KR102767067B1 - Purification and regeneration of char through waste tire pyrolysis carbon black manufacturing system - Google Patents

Abstract

The present invention provides a system for purifying char and manufacturing regenerated carbon black through waste tire pyrolysis, which includes a raw material storage tank, a foreign material selection unit, a buffer tank, a crusher, a collection device, a carbon black powder storage tank, a molding device, a drying device, a cooling device, a selection device and a finished product storage device, so that when the work of manufacturing regenerated carbon black is continuous, the char is removed from the foreign matter contained in the char and crushed and collected into a desired size and transported through a sequential work process, and particularly, in the process of forming pellets by mixing carbon black and water, the production of a reliable and excellent product with a required size and strength is smoothly carried out by a mixing pin.
Accordingly, the production of regenerated carbon black can be carried out smoothly within a short period of time, which has the effect of increasing production efficiency, and in addition to high purity, it can be easily manufactured especially in the required size and strength, which has the effect of maximizing value, including the excellence and reliability of the finished product.

Description

Purification and regeneration of char through waste tire pyrolysis carbon black manufacturing system

The present invention relates to a method for manufacturing regenerated carbon black by refining char obtained through a pyrolysis process of waste tires, and more specifically, to a system for manufacturing regenerated carbon black by refining char through pyrolysis of waste tires, which removes foreign substances contained in the char, crushes and collects the char into a desired size, and transports the char while going through sequential work processes when the work for manufacturing regenerated carbon black is continuous, and in particular, enables the production of a reliable and excellent product with a required size and strength smoothly by a mixing pin in a process of mixing carbon black and water to form pellets.

Carbon black, which is generally used in tire manufacturing, is an essential additive that increases the bonding strength of rubber, the main component of tires, and requires a high purity of 99% or higher.

And thermal decomposition is a widely used method for recovering carbon black from waste tires.

However, the char obtained through the waste tire pyrolysis process has a purity of 78-82% due to other additives used in the manufacturing of the tire.

The main reason for the deterioration of the char obtained through the thermal decomposition process of waste tires is due to the residual volatile substances introduced during the thermal decomposition process and the inorganic additives used as additives. The main types of the inorganic additives include sulfur, zinc oxide (ZnO), magnesium oxide (MgO), silica (SiO2), calcium carbonate (CaCO3), and iron oxide (Fe2O3).

As described above, the patent documents for extracting or manufacturing carbon black through thermal decomposition of waste tires are as follows.

First, as disclosed in Republic of Korea Utility Model Publication No. 20-0409347 (hereinafter referred to as “Patent Document 1”), a technology has been proposed such as a waste tire pyrolysis and emulsification system comprising a pyrolysis reactor, a cyclone, a cooler, a condenser, an oil-water separator, a first oil tank, an evaporator, and a second oil tank, which extracts oil and carbon black from waste tire chips and recycles them while continuously supplying waste tire chips.

In addition, as published in Korean Patent Publication No. 10-1121569 (hereinafter referred to as “Patent Document 2”), a technology has been proposed for processing carbon black recovered from waste tires by pyrolysis of waste tires to improve the quality of the carbon black, which comprises a step of removing iron cores and fibers; a step of pulverizing; a step of removing volatile matter; a step of generating inorganic salts; a step of filtering and washing; and a step of coagulating inorganic salts.

Also, as published in Korean Patent Publication No. 10-1651618 (hereinafter referred to as “Patent Document 3”), a technology has been proposed for a purification method for upgrading waste tire pyrolysis carbon black, including the steps of slurrying waste tire pyrolysis carbon black to remove residual volatile substances, inorganic additives, ash, etc., and increase the carbon content of the carbon black and increase the surface area; the step of subjecting the pulverized product to flotation; the step of magnetic separation; the step of heat treatment; and the step of acid/base treatment after washing and filtering.

Also, as disclosed in Korean Patent Publication No. 10-2158753 (hereinafter referred to as “Patent Document 4”), a technology has been proposed for a system for manufacturing regenerated carbon blocks and refining char through waste tire pyrolysis, which comprises a raw material storage tank; a pretreatment unit; a primary drying unit; a crushing unit; a forming unit; a secondary drying unit; a vibrating screen; a packaging unit, and a return unit, so that the quality of regenerated carbon black obtained by refining char and forming it into a sphere can be maintained in a good state.

