JP6443986B2 - Precious metal recovery method - Google Patents

Description

The present invention relates to precious metal recovery method using the equipment to dissolve peeled noble metals from noble metal-containing solid material adhering to the surface of electronic components scrap.

From the solid body material such as an electronic component scrap noble metal is deposited on the surface, dissolution release treatment is generally known by the acid or alkali solution wet process used to precious metal was dissolved peeling recovery.

Further, in order to dissolve peeling a noble metal deposited on a solid body material surface is contacted with acid or alkali solution, since the overlap of the solid body material together only was immersed in the liquid occurs, dissolution release treatment with overlapping portion The contact with the liquid is lowered, and it is difficult to completely dissolve and peel the noble metal. Therefore, like the contact between the solid body material mixture stirred to dissolve release treating liquid in order to homogenize, as a dissolution apparatus also an example using a so-called tilting mixer accompanied by mixing and stirring by a mixing drum傾胴formula It is done. For example, Japanese Utility Model Publication No. 6-56694 shown as Patent Document 1 proposes a metal recovery device using a tiltable crucible type rotary furnace.

In its tilting mixer apparatus for performing rotate mixed stirred dissolution release treatment while being傾胴drum, solid body material and dissolution release treatment as an effective capacity can be dispatched to the drum tilting mixer Since the liquid is limited, it leads to a decrease in the processing ability that can be dissolved and peeled per batch. In particular, in many cases dissolution release treating liquid quantity required to solid body material is made it remarkable.

  For this reason, it is conceivable to increase the drum capacity of the tilting mixer. However, since acid / alkaline liquids may be used as the dissolution peeling treatment liquid, it is resistant to various dissolution peeling treatment liquids such as stainless steel and titanium. There is a problem that it is necessary to use a corrosive material, which increases the equipment cost including the material.

  Japanese Patent Laid-Open No. 2006-70364 shown as Patent Document 2 proposes an apparatus that improves the contact between the cathode and the electrolytic solution by performing electrolysis while rotating the disc-shaped cathode.

Japanese Utility Model Publication No. 6-56694 JP 2006-70364 A

By mixing and stirring using solid material and an acid-alkali dissolution release treating liquid tilting mixer containing the noble metal, in the step of dissolving peeled precious metals recovery, depending on the required amount of dissolution release treating liquid for processing the raw material The amount of raw material that can be processed is determined. That is, as the amount of the dissolution / peeling treatment liquid increases, the amount of the processing raw material can be increased. Therefore, an apparatus having a structure that can be processed efficiently at low cost is desired. In the one shown in Patent Document 2, since the drum is not tilted rather than the tiltable mixer, more dissolution and peeling treatment liquid can be put into the drum than the tiltable mixer, but the treatment is performed at a time. The raw material that can be used is determined by the amount of the dissolution / peeling treatment solution, and cannot be processed beyond the dissolution / peeling treatment solution that can be put in the drum alone.

In the dissolution release treatment per batch, in order to improve the processing capability of dissolving peeled noble metal from the solid body material, as production efficiency can be processed more than effective capacity dissolvable release treatment drum single tilting mixer Is desirable.

Therefore, the present invention has been made in view of the above-mentioned problems, and its object is to dissolve and exfoliate the precious metal contained in the solid raw material with respect to the effective capacity of the drum of the tiltable mixer. The object is to provide a method capable of dissolving and recovering precious metals in excess of the processable amount of a single drum of a tiltable mixer when the amount of dissolution and peeling treatment liquid is large.

In order to solve the above-mentioned problems, the noble metal recovery method of the present invention includes a noble metal dissolution and separation apparatus in which a dissolution and separation treatment liquid circulation means is provided between a drum of a tiltable mixer and a tank for storing a dissolution and separation treatment liquid. When the effective capacity that can be used for dissolving and peeling the precious metal to the drum is maximum C [liter], the precious metal that exceeds the possible processing amount that can be treated by this C [liter] is attached. The solid raw material is charged into the drum, and the dissolution and stripping treatment liquid capable of processing the solid raw material exceeding the possible processing amount by the dissolution and stripping treatment liquid charged into the drum is stored in the tank. It is characterized by circulating the dissolution / peeling solution between them, dissolving and peeling the precious metal beyond the possible processing amount of the single drum of the tiltable mixer.

