JPS62112737A - Melting furnace for metal - Google Patents

Abstract

PURPOSE:To continuously fractionate and recover >=1 kinds of low melting metals with good thermal efficiency in an inclined furnace which heats waste and fractionates the high and low melting metals by covering the waste which is successively lowered on the hearth with ascending flame and combustion gaseous flow. CONSTITUTION:The upper hearth 2 of an inclined furnace body 1 has the surface condition and inclination at which the waste 4 does not slide down or fall only by the own weight or the own weight and the inertia of movement but is easily moved by the force toward the lower side along the hearth. Articles 7 are fed into the furnace by a pusher 7 from a feed base 6 in the direction of the hearth 2 extending toward the outside of the hearth 2; at the same time, the articles 4 on the hearth 2 are successively moved downward. On the other hand, the flame and combustion gas of a main burner 16 rise while heating the articles 4 and the furnace inside and enter a flue 18 from an inlet 17. The low melting metal in the articles 4 melt and the molten metal thereof accumulates in a molten metal reservoir 11. The molten metal is taken out from an outlet 13 according to need. The articles 4-Y, with which the elution of the low melting metal is completed, glide downward or fall on the slope of the lower hearth 3 from the bottom end of the hearth 4 and are discharged as the residues of the high melting metal from the bottom end of the furnace.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a metal with a high melting point (including alloys, hereinafter the same) and one or more types of metals with a low melting point (including alloys, hereinafter the same). Waste such as equipment parts and materials whose main constituent materials are (same as above) (including industrial waste).

same as below. ) is heat-treated and separated into molten metal with a low melting point and debris with a high melting point metal.

In recent years, reducing the weight of automobile parts, electrical parts, etc. is a major issue, so resins such as industrial plastics and aluminum or aluminum alloys have been used in large quantities. In addition to aluminum or aluminum alloy for weight reduction, large amounts of copper are used as conductive wires in electrical products, especially motors. Therefore,
The need to recover expensive low-melting point metals from rejected waste is increasing, and at the same time, (a) furnaces with good thermal efficiency and high operating efficiency, and (b) possibility of separate recovery of two or more types of low-melting point metals. The appearance of a new furnace is eagerly awaited.

[Conventional technology]

Despite the long-awaited expectations of the industry as described above, there is still no research regarding a method and apparatus for heat-treating waste mainly consisting of metal such as scrapped engines and separating it into molten aluminum or aluminum alloy with a low melting point and steel debris. The invention was published by the Japanese Patent Publication No. 56-5.
No. 0184, No. 57-4694, Publication No. 57-695
No. 0, No. 5T-25114, Utility Model Application No. 57-10429
As proposed by No. 6, etc., all of them are batch-type, which not only requires a long time for processing, but also has poor thermal efficiency.

The invention disclosed in Japanese Patent Publication No. 57-4694 is an aluminum recovery and melting furnace that melts and extracts only aluminum from machine parts and automobile parts that have been recovered from scrap.The bottom of the furnace is sloped to allow the molten aluminum to flow down. Although,
This is a so-called batch furnace in which one or several objects to be processed at one time are changed in each heat treatment, and the objects to be processed are side-chained from room temperature to the melting temperature of aluminum for each batch. Moreover, since reflected heat is mainly used, not only is the thermal efficiency not good, but the processing time per object to be processed requires a long time.

[Problem that the invention seeks to solve]

The present invention seeks to overcome these drawbacks of the prior art.

That is, since conventionally known metal separation melting and recovery furnaces are batch-type, they have poor thermal efficiency and require a long processing time per object to be processed. It was almost impossible to fractionate this. The present invention aims to solve these problems all at once.

