JP2003064425A - Treatment device of precious metal scraps - Google Patents

Abstract

PROBLEM TO BE SOLVED: To objectively evaluate the raw material value of precious metal scraps by realizing sand-like powder of the uniform grade of precious metal scraps, and to reliably prevent a refining equipment from being adversely affected during the treatment by quantitatively grasping a composition of impurities, and adjusting the charging quantity. SOLUTION: A treatment device bakes the precious metal scraps by a pre- treatment furnace 11 in a step before refining the precious metal scraps together with copper, and generates sand-like powder 2 in which combustibles are completely ashed from the precious metal scraps. A combustion mechanism A for burning the combustibles in the precious metal scraps is provided. The combustion mechanism A comprises a fuel source 12, a burner unit 13 connected to the fuel source 12, and a feed unit 14 for feeding the fuel from the fuel source 12 to the burner unit 13. A rotating and mixing mechanism for rotating and mixing the precious metal scraps in the pre-treatment furnace 11 is provided, and the rotating and mixing mechanism comprises a rotating mechanism and a mixing mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noble metal scrap treating apparatus suitable for carrying out a pretreatment of a smelting process for taking out a noble metal from a scrap containing a noble metal, and the treating apparatus and the processing apparatus generated therein. The present invention relates to a pretreatment facility for precious metal scraps, which is provided with a facility for treating exhaust gas.

[0002]

2. Description of the Related Art In recent years, a large amount of printed circuit boards used for personal computers and the like have been discarded. The discarded printed circuit boards (hereinafter referred to as noble metal scraps) use not only various metals but also noble metals. Has been done. Therefore, in order to recover the precious metal contained in the precious metal scrap, for example, copper smelting or the like may be used.

FIG. 10 shows a smelting method for extracting precious metal scrap from conventional copper smelting. In FIG. 10, when the precious metal scrap 1 is introduced together with the copper raw material (copper concentrate, etc.) into the smelting furnace 41 and the auxiliary raw material such as a solvent is introduced, the copper concentrate in the smelting furnace 41 is introduced. Is melted together with the noble metal scrap 1, where it is separated into upper layer copper slag (karami) and lower layer mat (kawa) due to the difference in specific gravity.

Next, when the mat is extracted from the kneading furnace 41 and sent to the converter 42, the copper sulfide in the mat is oxidized in the converter 42 to obtain crude copper. When the crude copper obtained by the converter 42 is sent to the refining furnace 43, it is oxidized and then reduced to be refined into higher quality copper, whereby refined copper (anode) is obtained. Thereafter, the refined copper is extracted and cast to form an anode plate, and this anode plate is made into electrolytic copper by an electrolytic cell in a copper electrolysis plant 44.

On the other hand, the remaining molten material (slime) converted from the anode plate into electrolytic copper is classified and extracted by the precious metal factory 45 for each kind, and as a result, Au, Ag, Pt contained in the precious metal scrap 1 is obtained. , Pd, Te, Se and other noble metals are formed.

The smelting method shown in FIG. 10 is generally called a direct charging type, but other than that, for example, other conventional techniques shown below are also performed. That is, in the second conventional technique, the precious metal scrap 1 is immersed in the chemical in advance, and the valuable metal is eluted by the chemical to recover the precious metals.

Further, in the third conventional technique, the precious metal scrap 1 is burned in a rotary kiln provided in a pretreatment facility, whereby the combustible portion of the precious metal scrap 1 is ashed and then ashed. The smelting furnace 4 shown in FIG.
1 and various converters 42 so that various precious metals can be obtained.

[0008]

By the way, in the above-mentioned first prior art, since the concentrations of the components contained in the precious metal scrap 1 are unknown, when the precious metal scrap 1 is charged into the smelting furnace 41. However, the viscosity of the melt in the smelting furnace 41 increases, the copper loss of the copper slag obtained in the smelting furnace 41 increases, and the smelting control becomes unstable. The cause is presumed to be influenced by gangue components and impurities other than the noble metal components contained in the noble metal scrap. In addition, if the smelting control becomes unstable, there is a problem that an appropriate amount of the auxiliary raw material to be charged into the smelting furnace 41 becomes excessive and deficient, and it becomes impossible to execute good smelting.

