JPH05203362A - Rotary kiln - Google Patents

Abstract

PURPOSE:To enable execution of a continuous melting work by forming a recess-form groove, the inner bottom surface of which has specified structure, in the end part on the discharge side of a melting chamber, in a rotary kiln wherein a scrap engine is heated and an aluminum part can be separated away from a metal not yet melted to take it out. CONSTITUTION:In a rotary kiln 2 having a rotary drum 20 the interior of which forms a melting chamber 21, a separating recovering part 22 is connected to the end part on the discharge side of the melting chamber 21. The separating recovering part 22 has an annular groove body 22b formed in a recess-form groove 22a fixed to the end part on the discharge side of the melting chamber 21, and a grating 22e for separation is fixed to an opening surface 22c of the groove 22a. The interior of the groove 22a is separated into a plurality of separating chambers 22g by means of a plurality of partition wall plates 23. An outflow port 22j is formed in each separating chamber 22g in a state to make contact with one partition wall plate 23b and a discharge port 24 for small article not yet melted is formed in a state to make contact with the other partition wall plate 23b. Further, a separating plate 25 is arranged in an inclined state in a manner to make contact with the one side on the groove bottom 22h side of the discharge port 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary kiln which heats a waste engine, which is mainly industrial waste, to melt and remove an aluminum part and the like.

[0002]

2. Description of the Related Art Conventionally, in this type of rotary kiln, the bottom surface of the melting chamber of the rotating drum is formed in a downward slope shape from the waste input side to the discharge side, and the downward slope end surface of the melting chamber is the end surface of the rotating drum as it is. Was formed to match. The molten metal melted in the melting chamber flows down to the end face of the melting chamber together with the unmelted metal.Therefore, there is a gap for the outflow of the molten metal between the end face of the melting chamber and the unmelted metal. There was an opening and closing door to store metal.

[0003]

However, in this conventional rotary kiln, as the melting work progresses, the outflow gap is blocked by small parts such as bolts and nuts, which are unmelted metal, to worsen the outflow of the molten metal. If this gap is enlarged, there is a problem that undissolved small parts pass through and enter the molten metal to deteriorate the quality. In addition, unmelted small parts are blocked in the outflow gap and damage the refractory of the melting chamber end face and the opening / closing door.When a certain amount of unmelted metal is accumulated, the melting work is stopped and the unmelted metal is taken out. There was a problem that it was necessary to carry out continuous work. Further, for this reason, there is a problem that the temperature inside the melting chamber is lowered and the efficiency is deteriorated.

The present invention has been made in order to solve the above-mentioned conventional problems, and its purpose is to separate molten metal from undissolved metal and take out molten metal of high quality. Another object of the present invention is to provide a rotary kiln capable of performing continuous work efficiently.

[0005]

As a means for achieving the above object, in the rotary kiln of the present invention, the inner bottom surface of the melting chamber provided in the rotating drum is formed in a downward slope shape from the raw material input side to the discharge side. In the formed rotary kiln,
A concave groove is provided on the inner bottom surface of the discharge side end of the melting chamber, and a flowing gap of molten metal and a sliding surface for discharging unmelted metal are formed in the concave groove over the entire circumference of the groove opening surface. Separating partition, a partition plate standing in the recessed groove at equal intervals to form a plurality of separation chambers over the entire circumference of the groove, and one end side is in contact with one side of the partition plate forming the separation chamber In this state, an outlet is provided at the bottom of the groove to let the molten metal flow out of the rotating drum, and an outlet for the undissolved small metal that is opened in each groove on the rotating drum discharge side groove wall of the concave groove and one end side A separation plate fixed along one side of the groove bottom side of the discharge port, the other end side inclined to the groove opening surface side, and a separation plate having a flowing gap of molten metal between the groove peripheral wall surface and the separation plate. ..