(Means for Solving the Problems) The present invention provides a ψ inclined furnace having two or more hearths. The object to be processed is given a position and slope where it slides or falls down to the lower end of the hearth due to its own weight or its own weight and inertia of movement. (2) It does not slide or fall due to the inertia alone, but it provides a surface condition and slope that allows it to move easily due to downward force along the hearth. A molten metal socket is provided to receive the low melting point metal flowing down on the floor, and a sump is provided from which the molten metal can be collected and discharged as necessary. (c) The upper and lower ends of the tilting furnace are Forming an inlet and an outlet for the objects to be processed, each having an appropriate door or doors, (d) At around 1, the upper end of the inclined furnace has a large platform for feeding the objects to be processed;
The objects to be processed on the table are fed into the furnace, and the objects to be processed on the L hearth are sequentially moved downward, and the object to be processed at the lowest part is moved onto the lower hearth, and the object to be processed is slid or dropped on the hearth. (e) covering the object to be processed on the upper hearth with a flame stream and/or combustion gas directed from the lower part of the inclined furnace to the upper part;
A burner and an exhaust gas duct are provided at a position suitable for maintaining the temperature of the molten metal, and if necessary, a complete combustion chamber is provided to completely burn the gas, soot, etc. discharged from the duct. A metal melting furnace that separates and recovers a low melting point metal from an object to be processed that is substantially composed of a seed or two or more types of low melting point metal and a high melting point metal.

In the present invention, a metal with a low melting point refers to a metal with a melting point of 1100°C.
The following metals: tin, lead, zinc, magnesium, aluminum, barium, strontium, germanium,
High-melting point metals include silver, gold, copper, etc., and alloys based on these metals, and metals with high melting points include metals with a melting point of 1400°C or higher, such as silicon, nickel, cobalt, iron, titanium, platinum, zirconium, It means chromium, indium, niobium, tantalum, Kungesten, etc., and alloys based on these, with a melting point of 1400°C or higher.

In addition, in the present invention, "a surface condition that easily moves due to downward force along the hearth" or "formed so that it moves easily" means that it is formed by ordinary cold or hot rolling. It means a surface condition that is almost the same as that of a manufactured iron plate or steel plate, or a surface condition in which appropriate grooves are bored in the surface as necessary in a direction that does not hinder the movement of the object to be processed. In the present invention, a tilted furnace is a cylindrical furnace installed at a constant angle of inclination with respect to a horizontal plane,
The heating method is mainly heating by combustion heat of oil or gas used as fuel.

The certain angle of inclination of the inclined furnace is to allow the low melting point metal to be melted and separated to flow down in a certain direction in order to collect it in the pool, but at the same time, it is possible to move the object to be processed into the furnace with less work. To provide a means for extremely easily carrying out operations such as pumping with (energy), moving or stopping within the furnace, and releasing it outside the furnace after completion of processing (melting and separation of low melting point metals). It is something.

The angle of inclination required for each furnace bottom varies depending on the shape, weight, center of gravity, surface roughness, etc. of the object to be treated, and the roughness of the furnace bottom. For the body, there is an optimum constant inclination angle (especially for the upper hearth).

Therefore, in order to process various objects with different specifications or specifications under optimal conditions, it is necessary to have a tilting furnace with a structure that can change the tilt. Although it is possible to create a structure that changes the angle (particularly for the part corresponding to the upper hearth), actually changing the slope of the furnace requires work in the furnace repair process that involves attaching and removing furnace materials. However, it is not so easy to make the furnace general-purpose by changing the slope.

If it is acceptable to sacrifice the labor and energy required to move the object on the upper hearth, the inclination of the upper hearth can be set below a certain angle (for example, IOo) to move the object to be processed. It can be generalized depending on the type.

In addition, in the lower hearth, a certain angle (for example, 400
) By doing the above, the purpose of making it common use is almost achieved.

Considering the efficiency and operation, the furnace length of the inclined furnace of the present invention should be a pre-fixing zone, a heating zone and a soaking melting zone for each of one or more low melting point metals contained in the object to be treated. It needs to be long enough to form a discharge zone that discharges the debris after the low melting point metal has been leached out of the furnace.