Further, the heat generated in the smelting furnace 41 can be recovered by utilizing it in an exhaust heat boiler or the like. However, when the combustible material adhering to the precious metal scrap 1 burns, the generated heat is large and the exhaust heat is exhausted. Since the heat load of the boiler increases, not only the amount of precious metal scrap 1 to be processed must be limited, but also the volatile elements in the combustibles are mixed with the exhaust gas, which causes corrosion of the exhaust heat boiler. was there.

In the second prior art, valuable precious metal is eluted by immersing precious metal scrap 1 in a chemical, but this is not suitable for large-scale processing such as dry smelting.

Further, in the third prior art, in the pretreatment facility, the precious metal scrap 1 is incinerated by burning it in the rotary kiln, but when the rotary kiln is used, the precious metal scrap is charged from one side and burned. Then ashed,
Moreover, since the ashed ones are continuously discharged from the other, there is a concern that uneven burning will occur in precious metal scrap and combustion will vary. It is expected that a problem similar to that of the first related art may occur. Moreover, not only the pretreatment facility requires a large space, but also the construction cost rises.

On the other hand, as shown in FIG. 11, the supplier (supplier) who handles the precious metal scrap 1 conducts a transaction with the smelter for the sale of the precious metal scrap 1. At the time of the transaction, an invoice is sent ( This is called inquiry 51). The smelter considers the invoice from the supplier and, if interested, negotiates and accepts the terms.
In this case, the sample may be examined in advance or the sample may be shipped. When receiving goods, weigh JI
Samples are randomly sampled based on S (53)
Various precious metals contained in the precious metal scrap 1 are analyzed (54), and the purchase price of the precious metal scrap 1 to be delivered is determined based on the analysis result (5).
5).

However, the analysis value and the purchase price by the smelter may occasionally cause a trouble between the smelter and the supplier. In other words, as a supplier, since the smelter is manually sampling, as a result of questioning the analysis content and purchase price,
In some cases, there were inconveniences with smelters.

In order to solve each of the above inconveniences, it is necessary to objectively evaluate the quality of the noble metal scrap to be charged into the smelting furnace 41. From this point of view, as a processing device for firing the noble metal scrap in advance, It is desired to provide an apparatus capable of obtaining a sandy powder capable of analyzing components with uniform quality after firing.

However, in the conventional art, no processing apparatus for converting such noble metal scrap into a uniform substance has been provided.

Conventionally, as the metal recovery apparatus, various pretreatment furnaces have been provided in Japanese Utility Model Laid-Open No. 57-70097, JP-A-2-240223, JP-A-63-199828, etc., but all of them are provided. It simply collects metal from waste materials, not for precious metal scrap,
The analysis of the components of the sandy powder after firing is not considered.

The present invention has been made in view of the above circumstances, and an object thereof is an apparatus for pulverizing precious metal scrap into sandy powder to obtain a sample of uniform quality in order to avoid trouble with a supplier. And to provide a noble metal scrap processing apparatus capable of reliably preventing the smelting equipment from being adversely affected by providing the noble metal scrap with a sandy powder of uniform quality. .

[0018]

In order to achieve the above object, the present invention proposes the following means. The invention according to claim 1 is directed to a pretreatment furnace for firing the noble metal scrap that has been input into a sandy powder, a combustion mechanism for firing the noble metal scrap in the pretreatment furnace, and a pretreatment furnace in the pretreatment furnace during combustion. It is characterized by comprising a rotating / mixing mechanism for rotating and mixing precious metal scrap, and a sandy powder receiving section for receiving the sandy powdery sandy powder in the pretreatment furnace as a component analysis target. And

According to the processing apparatus of the present invention, all the combustibles of the precious metal scrap are surely burned to be sandy powder, and the precious metal scrap can be uniformly sandy powdered. A uniform sandy powder can be easily obtained.