[0006]

In the rotary kiln of the present invention, a concave groove is provided around the inner bottom surface of the discharge side end of the melting chamber, and the concave groove is provided with a separating grid over the entire circumference of the groove opening surface. The molten metal obtained by heating the molten raw material flows down into the concave groove from the downward gap, and the unmelted metal slides on the sliding surface and is sent to the discharge side. Since the concave groove is provided with an outlet on the bottom of the groove, the molten metal flowing down into the groove is discharged to the outside of the rotary drum. Further, since the separation chamber is formed by the partition plate in the concave groove and each separation chamber is provided with the discharge port and the separation plate, the undissolved small parts smaller than the downflow gap of the separation grid are It falls on the separation plate through the flow gap. Since one end side of this separating plate is inclined toward the discharge port side, the small parts that have not been melted move to the groove wall side on the discharge side of the rotary drum after dropping. Among these undissolved small parts, those that have moved to the discharge port provided on the groove wall are discharged from the discharge port to the outside of the rotary drum as they are. Then, since the separation plate inclines as the rotary drum rotates, the undissolved small parts that have moved to the groove wall side slide down on the groove wall side and are discharged from the rotary drum to the outside.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. In addition, in the present embodiment, a case where an industrial waste treatment apparatus is combined with an industrial waste gas generation furnace will be described as an example. FIG. 1 is an explanatory view showing a main part of a rotary kiln of the present embodiment, FIG. 2 is an explanatory view showing an end surface of a rotary kiln on the discharge side, and FIG. 3 is a partially cutaway side view showing the whole rotary kiln of the same. FIG. 4 is a plan view showing the industrial waste processing apparatus of the above. Industrial waste treatment device A of this embodiment
Mainly comprises a waste gasification incinerator (gas generation furnace) 1, a rotary kiln 2, an unmelted metal extraction furnace 3 and a molten metal extraction furnace 4.

The waste gasification incinerator 1 is designed to generate pyrolysis gas from scrap cars and tires by heating industrial waste such as scrap cars and tires into a dry distillation state. As shown in FIG. 4, in the embodiment, two furnace bodies 10, 10 are provided. The furnace body 10 includes an industrial waste input port 11 and an input / output door opening / closing door 1, respectively.
2. The outlet 13, the door 14 for opening and closing the outlet, the blower 15 for primary combustion, the blower pipe 16 and the like are provided. It has an air supply port and an ignition burner that communicate with

Further, the two furnace bodies 10 and 10 are communicated with each other by a collecting duct 17 provided with a switching valve. A blowing duct 17a is connected to the collecting duct 17 and a secondary duct is connected to the blowing duct 17a. The pipe 18a of the combustion blower 18 is inserted, and the secondary combustion burner 19 is arranged therein to completely combust the pyrolysis gas generated in the furnace body 10, and the rotary kiln 2 installed next by the ejector effect. It is formed so as to blow into the inside.

The rotary kiln 2 heats the input waste engine with the combustion heat of the pyrolysis gas generated from the waste gasification incinerator 1, thereby melting the aluminum part and then separating and recovering it from the undissolved metal. The rotary drum 20, the dissolution chamber 21, and the separation / collection unit 22 are the main components.

The rotary drum 20 has a long melting chamber 21 therein, and is used for reversing the waste engine in the melting chamber at an appropriate speed and gradually feeding it toward the discharge side, as shown in FIG. As described above, the guide wheels 20b, 20b are fixed to the outer peripheral surface of the cylindrical steel plate 20a at two locations. Then, a pair of left and right receiving rollers 23a pivotally supported on the base 23,
The guide wheels 20b, 20b are rotatably supported by 23a. Although not shown, the base 23 is provided with a drive device for the rotary drum 20.

The melting chamber 21 is for heating and melting the waste engine, and is formed so that the inner diameter of the castable refractory 21a gradually increases from the start end side to the end side inside the rotary drum 20. By doing so, the inner bottom surface 21b is formed to have a downward slope shape. Then, the starting side of the melting chamber 21, which is the starting side 21 of the raw material,
In c, a chute 21d for disposing of the waste engine is provided,
A discharge side 21e, which is the same end side, is arranged so as to face the waste gasification incinerator 1, and the tip of the blowing duct 17a is formed so as to be inserted into this discharge side 21e. Although not shown, a plurality of stirring plates are provided on the inner bottom surface 21b of the melting chamber in a state in which the discharge side is inclined in the direction opposite to the rotation direction with respect to the axial direction of the rotary drum 20.