In the uninvented furnace, the object to be processed is substantially composed of a metal with a high melting point and a metal with a low melting point, and may have a resin as a constituent component, or may be coated with an oil or fat. Its form and its position in the furnace are not particularly limited, as long as the form and position allow the melted low melting point metal to completely flow out.

As the main burner, an oil-fired burner with a large heat generating area is suitable, and its installation location needs to be the most suitable for heating the object to be treated, and also allows for heat retention of the molten metal. , the space below the soaking melting zone or the space above the lower hearth.

Heat retention of the molten metal kept in the molten metal pool can be achieved by appropriately guiding the combustion gas of the main burner (properly providing an opening to the flue), but an auxiliary burner for heat retention can be used to There is no hindrance to providing it at an appropriate position within the reservoir. A gas burner is more suitable as an auxiliary burner than an oil-burning type.

Further, as the oil, pyrolysis oil from waste tires, which is a common combustion oil, is preferably used, and as the fuel gas, pyrolysis gas from waste tires is extremely preferably used.

The doors or doors installed at the upper end of the northern hearth and the lower end of the lower hearth for receiving or discharging the objects to be processed may be any suitable type, such as a sliding door, a hinged door, or an opening/closing door. It is possible to attach automation devices such as an interlocking device for the upper and lower doors, a staggered opening/closing device for the upper and lower doors, and an interlocking device for the extrusion device with a timer.

As an extrusion device, an ordinary hydraulic pusher is used as appropriate, but it is common practice for uninvented furnaces to design, manufacture, and install with sufficient allowances for extrusion pressure, strength, etc. It is important to improve sexual performance. As a modification of the extrusion device, a belt type, bucket type, or grasping type conhair type with high frictional resistance can be considered.

Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

[Example 1] In FIG. 1, 1 is a tilted furnace main body, which has an outer wall, a framework (not shown), etc. that maintains the outer shape of the furnace,
The interior ceiling 1'' and side walls are covered with refractory bricks. 2 is the upper hearth, and 3 is the lower hearth. Smooth steel plates are preferably used as the floor plates for both, but the side walls of the hearth The part near the hearth is rounded or raised upward so that the object 4 to be processed moves downward along the hearth in the center of the hearth without colliding with or damaging the side wall. Preferably, a steel plate lining is attached to all or part of the side wall (at a predetermined height or width).

The back side of the hearth is covered with refractory insulation. The inclination of the hearth is such that in the upper hearth 2, all of the objects 4 to be processed do not slide or fall due to their own weight or only their own weight and inertia of movement, but are moved smoothly by the downward force along the hearth. shall be. That is, in the direction in which the upper hearth extends outside the furnace, an object feeding table 6 is provided (in some cases, integrally with the hearth), on which the object 4-1 is waiting to be fed. One container is prepared in advance at the station. The object to be processed is fed into the furnace by opening the door or sliding door 5 at the upper end of the hearth and pushing forward the pushing plate 8 of the butcher 7. However, the feeding pressure is sequentially transmitted downward and moves the row of objects to be processed downward, and the object to be processed 4-Y, which has completed elution of the low melting point metal at the lowest position, is transferred from the lower end of the upper hearth. Slide down and lower hearth 3
reach the top and fall or slide over the lower hearth. At this time, when the inclination of the upper hearth is appropriate, the rows of objects to be processed that are lined up from the top downward along the hearth are moved smoothly by a relatively small pusher force.

For example, in the case of a scrapped automobile engine, the angle of the steel plate when it starts to fall or slide down due to its own weight on a smooth steel plate is approximately 35° with respect to the horizontal plane. The inclination is usually less than 30° to 35° with respect to the horizontal plane, and the most preferable inclination angle is often about 32″.The objects to be processed are arranged on the upper hearth which has been adjusted to the most preferable inclination angle. let me,
When pressed lightly with the pusher, the row of objects to be processed smoothly moves downward, and only the lowest object to be processed slides down or falls. stop at almost the same time. The lower hearth 3 allows the iron debris that has slipped or fallen from the lower end of the upper hearth 2 (low melting point metal has been almost completely eluted) to slide or fall down to the door or sliding door 9 at the lower end of the furnace. It plays the role of discharging to the outside by opening and closing the sliding door, and the angle is 35" or more in the case of a waste engine, preferably about 45° to 60".

