CN111346717A - A kind of waste paint bucket treatment method - Google Patents

Abstract

The invention discloses a method for treating waste paint buckets. A gas cooling method or a liquid nitrogen cooling method is used to treat the waste paint buckets in a cryogenic environment. The gas cooling method includes an air expansion refrigeration process and a compression refrigeration process; the present invention uses the characteristics of low temperature embrittlement of organic matter to cool the waste paint bucket to a corresponding ultra-low temperature state, so that the residue in the waste paint is embrittled, and the waste paint can be embrittled in a low temperature environment. The metal bucket and the waste in the bucket are separated, and then the metal bucket and the residue in the bucket are completely removed, and finally clean metal flakes and waste residue are obtained, which is convenient for subsequent treatment and utilization, and the treatment effect is better and more complete. The present invention realizes the pollution-free treatment of waste through the steps of crushing, cooling, embrittlement, separation and the like.

Description

A kind of waste paint bucket treatment method

technical field

The invention relates to the technical field of waste treatment methods, in particular to a waste paint bucket treatment method.

Background technique

Waste paint buckets (including waste oil buckets, waste resin buckets, etc.) are metal packaging wastes of paint, mineral oil, organic raw materials, etc., which are hazardous wastes and must be recycled by professional manufacturers with hazardous waste treatment qualifications. The main methods of waste paint buckets are: flattening method, crushing method, dry distillation method, and returning to steelmaking method, but the residue in the barrel is not effectively removed, the treatment effect is not good, and the residue is easy to cause secondary pollution. Therefore, The present invention proposes a method for treating waste paint buckets to solve the problems existing in the prior art.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention proposes a method for treating waste paint buckets. The method for treating waste paint buckets utilizes the characteristics of low-temperature embrittlement of organic substances to cool the waste paint buckets to a corresponding ultra-low temperature state, so as to embrittle the residues in the waste paints. The metal barrel and the waste in the barrel are separated in a low temperature environment, and then the metal barrel and the residue in the barrel are completely removed, and finally clean metal sheets and waste residue are obtained, which is convenient for subsequent treatment and utilization, and the treatment effect is better and more efficient. Complete, and the waste paint bucket treatment method realizes the pollution-free treatment of waste through the steps of crushing, cooling, embrittlement, separation, collection, etc. The whole process operates in a closed space and ultra-low temperature environment, and the treatment is the most thorough, environmentally friendly and safest .

In order to solve the above problems, the present invention proposes a method for treating waste paint buckets, which is used to treat the waste paint buckets in a cryogenic environment.

The utility model relates to a method for treating waste paint buckets, which uses a gas cooling method or a liquid nitrogen cooling method to treat the waste paint buckets in a cryogenic environment.

A liquid nitrogen cooling method includes the following two treatment processes: a process of first crushing and then cooling, and a process of first cooling and then crushing.

A liquid nitrogen cooling method, wherein the first crushing and then cooling process comprises the following steps:

Step 1: Put the waste paint into the crushing equipment, crush it first, then grind it, and cut and grind the waste paint bucket into pieces;

Step 2: Pump low-temperature nitrogen gas into the crushing equipment, the liquid nitrogen gasifies and absorbs heat, cools the processing environment in the equipment, cools the fragments of the waste paint bucket, and embrittles the organic residues on the fragments;

Step 3: Discharge the cooled fragments into a magnetic separator, which separates the metal fragments and the embrittled organic residues on them, and discharges them by classification.

A liquid nitrogen cooling method, wherein the first cooling and then crushing process comprises the following steps:

Step 1: Put the waste paint bucket into the crushing equipment, first pump the low-temperature nitrogen gas into the crushing equipment, the liquid nitrogen gasifies and absorbs heat, cools down the processing environment in the equipment, the whole paint bucket is cooled, and the residue in the bucket becomes embrittled;

Step 2: Start the crushing equipment, at low temperature, crush and grind the cooled waste paint bucket as a whole, and cut it into pieces;

Step 3: Discharge the fragments into the magnetic separator, which separates the metal fragments and organic residues and discharges them by classification.

A gas cooling method includes the following two treatment processes: an air expansion refrigeration process and a compression refrigeration process.