However, Patent Document 1 has the disadvantage of not being able to produce high purity carbon black, and in particular, of not being able to provide carbon black pellets of the required size and strength.

Patent Documents 2 and 3 were able to provide carbon black of a higher quality than Patent Document 1 to a certain extent, but they also have the disadvantage of not being able to provide carbon black pellets having the required size and strength.

Patent Document 4 was able to provide good quality carbon black along with the disadvantage of going through a complex work process, but it also has the disadvantage of not being able to provide carbon black pellets having the required size and strength when providing the final product.

Republic of Korea Utility Model Registration No. 20-0409347 Republic of Korea Patent Publication No. 10-1121569 Republic of Korea Patent Publication No. 10-1651618 Republic of Korea Patent Publication No. 10-2158753

The specific technical solution of the present invention for resolving the above-mentioned conventional problems is to provide a system for refining char and manufacturing regenerated carbon black through waste tire pyrolysis, which removes foreign substances contained in char, crushes and collects char into a desired size and transports it through sequential work processes when the work of manufacturing regenerated carbon black is continuous, and in particular, enables the production of a high-quality product with high reliability and strength required by a mixing pin in the process of mixing carbon black and water to form pellets.

Another specific technical solution of the present invention is to ensure that dust generated during each process of manufacturing regenerated carbon black can also be removed smoothly.

Another specific technical solution of the present invention is to enable the removal of foreign substances from char to be carried out precisely and the pulverization to be carried out precisely to a desired size.

Another specific technical solution of the present invention is to enable carbon black pellets to be smoothly formed into a required size and strength when forming them.

The specific technical solution of the present invention for solving the above-mentioned specific technical problem comprises: a raw material storage tank storing char obtained by pyrolysis of waste tires; a foreign matter selection unit sequentially selecting and removing foreign matters mixed in the char conveyed from the raw material storage tank by means of vibration, and then removing wires remaining in the char by means of magnetic force and then conveying them; a buffer tank storing the char selected and conveyed by the foreign matter selection unit and carbon black pellets dropped from the finished product; a crusher quantitatively charging the char conveyed from the buffer tank and crushing the char of irregular size into carbon black powder in the form of a powder of 10㎛ or less; a collecting device into which the carbon black powder finely crushed in the crusher is conveyed and collected; a carbon black powder storage tank storing the carbon black powder collected in the collecting device and conveyed by means of a blowing method together with discharge from the collecting device; The present invention comprises: a molding device which molds carbon black powder transferred from the carbon black powder storage tank into carbon black pellets of a required size and strength when water is added; a drying device which dries the carbon black pellets transferred from the molding device to lower the moisture content of the carbon black pellets; a cooling device which lowers the temperature increased in the drying device; a sorting device which supplies carbon black pellets of a size larger or smaller than a required size out of the carbon black pellets transferred through the cooling device back to the buffer tank and transports finished carbon black pellets sorted to a required size; and a finished product storage device which receives finished carbon black pellets transferred from the sorting device from the transfer device, stores them, and then discharges them so that they can be packaged.

It includes a bag filter connected to collect and remove various types of dust generated and discharged from the raw material storage tank, foreign matter selection unit, molding device, drying device, cooling device, drying device, and finished product storage device through each collection line and then discharge them.

The above-mentioned molding device includes a mixing unit having a drum formed with an inlet, a plurality of nozzles for supplying water, and an outlet, a rotating shaft rotated by a driving means on the drum, and a plurality of mixing pins mounted on the rotating shaft and arranged in a spiral shape to mix and transport the supplied carbon black powder and the supplied water by rotation and form carbon black pellets, wherein the plurality of mixing pins arranged in the mixing unit are formed with pointed ends that come into contact with the carbon black powder and water so as to minimize the contact area during the process of mixing the carbon black powder and water and to mix them by contact rather than kneading, and a portion mounted on the mixing unit is formed in the shape of a rod having the same diameter.

The pointed portion of the above plurality of mixing pins is formed in a cone shape with a length of less than half of the total length of the mixing pins.