The separating and collecting section 22 has a molten metal (aluminum) w and an unmelted metal (iron parts, bolts and nuts) s.
And for recovering only the molten metal, as shown in FIGS. 1 and 2, the groove 22a is formed in a concave shape by a stainless material and the groove 22a is formed into a circular shape with the groove 22a being the inner surface side. The annular groove 22b formed in the above is fixed to the end of the discharge side 21e of the melting chamber. And this groove 22
In the opening surface 22c of a, the upper surface is flush with the inner bottom surface 21b of the melting chamber 21, and the molten metal flow gap 22d is formed.
A large number of separating grids 22e are fixed to both groove walls in a bridging state. The upper surface of the separating grid 22e serves as a sliding surface 22f for discharging unmelted metal.

A plurality of partition plates 23 are provided upright in the groove 22a, and a plurality of separation chambers 22g are formed in the annular groove 22b. In the separation chamber 22g at the lowermost position of the rotary drum 20, an outlet 22j is provided in contact with one of the partition plates 23a to let the molten metal flow out of the rotary drum at the groove bottom 22h. Further, a discharge port 24 for undissolved small parts is provided in the rotary drum discharge side groove wall 22k at a position appropriately in contact with the other partition plate 23b and above the groove bottom 22h,
Further, the separation plate 25 is fixed to the discharge side groove wall 22k at one end side in contact with one side of the discharge port 24 on the groove bottom 22h side. The separating plate 25 has a groove opening surface 2 on the other end side.
Incline so that it is closer to the 2c side, and further outlet 22j
The side is inclined so as to be closer to the groove bottom 22h side. The other separation chambers are also formed so as to have the above-mentioned arrangement when the lowermost position of the rotary drum 20 is reached.

The separating plate 25 has a discharge side groove wall 2
A downflow gap 25a for flowing down the molten metal is provided between the partition plate and the other groove wall except for the attachment portion to the 2k.

The unmelted metal extraction furnace 3 is for discharging unmelted metal without stopping the rotary kiln, and as shown in FIGS.
It is formed of a refractory so that the discharge side of 0 has a space portion 30 assuming an appropriate extraction size and accommodates the discharge side. This unmelted metal removal furnace 3 has a chute 3 on its side.
It is formed so as to be thrown into the water pool 32 communicating with each other.

The molten metal extraction furnace 4 is for accumulating the molten metal w flowing out from the outlet 22j of the separation and recovery section, is provided below the rotary drum 20, and is completely inside the melting chamber 21. It is formed so that the waste gas after combustion is guided to the chimney 5 via the molten metal extraction furnace 4.

Next, the operation of the embodiment will be described. First, after throwing a scrap car or the like into one of the furnace bodies 10,
Pyrolysis gas is generated by heating to about 600 ° C. to dry-distill rubber, plastic, and the like. Also,
The secondary combustion blower 18 is operated to introduce the pyrolysis gas from the collecting duct 17 and blow it into the melting chamber 21 of the rotary kiln 2 by the blowing duct 17a. This pyrolysis gas is burned by the secondary combustion burner to heat the inside of the melting chamber 21 to a high temperature. Next, the waste engine charged from the charging chute 21d of the rotary kiln 2 rotates while being heated in the melting chamber 21 by the rotation of the rotary drum, and moves toward the discharge side 21e. In the waste engine heated at a high temperature, the molten metal portion is melted and flows down to the discharge side, and after flowing down from the downflow gap 22d of the separating grid into the groove 22a, the outflow port 22j is passed through the downflow gap 25a of the separation plate 25. To the outside of the rotary drum, and is collected in the molten metal extraction furnace 4. Of the unmelted small parts that have flowed down together with the molten metal, those that have fallen from the flow-down gap 22d of the separation grid are received by the separation plate 25 and are provided in the corners formed by both the discharge-side groove wall 22k side and the partition plate. Retained. Then, as the rotary drum 20 rotates, the separation plate 25 is inclined toward the discharge port 24 side, and the undissolved small parts roll down along the discharge side groove wall 22k and are discharged from the discharge port 24. The molten metal falling on the separation plate due to the rushing of the flow-down speed, the discharge side groove wall 22 follows the inclination of the separation plate 25.
It flows down to the outflow port 22j side along k, and flows down to the outflow port 22j via the downflow gap 25a. In addition, the large unmelted metal slides on the discharging sliding surface 22f of the separation grid and is discharged into the unmelted metal extracting furnace 3, and the chute 3
1 to the external water pool 32. Then, while the melting work is performed one after another, when the amount of pyrolysis gas generated by one of the furnace bodies 10 is reduced, the switching valve of the collecting duct 17 is switched to supply the pyrolysis gas by the other furnace body 10, Allow continuous melting work.