According to a second aspect of the present invention, in the rotating / mixing mechanism, the upper opening of the pretreatment furnace is positioned above, and the central axis passing through the center of the upper opening is inclined with respect to the vertical line. It is characterized in that it is configured to rotate the pretreatment furnace.

According to the processing apparatus of the present invention, since the pretreatment furnace is rotated while being inclined, the precious metal scrap can be rotated and mixed well, and even if a large amount of the precious metal scrap is charged, a uniform sand-like state can be obtained. It is possible to reliably obtain a powder.

According to a third aspect of the present invention, in the precious metal scrap treating apparatus according to the first aspect or the second aspect, it is possible to advance or retreat the exhaust gas generated during combustion to the opening of the pretreatment furnace. It is characterized by having a flue with a local exhaust hood provided.

According to the treatment apparatus of the present invention, the exhaust gas generated from the precious metal scrap during combustion is brought out by bringing the flue and the treatment apparatus into close contact with each other by the local exhaust hood, so that the components of the precious metal scrap are generated. Even if the exhaust gas is unknown, it can be handled safely.

The invention according to claim 4 is a treatment apparatus for precious metal scraps according to claim 3, and the treatment equipment,
An exhaust gas cleaning treatment facility for cleaning the exhaust gas discharged through the flue with cleaning water, and a specific gravity separation device for separating unburned carbon and heavy metals in the exhaust gas cleaning liquid generated from the cleaning treatment facility. .

According to the pretreatment equipment of the present invention, the waste gas generated in the treatment equipment is washed by the washing treatment equipment,
Carbon, heavy metals, etc. in the cleaning liquid are separated by the specific gravity separator.

According to a fifth aspect of the present invention, in the pretreatment facility for precious metal scraps according to the fourth aspect, the specific gravity separator is a treatment tank into which a cleaning liquid for cleaning exhaust gas is introduced, and a bottom portion in the treatment tank. A first shield plate which is provided on the base plate, prevents the substance having a high specific gravity settled on the bottom from moving to the first adjacent region, and allows the cleaning liquid to pass therethrough to the first adjacent region; It is installed in the upper part of the treatment tank and blocks the movement of the substance with a low specific gravity floating on the surface of the washing water to the second adjacent area, and below it the movement of the washing water to the second adjacent area. And a second shield plate that allows the cleaning water to reach the second adjacent region and circulate the cleaning water to the cleaning treatment facility.

According to the pretreatment facility according to the present invention, a substance having a large specific gravity and a substance having a low specific gravity are separated from the cleaning water for cleaning the exhaust gas, and the cleaning water is circulated to the cleaning treatment facility for reuse.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a pretreatment facility according to an embodiment of the present invention, FIGS. 1 to 3 show a treatment device provided in the pretreatment facility, and FIG. 4 shows an overall view of the pretreatment facility. .

1 to 4, in the processing apparatus 10, the pretreatment furnace 11 burns each precious metal scrap in a lot before it is smelted together with copper. Is completely ashed to produce a sandy powder 2 which is sandy powdered.

As shown in FIGS. 1 to 3, in the pretreatment furnace 11, the inner container is made of stainless steel and the outer container is made of steel, and a ceramic wool heat insulating material is sandwiched between them. Only the upper part is opened. It has a bottomed cylindrical shape of a triple structure having an opening 11a. Moreover, in the pretreatment furnace 11, FIG.
As shown in (e), 11d is provided along the body 11c. The number of the stirring plates 11d attached is one or more.

The processing unit 10 is, as shown in FIG.
When the precious metal scrap is charged into the pretreatment furnace 11, a combustion mechanism A for burning the combustible material of the precious metal scrap is provided.

The combustion mechanism A includes a fuel source 12 such as propane and a burner section 13 connected to the fuel source 12.
And a supply unit 14 for sending fuel from the fuel source 12 to the burner unit 13, and ignites the propane gas injected by the burner unit 13 to burn the precious metal scrap 1 in the pretreatment furnace 11. It has become. The fuel used in the combustion mechanism A may be liquid fuel such as kerosene (kerosene) in addition to propane.

