JP2001235136A - Closing material for slag outlet for waste melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plugging material for a slag hole of a melting furnace melting wastes such as municipal refuse and industrial wastes. SOLUTION: Heavy metals are sometimes eluted from clay constituting a part of a mud material used for plugging the slag hole of the melting furnace which melts the wastes and discharges molten substance from the lower part intermittently. The elution of the heavy metals can be prevented by compounding artificial ceramic or an organic binder in place of the clay, by substituting a flocculant for a part or the whole of the clay or by adding the flocculant or a heavy metal fixing agent to the mud material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug for a slag outlet of a melting furnace for melting waste such as municipal waste and industrial waste.

[0002]

2. Description of the Related Art Conventionally, a so-called mud plug for a slag outlet of a melting furnace for melting waste such as municipal waste and industrial waste is a mixture of several types of aggregate, several types of clay, and several types of binders. The mud material for metal melting furnaces such as blast furnaces, converters, and electric furnaces, which are the main raw materials, is used as it is, or is used after being improved with a slight change in the composition. In the composition of the mud aggregate for the metal melting, clay, binder, etc.
Studies have been made on use under severe conditions such as corrosion resistance, workability, and high pressure operation.
No. 5 and JP-A-11-349385. Also, in a melting furnace for melting waste, although not as severe as the mud material for melting metal, the same blending or blending in consideration of corrosion resistance and workability is performed.

On the other hand, when examining the chemical safety, heavy metals may be eluted depending on the mud material. As a result of investigating the elution values of these mud materials for each compounding material, as shown in Table 1, it was found that the mud materials were caused by clay. In addition,
The dissolution test method was based on lead as a heavy metal in accordance with the Notification of the Environment Agency No. 46 of 1991. The mud material for melting metal does not mix into the product and does not affect the quality of the product and does not cause any problems.However, the mud material for the melting furnace that melts waste is excavated at the time of opening. There is a drawback that the slag is mixed into the melt and causes the heavy metal to elute from the waste slag obtained by cooling and solidifying the melt, which hinders the effective use of the waste slag.

[0004]

[Table 1]

[0005]

In order to effectively utilize the waste slag, heavy metals must not elute and constitute a part of the mud material for a waste melting furnace which is considered to be mixed into the waste slag. It is necessary to prevent leaching from clay.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have made intensive developments, and as a result, a melting furnace which melts waste and discharges the melt intermittently from below. In the mud material used for closing the slag port, heavy metals may be eluted from clay constituting a part of the mud material. Therefore, heavy metals are eluted by blending artificial ceramics or organic binders in place of clay, or replacing clay with a part or all of a flocculant, or adding a flocculant or heavy metal fixing agent to mud material. Can be prevented.

[0007] The gist of the invention is as follows: (1) A plug material for a discharging port used for closing a discharging port of a melting furnace for intermittently discharging waste from a lower portion by melting treatment of waste, A plug for a slag port for a waste melting processing furnace, wherein an artificial ceramic is blended in place of the clay constituting a part of the plug for a slag port. (2) A part of the plugging material for a tapping port used for plugging a tapping port of a melting furnace for melting a waste and intermittently discharging a molten material from a lower part of the melting port. A closing material for a slag outlet for a waste melting treatment furnace, wherein an organic binder is blended in place of the clay.

[0008] (3) A plugging material for a tapping port used for plugging a tapping port of a melting furnace for melting a waste and intermittently discharging a molten material from a lower portion, wherein one of the plugging material for a tapping port is used. A closing material for a tap hole for a waste melting treatment furnace, wherein the clay constituting the part is partially and entirely replaced with a coagulant. (4) A flocculant is added to the plugging material for a tapping port used for plugging a tapping port of a melting furnace that melts waste and discharges the melt intermittently from below. A plugging material for a slag port for a waste melting processing furnace. (5) A closing material for a slag port used for closing a slag port of a melting furnace for intermittently discharging a molten material from a lower portion by melting a waste, wherein a heavy metal fixing agent is attached to the slag port closing material. And a plug for a slag outlet for a waste melting furnace.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. Mud materials for waste melting furnaces such as municipal solid waste and industrial waste are composed of several types of aggregates and several types of clay. The characteristic means of the present invention for solving the above-mentioned problems includes:
An object of the present invention is to mix artificially manufactured ceramics containing no heavy metal in place of clay with a mud material for a waste melting furnace to prevent the elution of heavy metal from the mud. As the artificially manufactured ceramics, for example, ceramics synthesized by a gas phase reaction and powder adjusted, ceramics synthesized from a liquid and powder adjusted, and ceramics synthesized and powder adjusted by thermal decomposition of a solid phase can be used.

