KR20240107039A - Shredding method and shredding device for stable shredding of small waste electrical and electronic products - Google Patents

Abstract

The present invention relates to a shredding method and shredding device that can stably shred small waste electrical and electronic products containing secondary batteries while controlling the risk of fire and explosion and removing hydrofluoric acid contained in the waste products. The method of shredding waste electrical and electronic products of the present invention shreds any one of secondary batteries and rechargeable and non-rechargeable small electric and electronic products containing secondary batteries under conditions that can control the risk of fire and explosion. It includes spraying brine containing any one of MgCl ₂ , CaCl ₂ , and BaCl ₂ salts. The present invention can significantly increase the efficiency of the entire process of dismantling waste electrical and electronic products and recover useful materials, and increase the safety of the shredded products, so it can be used in the field of recycling of waste electrical and electronic products, including secondary batteries, using existing methods and methods. It can be widely used as a replacement for the device.

Description

Shredding method and shredding device for stable shredding of small waste electrical and electronic products {Shredding method and shredding device for stable shredding of small waste electrical and electronic products}

The present invention relates to a shredding method for stable shredding of small waste electrical and electronic products and a shredding device for the same. In particular, the present invention relates to a shredding method for stable shredding of small waste electrical and electronic products, and in particular, to a shredding device for the same, controlling the risk of fire and explosion, removing hydrofluoric acid contained in waste products, and small waste electrical and electronic products containing secondary batteries. This relates to a shredding method and shredding device that can reliably shred electronic products.

The size of the global home appliance market is increasing every year, and in particular, rechargeable and non-rechargeable small home appliances are predicted to grow by 2.5% annually until 2030. Accordingly, the development of effective treatment processes and methods for waste resources that will continue to increase in the future is required.

In general, the pretreatment process for lithium-ion waste batteries, including waste batteries from automobiles, largely goes through the following steps: physical disassembly (manual work) - residual value assessment - classification - waste battery discharge (deactivation), and then is put into the shredding process. In the case of small electronic devices, because they are relatively very small, manual work has a negative impact on throughput and reduces the efficiency of the overall process. However, if dismantling and deactivation steps are not taken when dismantling and deactivating rechargeable small waste electronic devices containing secondary batteries, there is a risk of fire or explosion when shredding them.

And these waste electrical and electronic products contain hydrofluoric acid (HF), which is a highly corrosive and highly soluble toxic substance that can cause immediate and permanent damage if it comes into contact with the human body. It also contains moisture and hydrogen. It is a powerful, acutely toxic substance that penetrates into the bones as it binds, causing a situation where parts of the body must be amputated.

Therefore, there is a need to develop a stable shredding method that can remove hydrofluoric acid contained in waste electrical and electronic products while controlling the risk of fire and explosion without going through the steps of dismantling and deactivating waste electrical and electronic products.

In Patent Publication No. 10-2022-0072276, a chamber capable of controlling atmospheric gas; a sample supply unit located within the chamber and supplying a sample; a crushing unit located within the chamber and crushing the supplied sample; A classification unit located below the crushing unit and classifying the crushed sample; and a recovery unit located below the classification unit, detachable from the classification unit, and recovering the classified sample. A crushing device capable of atmosphere control and classification and a crushing method using the same are provided.

In Patent Publication No. 10-2022-0135249, processing a battery with a size-reduced feed stream; and then recovery of the copper product, cobalt, nickel and/or manganese product and lithium product through a series of separation, isolation and/or leaching steps; and enabling recovery of any of the iron products, aluminum products, graphite products, etc. Methods, devices, and systems are provided for recovering and recycling materials from rechargeable lithium ion batteries.

Including the above patents, many technologies have been developed in relation to methods and devices for shredding waste electrical and electronic products containing secondary batteries and recovering useful substances from them. However, no technology has yet been disclosed to reliably shred waste electronic products containing secondary batteries by sufficiently controlling the risk of fire or explosion without going through dismantling and deactivation steps. In addition, the technology for shredding waste electronic products while simultaneously discharging hydrofluoric acid has not been disclosed. There has also been no proper disclosure regarding removal technology.

Republic of Korea Patent Publication No. 10-2022-0072276 Republic of Korea Patent Publication No. 10-2022-0135249

The purpose of the present invention is to provide a shredding method and a shredding device for stable shredding of small waste electrical and electronic products.

