidified and then pulverized again. Furthermore, in order to obtain an appropriate particle size, it must be classified by sieving after crushing,
It was not easy to obtain a sulfur solidified product having a desired range and size, and the obtained crushed products were often undesirably flat. FIG. 3 is an explanatory view of this conventional crushing. The raw material mixture is kneaded by a kneader 31 and supplied from a hopper 32 to a molding die 34 via a molding trolley 33. The molded product formed by the forming die 34 is crushed by a crusher 35 and sieved by a vibrating sifter 36. Then, the crushed product having a predetermined particle size or less is placed on the belt conveyor 38. On the other hand, the crushed product having a predetermined particle size or more is returned to the crusher 35 through the belt conveyor 37 and crushed again. The crushed product 39 thus obtained has irregularities having a large surface area, and also includes a powder having a very small particle size. By the way, as another method for producing the above-mentioned sulfur solidified product,
A method is conceivable in which the molten sulfur-kneaded material is passed through an electric sieve or the like in a kneaded state, and then poured into water to be solidified (water granulated) and molded. However, according to this method, although the step of crushing the solidified product once using a crusher is omitted, the particle size of the obtained sulfur-solidified product is not constant and needs to be further classified. There was also a concern that harmful substances could be eluted into water when injected into water. Therefore, it has been desired to develop a method for producing a sulfur-solidified molded product in which the molten sulfur-kneaded product is easily solidified and formed so as to have a desired particle size without undergoing a crushing or classifying step as in the above method. .

[0003]

Accordingly, the present invention relates to a method for producing a sulfur-solidified molded product obtained by kneading an object to be treated such as industrial waste or incinerated ash with molten sulfur and preventing elution of harmful substances. It is an object of the present invention to provide a production method capable of solidifying a molten sulfur kneaded product without performing an extra operation to obtain a sulfur-solidified molded product having a desired particle size.

[0004]

That is, the present invention provides:
(1) A fluid molten sulfur kneaded product obtained by heating and kneading an object to be treated such as industrial waste or incinerated ash and a raw material mixture containing sulfur is solidified and granulated to produce a granular sulfur solidified molded product. In this regard, the molten sulfur kneaded material is continuously supplied to a vibrating transfer means, and the molten sulfur kneaded material is splashed off by vibration on a vibrating table, and is moved while dividing and solidified and formed into granules. The method for producing a granular sulfur solidified molded product according to (1), wherein the method for producing the granular sulfur solidified molded product and (2) cooling the molten sulfur kneaded product supplied to the vibration transfer means with a cooling device. To provide.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is an explanatory view showing a manufacturing apparatus that can be used in the method of the present invention from the front, and FIG. 2 is an explanatory view showing the apparatus shown in FIG. 1 from a side. In FIG. 1, reference numeral 1 denotes a hopper. Reference numeral 11 denotes a kneading machine for molten metal and an object to be treated such as industrial waste and incinerated ash. The molten sulfur kneaded material prepared in the kneader 11 is passed through a hopper 1 to a vibrating granulator 2.
Supplied to The molten sulfur kneaded product used in the present invention is obtained by heating and kneading a raw material mixture containing an object to be treated such as industrial waste and incinerated ash and sulfur. The materials to be treated include steelmaking slag, steelmaking dust, and other industrial wastes, incinerated ash, medium dust, fly ash, and contaminated soil containing substances harmful to the human body such as PCBs (polychlorinated biphenyls). In addition, coal ash and shredder dust may be mixed in the object. Examples of the material to be treated are described in JP-B-62-51440 and 61-1.
No. 5759, No. 62-15724, Tokiko 2-496
No. 80 or the like can be used, but the material is not limited thereto, and any material may be used as long as it produces a solid after being kneaded with molten sulfur. However, from the viewpoint of preventing elution of harmful substances, the water content of the object to be treated is preferably 3% by weight or less, more preferably 1% by weight or less. Sulfur does not necessarily have to be of high purity,
Sulfur produced as a by-product from desulfurization processes such as coke production, steelmaking, and oil refining factories may be used, or natural elemental sulfur may be used. There is no particular limitation on the ratio of sulfur to the material to be treated,
What is necessary is just to be in the range which can fully solidify and block the to-be-processed object with sulfur. The temperature of the material to be kneaded is usually 9
About 5 to 150 ° C., preferably at most 160 ° C.
Degree, more preferably kept at 115 to 140 ° C. The kneader 11 may be selected with an emphasis on taking time for the molten sulfur to sufficiently penetrate into the object to be treated, and may be of any type such as a single-shaft, twin-shaft, batch type, or continuous type.