Further, the processing apparatus 10 is provided with a rotation / mixing mechanism B for stirring the precious metal scrap therein by tilting and rotating the pretreatment furnace 11 as shown in FIGS. The rotating / mixing mechanism B includes a rotating mechanism B1 and a mixing mechanism B2.

The processing apparatus 10 includes a support 1 and a frame 1 on a support 16.
7 is rotatably supported, and the pretreatment furnace 11 is rotatably supported by the frame 17. That is, the support base 16 has support legs 16a and 16a.
A frame 17 is rotatably supported between 6a and 16a via a rotary shaft 18. A pretreatment furnace 11 is rotatably supported on the frame 17, and the pretreatment furnace 11 is rotationally driven by a rotating mechanism B1.

The rotating mechanism B1 includes a motor 19 with an inverter supported on the frame 17, a pulley 19a for transmitting the rotating force of the motor 19 to the rotating shaft of the pretreatment furnace 11,
19b and a belt 19c. The mixing mechanism B2 tilts the rotation axis of the pretreatment furnace 11 at a predetermined angle with respect to the vertical line, and supports the support leg 16a of the support base 16.
A motor 20 with an inverter supported by the pulleys, and pulleys 21a, 2a for transmitting the rotational force of the motor 20 to the rotary shaft 18.
1b and a belt 21c.

Under this structure, the rotation / mixing mechanism B is shown in FIG.
As shown in (b) and (c), the upper opening 11a of the pretreatment furnace 11 is located above and the upper opening 11a is
The pretreatment furnace 11 can be rotated by inclining the central axis passing through the center of a with respect to the vertical line. Thus, the pretreatment furnace 1
When the precious metal scrap 1 is burned, the mixing mechanism B2 tilts it at an appropriate angle, and the tilting mechanism 1 rotates the rotating mechanism B1 at a desired speed to keep the precious metal scrap 1 from the pretreatment furnace 11. It is moved inside and mixed by the stirring plate 11d.

The pretreatment furnace 1 using the rotating mechanism B1
Regarding the rotation speed of 1, the noble metal scrap 1 in the pretreatment furnace 11 can be rotated and mixed without being in a fixed position,
Moreover, the speed is about 5 rpm at which combustion and ashing can be surely performed while rotating and mixing, but the present invention is not limited to this. The inclination angle of the pretreatment furnace 11 is 20 to 40 °.
In the range of 1, the combustion state is satisfactorily obtained, and 30 ° is particularly desirable. At this time, if the temperature inside the pretreatment furnace 11 is raised to about 400 ° C., the effect becomes more remarkable.

The pretreatment furnace 11 has a bottom portion 11
b is formed flat with an area equal to that of the upper opening 11a, while the peripheral portion of the upper opening 11a is narrowed and the body 11c is formed perpendicular to the bottom 11b to prevent gas leakage, It is possible to increase the stirring efficiency and the processing amount.
The processing capacity of the precious metal scrap 1 in the pretreatment furnace 11 is about 300 Kg to 1 T per batch processing amount.

Further, the processing apparatus 10 is provided with a flue 23b having a local exhaust hood 23a for discharging the exhaust gas generated by the combustion of the precious metal scrap 1 when the precious metal scrap 1 is burning in the pretreatment furnace 11. There is. Local exhaust hood 23a
As shown in FIG. 1 and FIG. 5 (c), is provided at the end of the flue 23 b, and is the upper opening 1 of the pretreatment furnace 11.
It has a crowned portion 11c covering 1a and an exhaust port at the center thereof.

The local exhaust hood 23b is movable at its tip end with respect to the flue 23b installed at a fixed position, and when the precious metal scrap 1 is burned, an upper opening is provided by advancing and retracting means (not shown). It moves forward in the direction 11a, covers the upper opening 11a, and guides the combustion gas and smoke generated in the pretreatment furnace 11 into the flue 23b to prevent smoke leakage. When the burning is completed and the precious metal scrap 1 is ashed and pulverized into sandy powder, the precious metal scrap 1 is set back from the upper opening 11a.

