JP5160926B2 - Method of peeling gold leaf from gold leaf-attached product and method of collecting gold - Google Patents

Description

  The present invention relates to a method for recovering gold by peeling a gold foil from a discarded gold foil patch (a ritual instrument or figurine with a gold foil attached to the surface).

  In Japan, gold leaf has long been used to decorate various items such as furniture from shrines and temples, ritual tools such as Buddhist altars and shrines, various figurines, and lacquerware boxes. Since gold is an expensive and valuable resource, it is desirable to peel and collect the gold foil affixed to the surface and recycle it into a gold bullion when these gold foil affixed products are discarded. However, the gold leaf is very thin and the amount of gold collected is very small compared to the time and effort required to peel off, so the gold leaf patch that is no longer needed is discarded with the gold leaf attached. .

The present invention, in view of the fact the gold is a valuable resource, gold (gold) from gold foil patch products which are discarded economically recovered, as a problem to obtain a technical means which can be reproduced as gold bullion Yes.

The method for recovering gold from a gold foil patch according to the present invention is characterized by means for peeling the gold foil from the surface of the gold foil patch 5 and peels the gold foil from the surface of the gold foil patch 5 as small gold foil pieces dispersed in water. And a second step of separating the gold foil dispersed in water. In the first step, high-pressure air in which water-soluble powder is mixed is sprayed onto the gold-foil-bonded surface of the gold-foil-bonded product 5, and high-pressure water is mixed into the sprayed air and sprayed in the form of mist. The gold foil is made into fine pieces and peeled off by the impact when it collides with the gold foil application surface. The high-pressure water sprayed together with the water-soluble powder helps the water-soluble powder to collide with the gold foil application surface at a high speed, and prevents the peeled gold foil pieces from scattering into the air. The peeled gold foil pieces flow down while being dispersed in the sprayed water.

  A 2nd process is a process of isolate | separating a gold-foil piece from the water which flowed down. In this process, the filter 8 is used, and water and the powder melted therein pass through the filter 8, and the gold foil pieces dispersed in the water are captured by the filter 8. And can be separated from the powder. This 2nd process is good also as a process of isolate | separating a gold foil piece with a centrifuge. Since the adhesive is adhered to the separated gold foil pieces, these impurities are removed by purification to obtain gold bullion.

As the water-soluble powder, it is preferable to use sodium bicarbonate (sodium bicarbonate, sodium bicarbonate) powder. It has a relatively high specific gravity, an excellent peeling function, and is inexpensive. Soluble powder and high pressure water is ejected in a mixed state from one nozzle, to convey the soluble powder to the nozzle with compressed air, high pressure together with the compressed air containing water-soluble powder in the nozzle If water is jetted, the water-soluble powder can be transported to the nozzle and the water-soluble powder can be jetted at high speed.

The invention according to claim 1 of the present application is an invention of a gold foil peeling method, which is a first step of a method of recovering gold from the gold foil patch of the present application, and the gold foil patch of the gold foil patch 5 from the nozzle 24 of the nozzle 2. From the gold foil patch characterized by injecting high-pressure air mixed with water-soluble powder on the surface, mixing high-pressure water supplied from the peripheral edge of the injection port 24 into the air to be injected, and spraying it in the form of a mist This is a method for peeling gold leaf.

The method for recovering gold from the gold foil patch according to the invention of claim 2 of the present application, injects high-pressure air mixed with water-soluble powder from the injection port 24 of the nozzle 2 onto the gold foil paste surface of the gold foil patch 5 , The high-pressure water supplied from the periphery of the injection port 24 is mixed with the air to be jetted and jetted in the form of a mist . The water flowing down from the gold foil sticking surface is passed through the filter 8 and the peeled gold foil pieces captured by the filter are removed. It is the collection method of the gold | metal | money from a gold-foil sticking goods characterized by collecting.

  As the water-soluble powder in each of the above methods, as described above and in claims 3 and 4, sodium bicarbonate (sodium bicarbonate, sodium bicarbonate) powder in terms of mass, stability, non-toxicity, economy, etc. Is suitable.

  According to experiments conducted by the inventors of the present application, water-soluble powder (using baking soda) was transported to a nozzle with compressed air, and at the same time, high-pressure water was supplied to the nozzle and sprayed toward the gold foil application surface. As a result, the gold foil on the surface where the gold foil was applied could be removed easily and in a short time. The removed gold foil is dispersed in the sprayed water and flows down. On the other hand, the water-soluble powder injected with water melts in water. Therefore, the gold foil contained in the water can be captured and collected by filtering the water flowing down from the gold foil application surface with a filter.

  In the experiments conducted by the inventors, sodium bicarbonate was used, but it is considered that the same effect can be obtained by using a powder of a substance that has a specific gravity to some extent and easily melts in water. The specific gravity of the baking soda used in the experiment is 2.2, the Morse code is 2.5, and the particle size is 60 to 110 μm and (150 to 250 μm). It is considered that the use of the one having a larger particle size increases the size of the gold foil piece after peeling, and it becomes easier to separate the gold foil piece from the water in the second step. The pressure of the jet air is about 0.3 to 0.5 megapascal, and the pressure of the jet water is about 5 to 10 megapascal.