[0010] Instead of clay, an organic binder containing no heavy metal may be added to the mud material for the waste melting furnace to prevent elution of the heavy metal from the mud. As the organic binder, for example, polyvinyl alcohol, polyethylene glycol, polyvinyl methyl ether, sodium ligninsulfonate, dextrin, phenol resin, gum arabic, starch and the like can be used.

[0011] A part or all of the clay compounded in the mud material for the waste melting furnace is replaced with a flocculant or a flocculant is added without replacing the clay to prevent elution of heavy metals from the mud. You can also. According to the present invention, even when the mud material is immersed in water such as being put into a water tank together with the molten material, the flocculant aggregates harmful heavy metals and becomes harmless as stable particles. Does not elute. As the coagulant, for example, ferrous sulfate, ferric sulfate, polyaluminum chloride, magnesium carbonate, ferrous chloride, ferric chloride, aluminum sulfate, a commercially available coagulant, and the like can be used. The range of 0.005 to 5% is suitable when the weight of the mud material including the agent is used as a denominator.

The coagulant used in the mud material for the waste melting furnace is preferably used at pH 4 to pH 11, and an alkali source such as slaked lime, caustic soda, or magnesium hydroxide is used to adjust the coagulant to an appropriate range. Can also be added. Further, even if the mud material is immersed in water such as being put into a water tank together with the molten material, the heavy metal fixing agent fixes the harmful heavy metal and becomes harmless, and the heavy metal does not elute from the mud material. As the heavy metal fixing agent, for example, a chelating agent or the like can be used, and the addition amount is suitably in the range of 0.05 to 1% based on the weight of the mud material as a denominator.

[0013]

EXAMPLES (Example 1) An artificial ceramic containing no heavy metal was blended in place of the clay of the mud material for the waste melting furnace, and the dissolution test results are shown in Table 2. Comparative Example (No.
Clay 1 in Table 1 was used as the clay blended in 5). As shown in the invention examples (Nos. 1 to 4) in Table 2, the effect of preventing elution of heavy metals was confirmed by blending artificial ceramics instead of clay. In Table 2, alumina powder synthesized and prepared by a gas phase reaction was used as an artificial ceramic.

[0014]

[Table 2]

Example 2 An organic binder containing no heavy metal was blended in place of the clay of the mud material for the waste melting furnace, and the dissolution test results are shown in Table 3. Comparative Example (No. 1)
Clay 1 in Table 1 was used as the clay blended in 0). As shown in the invention examples (Nos. 6 to 9) in Table 3, the effect of preventing the elution of heavy metals was confirmed by blending an organic binder instead of clay. In Table 3, dextrin was used as the organic binder.

[0016]

[Table 3]

Example 3 A part or all of the clay of the mud material for the waste melting furnace was replaced with a coagulant or a clay coagulant was added, and the results of the dissolution test are shown in Table 4. Clay 1 in Table 1 was used as the clay blended in the comparative example (No. 14). As shown in the invention examples (Nos. 11 to 13) in Table 4,
The effect of preventing elution of heavy metals was confirmed. In this example, ferric sulfate was used as a coagulant. In this embodiment, the pH of the mud material containing 5% of the coagulant when immersed in water is 3.5.
Therefore, magnesium hydroxide was added as an alkali source so as to have a pH of 7.

[0018]

[Table 4]

Example 4 A heavy metal fixing agent was added to a mud material for a waste melting furnace, and the dissolution test results are shown in Table 4. Clay 1 in Table 1 was used as the clay blended in the comparative example (No. 17). As shown in the invention examples in Table 5 (Nos. 15 to 16), the effect of preventing the elution of heavy metals was confirmed. In this example, a chelating agent was used as a heavy metal fixing agent.