Further, the noble metal recovery method of the present invention, as the dissolution peeling treatment liquid circulation means, a liquid feed pipe for feeding liquid from the tank to the drum, a drain pipe for draining from the drum to the tank, A pump is used to circulate the dissolution and peeling treatment liquid between the drum and the tank by the liquid feeding pipe and the drainage pipe, and the discharge port at the tip of the drum side of the liquid feeding pipe has a C [liter] in the drum . The suction port at the tip of the drain side of the drainage pipe is positioned above the liquid level of the dissolution and peeling treatment liquid when it is charged, and the suction port of the dissolution and peeling treatment liquid when C [liter] is charged into the drum . The liquid level of the dissolution and peeling treatment liquid discharged into the drum via the pump is set to a height substantially equal to the liquid level, and is higher than the height of the suction port at the tip of the drain side of the drain pipe. And became Next, a portion of the drainage pipe that has reached the height of the suction port at the front end of the drum side is sucked up from the suction port at the front end of the drum side, and the suction port at the front end of the drum side of the drainage pipe. The dissolved and peeled processing liquid sucked up is drained into the tank via the drainage pipe, and a predetermined amount of the dissolution and stripping processing liquid in the tank is discharged via the liquid feeding pipe. and fed to the pipe the drum distal the drum from the discharge port of the, to Rukoto preferably so as to maintain the liquid level of the processing solution in said drum at a substantially constant height.

According to the present invention, the production efficiency becomes possible to process beyond the solid body material capable soluble peeling drum single tilting mixer is greatly improved.

It is explanatory drawing which shows one Example of the noble metal melt | dissolution peeling apparatus used for the noble metal recovery method of this invention. It is explanatory drawing of the noble metal collection | recovery method of this invention using the melt | dissolution peeling apparatus of the noble metal of this invention shown in FIG.

Next, a precious metal dissolution and peeling apparatus used in the precious metal recovery method of the present invention will be described with reference to FIG.
The precious metal dissolution and separation apparatus used in the precious metal recovery method of the present invention includes a tiltable mixer 1, a dissolution and separation treatment liquid storage tank 2, and a dissolution and separation treatment solution circulation means 3.

The tiltable mixer 1 has basically the same structure as that of a tilting barrel type mixer used for mixing concrete, and includes a base 11, a drum 12, and a drive device 13 for the drum 12. The drum 12 is formed so that the diameters of the lower and upper portions of the drum are gradually reduced, the upper end is open, and a stirring protrusion is provided inside the drum. The driving device 13 includes a motor 131 provided at a lower end portion of the drum 12 for rotating the drum 12 with the vertical center of the drum 12 as a rotation axis, and a drum rotating device 132 for tilting the drum 12. Has been. The drum 12 can be rotated at an arbitrary angle by the drum rotating device 132. In the present application, the angle A formed by the rotation axis of the drum 12 with respect to the horizontal direction is defined as the inclination angle of the drum 12.
The drum 12 exceeded the possible processing amount that can be dissolved and peeled by C [liter] when the maximum effective capacity that can be charged with the dissolving and peeling treatment liquid for dissolving and peeling the noble metal is C [liter]. In addition, the solid raw material to which the noble metal is attached and the C [liter] dissolution / peeling treatment solution are charged.

The tank 2 for storing the dissolution / release treatment liquid is not limited in material and shape as long as it can store the dissolution / release treatment liquid. Further, the tank 2, if the effective capacity to introduce dissolution release treating liquid mixer drum 12 has a maximum C [l], recovering the noble metal by mixing and stirring the solid body material beyond the processing amount of the drum 12 alone as can, the dissolution release treating liquid of which to the entered solid body material exceeds the C [l] min that have at least stored is capacity.

The dissolution / removal treatment liquid circulation means 3 is provided between the drum 12 and the tank 2 while maintaining the dissolution / removal treatment liquid charged into the drum 12 at approximately C [liter], and in excess of C [liter]. The treatment liquid is circulated.
More specifically, the dissolution / peeling treatment liquid circulation means 3 includes a liquid feed pipe 31 provided for sending liquid from the tank 2 to the drum 12, and a drain pipe 32 provided for discharging liquid from the drum 12 to the tank 2. The pump 33 is provided to circulate the dissolving / separating treatment liquid between the drum 12 and the tank 2 by the liquid feeding pipe 31 and the drainage pipe 32.
In the precious metal dissolution and peeling apparatus used in the precious metal recovery method of the present invention, as will be described later, the discharge port 311 at the tip of the liquid feed pipe 31 on the drum 12 side is when C [liter] is introduced into the drum 12. The suction port 321 at the tip of the drainage pipe 32 on the drum 12 side is located above the liquid surface W of the dissolution / peeling treatment liquid, and the liquid level W of the dissolution / peeling treatment liquid when C [liter] is introduced into the drum 12. Located at a height approximately equal to.