A gas cooling method, the air expansion refrigeration process comprises the following steps:

Step 1: Introduce air, remove impurities from the air, and filter the impurities in the air;

Step 2: The air is first compressed by the air turbine expansion unit, and then the air is expanded to release heat to obtain low-temperature air;

Step 3: Directly contact the low-temperature air with the waste paint bucket to conduct heat exchange to cool the waste paint bucket;

Step 4: Circulate the air, and continuously cool the waste paint bucket after removing impurities, compressing and expanding, until the waste paint bucket is cooled to a cryogenic state, and the residues in the bucket are catalyzed;

Step 5: Put the cooled paint bucket into the crushing equipment and break it into pieces, and then discharge the pieces into the magnetic separator to separate the metal pieces and organic residues.

A gas cooling method, the compression refrigeration process comprises the following steps:

Step 1: introduce the carrier cooling gas, remove impurities from the carrier cooling gas, and remove impurities such as water and oil in the gas;

Step 2: Start the refrigeration compressor, exchange heat between the refrigerant carrier gas and the evaporator of the refrigeration compressor, and reduce the temperature of the refrigerant carrier gas to below -50°C;

Step 3: Directly contact the low-temperature cooling gas and the waste paint bucket to conduct heat exchange to cool the waste paint bucket;

Step 4: Circulate the cooling gas, and continuously cool the waste paint bucket after removing impurities and heat exchange, until the waste paint bucket is cooled to a cryogenic state, and the residues in the bucket are catalyzed;

Step 5: Put the cooled paint bucket into the crushing equipment and break it into pieces, and then discharge the pieces into the magnetic separator to separate the metal pieces and organic residues.

The beneficial effects of the present invention are as follows: the present invention utilizes the characteristics of low temperature embrittlement of organic matter, cools the waste paint bucket to a corresponding ultra-low temperature state, embrittles the residue in the waste paint, and realizes the separation of the metal bucket and the waste in the bucket under the low temperature environment. , and then completely remove the metal barrel and the residue in the barrel, and finally obtain clean metal sheets and waste residues, which are convenient for subsequent treatment and utilization, and the treatment effect is better and more complete. Separation and other steps to achieve pollution-free treatment of waste, the entire process operates in a closed space and ultra-low temperature environment, the treatment is the most thorough, the most environmentally friendly and the safest.

Description of drawings

FIG. 1 is a front view of the fifth embodiment.

FIG. 2 is a schematic structural diagram of the crusher according to the fifth embodiment.

FIG. 3 is a schematic diagram of the cold source assembly of the fifth embodiment.

FIG. 4 is a schematic diagram of the grinding machine of the fifth embodiment.

FIG. 5 is a schematic diagram of the magnetic separator of the fifth embodiment.

FIG. 6 is a schematic structural diagram of the conveyor according to the fifth embodiment.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be described in further detail below with reference to the embodiments. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

The utility model relates to a method for treating waste paint buckets, which uses a gas cooling method or a liquid nitrogen cooling method to treat the waste paint buckets in a cryogenic environment.

Example 1

This embodiment provides a liquid nitrogen cooling method, and the first crushing and then cooling process includes the following steps:

Step 1: Put the waste paint into the crushing equipment, crush it first, then grind it, and cut and grind the waste paint bucket into pieces;

Step 2: Pump low-temperature nitrogen gas into the crushing equipment, the liquid nitrogen gasifies and absorbs heat, cools the processing environment in the equipment, cools the fragments of the waste paint bucket, and embrittles the organic residues on the fragments;

Step 3: Discharge the cooled fragments into a magnetic separator, which separates the metal fragments and the embrittled organic residues on them, and discharges them by classification.

Embodiment 2

This embodiment provides a liquid nitrogen cooling method, and the first cooling and then crushing process includes the following steps:

Step 1: Put the waste paint bucket into the crushing equipment, first pump the low-temperature nitrogen gas into the crushing equipment, the liquid nitrogen gasifies and absorbs heat, cools down the processing environment in the equipment, the whole paint bucket is cooled, and the residue in the bucket becomes embrittled;

Step 2: Start the crushing equipment, at low temperature, crush and grind the cooled waste paint bucket as a whole, and cut it into pieces;

Step 3: Discharge the fragments into the magnetic separator, which separates the metal fragments and organic residues and discharges them by classification.