  According to the method of the present invention, the gold foil pieces peeled off from the gold foil sticking surface can be collected in a dispersed state in water without being scattered, so that it can be used outdoors, and the gold foil from a large gold foil sticking product can be used. Peeling can be done easily. Further, since the gold foil is peeled off by spraying powder, water, and air, it is possible to easily peel off and collect the gold foil stuck on the intricate surface of a Buddhist altar or figurine. In addition, the device necessary for carrying out the method of the present invention is a device for mixing and injecting powder, air, and water, and a separation device such as a filter or a centrifuge, which is relatively inexpensive, and the gold foil is peeled off. And the collection can be performed in a short time, and there is an effect that it is possible to economically collect the gold foil from various kinds of gold foil-attached products.

  Hereinafter, an example of a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing the method of the present invention. In the figure, 1 is an apparatus for injecting air, water and powder (hereinafter referred to as “mixed injection apparatus”), 2 is an injection nozzle, 3 is an air hose, 4 is a water hose, 5 is a gold-foiled product, and 6 is an injection nozzle. Cover for preventing scattering of powder and water sprayed from 2 (powder is trapped in water), 7 for receiving water flowing down from gold foil patch 5 and cover 6, 8 for filter, 9 for It is a drainage container.

  The mixed injection device 1 includes a compressor 11, an air flow path 12, a water-soluble powder hopper 13, a fixed amount supply device (screw conveyor) 15 for sending a predetermined amount of powder in the hopper to a powder supply pipe 14, and a water tank. 16, a water supply port 17 to the water tank 16, a high-pressure water pump 18, a suction water channel 19 that connects the water tank 16 and the high-pressure water pump 18, and a discharge water channel 22 that connects the high-pressure water pump 16 and the hose connection port 21. doing. The water supply port 17 in the figure is a water tap. The lower end of the powder supply pipe 14 opens into the air flow path 12. The air hose 3 connected to the air hose connection port 23 is connected to the rear end of the nozzle 2 (the end on the opposite side of the injection port 24), and the air containing the powder passes through the nozzle 2 linearly. It is injected from the injection port 24. Water in the water hose 4 is supplied from the peripheral edge of the nozzle outlet 24, mixed with the jet air, and jetted in a mist form.

The discharge pressure of the compressor 11 of the mixed injection device 1 used in the experiment is a maximum of 0.49 megapascals, the amount of air used is a maximum of 2.5 Nm ³ / min, the discharge pressure of the high-pressure water pump 18 is a maximum of 13.7 megapascals, the discharge The maximum amount of water is 10 liters / minute, and the nozzle inner diameter of the injection nozzle 2 is 8 mm.

  Using the above apparatus, powder of sodium hydrogen carbonate is put into the powder hopper 13, and the compressor 11, the high-pressure water pump 18, and the metering supply device 15 are operated and the mixed jet 25 injected from the nozzle 2 is used as the gold foil of the gold foil patch 5. Spray onto the sticking surface. The nozzle 2 is moved or the gold foil patch 5 is moved and rotated so that the mixed jet 25 hits the entire gold foil sticking surface. The gold foil is quickly removed from the surface where the mixed jet 25 is jetted, and the removed gold foil is dispersed in the water flowing down from the gold foil sticking surface and flows down to the water receiver 7. When the water that has flowed down passes through the filter 8, the gold foil dispersed in the water is captured and separated by the filter, and the water and sodium bicarbonate dissolved therein flow down to the drainage container 9.

  Since the size of the gold foil peeled off from the gold-foil-attached product 5 is not constant, it is preferable to use a filter 8 having the finest possible size. However, if a fine filter is used, the water passage resistance increases, so a large filtration area is required, and the gold foil captured by the filter 8 must be frequently collected. Preferably, a rotating belt type or rotating cylinder type filter is used to continuously peel and collect the gold foil captured by the filter from the filter surface.

Block diagram schematically showing the method of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mixed injection apparatus 2 Injection nozzle 5 Gold-foil sticking goods 8 Filter
11 Compressor
13 Water-soluble powder hopper
15 Metering device
18 High pressure water pump
25 mixing jets

Claims (4)

Injecting high-pressure air mixed with water-soluble powder onto the gold foil sticking surface from the injection port of the nozzle, and mixing the high-pressure water supplied from the periphery of the injection port into the sprayed air and spraying it in the form of a mist The peeling method of the gold foil from a gold foil sticking article. Injecting high-pressure air mixed with water-soluble powder onto the gold foil application surface from the nozzle injection port , mixing the high-pressure water supplied from the periphery of the injection port into the sprayed air, and spraying it in the form of a mist. A method for recovering gold from a gold foil-attached product, characterized in that the water flowing down from the sticking surface is passed through a filter and the separated gold foil pieces captured by the filter are collected. Water-soluble powder is a powder of sodium hydrogen carbonate, peeling method gilt claim 1. Water-soluble powder is a powder of sodium hydrogen carbonate, a method for recovering gold claim 2.

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