In particular, the present invention provides a shredding method that can control the risk of fire and explosion of small waste electrical and electronic products without going through the steps of dismantling and deactivating them, and can stably shred while removing hydrofluoric acid contained in the products. The purpose is to

In order to achieve the above object, in the present invention,

Secondary batteries and rechargeable and non-rechargeable small electrical and electronic products containing secondary batteries shall be shredded under any of the conditions a) to c) below that can control the risk of fire and explosion, and MgCl ₂ at the time of shredding. , CaCl ₂ , and BaCl ₂ It provides a method of shredding waste electrical and electronic products, which includes shredding while spraying salt water containing any one of the salts.

a) Nitrogen atmosphere conditions of more than 95%

b) Nitrogen atmosphere conditions of 80% to less than 95%

c) Carbon dioxide atmosphere conditions of more than 10%

In the crushing method, preferably, the brine contains 0.5 to 2% by weight of the salt and may be sprayed at 0.3 to 1.9 L/min.

In the above crushing method, preferably, the concentration of brine required for hydrofluoric acid removal can be calculated from the content of hydrofluoric acid detected in the crushing product after crushing the waste electrical/electronic product by spraying water on it.

In a preferred embodiment, the shredding method can shred secondary batteries or small rechargeable electrical/electronic products containing secondary batteries without dismantling or deactivating them.

The crushing method can be performed using a predetermined crushing device. In a preferred embodiment, the crushing device is,

An inlet formed in an open and closed manner,

A fluid spray unit installed in the inlet and provided with a spray nozzle for spraying water or salt water into the inlet.

A crushing unit provided with a crushing blade for crushing the sample supplied through the inlet,

A gas injection unit installed in the crushing unit to inject an inert gas,

It includes a crusher provided with a discharge unit that discharges the crushing products crushed in the crushing unit.

In a preferred embodiment, the inlet is provided with a transparent cover that can be opened and closed so that the crushing situation inside the crusher can be visually observed or photographed with a camera.

According to the shredding method and shredding device of the present invention, small waste electrical and electronic products including secondary batteries can be shredded stably while preventing fire and explosion, and at the same time, hydrofluoric acid contained in waste electronic products can be removed during the shredding process. By removing the hydrofluoric acid, hydrofluoric acid can be removed efficiently to the extent that the crushing product does not contain substantially hydrofluoric acid.

In addition, the crushing method and crushing device of the present invention can stably crush waste electrical and electronic products containing secondary batteries by preventing fire or explosion without going through disassembly and deactivation steps.

According to the present invention, it is possible to obtain safe shredded products that do not contain hydrofluoric acid by shredding small waste electrical and electronic products, and the safety of the shredding process can be improved while greatly increasing the efficiency of the overall process.

1 is a crushing device according to an embodiment of the present invention.
Figures 2a and b are photographs during crushing under atmospheric conditions, and c is a photograph of the crushing product under atmospheric conditions.
Figures 3a to 3c are photographs showing the experimental process during crushing at a nitrogen partial pressure of 85%.
Figures 4a to 4c are photographs showing the experimental process during crushing at 90% nitrogen partial pressure.
Figures 5a to 5c are photographs showing the experimental process during crushing at 95% nitrogen partial pressure.
Figures 6a to 6c are photographs showing the experimental process during crushing at a carbon dioxide partial pressure of 10%.
Figures a to c in Figure 7 are photographs showing the experimental process during crushing at a carbon dioxide partial pressure of 20%.
Figures 8 a to c are photographs showing the experimental process during crushing at a carbon dioxide partial pressure of 30%.
Figure 9 is a photograph of crushed products crushed under each condition.
Figures 10a to 10c are photographs showing the crushing process in the air.
Figures 11a to 11c are photographs showing the nitrogen atmosphere crushing process.

Terms or words used in this specification and claims should not be construed as limited to their common or dictionary meanings, and the inventor may appropriately define the concept of terms in order to explain his or her invention in the best way. It should be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it is.

The present invention relates to a shredding method and a shredding device used for stably shredding small waste electrical and electronic products containing secondary batteries by controlling the risk of fire and explosion while simultaneously removing hydrofluoric acid contained in the waste products. Hereinafter, the present invention will be described in more detail with reference to preferred embodiments and the accompanying drawings.

The method of shredding waste electrical and electronic products of the present invention shreds any one of secondary batteries and rechargeable and non-rechargeable small electric and electronic products containing secondary batteries under conditions that can control the risk of fire and explosion. It includes spraying brine containing any one of MgCl ₂ , CaCl ₂ , and BaCl ₂ salts.

