JPS58144435A - Method of extracting noble metal from liquid containing noble metal - Google Patents

Abstract

PURPOSE:To easily and inexpensively recover noble metal, by filtering a noble metal-contg. liquid with a cylindrical filter having a wall surface to which a filter medium is applied, stripping off the filter medium and then extracting the adhered noble metal. CONSTITUTION:A filter medium such as paper or fiber materials is mixed in water inside a filtering cell 20, and then the water is let flow through a cylindrical filter 6 from the lower chamber 4 of the filtering cell 1 and circulated through an upper chamber 3 into the cell 20 by pump 15. During this circulation, the filter medium is uniformly stuck to the wall surface of the filter 6. In succession, a noble metal-contg. liquid 17 is circulated between the cell 1 and a liquid tank 16 by the same pump 15, to adhere the noble metal to the filter medium. Thereafter, a cover 29 is opened, the filter 6 is taken out by holding a handle 32, and the filter medium is stripped off and removed therefrom. The nobel metal and ash are then obtained by burning the filter medium, for instance, and the noble metal only is separated and extracted by a method utilizing mechanical operation or the difference of specific gravity.

Description

[Detailed description of the invention] The present invention provides a liquid containing precious metals, especially in the form of powder or granules.
For example, the present invention relates to a method for extracting noble metals from a liquid containing noble metals by filtering a polishing liquid using a filtering device, recovering a filter medium to which precious metals are attached, and extracting precious metals from the filter medium.

For example, precious metal accessories made of gold, silver, etc. are often polished using a barrel polisher or the like during the manufacturing process. This type of polishing is performed using abrasive materials and water, so precious metals such as gold and silver are polished off in the form of powder or granules and mixed into the polishing liquid after this polishing process. are doing.

Conventionally, polishing liquids containing gold, silver, etc. have been discarded after treatment. However, as precious metals have become expensive as they are today, it is a big loss to dispose of them as is, and there are high hopes for their recovery and reuse.

The first object of the present invention is to meet such demands.

In addition, conventionally, such precious metal extraction (separation) equipment
Although not all of them, most of the above-mentioned precious metal polishers are small businesses; conventional expensive equipment is too burdensome and unsuitable for small businesses.

In view of these points, a second object of the present invention is to provide an inexpensive and simple method for extracting (separating) noble metals.

Therefore, the gist of the present invention is to provide a cylindrical filter in a filtration tank, divide the cylindrical filter into an upper chamber and a lower chamber, connect a large growth pipe and a liquid discharge pipe to the filtration tank, and The liquid flowing from the Taisei tube passes through the cylindrical filter from the cylindrical filter to the cassette and flows out from the liquid draining tube, and is filtered after a filter material is placed on the wall of the cylindrical filter in advance. After filtering the liquid mixed with precious metals using a filtration device made of 100% carbon dioxide, and allowing the precious metals to be lunarized into the filter medium, the cylindrical filter is taken out from the filtration device, and the lunarized filter medium is peeled off from the wall of the cylindrical filter. , a method for extracting precious metals from a liquid containing precious metals, characterized in that the lunar precious metals are extracted from the filter medium by a conventional method.

Examples of the present invention will be described in detail below.

Figures 1 and 2 show the filtration system used in the present invention.
1 An example of the device is shown. 1 is a filtration tank through which liquid such as sewage passes, and has a cylindrical shape with a closed bottom. The inside of this filtration tank 1 is divided into a royal chamber 3 and a lower chamber 4 by a partition plate 2. It is divided.

The partition plate 2 has an opening 5 in the center, which communicates the upper chamber 3 and the lower chamber 4. A cylindrical filter 6 is attached to the opening 5, as shown in FIG. The second part has an open lower part and the lower part has a bottom 8, and a flange body 9 is provided on the upper edge, and this flange body 9 is placed on the partition plate 2 and attached, and from the lower chamber 4 to the royal house 3. The liquid flowing through the opening 5 always passes through the cylindrical filter 6 and flows out into the upper chamber 3 from its open lower part. Said collar body 9 distance plate 2
It is preferable to interpose a sealing member 10 between them. Finally, a through hole 11 is opened in the bottom 8 of the cylindrical filter 6, a drain pipe 12 with a valve 13 is connected to the through hole 11, and the drain pipe 12 extends outside the filtration tank 1. put out

Reference numeral 14 denotes a large-forming pipe for forming a liquid such as sewage, which is connected to a lower position of the lower chamber 4 of the filtration tank 1, and the other end is connected to the liquid 17 in the liquid tank 16 to be filtered via a pump 15 in the middle. Contact.

A drainage pipe 18 and a pump 1 are installed in the middle of the main pipe.
A branch pipe 19 is provided at the portion 5, and the branch pipe 19 is connected to a filter medium tank 20. A liquid outlet pipe 21 is connected to the two bases 3 of the filtration tank 1, and the other end is connected to the liquid tank 16. The liquid output pipe 21 branches in the middle, and a branch pipe 22 thereof communicates with the filter medium tank 20.