The above mixing unit includes a mounting shaft tube that is detachably mounted by being inserted into the outer surface of the rotating shaft, each spiral hole formed so as to be spirally screwed onto the mounting shaft tube, and each mixing pin that is screwed into the spiral hole.

The present invention relates to a method for manufacturing regenerated carbon black, in which foreign substances contained in char are removed, crushed and collected into a desired size and transported through sequential work processes when the work of manufacturing regenerated carbon black is continuous, and in particular, in the process of mixing carbon black and water to form pellets, the manufacturing of excellent products with high reliability and strength with the required size and strength is smoothly carried out by a mixing pin, thereby enabling the manufacturing of regenerated carbon black to be smoothly carried out in a short period of time, thereby increasing production efficiency, and also maximizing the value, including the excellence and reliability of the finished product, as well as the high purity, by making it easy to manufacture with the required size and strength in particular.

In addition, it also has the effect of reducing air pollution by ensuring that dust generated during each process of manufacturing regenerated carbon black is removed smoothly.

In addition, by allowing the removal of foreign substances from the char to be carried out in detail and the crushing to be carried out precisely to the desired size, it has the effect of improving the formability of the finished product and further increasing the completeness of the finished product.

In addition, when forming carbon black pellets, it has the effect of ensuring excellent excellence and high reliability of the finished product by ensuring smooth forming to the required size and strength.

Figure 1 is a process diagram for explaining a system for manufacturing carbon black by purifying and regenerating char through waste tire pyrolysis, which is one embodiment of the present invention.
Fig. 2 is a cross-sectional view illustrating a molding device according to Fig. 1.
Figure 3 is an excerpt for explaining the rotation axis and mixing unit and mixing pin according to Figure 2.
Fig. 4 is a cross-sectional view showing the state of use of the molding device according to Fig. 2.
FIG. 5 is a photograph of a molded carbon black pellet, which is a finished product manufactured by the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings, but the present invention is not limited or restricted by the embodiments.

In addition, the terms or words used in the present invention described below should not be interpreted as limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that conform to the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best way.

Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

FIG. 1 is a process diagram for explaining a system for manufacturing carbon black by refining and regenerating char through waste tire pyrolysis, which is an embodiment of the present invention; FIG. 2 is a sectional view for explaining a molding device according to FIG. 1; FIG. 3 is an excerpt for explaining a rotating shaft, a mixing unit, and a mixing pin according to FIG. 2; FIG. 4 is a sectional view for explaining a state of use of the molding device according to FIG. 2; and FIG. 5 is a photograph of a molded carbon black pellet, which is a finished product manufactured by the present invention.

As described above, the process for manufacturing regenerated carbon black has been proposed in various forms other than those described in the patent documents that form the background of the invention, but it has the disadvantage of being difficult to ensure high purity and of not being able to provide carbon black pellets of the required size and strength.

The present invention provides a system for purifying char and manufacturing regenerated carbon black through waste tire pyrolysis, which enables the sequential work process of removing foreign substances contained in char, crushing and collecting to a desired size, and transporting the char, and particularly, in the process of forming pellets by mixing carbon black and water, to smoothly manufacture a product with high reliability and excellent size and strength required by a mixing pin.

The carbon black manufacturing system for purifying and regenerating char through waste tire pyrolysis according to the present invention has a specific technical configuration including a raw material storage tank (10), a foreign matter selection unit (20), a buffer tank (30), a crusher (40), a collection device (50), a carbon black powder storage tank (60), a molding device (70), a drying device (80), a cooling device (90), a selection device (100), and a finished product storage device (110).

The raw material storage tank (10) has a technical configuration in which only char is stored among oil, steel and char obtained through thermal decomposition of waste tires. It is preferable to apply a conventional silo or the like to the raw material storage tank (10), and in addition to the silo, a tank of a conventional structure capable of storing char is sufficient.

The foreign matter sorting unit (20) has a technical configuration in which foreign matters mixed in the char transferred from the raw material storage tank (10) are sequentially sorted and removed first by a vibration method such as a vibrating screen (22), and then the wires remaining in the char are removed by the magnetic force of a magnetic sorter (24), and then transferred. In the above, the transfer from the raw material storage tank to the vibrating screen, which is the foreign matter sorting unit, is smoothly transferred and supplied by a bin activator and a rotary feeder, which enable smooth transfer of the char by vibration, etc., at the bottom of the raw material storage tank.