As the pump 33, for example, the liquid feed pipe 31 is provided with a liquid feed aired pump 331, and the liquid discharge pipe 32 is provided with a liquid discharge aired pump 332. The aired pump is preferable because it does not cause trouble even in idling and has excellent chemical resistance. However, depending on the mounting position of the liquid feeding pipe 31 and the drainage pipe 32, other pump types may be used. May be a single unit as long as the dissolution and peeling treatment liquid can be circulated.
Then, as will be described later, when the liquid level W of the dissolution / peeling treatment liquid discharged into the drum 12 becomes equal to or higher than the height of the suction port 321 at the tip of the drain side of the drain pipe 32, the pump 33 The amount of the dissolution and peeling treatment liquid that exceeds the height of the suction port 321 at the drum-side tip of the drainage pipe 32 is sucked up from the suction port 321 at the tip of the drum-side, and from the suction port 321 at the tip of the drum 12 side of the drainage pipe 32. The sucked and peeled processing solution is drained into the tank 2 via the drainage pipe 32, and a predetermined amount of the dissolving and stripping solution in the tank 2 is sent via the liquid feeding pipe 31 to the liquid feeding pipe 31. The liquid is supplied to the drum 12 from the discharge port at the tip of the drum 12 so that the liquid level W of the processing liquid in the drum 12 is maintained at a substantially constant height.

Next, the noble metal recovery method of the present invention using the above-described noble metal dissolution and peeling apparatus will be described.
It is assumed that the effective volume of the dissolution / peeling treatment liquid that can be charged into the drum 12 of the tiltable mixer is a maximum C [liter]. In this case, C the amount of solid bodies feedstock exceeding the processing amount that can be processed by the [l] to handle was put into the drum 12, dissolved release treating liquid that has been put into the drum 12 (C [L]) storing the dissolution release treating liquid processing amount can process minute solid body material exceeds by a tank 2.

Then, the solid body material exceeding the processing amount of the drum 12 alone was placed in the drum 12, is set to a predetermined angle of the drum 12 by the drum rotating device 132 rotates the drum 12 by driving the motor 131, Between the drum 12 and the tank 2, the dissolution / peeling treatment liquid is circulated by the liquid feed aired pump 331 and the drainage aired pump 332. As a result, the precious metal can be dissolved and peeled and recovered beyond the possible processing amount of the drum 12 of the tiltable mixer.

When circulating the dissolution / peeling treatment liquid, specifically, as shown in FIG. 2, for example, the drum rotation device 132 sets the inclination angle of the drum 12 to 30 °. However, the inclination angle of the drum 12 is not limited to 30 °. Then, put in the drum 12 the dissolution release treating liquid so that the liquid level W is, for example, the position shown in a state which supplied the solid body material. Then, the discharge port 311 at the tip of the liquid feed pipe 31 on the drum 12 side is positioned above the liquid surface W of the dissolution / release treatment liquid when C [liter] is introduced into the drum 12. Further, the suction port 321 at the tip of the drainage pipe 32 on the drum 12 side is positioned to be approximately equal to or slightly below the liquid level W of the dissolution and peeling treatment liquid when C [liter] is introduced into the drum 12.

By doing so, the liquid level W can be maintained at a substantially constant height in the drum 12. By the drained aird pump 332, when the level W of the dissolution and peeling treatment liquid in the drum becomes equal to or higher than the suction port 321 at the drum-side tip of the drainage pipe 32, it quickly becomes higher than the suction port 321. Only a portion of the dissolved and peeled processing solution is sucked up from the suction port 321 and discharged into the tank 2. Also, dissolution peeling is promoted by dissolving release treating liquid discharged from the discharge port 311 of the liquid supply pipe 31 by the fluid supply air de pump 331 befall as shower solid body material that protrudes from the liquid surface W The Rukoto.

In the following examples and comparative examples, the effective capacity of the inclination angle of 30 ° when the drum using a tilting mixer 200L, was Ag recovered from Ag grade 17% of the solid body material. Note that nitric acid dissolved stripping treatment liquid required for Ag grade 17% of the solid body material 75 kg is 950 L.