As described above, according to this embodiment, only the dissolved metal can be separated from the undissolved metal and recovered from the waste engine. Almost all undissolved small parts can be separated and removed, so that a homogeneous ingot can be formed. Unmelted metal is discharged to the outside without being stored in the melting chamber, so that the work can be continuously performed without stopping the furnace, which is very efficient. Further, since it is not necessary to provide a discharge side wall surface which is worn by the unmelted metal in the melting chamber, it is very economical and the structure is simple. Further, by alternately using the two furnace bodies, the pyrolysis gas can be continuously generated, and the melting work can be efficiently performed.

The embodiment of the present invention has been described above.
The specific configuration of the present invention is not limited to this embodiment, and the present invention includes a design change and the like within a range not departing from the gist of the invention. For example, in the embodiment, the fuel to be burned in the rotary kiln is the pyrolysis gas generated in the waste gasification incinerator, but is not limited to this.
The fuel can be set arbitrarily.

Further, the shape of the melting chamber of the rotary kiln, the shape of the charging side, the shape of the discharging side, etc. can be arbitrarily set.

[0022]

As described above, according to the present invention, because of the above-mentioned constitution, only the dissolved metal can be separated from the undissolved metal and recovered from the solid raw material containing two or more kinds of metals. it can. Almost all undissolved small parts can be separated and removed, so that a homogeneous ingot can be formed. Unmelted metal can be discharged to the outside without being stored in the melting chamber, so that it is possible to perform work continuously without stopping the furnace, which is very efficient. Further, since it is not necessary to provide a discharge side wall surface for accumulating the unmelted metal in the melting chamber, it is very economical and the structure is simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main part of a rotary kiln according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an end face on the discharge side of the rotary kiln of the above.

FIG. 3 is a partially cutaway side view showing the entire rotary kiln as above.

FIG. 4 is a plan view showing the industrial waste treatment apparatus of the above.

[Explanation of symbols]

 2 rotary kiln 20 rotary drum 21 melting chamber 21b inner bottom surface 21c raw material input side 21e discharge side 22 separation / collection section 22a groove (concave groove) 22c groove opening surface 22d downflow gap 22e separation grid 22f discharge sliding surface 22g Separation chamber 22h Groove bottom 22j Outlet 22k Rotating drum discharge side groove wall 23 Partition plate 23a One partition plate 23b Other partition plate 24 Undissolved metal discharge port 25 Separation plate 25a Downflow gap

Claims (1)

[Claims] 1. A rotary kiln in which an inner bottom surface of a melting chamber provided on a rotary drum is formed in a downward slope from a raw material input side toward a raw material discharge side, and a concave groove is formed on an inner bottom surface of a discharge side end portion of the melting chamber. In the concave groove, a separating grid for forming a flowing gap of molten metal and a sliding surface for discharging unmelted metal over the entire circumference of the groove opening surface, and the concave groove at equal intervals. A partition plate that stands upright and forms a plurality of separation chambers around the entire circumference of the groove, and a melt drum is opened at the groove bottom with one end side in contact with one side of the partition plate that forms the separation chamber, and the molten metal is rotated. An outlet for flowing out, an outlet for unmelted small metals opened in each separation chamber in the groove wall on the rotating drum discharge side of the concave groove, and one end fixed along one side of the groove bottom side of the outlet. Separation plate in which the other end side is inclined toward the groove opening surface side and a flowing-down gap of molten metal is provided between the groove peripheral wall surface , Rotary kiln, characterized in that it comprises a.