The buffer tank (30) has a technical configuration for storing char that is selected and transported from the foreign matter selection unit (20) and carbon black pellets that are removed from the finished product. The char is transported from the foreign matter selection unit to the buffer tank by a screw conveyor.

In other words, the buffer tank serves to store char before being crushed in the crusher and also to store carbon black pellets that are not selected as finished products in the sorting device.

The crusher (40) quantitatively feeds char transported from the buffer tank (30) by a screw conveyor or the like and crushes char of irregular size into carbon black powder of 10㎛ or less in powder form.

In other words, the char obtained by pyrolysis is crushed into fine carbon black powder of 10㎛ or less in size through the crusher and then conveyed according to different sizes.

The capturing device (50) has a technical configuration in which finely ground carbon black powder from the crusher (40) is transferred and captured. It is preferable that the capturing device is a bag filter, which is a filtration dust collection device.

In addition, the carbon black powder collected by the screw conveyor provided at the bottom of the collecting device (50) is discharged.

The carbon black powder storage tank (60) has a technical configuration for storing carbon black powder captured in the capturing device (50) and transported by a blower together with discharge from the capturing device (50) by a screw conveyor. Transport from the capturing device to the carbon black powder storage tank is carried out by a roots blower and an ejector.

In the above, a bin activator and a rotary feeder, etc. are provided at the bottom of the carbon black powder storage tank to enable smooth transport of carbon black powder by vibration, etc., so that the supply to the molding device can be smoothly performed, and a metering screw conveyor is used to transport a fixed amount of carbon black powder to the molding device.

The molding device (70) is also called a pin mixer and is a key technical component in the present invention. It has a technical configuration that molds carbon black pellets of a required size and strength by adding carbon black powder and water transferred from the carbon black powder storage tank (60). The carbon black powder and water are added in a weight ratio of approximately 6:4.

The specific technical configuration of the molding device (70) includes an inlet (72) for feeding carbon black powder into the carbon black powder storage tank on one upper surface, a plurality of nozzles (72A) for supplying water, a drum (74) having an outlet (73) formed on the other lower surface opposite the inlet for feeding carbon black pellets, a rotating shaft (75) that is rotated by a driving means (not shown) on the drum (74), and a mixing unit (78) having a plurality of mixing pins (76) that are arranged in a spiral shape so as to mix and feed the fed carbon black powder and the supplied water by rotation and form carbon black pellets.

In particular, the plurality of mixing pins (76) arranged in the mixing unit (78) are formed with a pointed end that comes into contact with the carbon black powder and water so that the carbon black powder and water can be mixed by contact rather than kneading while minimizing the contact area during the process of mixing the carbon black powder and water, and it is preferable that the portion mounted on the mixing unit is formed in the shape of a rod with the same diameter.

In the above, the pointed portions of the plurality of mixing pins (76) are preferably formed in a cone shape with a length of less than half of the total length of the mixing pins (76) so that the carbon black powder and water can be mixed by contact rather than kneading while minimizing the contact area during the process of mixing the carbon black powder and water.

In other words, in the process of mixing carbon black powder and water, which is the core technology of the present invention, the part where the carbon black powder and water are mixed is shaped like a cone, which has a minimum contact area compared to a typical cylindrical shape during the process of mixing the carbon black powder and water, and since the carbon black powder and water are mixed and transported rather than kneaded, the forming into carbon black pellets can be smoothly achieved.

Furthermore, the carbon black powder supplied to the drum is transported while being mixed with water at a height of approximately 10 mm or less from the bottom surface of the drum, which provides conditions for even mixing while minimizing the contact area with the cone-shaped sharp part.

In addition, since the tip of the mixing pin is formed sharply, it also has the additional condition of preventing the molded product from getting caught between the carbon black powder and water mixed between the inner surface of the drum.

Here, the rotation speed of the rotation shaft is preferably approximately 400 to 600 rpm, and the formed carbon black pellets are also formed to a size of approximately 3 to 5 mm in proportion to the rotation speed. The formed carbon black pellets are proportional to the rotation speed, and when the rotation speed is 400 rpm or less, the carbon black pellets are formed to be large, and when the rotation speed is 600 rpm or more, the carbon black pellets are formed to be small.