The steel plate for the upper hearth may normally be made of mild steel, but foundry steel with a relatively high carbon content is preferably used.

Further, the surface of the steel plate is preferably smooth, and guide rails, grooves for guiding molten metal, etc. are not necessarily preferable because they may obstruct smooth movement of the object to be processed. At the lower part of the upper hearth, there is a sump 11 which receives the low melting point metal 10 that flows down on the upper hearth and drips or flows down from the lower end of the tundish, and can be equipped with an auxiliary burner 12 for heat retention if necessary. Further, a molten metal outlet 13 is provided at the bottom of the sump 11.

Although it is possible to provide an overflow port (not shown) near the hot water level, it is difficult to operate because of the difficulty in keeping warm.

A down arch 14 and a down arm 15 can be provided in the upper part of the tilting furnace to guide the flame and prevent outside air from entering.

The main burner 16 is located in the upper space of the lower hearth and is usually
It is operated with only the main burner. 1200℃～1300℃
The flame of the burner, which is hotter than that, rises while mainly heating the object to be treated and the inside of the inclined furnace, and enters the flue 18 from the flue opening 17 as a hot air flow of 600° C. or more.

Depending on the conditions in which the object to be treated is heat-treated, the inside of the tilting furnace can be called a soaking zone, a heating zone, and a preheating zone in order from the bottom. The preheating zone has the effect of lowering the temperature as much as possible by effectively utilizing the amount of heat in the hot air flow that escapes to the flue by receiving heat from the object to be treated at room temperature that is sent into the furnace. Next, the preheated object to be processed is successively heated while moving downward through the heating zone until it reaches the melting point of the low melting point metal or higher.

The melting of the low melting point metal is continued until its elution is completely completed in the next soaking melting zone.

Even when the auxiliary burner is not used, the heat retention of the molten metal can be ensured by guiding a portion of the flame from the main burner 16 through the upper space of the sump 11 to the flue 18.

There is a damper 19 in the flue, and the amount of exhaust gas can be adjusted as well as the flame of the burner and the amount of supplied air. A portion of the flue 18 can also be operated to form a combustion zone that completely burns incompletely combusted gases such as oil and plastics generated in the preheating zone. The waste gas from the flue is discharged into the atmosphere through a gas scrubbing tower or straight out of the chimney.

On the other hand, the remains of the iron ingot released from the lower end of the furnace are transported to a deposition site (not shown) by appropriate transportation means. 1. It is deposited.

The slope of the upper hearth of the metal melting furnace shown in Figure 1 is 30~3
The inclination of the lower hearth is about 50 to 52 degrees, but this angle is a suitable angle to achieve the purpose of the present invention when the object to be treated is a V7220 kg engine. The upper hearth varies from about 25" to about 356" depending on its shape and external friction conditions (of course, it varies from about 25" to about 356").
0" or 156" or less can be used by increasing the power of the pusher, but this is not preferable.) In this case, while maintaining the furnace temperature constant for each zone, It is possible to continuously feed and discharge objects into the furnace, normally every 2 to 3 minutes, and at the most efficient operation, it is possible to process one object every 1.7 minutes. The number of objects to be processed is 20.
The average residence time in the furnace was 34 minutes. Furthermore, the number of objects to be treated after 8 hours of continuous operation was approximately 5
The amount of molten aluminum obtained by separation was approximately 5 tons.

This efficiency is demonstrated by the fact that in the case of a 1,000-meter model like the one manufactured by Special Publication No. 56-5018, 1, it takes 40 to 60 minutes for one cycle (8
This is a significant improvement in efficiency compared to the conventional method, which requires 8 to 12 cycles per hour and a throughput of approximately 2 to 2.5 tons of objects.