23.24, 25, 26.27.28 are valves.

The top of the filtration tank 1 is closed by a lid 29 via a sealing member, and the lid 29 is removably attached by a screw 30 inserted into a tightening member 31.

Reference numeral 32 denotes a handle of the cylindrical filter 6, which is used when the cylindrical filter 6 is opened to open the lid 29 and taken out from the filtration tank 1, or when the cylindrical filter 6 is still attached. It is something to do.

In the filtration device, when the liquid is formed from the formation tube 14, the formed liquid is passed from the lower chamber 4 to the cylindrical filter ``''''6.
The liquid passes through the upper chamber 3, is filtered, moves to the upper chamber 3, and is discharged from the upper chamber 3 through the liquid outlet pipe 21, but is not washed, and paper, fiber materials, or any of these materials are left in the water in the filter medium tank 20. After melting and thoroughly mixing the filter medium made of the mixed material, the valves 13, 24, 25.
27 is closed, the other valves 23, 26, and 28 are opened, and the pump 15 sends the water mixed with the filter medium in the filter medium tank 20 without sifting, and the water enters the lower chamber 4 from the large growth pipe 14 and becomes cylindrical. The liquid passes through the filter 6 and is filtered, moves to the upper chamber 3, and circulates from the drain pipe 21 to the branch pipe 22 to the filter medium tank 20. At this time, the filter medium mixed into the water is distributed almost uniformly on the wall surface of the cylindrical filter 6. Follow the lunar calendar. After that, this time valves 13, 24, 26
．． 28 is closed, other valves 23, 25, and 27 are opened, and the liquid to be filtered, for example, the polishing liquid 17 after polishing, is sent by the pump 15, and the liquid 17 flows from the large tube 14 into the lower chamber 4. The liquid passes through the inlet cylindrical filter 6 and is filtered, and the filtered liquid moves to the upper chamber 3 and is circulated to the liquid tank 16 through the outlet liquid pipe 21. At this time, since the wall surface of the cylindrical filter 6 is covered with the adhering filter medium, the noble metals (particularly in the form of powder or granules) mixed in the processed polishing liquid are filtered and adhered to the filter medium.

Then, open the lid 29 and insert the cylindrical filter 6 into the filter tank 1.
It is taken out and filtered through the wall of the cylindrical filter 6 to scrape off and collect the filter material, especially powdery or granular precious metals adhering to it. To take out the cylindrical filter 6, loosen the screw 30, remove the lid 29 from the filtration tank 1, open the upper part of the filtration tank 1, lift it by the handle 32, and take it out from the opening.

The filter medium removed and collected from the cylindrical filter 6 is
If necessary, water is removed by drying treatment, etc., and precious metals and ash are obtained by a conventional method, for example, by incinerating the filter medium, and only the precious metals are separated and extracted by mechanical operation or a method using the difference in specific gravity. .

In the above-mentioned filtration device, if the filter material attached to the wall of the cylindrical filter 6 comes off when the cylindrical filter 6 is taken out, and it is inconvenient, the outer wall of the cylindrical filter 6 should be provided with an appropriate material to prevent it from collapsing. It is recommended to provide a protruding body for this purpose.

As described above, the present invention particularly involves filtering a liquid containing precious metals in the form of powder or granules, for example, a polishing liquid after polishing, using a filtering device to deposit the precious metals into a filter medium, and then treating the filter medium. Because it separates and extracts precious metals, anyone can easily perform the extraction process and reuse it, and the equipment is inexpensive, so the cost is low. For the separation and extraction process, you can take the collected filter media and have it done by a professional company. In this way, it can be easily recovered and reused without being discarded.

[Brief explanation of drawings]

The drawings show an example of a filtration device used in carrying out the present invention, with FIG. 1 being a central vertical sectional view thereof, and FIG. 2 being a partially sectional front view of a cylindrical filter. 1... Filter tank 6... Cylindrical filter 14
...Human liquid pipe 16...Liquid tank 20...Filtering medium tank
21... Drainage tube patent applicant Yoshio Kohara

Claims (1)

[Claims] A cylindrical filter is provided in the filtration tank, and the cylindrical filter divides the tank into an upper chamber and a royal chamber.A liquid inlet pipe and a liquid outlet pipe are connected to the filtration tank, and the liquid entering from the liquid inlet pipe is A filtration device is provided, in which the liquid passes through the cylindrical filter from the lower chamber to the upper chamber, and the liquid is discharged from the liquid discharge pipe, and the filter medium is attached to the wall of the cylindrical filter in advance and then filtered. After filtering the liquid mixed with precious metals and adhering the precious metals to the filter medium, the cylindrical filter is taken out from the filtration device, the filter medium adhering to the wall of the cylindrical filter is peeled off, and the liquid is removed from the inside of the filter medium. A method for extracting precious metals from a liquid containing precious metals, characterized by extracting the attached precious metals by a conventional method.