As shown in FIG. 4, the terminal side of the local exhaust hood 23 is connected to an exhaust gas cleaning treatment facility C via a flue 23b. The exhaust gas cleaning treatment facility C has a flue 23b.
A cooling tower P for cooling the exhaust gas introduced through the cooling tower P, and a shelf 24 containing a filler for removing harmful substances in the exhaust gas taken in through the cooling tower P, and a shelf 24 placed above the shelf 24 The scrubber 27 is provided with a shower unit 25 for injecting water and a recovery receiving unit 26 disposed below and recovering water from the shower unit 25. A chimney 29 is connected to the upper part of the scrubber 27 via a blower 28, and the recovery pipe 26 is connected to the recovery pipe 26 of the scrubber 27.
It is connected to the specific gravity separation device 31 via 0.

The specific gravity separator 31 is for separating dusts, such as unburned carbon, heavy metals, etc., from the cleaning water in which the exhaust gas has been cleaned. As shown in FIG. 6, the cleaning liquid in which the exhaust gas has been cleaned is introduced. The tank 35 and the bottom of the processing tank 35 are provided to prevent movement of a substance 36 having a heavy specific gravity such as heavy metal deposited on the bottom to the first adjacent region 35a and above the cleaning water 37 above the first adjacent region 35a. The first shield plate 38 that allows passage to the one adjacent region 35a, and the second shield plate 38 provided on the upper portion of the treatment tank 35 and the second substance 39 that has a low specific gravity such as unburned carbon and floats on the surface of the cleaning water 37. The second shielding plate 40 is provided to prevent the movement to the adjacent region 35b and to allow the movement of the wash water to the second adjacent region 35b below.

Under this structure, the washing water from the shower section 25 is introduced from the recovery receiving section 26 through the connecting pipe 30 into the specific gravity separating apparatus 31, and this specific gravity separating apparatus separates the washing water and the dust. . The dust contained in the cleaning water is shielded by the shield plates 38 and 40 provided in the specific gravity separator 31.
Heavy ones will settle and light ones will be blocked.

Therefore, the cleaning water is made relatively clean and is circulated to the shower unit 25 through the circulation pump 32 and the filter 33 for use. Then, the precipitate in the specific gravity separator 31 is guided in the direction of arrow a using a portable pump (not shown) at an appropriate time when the operation is stopped, dried, and processed in a smelting facility. In addition, suspended solids are scraped off at the same time, collected, and processed in a smelting facility. In addition, makeup water is supplied to the specific gravity separator 31 from the pipe b.

In FIGS. 4 and 5, reference numeral 34
Is a container (sandy powder receiving part) for receiving and transferring the sandy powder 2 in the pretreatment furnace 11 as a component analysis target.

Since the processing apparatus of this embodiment is configured as described above, for example, when smelting a noble metal from the noble metal scrap 1, first, in the stage before the copper smelting process, the process shown in FIG. As shown in (a), the upper opening 11
Then, the pretreatment furnace 11 is charged into the pretreatment furnace 11 from a, and then the pretreatment furnace 11 is tilted obliquely by the driving of the mixing mechanism B2 of the rotation / mixing mechanism B as shown in FIG. The noble metal scrap 1 starts to burn by inserting the burner portion 13 of the above into the pretreatment furnace 11 and igniting.

In this case, when the precious metal scrap 1 burns, the burner section 13 of the combustion mechanism A is retracted from the pretreatment furnace 11, and as shown in FIG.
a is moved forward by advancing / retreating means (not shown)
The exhaust gas generated by burning the precious metal scrap 1 covering the upper opening 11a of the exhaust gas No. 1 is the local exhaust hood 23a and the flue 23.
It is derived from b.

Further, in that case, the pretreatment furnace 11 is rotated around the central axis by driving the rotating mechanism B1 of the rotating / mixing mechanism B in an inclined state, so that the stirring plate mounted in the pretreatment furnace 11 is rotated. Precious metal scrap 1 due to the effect of 11d
Are agitated so that all combustibles are properly incinerated.

Exhaust gas discharged from the local exhaust hood 23a and the flue 23b is sent to the scrubber 27 shown in FIG. The dust dropped by the wash water is sent to the specific gravity separator 31.