When brine containing salts such as MgCl ₂ , CaCl ₂ , and BaCl ₂ is sprayed, the hydrofluoric acid contained in waste electrical and electronic products is removed by forming precipitates in the form of BaF ₂ , MgF ₂ , CaF ₂ , etc.

Preferably, the concentration of brine required to remove hydrofluoric acid can be calculated from the content of hydrofluoric acid detected when waste electrical and electronic products are shredded by spraying water on them. When so calculated, in the case of general small waste electrical and electronic products such as handheld vacuum cleaners and robot vacuum cleaners, the brine may preferably contain salt at 0.5 to 2% by weight, and more preferably include salt at 0.7 to 1.7% by weight. can do. At this time, the salt water may be preferably sprayed at 0.3 to 1.9 L/min, and more preferably at 0.7 to 1.5 L/min.

In a preferred embodiment, the brine may contain MgCl ₂ at a concentration of 0.0759% by weight or more, CaCl ₂ at a concentration of 0.0885% by weight or more, and BaCl ₂ at a concentration of 0.1661% by weight or more. More preferably, MgCl ₂ may be present at a concentration of 0.0759 to 0.0759% by weight. It may be included at a concentration of 0.18% by weight, CaCl ₂ at a concentration of 0.0885 to 0.20% by weight, and BaCl ₂ at a concentration of 0.1661 to 0.35% by weight.

The shredded products of waste electrical and electronic products obtained by this shredding method do not contain substantially hydrofluoric acid. Here, “substantially free of hydrofluoric acid” means that it does not contain hydrofluoric acid above the detection limit in general test methods for detecting hydrofluoric acid, such as the KS method. In an example of the present invention, when hydrofluoric acid was detected using the KS M 0035 method, the detection limit was 0.5 ppm (mg/L), but hydrofluoric acid was not detected in all test sections according to the method of the present invention.

The conditions that can control the risk of fire and explosion are any of a) to c) below.

a) Nitrogen atmosphere conditions of more than 95%

b) Nitrogen atmosphere conditions of 80% to less than 95%

c) Carbon dioxide atmosphere conditions of more than 10%

Under these conditions where the risk of fire and explosion is controlled, waste electrical and electronic products can be shredded without going through dismantling or deactivation steps. In general, salt water is sprayed at the same concentration as described above, but it is also possible to vary the concentration of salt water sprayed depending on atmospheric conditions. In conditions a) and c), where the risk of fire is relatively low, it is possible to reduce the amount of salt water sprayed and increase the concentration of salt water, and in conditions b), where the risk of fire is relatively high, it is possible to increase the amount of salt water and lower the concentration. possible. However, in any case, it is desirable to maintain the total amount of salt sprayed through the brine at the same level for hydrofluoric acid removal.

Electrical and electronic products to which the shredding method of the present invention is applied include, in particular, lithium-ion batteries, robot vacuum cleaners/handy vacuum cleaners/Al speakers/Bluetooth speakers/wireless earphones/wireless fans containing lithium-ion batteries. However, it is not limited to this, and can be applied to any small electrical or electronic product containing a secondary battery. In this case, 'small' means having a size that can be put into a crusher without separate crushing pretreatment.

In a preferred embodiment, the crushing method may be performed using a predetermined crushing device. This crushing device is preferably,

An inlet formed in an open and closed manner;

a fluid spray unit installed in the inlet and provided with a spray nozzle for spraying salt water into the inlet;

a crushing unit provided with a crushing blade for crushing the sample supplied through the inlet;

a gas injection unit installed in the crushing unit to inject an inert gas;

It includes a crusher provided with a discharge unit that discharges the crushing products crushed in the crushing unit.

1 is a crushing device according to a preferred embodiment of the present invention. The crushing device includes a crusher (1), which includes an opening and closing inlet (20), a crushing unit (40) provided with a crushing blade for crushing the sample supplied through the inlet, and the crushing unit (40). It includes a discharge unit 50 that discharges the crushed product.

A fluid jet unit 30 equipped with a spray nozzle for spraying water or salt water into the inlet 20 is installed, and water or salt water is sprayed into the crusher as needed during crushing. The fluid ejection unit 30 is connected to the water (or salt water) tank 3 outside the crusher through a pipe (P).

A gas injection part for injecting an inert gas is installed in the crushing unit 40 to form a predetermined gas atmosphere set as needed during crushing. The gas injection part is connected to the inert gas cylinder (2) outside the shredder and a pipe (L). Figure 1 shows one inert gas cylinder, but if necessary, two or more inert gas cylinders are connected to the gas injection section to inject each inert gas (for example, nitrogen and carbon dioxide) into the shredding section ( 40) It can be supplied within 40). The injection amount of inert gas can be controlled through a regulator provided in the cylinder.

