JP2958605B2 - Melt treatment method for fibrous waste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for melting and treating fibrous waste.

[0002]

2. Description of the Related Art
Fiber materials such as asbestos, rock wool, glass wool, etc. used as inner wall materials and refractories of buildings are placed in plastic bags, etc. In addition, they are solidified with a solidifying material such as concrete and then disposed of in landfills.Furthermore, after disposal, they must be managed so that they do not flow out to the outside for a long period of time. is there. In particular, asbestos, rock wool, glass wool, and the like have small apparent specific gravities, so their volumes increase upon disposal, and it is difficult to secure landfill sites, and it is required to reduce the volume.

As another method of disposing of fibrous waste, a method of adding a melting accelerator or the like to fibrous waste and performing a melting treatment has been proposed. There are drawbacks.

According to the present invention, fibrous waste obtained by disintegrating fibrous waste into an appropriate particle size is supplied to a melting furnace, and is melted into slag, solidified, reduced in volume, and made harmless. It is intended to provide a method for melting a material.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

A fibrous waste material 11 such as asbestos, rock wool, glass wool or the like is put into a melting furnace 1 and
In this method, the waste 11 is put in such a manner that the thickness of the portion near the electrode 7 is increased and the thickness of the layer is reduced as the distance from the electrode 7 is increased. When the wastes 11 sequentially injected by the resistance heat from the molten slag 2 generated by the melting of
In both cases, when the waste 11 is melted, the pressing means 9 for breaking the bridge 4 formed by the waste 11 between the molten slag 2 and the electrode 7 and burying the bridge 4 in the molten slag 2 < The present invention relates to a method for melting and treating fibrous waste, characterized in that the crosslink 4 is destroyed .

[0007]

In general, in the case of the (electric) melting process, the electrode 7
Since the lower surface 7a has the highest temperature, the gas is generated most at the lower surface 7a. Therefore, the gas is often discharged upward from near the electrode 7 without passing uniformly through the deposited layer of the waste 11 (without passing through the deposited layer of the waste 11, 7 may be discharged upward along the peripheral surface.)

When the fibrous waste material 11 is poured onto the molten slag 2, the layer thickness around the electrode 7 is increased and the layer thickness is reduced as the distance from the electrode 7 is increased. The resistance is increased, and the amount of gas exhausted in the vicinity of the electrode 7 is reduced, and the gas is uniformly exhausted from a place away from the electrode 7 through the deposited layer of the waste 11. Therefore, oxidative consumption of the electrode 7 caused by contact with the gas is prevented.

[0009] Further, as described above, the gas must be a waste 11
Therefore, dust in the gas is collected and purified by the sedimentary layer, and the concentration of dust in the gas decreases. The collected dust is re-melted.
Also in this respect, the purification of the gas is performed efficiently.

In particular, asbestos has a high melting point (15
(50 ° C. or higher), so that the bridge 4 is easily formed between the peripheral surface of the electrode 7 and the liquid surface of the molten slag 2. Until now, this bridge 4
For this reason, the melting of the waste 11 was often hindered. However, the pressing means 9 applied pressure to the bridge 4 to break the bridge 4, so that the melting of the waste 11 was efficient. It is done on a regular basis.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of the present invention, and FIG. 2 is a cross-sectional view showing a cross-linking phenomenon of a fibrous waste 11 around an electrode 7.

The melting furnace 1 is formed of a refractory material.
The melting furnace 1 is provided with a furnace lid 5 formed of a refractory material on an upper portion, and generated gas in the furnace is accumulated in a furnace space 6.
After passing through the exhaust gas duct 12, the gas is purified by a suitable known gas processing equipment (not shown) and released to the atmosphere as a purified gas.

An electrode 7 is inserted through the furnace lid 5.

Further, a charging pipe 8 for a fibrous waste 11 to be melted near the electrode 7 is provided through the furnace lid 5.

The input pipe 8 is provided with a pressing rod 9 'as a pressing means 9 protruding from the input pipe 8, and a conveying means 14 is connected to the input pipe 8 so as to be connected thereto. Is provided continuously from a hopper 13 in which a crushing means 15 is provided, and a supply means for supplying the fibrous waste 11 into the hopper 13.
10 are connected in series.

The crushing means 15 generates fibrous waste 11
The size of the crushing of pulverized water depends on the size of the melting furnace 1, but is preferably 100 mm or less, and more preferably 30 mm or less to prevent blockage of the charging pipe 8.

Reference numerals 3 and 16 denote tap holes, and the molten slag 2 is discharged from the tap port 3 as appropriate, cooled, solidified, and effectively used. Further, the metals contained in the waste 11 accumulate on the hearth as molten metal, so that the molten metal is discharged from the tap hole 16 as appropriate, collected after cooling and solidification.