Further, as shown in FIG. 5 (d), when the precious metal scrap 11 is completely burned to produce the sandy powder 2, the pretreatment furnace 11 retreats the local exhaust hood 23 and rotates. After it is stopped, it is visually confirmed that it is completely ashed, and the mixing mechanism B2 of the rotating / mixing mechanism B is tilted as shown in FIG. Transfer to.

Then, the sandy powder 2 in the container 34
Is controlled for each lot, and various precious metals are specified by sampling and analyzing the condition.

Therefore, the processing apparatus 10 of this embodiment is
By the pretreatment furnace 11, the combustion mechanism A, and the rotation / mixing mechanism B, the precious metal scrap 1 is burned in the pretreatment furnace 11 before the smelting treatment, so that all the combustibles of the precious metal scrap 1 are burned. Since it is surely combusted to be ashed and can be uniformly sandy powdered, a uniform sandy powdered product 2 can be easily obtained.

Further, since the rotating / mixing mechanism B rotates the pretreatment furnace 11 equipped with a stirring plate around the central axis with the central axis tilted from the vertical direction, the precious metal scrap 1 can be well stirred. Therefore, even if a large amount of precious metal scrap 1 is charged, a uniform sandy powder 2 can be surely obtained.

Further, since the exhaust gas generated from the precious metal scrap 1 at the time of combustion is led out by the local exhaust hood 13,
Even if the component of the precious metal scrap 1 or the exhaust gas to be generated is unknown, it is possible to safely handle it.

When the uniform sandy powder 2 is sampled for each lot and various noble metals are specified, the quality of the noble metal and the components of other impurities are clarified. Therefore, the sandy powder 2 is shown in FIG. As shown in the figure, if it is put into the smelting furnace 41 (or the converter 42) of the copper smelting equipment according to the processing content of the smelting equipment, the stable state of smelting control can be maintained and the waste heat boiler will be adversely affected. Is eliminated, and the conventional problems can be solved.

That is, as compared with the first conventional technique, the combustible substances adhering to the precious metal scrap 1 do not burn in the smelting furnace 41, and the impurity components of the substance to be treated (the precious metal scrap 1) are known. Because the amount of impurities can be adjusted to control the amount of processing, the stable state of smelting control can be maintained, the copper loss in copper slag increases, and the appropriate amount of auxiliary raw material must be added in excess or deficiency. In addition, it is possible to prevent an increase in heat load and corrosion of the exhaust heat boiler, and there is no adverse effect.

With such an effect, when the sandy powder 2 to be charged is selected for each lot in view of the impurity component analysis value and the weight, the amount of the impurity component contained in the precious metal scrap 1 is different for each lot. Nevertheless, since the smelting control can be maintained stable, the smelting can be performed better.

Further, as compared with the second prior art in which valuable metal is eluted by a chemical, only the precious metal scrap 1 is fired in the pretreatment furnace 11 into a sand-like powder material without combustible material, so that the processing amount should be secured. You can

Further, as compared with the third prior art in which combustion is carried out in a rotary kiln, the fear of uneven burning can be eliminated, so that not only the above-mentioned good smelting can be realized, but also pretreatment equipment can be used. There is an advantage that it does not require a large space and can prevent the construction cost from rising.

In the rotary kiln, the inlet is provided in the upper part of the furnace, the outlet is provided in the lower part, and the entire furnace is inclined to promote the movement of the combustion products. Although the pretreatment furnace 11 of the present treatment apparatus 10 is inclined to perform combustion, it is not inclined to improve the flow like a rotary kiln, but scraps ignited at the upper part are moved downward at the inclined surface. It is made to move and at the same time to be brought into sufficient contact with air, and an effect that combustion is uniformly and favorably obtained is obtained.

On the other hand, as described above, the noble metal component is specified from the uniform sandy powder 2 before the copper smelting, and the type and amount of the noble metal component 1 contained in the noble metal scrap 1 are determined based on the identified noble metal component. Since accurate analysis can be performed, the supplier and the smelter have the relationship shown in FIG. Here, in the present invention, what is different from the conventional example shown in FIG. 11 is that the entire amount of the sample 52 is burned to ash 56 between the sample 52 and the sampling 53 in order to obtain the sandy powder 2. is there.