Preferably, the inlet is provided with a transparent cover 10 that can be opened and closed so that the crushing situation inside the crusher can be observed with the naked eye or photographed with a camera. Although it is not limited, for example, a transparent acrylic plate can be used as a material for the transparent cover.

The shredding device of the present invention can be used to shred secondary batteries and rechargeable and non-rechargeable small waste electrical and electronic products containing secondary batteries. The crushing process according to a preferred embodiment is described as follows.

First, small waste electrical and electronic products ('samples') such as secondary batteries are supplied through the opening/closing inlet (20). The sample supplied through the inlet is transferred to the crushing unit 40 and crushed by the crushing blade. At this time, nitrogen or carbon dioxide is supplied from the gas injection unit to the crushing unit according to the set conditions, forming a gas atmosphere under the set conditions. Additionally, water or salt water may be sprayed into the crusher from the fluid ejection unit 30 according to set conditions.

The shredded product shredded in the shredding unit 40 is discharged through the discharge part 50 and collected in the shredded product collection unit 4.

The present invention will be described in more detail below through specific examples. These examples are illustrative of the present invention, and the scope of the present invention is not limited thereto.

<Example 1>

Secondary battery crushing experiment

An experiment was conducted to set crushing conditions to prevent stable explosion and fire of secondary batteries.

A shredding experiment was conducted using the secondary battery obtained after dismantling small waste home appliances using a small experimental shredder configured as shown in FIG. 1 as a sample.

The crushing conditions were 1) atmospheric conditions, 2) an inert gas atmosphere using nitrogen, and 3) an inert gas atmosphere using carbon dioxide. In the inert gas atmosphere, the fracture patterns according to various partial pressures of nitrogen and carbon dioxide were confirmed. The nitrogen atmosphere was conducted under conditions of nitrogen partial pressure of 85, 90, and 95%. The carbon dioxide atmosphere was conducted under conditions of carbon dioxide partial pressure of 10, 20, and 30%.

The experiment was conducted by recording video while crushing was in progress through a transparent acrylic plate cover provided at the top of the crusher.

1) Crushing atmospheric conditions

Crushing in atmospheric conditions resulted in sparks as shown in Figure 2 a and b. c is a photo of the crushing product.

As a result of crushing in air without injection of inert gas or spraying of salt water (or water), sparks were confirmed to occur during crushing. Initially, strong sparks were generated, and relatively smaller sparks compared to the initial ones continued to be generated for about 30 seconds. No fire occurred in the shredded secondary battery.

In this example, the shredding experiment was conducted on a small amount of secondary batteries and ended with the generation of sparks. However, it was determined that shredding a large amount of batteries could potentially lead to an explosion or fire.

2) Nitrogen atmosphere crushing

No sparks occurred during shredding at 85% nitrogen partial pressure, but a fire broke out in the collection box after shredding was completed. Figures 3a to 3c are photographs showing the experimental process during crushing at a nitrogen partial pressure of 85%.

No sparks occurred during shredding at 90% nitrogen partial pressure, but a fire broke out in the collection box after shredding was completed. Figures 4a to 4c are photographs showing the experimental process during crushing at a nitrogen partial pressure of 90%.

No sparks occurred during shredding at 95% nitrogen partial pressure, and no fire occurred in the collection box after shredding was completed. Figures 5a to 5c are photographs showing the experimental process during crushing at 95% nitrogen partial pressure.

3) Carbon dioxide atmosphere destruction

No sparks occurred during crushing at a carbon dioxide partial pressure of 10%, and no fire occurred in the collection box after crushing was completed. Figures 6a to 6c are photographs showing the experimental process during crushing at a carbon dioxide partial pressure of 10%.

No sparks occurred during crushing at a carbon dioxide partial pressure of 20%, and no fire occurred in the collection box after crushing was completed. Figures a to c in Figure 7 are photographs showing the experimental process during crushing at a carbon dioxide partial pressure of 20%.

No sparks occurred during crushing at a carbon dioxide partial pressure of 30%, and no fire occurred in the collection box after crushing was completed. Figures 8a to 8c are photographs showing the experimental process during crushing at a carbon dioxide partial pressure of 30%.

Figure 9 is a photograph of crushed products crushed under each condition as above.