[0006] The vibration granulating device 2 serving as a vibration transfer means has a 4
It is placed on a gantry 10 via a book spring 5. When the vibrator 4 in the vibration granulator 2 vibrates, the whole vibration granulator 2 vibrates. The molten sulfur kneaded material supplied to the vibrating table 3 in the vibrating granulator 2 through the hopper 1 is vibrated and granulated while moving toward the outlet 6 of the vibrating granulator 2. Thereafter, the granulated sulfur-solidified product is discharged from the outlet 6 and delivered to the receiving bag 12. In this process, the cool air discharged from the cooler 7 is supplied to the vibrating granulator 2 through the pipe 8 to cool the molten sulfur kneaded material. Thereafter, it is returned to the cooling device 7 through the pipe 9. In the method for producing a sulfur-solidified molded product of the present invention, if the molten sulfur-kneaded product is cooled by blowing cold air, a larger amount of granular sulfur-solidified molded product can be produced, as in the embodiment shown in FIG. A cooling device can be optionally installed. The vibrator 4 in the vibrating granulator 2 has a structure in which an unbalanced weight (eccentric weight) is rotated by an electric motor to generate vibration, and the vibrator 4 vibrates. The vibration table 3 in the device 2 is vibrated.
The shaking table 3 may have any structure as long as it can granulate the molten sulfur kneaded product to a desired particle size. Here, a belt conveyor structure is used, and the vibration table itself is driven by a motor. The molten sulfur kneaded material supplied from the hopper 1 onto the shaking table moves in the direction of the outlet 6 on the shaking table along the belt conveyor. During this time, the vibrating table itself vibrates together with the vibrating granulator 2, so that the molten sulfur kneaded material is vibrated and granulated before moving to the outlet 6. The vibration given to the shaking table varies depending on the required average particle size of the sulfur-solidified product, but preferably, the amplitude in the vertical direction is 0.2 to 0.5 cm, and the frequency is 30 to 6 cm.
0 cycles / sec. The time during which the molten sulfur kneaded material is vibrated on the shaking table is preferably 1 to 3 minutes. If the vibration time is too short, granulation and solidification are insufficient, and a solidified sulfur product having a predetermined particle size cannot be produced. In addition, even if the vibration is applied for an excessively long time, the granulation and solidification have already been completed, and the electricity cost and the like are wasted. In FIG. 1, the vibrating table is installed horizontally, but may be inclined.
FIG. 4 is an explanatory view showing the outline of the manufacturing method of the present invention, in order to compare the conventional manufacturing method shown in FIG. 3 with the manufacturing method of the present invention. The raw material mixture containing the material to be treated and sulfur is kneaded by a kneader 41 to form a kneaded molten sulfur product, which is supplied from a hopper 42 to a vibrating granulator 43. The vibrating granulator 43 has a vibrator 44. The molten sulfur kneaded material is granulated and formed into a sulfur solidified molded product in the vibration granulator 43. Numeral 46 is a granular sulfur solidified molded product sent from the belt conveyor 45.

The reason why a granular sulfur-solidified product can be easily produced by the method of the present invention is considered as follows. Since the shaking table vibrates in the vertical direction, the molten sulfur kneaded material on the shaking table jumps from the shaking table and floats in the air. Then, the molten sulfur kneaded material tends to be spherical due to surface tension. Also, the molten sulfur kneaded material tends to roll on the shaking table. In this way, the molten sulfur kneaded material is gradually granulated and hardened before moving to the outlet 6 of the vibrating granulator 2. When the molten sulfur kneaded product used in the present invention is manufactured by a conventional method, that is, when the molten sulfur kneaded material is poured into a mold and solidified, the sulfur solidified product is broken by a crusher, and crushed into powder. However, it has already been confirmed that no harmful substances are eluted into water when a predetermined object is heated and kneaded at a predetermined temperature. However, according to the conventional manufacturing method in which the sulfur solidified material is broken and prepared by the mechanical cutting force of the crusher, the inside of the object to be processed that is not in contact with the molten sulfur is exposed to the surface by the mechanical cutting. There is fear. On the other hand, in the method of the present invention, no mechanical cutting force is applied by a crusher or the like. In the method of the present invention, since the granulation is performed using the surface tension of the molten sulfur kneaded product that tends to round, the surface of the produced sulfur solidified product is covered with sulfur. In addition, according to the conventional method described above, the resulting solidified sulfur product has a complicated surface shape and a large surface area, whereas the granular solidified sulfur product formed by the method of the present invention has a spherical clean shape. The molded product has a surface and a small surface area.