[0020]

[Table 5]

(Embodiment 5) FIG. 1 is a block diagram for using a mud material for a waste melting furnace according to the present invention. In FIG. 1, waste, coke and limestone as auxiliary materials are charged into the melting furnace 1 from the upper part of the melting furnace 1. Municipal waste was disposed of as waste. Table 6 shows the properties of municipal solid waste. Air and oxygen are supplied from a tuyere 2 provided at a lower portion of the waste melting furnace 1. Waste treatment volume is 560k
g / h, about 6% of the coke and limestone waste air is 520 nm ³ / h, oxygen 30 Nm ³ / h. The waste, coke, and the like charged into the waste melting furnace form a packed bed in the furnace, and a part of the coke and the waste is burned by air and oxygen blown from the tuyere 2. The combustion gas rises from the bottom of the waste melting furnace,
The waste is preheated, dried and pyrolyzed by the sensible heat of the combustion gas. Steam, pyrolysis gas and fine dust generated in the process of drying and pyrolysis of the waste are discharged from the gas discharge pipe 4.

[0022]

[Table 6]

On the other hand, the ash, non-combustion, coke, and lime of the waste are heated to a high temperature and descend to the furnace bottom.
The coke burns with the air and oxygen blown from the tuyere 2, and the ash and non-combustion are reduced from 1300 ° C to 1650 ° C.
The mud material is heated into a molten state, and the mud material is poured into the slag port by a slag port closing machine, and accumulates in the closed furnace bottom. The slag outlet is opened by a slag outlet closing device every about one hour, and the slag is discharged from the slag discharge port 3 to the outside of the furnace. The molten slag discharged from the slag discharge port 3 is charged into the granulation tank 6 and becomes fine sand-like particles.

In this embodiment, the slag opening is closed with the mud material having the composition shown in Examples 1 to 4, the slag is stored in the furnace bottom, and then the slag is opened and thrown into the water cooling tank 6, and the slag is charged into the water cooling tank 6. The slag formed into fine particles was sampled and subjected to a dissolution test to confirm that the slag was effective. In addition, there was no problem in the corrosion resistance, workability, and blocking property of the mud material. In addition, the dissolution test method of Examples 1 to 5 was carried out in accordance with the Environment Agency Notification No. 46 of 1991.

[0025]

[Table 7]

[0026]

As described above, according to the present invention, even if a mud material is used in the discharge port of a waste melting furnace, there is no heavy metal contamination in the melt, and the bone of the concrete secondary product of the melt can be obtained. It is effective in recycling resources such as timber and civil engineering materials.

[Brief description of the drawings]

FIG. 1 is a block diagram for using a mud material for a waste melting furnace of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste melting furnace 2 Tuyere 3 Slag discharge port 4 Gas discharge port 5 Slag port opening and closing machine 6 Water cooling tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/44 ZAB B09B 3/00 303K (72) Inventor Yasuo Ino 46-46 Nakahara Oaza, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture 59 N-Steel Co., Ltd. Engineering Business Unit F-term (reference) 3K061 AA24 AB03 AC01 BA05 DA12 NB03 NB27 3K065 AA24 AB03 AC01 BA09 BA10 4D004 AA46 BA02 CA29 CB02 CB43 CC11 CC15

Claims (5)

[Claims] 1. A plugging material for a slag port used for closing a slag port of a melting furnace for intermittently discharging a molten material from a lower portion by melting a waste material, wherein a part of the slag port closing material is used. A closing material for a slag outlet for a waste melting treatment furnace, characterized by mixing artificial ceramics in place of the clay constituting the above. 2. A closing material for a discharging port used for closing a discharging port of a melting furnace for intermittently discharging a molten material from a lower portion by melting treatment of waste, a part of the closing material for the discharging port. An organic binder is blended in place of the clay that constitutes the above. 3. A closing material for a discharging port used for closing a discharging port of a melting furnace for intermittently discharging a molten material from a lower portion by melting treatment of waste, a part of the closing material for the discharging port. And a part of or the entirety thereof is replaced with a coagulant. 4. A plugging material for a slag port used for closing a slag port of a melting furnace for intermittently discharging a molten material from a lower portion by subjecting a waste to melting treatment, wherein a flocculant is added to the slag port plugging material. A plugging material for a slag outlet for a waste melting treatment furnace, characterized by adding slag. 5. A closing material for a discharging port used for closing a discharging port of a melting furnace for melting a waste and intermittently discharging a molten material from a lower part, wherein a heavy metal is fixed to the closing material for the discharging port. A plugging material for a slag port for a waste melting furnace, characterized by adding an agent.