The fibrous waste 11 is charged into the melting furnace 1 from the charging pipe 8 through the supply means 10, the hopper 13, and the transfer means 14, and is made into the molten slag 2. When inputting this waste 11,
Since the charging tube 8 is provided close to the electrode 7, the thickness of the waste 11 becomes thicker in a portion near the electrode 7 and becomes thinner as the distance from the electrode 7 increases. Therefore, the gas flow resistance in the thick portion increases, and the gas generated from the liquid surface of the molten slag 2 decreases around the electrode 7 and is discharged from a portion remote from the electrode 7.

Generally, in the case of an electric melting furnace, since the lower surface 7a of the electricity 7 is at the highest temperature, the gas is supplied to the lower surface 7a of the electrode 7.
Occurs most often in Therefore, when the waste 11 has an average layer thickness, most of the gas is discharged from the vicinity of the electrode 7 (the periphery of the electricity 7 and the waste 11) so as to pass through the gap. It is also discharged. ). The fact that the gas is discharged from the vicinity of the electrode 7 in this way means that
The gas comes into contact with the electrode 7, and a problem arises in that the electrode 7 is easily oxidized and consumed by the gas.

In this respect, in this embodiment, since the gas flow resistance is increased by increasing the thickness of the waste 11 around the electrode 7, most of the gas is separated from the electrode 7 having a small gas flow resistance. Since the gas is discharged from a place (a part close to the furnace wall), the gas of the electrode 7 is hardly oxidized and consumed.

Further, since the gas is always ejected after passing through the sedimentary layer of the waste 11, the dust in the gas is collected and purified by the fiber of the waste 11, so that the dust load of the gas is reduced. It will be small. For this reason, the known gas purifying equipment (not shown) connected to the exhaust gas dust 12 requires a small dust load, which is economical in this respect.

The collected dust is re-melted. In this regard, the purification of the gas is performed very efficiently.

Since the melting point of asbestos is as high as 1550 ° C. or higher and the apparent specific gravity is small, the crosslinks 4 are easily formed on the liquid surface of the electrode 7 and the molten slag 2 as shown in FIG.
When the bridge 4 is formed, the embedding of the waste 11 in the molten slag 2 is hindered in the portion where the bridge 4 exists. Furthermore,
The pockets 17 generated by the formation of the bridges 4
Means that the waste 11 around the electrode 7 is gone,
The gas is introduced into the pocket 17, and the situation of oxidative consumption of the electrode 7 as described above tends to occur.

In this respect, in this embodiment, the pressing section 9 ′ is provided in the charging section 8 and the surface of the waste 11 is appropriately pressed by the pressing section 9 ′, so that the bridge 4 is destroyed. Such a problem does not occur.

[0026]

Since the present invention is constructed as described above, the following effects are exhibited.

1. By increasing the layer thickness of the waste around the electrode, the ventilation resistance in this part increases, and gas will be ejected from a place away from the electrode with low ventilation resistance,
The intensive exhaust around the electrode is reduced, and the oxidative consumption of the electrode is reduced as much as possible.

2. As described above, the concentrated emission of gas around the electrode is small, and the gas is always discharged through the sedimentary layer of waste, so that the discharge speed is slow, and therefore, the dust in the gas is supplemented by the waste. The dust load in the collected gas is reduced, thereby reducing the burden on the gas purification equipment.

Further, the collected dust is re-melted together with the waste, so that the volume of the waste is reduced and the detoxification of the dust is promoted.

3. Since the bridging which is likely to be formed around the electrode is destroyed by the pressing means, the burial of the waste in the molten slag is smooth, and therefore, electric power is used effectively, and thus, in this respect, the waste is also efficiently used. Processing can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of the present embodiment.

FIG. 2 is a cross-sectional view of a main part of the present embodiment for explaining a crosslinking phenomenon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace 2 Molten slag 4 Crosslinking 7 Electrode 9 Pressing means 11 Waste

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23G 7/00 B09B 3/00

Claims (1)

(57) [Claims] 1. A method in which a fibrous waste material 11 such as asbestos, rock wool, glass wool or the like is charged into a melting furnace 1 to melt the waste material 11, and the waste material 11 is placed in a portion close to the electrode 7 Is supplied in such a manner that the layer thickness is increased and the layer thickness becomes thinner as the distance from the electrode 7 increases, and the electrode 7 is energized to be sequentially supplied by resistance heat from the molten slag 2 generated by melting the waste 11. Melt waste 11
In addition, the molten slag 2 and the electrode 7
The pressurizing means 9 breaks the bridge 4 formed by the waste material 11 and embeds the bridge 4 in the molten slag 2 .
A method of melting and treating fibrous waste, characterized in that the crosslinking 4 is destroyed .