[0008]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples. Example 1 A molten sulfur kneaded product was prepared using the following processing object and sulfur. 1) Steelmaking slag: 500 g of what is called converter ash
Using. Grain size: Slowly cooled slag of 4.0 to 0.25 mm (I
D-C3) Water: 3% or less Bulk specific gravity: 2.04 g / cm ² T-Fe: 58.8% 2) Steelmaking dust: 400 g was used. Particle size: Magnetic separation powder of 1.0 to 0.25 mm (LD-
OB) Moisture: 3% or less Bulk specific gravity: 1.82 g / cm ² T-Fe: 59.8% 3) Sulfur is desulfurized sulfur from petroleum refining and has a purity of 99.5% or more. 400 g were used. Contains no moisture. The object and the sulfur were kneaded at 120 ± 130 ° C. for 20 minutes. The obtained molten sulfur kneaded material was converted to a molten sulfur kneaded material a.
And Next, the molten sulfur kneaded product a was granulated according to the following conditions to produce granular sulfur solidified molded products (samples A to C).

[0009]

[Table 1]

When the particle size of the obtained sulfur solidified molded product was measured, the average particle size of Samples A, B and C was 12 mm, respectively.
The particles were 15 mm and 18 mm, and were substantially spherical and relatively uniform particles. The surface of the particles was smooth with little irregularities and clean. In addition, the particles of the object to be treated were not exposed, and a good granular solidified sulfur product was obtained.

[0011]

According to the method for producing a granular sulfur solidified molded product of the present invention, a granular sulfur solidified molded product having a desired particle size can be produced directly from a fluidized molten sulfur kneaded product before solidification, and it is crushed and sieved. And other steps can be omitted. further,
In the sulfur-solidified molded product produced by the method for producing a granular sulfur-solidified molded product of the present invention, the object to be treated is not exposed on the surface of the granular material, and the harmful substance sealing effect is excellent. In addition, since the sulfur-solidified molded product is a smooth, substantially spherical particle having a uniform particle size on the surface, it is easy to handle when used as a raw material of a construction material, for example, an aggregate, and has excellent performance.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing apparatus of a granular sulfur solidified molded product suitable for carrying out a method of the present invention from the front.

FIG. 2 is an explanatory view showing an example of an apparatus for producing a granular sulfur-solidified product suitable for carrying out the method of the present invention from the side.

FIG. 3 is an explanatory view schematically showing a conventional manufacturing method.

FIG. 4 is an explanatory view schematically showing a manufacturing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 42 Hopper 2, 43 Vibration granulator 3 Vibration table 4, 44 Vibrator 5 Spring 6 Outlet 7 Cooler 8, 9 Pipe 10 Stand 11, 41 Kneader 46 Granular sulfur solidified molded product

Claims (2)

[Claims] 1. A fluidized sulfur kneaded product obtained by heating and kneading an object to be treated such as industrial waste or incinerated ash and a raw material mixture containing sulfur is solidified and granulated to obtain a granular sulfur solidified molded product. In manufacturing, the molten sulfur kneaded material is continuously supplied to a vibrating transfer means, and the molten sulfur kneaded material is vibrated by a vibrating table by vibrating, and is moved while dividing and solidified and formed into granules. A method for producing a granular sulfur solidified molded product. 2. The molten sulfur kneaded material supplied to the vibration transfer means is cooled by a cooling device.
A method for producing the granular sulfur-solidified molded product as described above.