Also, the diameter of the cylinder is 150cm.
A set of hydraulic cylinders with a capacity of 20 kg/CIl+ is sufficient for use. The furnace length is determined by the processing speed and residence time of the object to be processed, but the results obtained in this example are sufficient to serve as a reference when separating iron and aluminum.

As the fuel oil or gas, dry distilled gas or oil from waste rubber tires was suitably used, and the total calorific value of the fuel consumed for 8 hours of continuous operation was 1.5XIo''kcal.

Embodiment 2 FIG. 2 shows a metal melting furnace for separately melting and separating two types of low melting point metals (aluminum and copper) from an object to be processed, such as a motor.

In Fig. 2, reference numeral 1 denotes a tilted furnace body, which has an outer wall, a framework (not shown), etc. that maintains the outer shape of the furnace body, and an internal ceiling part 1' and side walls made of refractory bricks. V I am. 2-A is the upper hearth of the upper stage, 2-8 is the upper hearth of the lower stage, and 3 is the lower hearth. A smooth steel plate is preferably used as the floor plate, but the part near the side wall of the hearth is designed so that the object 4 to be processed can move downward along the hearth without colliding with or damaging the side wall. It is preferable to curve or bulge the side wall upwardly or to attach a steel plate lining to all or part of the side wall (at a predetermined height or width). The back side of the hearth is covered with refractory insulation.

The inclination of the hearth is such that in the upper hearths 2-A and 2-B, all of the objects 4 to be processed do not slide down or fall due to their own weight or only due to their own weight and inertia of movement, but due to the downward force along the hearth. It should be possible to move smoothly. For example, a processing object feeding table 6 is provided (in some cases, integrally with the upper hearth) in an appropriate length direction from the upper hearth 2- to the outside of the furnace, and on the processing object 4-1 and 4-2 are reserved for the next delivery. The object to be processed is fed into the furnace by opening the door or sliding door 5 at the upper end of the upper hearth 2-A and advancing the extrusion part 8 of the pusher 7, but the feeding pressure is gradually lowered. Objects 4-Y-4 and 4-Y-2 were transferred to the objects 4-Y-4 and 4-Y-2 from which all the low-melting metals or alloys at the lowest position of the lower hearth were eluted by moving the row of objects downward.
is slid down from the lower end of the lower upper hearth 2-B to reach the north of the lower hearth 3, and is caused to slide or fall on the lower hearth.

At this time, when the slope of the upper hearth is appropriate, the objects to be processed that are lined up from the top downward along the hearth are moved smoothly in their respective order by a relatively small Phunong Yar force. . For example, in the case of a motor, the angle of the smooth steel plate E when it starts to fall or slide down is about 12 to 15 degrees with respect to the horizontal plane. The preferred inclination is usually 10 to 126 degrees with respect to the horizontal plane, and it is often preferable to install it at about 1 y to 1 y. In such a case, press lightly with the buttons 1 and 1, and the bodies will move downwards in a relatively intact order; 2! Koaro (
Only a certain number of objects to be processed that have been sent into the pusher slide down or fall, but when the pusher is stopped at the time of falling, the row of objects to be processed also stops at the same time.

The F part hearth 3 collects the iron debris (which has almost completely eluted the two types of low melting point metals) that has slipped or fallen from the lower end of the lower upper hearth 2-A through the door or sliding door 9 at the lower end of the furnace. It plays the role of releasing the debris to the outside by sliding or falling down and opening and closing the cough door or sliding door in conjunction with the operation of the pusher or the sliding of the debris, and the angle is preferably 15" or more in the case of a waste motor. The angle is about 25 to 60 degrees.

Casting steel is preferably used as the steel plate for the upper hearth, and the surface thereof is preferably smooth.