In addition, the above-mentioned molded carbon black pellets also have a condition in which they can be easily crushed even with an average force of ~35 g (34 cN) and an individual force of <50 g (49 cN) as they are molded while the carbon black powder and water are evenly mixed, rather than having high hardness.

The above-mentioned carbon black pellet size and crushing conditions are specifications presented by Michelin and Bridgestone, global companies with high demand for molded carbon black pellets.

Accordingly, the carbon black pellets formed by the forming device are rotated under the above conditions, and in particular, the carbon black powder and water are mixed and transported, and the contact area is minimized due to the geometric characteristics of the mixing pin during the forming process, thereby mixing the carbon black powder and water, so that the pellets can be formed into pellets of the required size and relatively low hardness.

The mixing unit (78) includes a mounting shaft tube (78A) that is inserted into the outer surface of the rotating shaft () and detachably mounted by a bolt or the like, each spiral hole (78B) formed so as to be spirally screwed onto the mounting shaft tube (78A), and each mixing pin (76) that is screwed into the spiral hole (78B).

In other words, the mixing unit is preferably screw-connected to a spiral hole formed in the mounting shaft tube so that, in the process of forming carbon black pellets, when an abnormality, such as wear, occurs in the mixing pin, the abnormal mixing pin can be replaced on the mounting shaft tube.

In addition, the mixing unit, which is the mounting shaft, is provided so that it can be separated from the rotating shaft by a bolt or the like, so that in the event of a problem with the mixing unit, the mixing unit can be quickly replaced, thereby preventing a long delay in the carbon black pellet molding operation.

Accordingly, the molding device of the present invention can smoothly mold excellent and highly reliable carbon black pellets having the required size and hardness through the above-mentioned technical configuration.

The drying device (80) has a technical configuration for drying carbon black pellets transferred and fed from the molding device (70) to reduce the moisture content.

The above-mentioned drying device (80) is a rotary kiln dryer equipped with a turbo fan and a burner, etc., which rotates and transports the input carbon black pellets, and dries them from a moisture content of 40% to a moisture content of 1 to 2% through dehydration and drying. The drying temperature in the drying device is approximately 250 to 350°C, and the carbon black pellets are maintained at a moisture content of 1 to 2%.

In other words, carbon black powder and water are mixed in the molding device and molded into carbon black pellets, which have a high moisture content of approximately 40%, and then dried in a drying device to have a moisture content of approximately 1 to 2%.

The cooling device (90) has a technical configuration that lowers the increased temperature of the carbon black pellets resulting from drying in the drying device (80).

The above-mentioned cooling device (90) is a rotary kiln cooler, and is equipped with a cooling jacket, etc. on the outer surface of the drum, and cools the carbon black pellets of the increased temperature that are fed in to an appropriate temperature by supplying cooling air, etc. Cooling in the above-mentioned cooling device is performed to approximately 40 to 60°C, which is a temperature that does not cause burns when a worker touches it.

The sorting device (100) has a technical configuration that supplies carbon black pellets larger or smaller than the required size from the carbon black pellets transported through the cooling device (90) back to the buffer tank (30) and transports finished carbon black pellets sorted to the required size. The sorting device sorts by vibration using a two-stage vibrating screen.

In other words, the above-mentioned sorting device re-transfers and supplies carbon black pellets that are larger or smaller than the required size among the carbon black pellets formed in the molding device to the buffer tank by a roots blower and an ejector, and transports the finished carbon black pellets that are sorted to the required size to a finished product storage device.

The finished product storage device (110) has a technical configuration that receives finished product carbon black pellets transferred from the sorting device (100) from a transfer device (112) such as a bucket elevator, stores them in a packing buffer tank, and then discharges them so that they can be packaged in small packages or sacks using a packing device (packing machine, 114).

Accordingly, the present invention provides conditions in which, if the work of manufacturing regenerated carbon black, i.e. carbon black pellets, is continuous, foreign substances contained in the char are removed and crushed and captured into a desired size and transported through sequential work processes, and in particular, in the process of mixing carbon black and water to form pellets, the manufacturing of a reliable and excellent product with the required size and strength can be smoothly carried out by a mixing pin.