The above experimental results are summarized and shown in Table 1.

atmosphere item spark fire significant atmosphere O X sparks for a long time Nitrogen 85% X O Fire occurs due to shredding products Nitrogen 90% X O Fire occurs due to shredding products Nitrogen 95% X X - carbon dioxide 10% X X - CO2 20% X X - carbon dioxide 30% X X -

It was believed that the reason why no fire occurred in the crushing products during atmospheric crushing was due to the difference in environmental conditions such as humidity and temperature due to the different test dates for atmospheric crushing and nitrogen atmosphere crushing.

Stable crushing was confirmed at 95% partial pressure in a nitrogen atmosphere.

In the case of carbon dioxide, unlike nitrogen, its content in the air is rare, so its partial pressure was formed at a significantly lower level than that of nitrogen (about 80% of nitrogen in the air). It was confirmed that carbon dioxide atmosphere crushing is capable of stable crushing at partial pressures of 10%, 20%, and 30%.

<Example 2>

small type discarded home appliances crushing experiment

An experiment was conducted to shred small waste home appliances using an industrial shredder.

Crushing was performed twice, divided into air crushing and nitrogen spray crushing. A shredding experiment was conducted on approximately 160 kg of waste small electrical and electronic products. The sample was introduced into the crusher through a conveyor belt. For safety in the event of a fire, a fire extinguisher and CO ₂ spray were provided and the experiment was conducted.

Figures 10a to 10c are photographs showing the crushing process in the air. When shredding in the air, no sparks or fire occurred at the shredding blades inside the shredder. However, after completion of shredding, a fire broke out in the shredding product collection box. The fire was immediately extinguished with a fire extinguisher and _CO2 spray, but the fire reoccurred. No fire occurred after the fire was re-extinguished.

Figures 11a to 11c are photographs showing the nitrogen atmosphere crushing process. Crushing was carried out by spraying nitrogen on the crushing blade portion, and during crushing, no sparks or fire occurred on the crushing blade portion inside the crusher. Additionally, there were no fires in the shredded products. After the end of crushing, the crushing products were observed for about 30 minutes, but no fire occurred.

The experimental results are summarized and shown in Table 2.

atmosphere item spark fire significant atmosphere X O Two fires occurred in shredded products nitrogen atmosphere X X -

<Example 3>

Hydrofluoric acid content analysis experiment for crushing products

Using a small experimental shredder having the configuration shown in Figure 1, one small waste home appliance (handheld vacuum cleaner, robot vacuum cleaner) (about 2 to 3 kg) was shredded while spraying water, barium chloride aqueous solution, and magnesium chloride aqueous solution, respectively. The HF content of the crushed product obtained after crushing was analyzed. The experimental conditions are as shown in Table 1 below, and the experimental results are as shown in Table 2 below. HF detection analysis was conducted by requesting the SL Safety Technology Institute (KOLAS certification agency).

division detail Experimental conditions - Experimental raw materials: Small waste electrical and electronic products for each experiment (handy type, robot vacuum cleaner)
1 unit (approximately 2~3kg)
- Crushing conditions: Water, salt water 1L/min spray
- Salt water used: BaCl, MgCl solution
- Purpose of experiment: Investigation of HF (hydrofluoric acid) behavior in crushed products, setting minimum brine concentration water spray - Shredding 1 small waste electrical/electronic product (handy type, robot vacuum cleaner) (approximately 2~3kg)
- Water 1L/min spray
- HF (hydrofluoric acid) concentration in the crushing product solution: 303ppm BaCl
salt spray - Shredding 1 small waste electrical/electronic product (handy type, robot vacuum cleaner) (approximately 2~3kg)
- BaCl brine 1L/min injection
- HF (hydrofluoric acid) concentration in the crushing product solution: Not detected MgCl
salt spray - Shredding 1 small waste electrical/electronic product (handy type, robot vacuum cleaner) (approximately 2~3kg)
- BaCl brine 1L/min injection
- HF (hydrofluoric acid) concentration in the crushing product solution: Not detected

The salt water concentration (based on 1L) required for HF removal was calculated from the water injection experiment results.

Calculation of F content (molar amount) based on 1L of water

Calculate the molar amount of F since F in HF reacts with Mg, Ba, and Ca (BaF ₂ , MgF ₂ , CaF ₂ )

→ (303ppm)×(1L)×0.001 / (18.9984g/mol) = 0.01595mol (F molar mass: 18.9984g/mol)

From this, the amounts of MgCl ₂ , CaCl ₂ , and BaCl ₂ required for precipitation were calculated.