At the bottom of the upper hearths 2A and 2-B, metals 10-A, (aluminum in this case) and 1.0-B, each having a low melting point, flow down over the upper hearth and drip or flow down from their lower ends.
B (copper in this case), receives′/j+i′fH11−
There are auxiliary burners 12-A and 11-B respectively, and auxiliary burners 12-A and 12-B for maintenance if necessary.
In addition, molten metal extraction ports 13-A and 13-B are provided at the bottom of the molten metal reservoirs 11-A and 11-B.

Down arches 14-1 and 14-2 and a down arm 15 can be provided in the upper part of the tilting furnace to guide the flame and prevent outside air from entering.

The main burner 16-A is located in the uppermost space of the upper hearth in the lower stage, and the main burner 16-B is located in the upper space of the lower hearth, and normally only these main burners are operated. . A preheating zone, a heating zone, and a soaking melting zone are formed in the furnace corresponding to the upper hearth in the upper stage to melt and separate aluminum. It also plays the role of a heating zone for melting and separation and a preheating zone for the soaking and melting zone. The temperature inside the furnace, especially in the melting and soaking zone, needs to be high enough to sustain and efficiently melt aluminum (melting point 660°C) and copper (melting point 1083°C), so for example, the outside of the door or sliding door 9 should be An airtight chamber (not shown) is provided to airtightly receive the debris from eluting low melting point metals to prevent heat loss, maintain the temperature at the lower end of the lower upper hearth 2-B, and maintain the temperature of the entire furnace. The need to maintain thermal efficiency is significantly higher than in the case of the furnace of FIG. 1 of Example 1. Also, although the heat loss is somewhat larger than in an airtight room, the tip of the pusher 7 is not an extrusion plate but an extrusion palm like 8 in Figure 2 (which covers the object to be processed in the shape of 7 and opens the upper sliding door or door 5 By using an extrusion structure that minimizes the gap between the door and the suction of the atmosphere, heat loss during feeding of the object to be processed can be reduced.

Main burners 16-A and 16-B perform most of the operation, but auxiliary burner 12-B is used more frequently than 12-A to maintain the temperature of the hot water due to the high melting point of copper.

In order to operate this furnace smoothly, the main burner 16-A
] In addition to adjusting the combustion (energy) of 6-B, dampers 19-A and 19-B (not shown, flue 18-B
It is necessary to properly maintain the lateral feed type damper (corresponding to the above) and 19-C, and a considerable amount of experience and skill is required to properly operate the damper.

Gas or smoke generated by incomplete combustion of oil, plastic, etc. in the preheating zone above the upper hearth is removed from the flue 18.
- It is easy to carry out operations for complete combustion in A. The waste gas from the flue 18-0 is discharged into the atmosphere through a gas scrubbing tower or directly from the chimney.

On the other hand, the remains of the iron ingot released from the lower end of the furnace are transported and transported to the deposition site (not shown) by appropriate transportation means (not shown).
Deposited.

The slope of the upper hearth of the metal melting furnace shown in Fig. 2 is 11 to 1.
The angle of the lower hearth is approximately 48 to 50 degrees, but this angle is suitable for achieving the purpose of the present invention when the object to be processed is a motor weighing approximately 2 kg. It is an angle that varies from 10 to about 15'' for the upper hearth depending on its condition and external friction (of course, it can be 8 degrees or 5 degrees).
Although it is possible to operate at or below this level, this is not preferable, as there is a lot of wasted power, and increased friction may cause disturbances in the transport of objects to be processed within the furnace, such as disturbances in the rows. ).

The temperature inside the furnace is 600-650℃ and 650-650℃ in the preheating zone, heating zone, and soaking melting zone on the upper hearth, respectively.
750°C and 750-900°C, and 900-1300°C and 1300-1400°C in the heating zone and soaking melting zone on the lower upper hearth.

A bar 2, such as a suitable round steel bar, is used to smoothly transfer the object to be processed from the upper hearth of the upper stage to the upper hearth of the lower stage.
0 can be placed laterally, but this is not necessary depending on the structure.