Example 1
A drum set to an inclination angle 30 ° of tilting mixer was charged with Ag grade 17% of the solid body material 75kg and nitric acid dissolved release treating liquid 200L, stored remaining 750L of nitric acid dissolved stripping treatment liquid to the tank, while circulating between the tank and the tilting mixer liquid transfer pipe and drain pipe by 50L / min, was 2 hours mixed and stirred at a drum rotational speed 7.5 rpm, Ag grade solid body material residue is <0 The recovery rate by dissolution peeling was 99.9% or more.

(Comparative Example 1)
The treatment was performed with the effective capacity of the tilting mixer drum as in the conventional method.
More specifically, the drum set to an inclination angle 30 ° of tilting mixer was charged with Ag grade 17% of the solid body material 15kg and nitric acid dissolved release treating liquid 200L, the drum single tilting mixer Dissolution peeling was performed. Was 2 hours mixed and stirred at a drum rotational speed 7.5 rpm, Ag grade solid body material residue as the recovery rate by dissolving peeling was <0.001%, was 99.9%.

(Comparative Example 2)
It was treated five times the solid body material of the effective capacity of the drum also tilting mixer as in Example 1 by conventional methods.
More specifically, the drum set to an inclination angle 30 ° of tilting mixer was charged with Ag grade 17% of the solid body material 75kg and nitric acid dissolved release treating liquid 200L, the drum single tilting mixer Dissolution peeling was performed. Was 2 hours mixed and stirred at a drum rotational speed 7.5 rpm, Ag grade solid body material residue as high as 10% level, the recovery rate was only 40%.
In addition, although each said example demonstrated the collection | recovery method of Ag, the noble metal collect | recovered by this invention is not restricted to Ag. Further, the example in which the tilt angle of the tiltable mixer drum is 30 ° has been described, but the drum tilt angle is not limited to 30 °.

DESCRIPTION OF SYMBOLS 1 Inclinable mixer 11 Base 12 Drum 13 Drive apparatus 131 Motor 132 Drum rotation apparatus 2 Tank 3 Circulation means 31 Liquid feed pipe 311 Discharge port 32 Drain pipe 321 Suction port 33 Pump 331 Liquid feed air pump 332 Drain Liquid air pump A Inclination angle W Liquid level

Claims (2)

  Dissolving and peeling for dissolving and removing the noble metal on the drum using a noble metal dissolving and peeling device provided with a circulating means for dissolving and peeling treatment liquid between the drum of the tilting mixer and the tank for storing the dissolution and peeling treatment liquid When the effective capacity capable of supplying the treatment liquid is C [liter] at the maximum, the solid raw material to which the precious metal adhered, exceeding the possible processing amount that can be processed by this C [liter], is introduced into the drum, and is introduced into the drum. Stored in the tank is a dissolution and peeling treatment liquid capable of processing a solid raw material in excess of the possible processing amount by the dissolution and peeling treatment liquid, and circulates the dissolution and peeling treatment liquid between the drum and the tank, so that the tilt type A precious metal recovery method, wherein the precious metal is dissolved and peeled and recovered exceeding the possible processing amount of the drum unit of the mixer. As the dissolution peeling treatment liquid circulation means, a liquid feed pipe for feeding liquid from the tank to the drum, a drain pipe for draining liquid from the drum to the tank, the liquid feed pipe and the drain pipe Using a pump for circulating the melt-release treatment liquid between the drum and the tank,
The discharge port at the drum-side tip of the liquid feeding pipe is positioned above the surface of the dissolution and peeling treatment liquid when C [liter] is put into the drum, and the suction at the drum-side tip of the drainage pipe is taken. The mouth is positioned at a height substantially equal to the surface of the dissolution and removal treatment liquid when C [liter] is charged into the drum,
When the liquid level of the dissolution and peeling treatment liquid discharged into the drum via the pump becomes equal to or higher than the suction port at the drum-side tip of the drainage pipe, the drainage pipe The amount of the dissolution / removal treatment liquid that has reached the height of the suction port at the front end of the drum is sucked up from the suction port at the front end of the drum side, The liquid is discharged into the tank through the liquid discharge pipe, and a predetermined amount of the dissolution / peeling treatment liquid in the tank is discharged through the liquid supply pipe to the discharge port at the tip of the drum of the liquid supply pipe. and fed to further the drum, precious metal recovery method of claim 1, characterized in that to keep the liquid level of the processing solution in said drum at a substantially constant height.

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