Therefore, when the purchase price is determined based on the content of the ingredients and the purchase price is presented to the supplier who made the inquiry 51, it is possible to evaluate and convince the supplier that the raw material price is fair. , It is possible to prevent troubles between the supplier and the smelter as before.
It becomes possible to build a good relationship between both parties. In FIG. 7, the same symbols as those in FIG. 11 represent the same items.

Further, according to the above pretreatment facility, the exhaust gas generated in the treatment device 10 can be treated effectively and appropriately. That is, the exhaust gas is washed by the scrubber 27 with the wash water, and the unburned carbon, heavy metals, etc. in the wash water can be separated by the specific gravity separator 31.
Then, since the cleaning water from which these dusts have been removed is circulated again to the cleaning treatment facility, it is possible to obtain the effect of suppressing the amount of cleaning water used.

As a modification of the above embodiment,
As shown in FIG. 8, the stirring plate 1 is attached to the body portion 11c of the pretreatment furnace 11.
In addition to providing 1d, a mixing blade 61 is provided on the bottom portion 11b, and as shown in FIG. 9, the body portion 11c of the pretreatment furnace 11 is provided.
If the annular mixing blade 62 is provided in the, the mixing of the noble metal scrap can be performed more effectively, and the combustion can be performed better.

Further, in the illustrated embodiment, the example in which the printed circuit board used in the computer is used as the precious metal scrap 1 is shown, but the present invention is not limited to this, and any other precious metal-containing one may be used. It can be applied and the same effect can be obtained. Further, as a smelting method for precious metals, an example in which it is applied to copper smelting equipment is shown, but it can also be applied to other smelting equipment.

[0066]

As described above, according to the invention of claim 1, all combustibles of the precious metal scrap are surely combusted and ashed, and the precious metal scrap can be uniformly sand-like powdered, so that it becomes uniform. It is possible to easily obtain a fine sandy powder, and it is possible to obtain the effect that the smelting equipment is not adversely affected.

According to the second aspect of the present invention, the precious metal scrap can be satisfactorily agitated, and a uniform sandy powder can be reliably obtained even when a large amount of the scrap is charged.

According to the third aspect of the present invention, even if the component of the precious metal scrap or the exhaust gas to be generated is unknown, it can be safely dealt with, and the effect of enhancing the safety can be obtained.

According to the fourth aspect of the present invention, the waste gas generated in the processing apparatus can be washed with the washing water, while carbon, heavy metals and the like in the washing liquid can be separated.

According to the fifth aspect of the present invention, it is possible to reliably separate substances having a large specific gravity such as heavy metals and light substances such as carbon from the cleaning water used for cleaning the exhaust gas, and to transfer the cleaning water to the cleaning treatment facility. By circulating the water, the washing water can be reused.

[Brief description of drawings]

FIG. 1 is a diagram showing a metal scrap treating apparatus according to an embodiment of the present invention, and is a side view in a state in which a pretreatment furnace is directed obliquely upward.

FIG. 2 is a view showing the processing apparatus, and is a rear view in a state in which the pretreatment furnace is directed to the side.

FIG. 3 is a view showing the processing apparatus, and is a side view in a state in which the pretreatment furnace faces sideways.

FIG. 4 is an overall layout diagram showing a pretreatment facility also including a treatment device.

5A to 5E are explanatory views showing the operation of the pretreatment furnace in the treatment apparatus.

6 is a vertical cross-sectional view of a specific gravity separator in the pretreatment facility shown in FIG.

FIG. 7 is an explanatory diagram showing a procedure for determining a purchase price based on a sample from a supplier.

FIG. 8 is a vertical cross-sectional view showing a modified example of the pretreatment furnace shown in FIGS.

9 is a vertical sectional view showing another modification of the pretreatment furnace shown in FIGS. 1 to 3. FIG.

FIG. 10 is a flowchart showing a smelting process of precious metal scraps associated with a conventional copper smelting facility.