In addition, when manufacturing is not done in the required size during sorting, it is possible to minimize the loss of raw materials by allowing them to be recycled.

Meanwhile, it is preferable to connect to a bag filter (120) that collects and removes various types of dust generated and discharged from the raw material storage tank (10), foreign material selection unit (20), molding device (70), drying device (80), cooling device (90), and finished product storage device (110) through each collection line and then discharges them. It is also preferable to connect a packaging device (114) to the bag filter ().

It also creates conditions that can minimize air pollution.

10: Raw material storage tank 20: Foreign matter sorting section
22: Vibrating screen 24: Magnetic separator
30: Buffer tank 40: Crusher
50: Capture device 60: Carbon black powder storage tank
70: Molding device 72: Inlet
72A : Nozzle 73 : Outlet
74 : Drum 75 : Rotating shaft
76: Mixing pin 78: Mixing unit
78A: Mounting shaft 78B: Spiral hole
80: Drying device 90: Cooling device
100: Sorting device 110: Finished product storage device
112: Transport device 114: Packaging device

Claims (5)

A raw material storage tank in which char obtained through thermal decomposition of waste tires is stored;
A foreign matter sorting unit that sequentially selects and removes foreign matters mixed in the char transferred from the above raw material storage tank by means of vibration, and then removes the wire remaining in the char by means of magnetic force and then transports it;
A buffer tank for storing chars selected and transported from the above foreign matter sorting section and carbon black pellets dropped from finished products; A crusher for quantitatively feeding chars transported from the above buffer tank and crushing chars of irregular size into carbon black powder in the form of powder of 10㎛ or less;
A collecting device in which finely ground carbon black powder from the above crusher is transported and collected;
A carbon black powder storage tank that stores carbon black powder captured in the above capturing device and transported by a blower together with discharge from the capturing device;
A molding device that molds carbon black powder and water transferred from the carbon black powder storage tank into carbon black pellets of the required size and strength;
A drying device for drying carbon black pellets transported from the above molding device to reduce their moisture content;
A cooling device that lowers the elevated temperature of the carbon black pellets in the above drying device to 40 to 60°C, which is a level that prevents burns when touched by workers;
A sorting device that re-supplies carbon black pellets of a size larger or smaller than the required size from the carbon black pellets transported through the above cooling device to the buffer tank and transports finished carbon black pellets of a size selected to the required size; and
A finished product storage device that receives finished product carbon black pellets transported from the above sorting device from the transport device, stores them, and then discharges them so that they can be packaged; including:
The above molding device,
A mixing unit comprising a drum in which an inlet, a plurality of nozzles for supplying water, and an outlet are formed, a rotating shaft that is rotated by a driving means in the drum, and a plurality of mixing pins mounted on the rotating shaft and arranged in a spiral shape to mix and transport the supplied carbon black powder and the supplied water by rotation and form them into carbon black pellets, wherein the plurality of mixing pins arranged in the mixing unit are formed with pointed ends that come into contact with the carbon black powder and the water so that the carbon black powder and the water can be mixed by contact rather than kneading while minimizing the contact area during the mixing process, and a portion mounted on the mixing unit is formed in the shape of a rod with the same diameter,
A system for purifying and regenerating carbon black through waste tire pyrolysis, wherein the pointed portions of the plurality of mixing pins are formed in a cone shape with a length of less than half of the total length of the mixing pins.
In the first paragraph,
A system for manufacturing carbon black by purifying and regenerating char through waste tire pyrolysis, including a bag filter connected to the system for collecting and removing various types of dust generated and discharged from the raw material storage tank, foreign material selection unit, molding device, drying device, cooling device, drying device, and finished product storage device through each collection line and then discharging the collected dust.
delete delete In the first paragraph,
A system for refining and regenerating carbon black through waste tire pyrolysis, wherein the mixing unit comprises a mounting shaft tube that is detachably mounted by being inserted into the outer surface of a rotating shaft, each spiral hole formed so as to be capable of being screwed into a spiral shape on the mounting shaft tube, and each mixing pin that is screwed into the spiral hole.

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