In this embodiment, feeding and discharging are normally performed continuously every 3 to 5 minutes, and at the most efficient operation, 42 objects can be processed per minute. In this case, the number of objects to be processed held in the furnace was 2,500, and the residence time in the furnace was 60 minutes on average.

The amount of material to be treated after 8 hours of continuous operation was approximately 100 tons, and the volume of aluminum obtained by separation was 1,600 kg, and the 7 volume of aluminum was 6.4 kg.
It was a ton. The furnace of the present invention, as in this embodiment, is a 7-melting furnace that continuously melts, separates, and recovers two or more metals with low melting points from scrap, and is not only new in itself, but also has outstanding processing capacity. expensive. In addition, the present invention, which requires the above-mentioned 8-hour continuous treatment, separates and recovers the low-melting point metal from the object to be treated which is substantially composed of one or more types of low-melting point metal and high-melting point metal. This is a melting furnace for metals with low melting points, such as aluminum, copper, and metals or alloys such as tin, lead, zinc, silver, and gold.

Examples of high-melting metals or alloys include metals or alloys such as iron, titanium, and zirconium.

〔effect〕

As shown in Examples 1 and 2, the metal melting furnace of the present invention is of a continuous type, and its throughput is extremely high and fuel consumption is extremely low. (The continuous melting furnace of the present invention, which can separately melt and recover two or more types of low-melting point metals,
This is completely new and has never been seen before. )

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal cross-sectional views showing the structure of the main parts of the melting furnace of the present invention and its operating state when one type of metal with a low melting point is melted and separated, and when two types of metals are melted and separated, respectively. be. In Fig. 1 and Fig. 2, 1... Inclined furnace main body, 2... Upper hearth, 2-A...
Upper hearth in the upper tier, 2-8... Upper hearth in the lower tier, 3... Lower hearth, 4... Object to be treated, 5... Door or sliding door at the upper end of the hearth, 6... - Processing object feeding table, 7... Butcher 9... Door or sliding door at the lower end of the furnace, 1], 11-A, 11-8... Water reservoir, 12.12-8, 12 ~B...Auxiliary burner 13.13-A, 13
-8... Hot water outlet 14.14-1.14-2
... Down arch 15 on furnace ceiling... Down arm 16. 16-A, 16-B... Main burner 17, 17
-A, 17-8... Flue entrance 18.18-A, 18-
B, l8-C--・Flue 19.19-A, 19. −(
:...Dumper 20... Bar applicant Dozen Furnace Industry Agent (6286) Haruyuki Ito (7125)
Yoshimi Yokoyama

Claims (1)

[Claims] In a cylindrical tilting furnace having two or more tilted hearths, (a) the lowest hearth (hereinafter referred to as the lower hearth) contains objects to be treated under their own weight or due to their own weight and movement; The inertia provides a position and inclination for the object to slide or fall to the lower end of the hearth, and the object to be processed cannot slide or fall to one or more other hearths (hereinafter referred to as the upper hearth) due to its own weight or its own weight and inertia of movement. (b) Low melting point metal or metal that melts from the object to be processed and flows down on the hearth at the bottom of the upper hearth. A molten metal receptacle for receiving the alloy and a sump from which the molten metal can be collected and discharged as necessary are provided; (d) Outside the furnace at the upper end of the inclined furnace, there is a table for feeding the body to be treated, and a table for feeding the body on the table into the furnace. and an extrusion device for sequentially moving the objects to be processed on the upper hearth downward, moving the lowest object to be processed onto the lower hearth, and discharging it by sliding or falling on the hearth, (E) The object to be treated on the upper hearth is covered by a flame flow and/or combustion gas directed from the lower part to the upper part of the inclined furnace,
A burner and an exhaust gas duct are provided in a position suitable for maintaining the temperature of the molten metal, and (f) a complete combustion chamber is provided to completely burn the gas, soot, etc. discharged from the duct, if necessary. A metal melting furnace that separates and recovers a low melting point metal or alloy from a workpiece that is substantially composed of one or more low melting point metals or alloys and a high melting point metal or alloy.