FIG. 11 is an explanatory diagram of a relationship between a conventional smelter and a supplier, showing a procedure for determining a purchase price based on a sample from the supplier.

[Explanation of symbols]

1 precious metal scrap 2 Sandy powder 10 processor 11 Pretreatment furnace 11a Upper opening 13 Burner section 14 Supply department 16 Support 19,20 Inverter motor 23a Local waste hood 31 Specific gravity separator 34 Sandy powder receiver 37 Wash water 38 First shield 40 Second shielding plate A combustion mechanism B rotation / mixing mechanism B1 rotation mechanism B2 mixing mechanism C Exhaust gas cleaning processing equipment

Front page continuation (51) Int.Cl. ⁷ identification code FI theme code (reference) B09B 3/00 ZAB C22B 7/00 F 4K001 C22B 1/00 601 G01N 1/00 101B 7/00 B09B 3/00 303Z G01N 1/00 101 ZAB 1/28 G01N 1/28 T (72) Inventor Mikio Watanabe 1-5-1 Marunouchi, Chiyoda-ku, Tokyo Shinmaru Building Mitsubishi Materials Corporation Recycling Business Indoor F-term (reference) 2G052 AA11 AA13 AD12 AD35 AD55 CA02 CA03 CA04 CA08 EB11 EB12 ED16 FB07 FC12 FD08 FD16 HA12 HA17 HA19 JA07 JA08 JA11 JA13 JA22 JA24 4D004 AA21 AB03 AC04 BA05 CA30 CB03 CB34 CB43 4D032 AC01 BB07 DA04 4D071 AA62 CA05 DA15 4G068 BA04 BB07 BB10 BC01 BC17 BD02 BD04 4K001 AA01 AA04 AA09 AA41 BA22 CA09 CA15 DA14 GA07 GB09 GB11

Claims (5)

[Claims] 1. A pretreatment furnace that burns the precious metal scrap that is input to ash and combust combustibles into a sandy powder, a combustion mechanism that burns the precious metal scrap in the pretreatment furnace, and a pretreatment furnace during combustion. It is equipped with a rotating / mixing mechanism that rotates and mixes the precious metal scrap inside, and a sandy powder receiving unit that receives the sandy powder that has been ashed and sanded in the pretreatment furnace as a component analysis target. A processing device for precious metal scraps, which is characterized by the following. 2. The noble metal scrap treating apparatus according to claim 1, wherein the rotating / mixing mechanism positions the upper opening of the pretreatment furnace upward and has a central axis passing through the center of the upper opening. An apparatus for treating precious metal scraps, which is configured to rotate the pretreatment furnace while being inclined with respect to a vertical line. 3. The apparatus for treating precious metal scraps according to claim 1 or 2, further comprising: a local exhaust hood provided to the opening portion of the pretreatment furnace, the hood being capable of advancing and retreating for discharging exhaust gas generated during combustion. An apparatus for treating precious metal scraps having a flue. 4. A treatment device for precious metal scraps according to claim 3, an exhaust gas cleaning treatment facility for cleaning exhaust gas generated in the treatment device and discharged through the flue with cleaning water, and the exhaust gas cleaning treatment facility. A pretreatment facility for precious metal scraps, comprising a specific gravity separator for separating unburned carbon and heavy metals in the exhaust gas cleaning liquid generated from the exhaust gas. 5. The pretreatment facility for precious metal scraps according to claim 4, wherein the specific gravity separation device is provided in a treatment tank into which a cleaning liquid for cleaning exhaust gas is introduced, and a bottom portion provided in the treatment tank. The first shielding plate that prevents the heavy specific gravity substance that has settled on the first adjoining region from moving and that allows the cleaning liquid to pass through to the first adjoining region, and the upper part inside the processing tank. A second shielding plate which is provided and blocks the movement of the substance having a low specific gravity floating on the surface of the wash water to the second adjacent area and allows the movement of the wash water to the second adjacent area below. And a pretreatment facility for precious metal scraps, characterized in that the cleaning water reaching the second adjacent region is circulated to the cleaning treatment facility.