MgCl ₂ : (24.305g/mol)×(0.0079744mol)+(35.453g/mol)×(0.01595mol) = 0.7593g

CaCl ₂ : (40.078g/mol)×(0.0079744mol)+(35.453g/mol)×(0.01595mol) = 0.8851g

BaCl ₂ : (137.33g/mol)×(0.0079744mol)+(35.453g/mol)×(0.01595mol) = 1.661g

Therefore, based on the handheld vacuum cleaner and robot vacuum cleaner used in the experiment, when spraying at 1L/min, the minimum salt water concentration required to remove fluoride is as follows.

MgCl ₂ minimum 0.7593g/L (0.07593wt%),

CaCl ₂ minimum 0.8851g/L (0.08851wt%),

BaCl ₂ minimum 1.661g/L (0.1661wt%) solution spray required

→ Requires the use of approximately 0.7 to 1.7% by weight of brine (there are differences depending on the type of precipitant)

The crushing method and crushing device of the present invention can stably crush waste electrical and electronic products containing secondary batteries by preventing fire or explosion without going through disassembly and deactivation steps, and provide safe crushing that does not contain hydrofluoric acid. product can be obtained. Accordingly, the present invention can significantly increase the efficiency of the entire process of dismantling waste electrical and electronic products and recover useful materials, and increase the safety of the shredded products, so it is currently being used in the field of recycling of waste electrical and electronic products including secondary batteries. It can be widely used by replacing the methods and devices of.

The shredding method for stable shredding of small waste electrical and electronic products of the present invention and the shredding device for the same described above are exemplary, and those skilled in the art will recognize various modifications and equivalents thereof. It will be appreciated that other embodiments are possible. Therefore, it will be well understood that the present invention is not limited to the forms mentioned in the description of the invention above. The true technical protection scope of the present invention shall be determined by the technical spirit of the claims, and is understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention defined by the claims of the present invention. It has to be. In addition, terms or words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to explain his or her invention in the best way. It should be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

1: Shredder
10: Transparent cover
20: Inlet
30: Fluid ejection unit equipped with a nozzle
40: Crushing unit equipped with a crushing blade
50: discharge part
2: Inert gas cylinder
3: Water (salt water) tank
4: Shredded product collection unit
L: Piping (inert gas)
P: Piping (water, salt water)

Claims (7)

Secondary batteries and rechargeable and non-rechargeable small electrical and electronic products containing secondary batteries shall be shredded under any of the conditions a) to c) below that can control the risk of fire and explosion, and MgCl ₂ at the time of shredding. , CaCl ₂ , BaCl ₂ A method of shredding waste electrical and electronic products comprising spraying salt water containing any one of the salts and shredding them.
a) Nitrogen atmosphere conditions of more than 95%
b) Nitrogen atmosphere conditions of 80% to less than 95%
c) Carbon dioxide atmosphere conditions of more than 10% According to paragraph 1,
A method of shredding waste electrical and electronic products, wherein the brine contains 0.5 to 2% by weight of the salt and is sprayed at 0.3 to 1.9 L/min. According to paragraph 1,
A method of shredding waste electrical and electronic products, characterized in that the concentration of brine required to remove hydrofluoric acid is calculated from the content of hydrofluoric acid detected in the shredded product after shredding the waste electrical and electronic products by spraying water on them. According to paragraph 1,
Shredding of waste electrical and electronic products, characterized in that the waste electrical and electronic products are any one of lithium-ion batteries, robot vacuum cleaners containing lithium-ion batteries, handheld vacuum cleaners, Al speakers, Bluetooth speakers, wireless earphones, and wireless fans. method. According to any one of claims 1 to 4,
A method of shredding waste electrical and electronic products, characterized in that shredding secondary batteries or small rechargeable electrical and electronic products containing secondary batteries without dismantling or deactivating them. According to any one of claims 1 to 4,
The crushing is performed using a predetermined crushing device,
The crushing device is,
An inlet formed in an open and closed manner,
A fluid spray unit installed in the inlet and provided with a spray nozzle for spraying water or salt water into the inlet.
A crushing unit provided with a crushing blade for crushing the sample supplied through the inlet,
A gas injection unit installed in the crushing unit to inject an inert gas,
A method of shredding waste electrical and electronic products, comprising a shredder provided with a discharge unit that discharges the shredded products from the shredding unit. According to clause 6,
A shredding device for waste electrical and electronic products, characterized in that the inlet is provided with a transparent cover that can be opened and closed to enable visual observation or camera photography of the shredding situation inside the shredder.