Embodiment 3

This embodiment provides a gas cooling method, and the air expansion refrigeration process includes the following steps:

Step 1: Introduce air, remove impurities from the air, and filter the impurities in the air;

Step 2: The air is first compressed by the air turbine expansion unit, and then the air is expanded to release heat to obtain low-temperature air;

Step 3: Directly contact the low-temperature air with the waste paint bucket to conduct heat exchange to cool the waste paint bucket;

Step 4: Circulate the air, and continuously cool the waste paint bucket after removing impurities, compressing and expanding, until the waste paint bucket is cooled to a cryogenic state, and the residues in the bucket are catalyzed;

Step 5: Put the cooled paint bucket into the crushing equipment and break it into pieces, and then discharge the pieces into the magnetic separator to separate the metal pieces and organic residues.

Embodiment 4

This embodiment provides a gas cooling method, and the compression refrigeration process includes the following steps:

Step 1: introduce the carrier cooling gas, remove impurities from the carrier cooling gas, and remove impurities such as water and oil in the gas;

Step 2: Start the refrigeration compressor, exchange heat between the refrigerant carrier gas and the evaporator of the refrigeration compressor, and reduce the temperature of the refrigerant carrier gas to below -50°C;

Step 3: Directly contact the low-temperature cooling gas and the waste paint bucket to conduct heat exchange to cool the waste paint bucket;

Step 4: Circulate the cooling gas, and continuously cool the waste paint bucket after removing impurities and heat exchange, until the waste paint bucket is cooled to a cryogenic state, and the residues in the bucket are catalyzed;

Step 5: Put the cooled paint bucket into the crushing equipment and break it into pieces, and then discharge the pieces into the magnetic separator to separate the metal pieces and organic residues.

Embodiment 5

1 , 2 , 3 , 4 , 5 and 6 , this embodiment provides a liquid nitrogen treatment equipment for waste paint buckets, including a crusher 1 , a grinder 2 , a cold source assembly 3 , and a refrigerant pipeline 4 And the magnetic separator 5, the grinder 2 is provided at the right position below the crusher 1, and the cold source assembly 3 is provided at the left position below the grinder 2, and the cold source assembly 3 is connected with a cold source assembly 3. The coolant pipeline 4 is connected to the other end of the coolant pipeline 4 with the grinder 2, and a low temperature of -120°C is generated in the cavity of the grinder 2 to embrittle the paint. After the paint is embrittled, it is separated from the metal sheet. There is a magnetic separator 5 at the right position below the machine 2, and the mixture of paint powder and metal fragments is separated in the magnetic separator 5, and the two sides below the magnetic separator 5 are respectively provided with a first conveyor 6 and a second conveyor. Conveyor 7, a chute 8 is provided at the lower outlet of the crusher 1, and the bottom of the chute 8 is connected to the grinder 2, the crushed metal pieces fall from the crusher 1 through the chute 8 into the grinder 2, and the grinder 2. A blanking pipe 9 is provided on the right side of the bottom, and the lower part of the blanking pipe 9 is connected to the magnetic separator 5, and the ground metal sheet falls from the grinding machine 2 through the blanking pipe 9 into the magnetic separator 5. The outlet end of the first conveyor 6 is provided with a metal fragment bucket 10 for holding the separated metal fragments, and the outlet end of the second conveyor 7 is provided with a paint slag storage tank 11 for holding the separated metal fragments. paint powder. The crusher 1 includes a casing 12 and a crushing roller 13 , a crushing roller 13 is movably installed inside the casing 12 , and the crushing rollers 13 are provided with two groups that cooperate with each other. The wall is provided with crushing teeth 14 matched with the crushing roller 13 , one end of the casing 12 is provided with a motor 15 , and two sets of the motors 15 are arranged, and the output end of the motor 15 is connected with the crushing roller 13 . The cold source assembly 3 includes a cold source box 16 and a pressure pump 17 , the cold source box 16 is provided with liquid nitrogen, a pressure pump 17 is provided above the cold source box 16 , and the input end of the pressure pump 17 is It is communicated with the cold source tank 16 , and the output end of the pressure pump 17 is communicated with the refrigerant pipeline 4 to deliver the refrigerant into the cavity of the grinder 2 . One side of the top of the grinder 2 is provided with an inlet, the bottom of the chute 8 corresponds to the inlet, and a sealing cover 18 is hinged on the inlet to seal the cavity of the grinder 2 to create a low temperature environment. One side of the top of the magnetic separator 5 is provided with a feeding port 19, the bottom of the blanking pipe 9 corresponds to the feeding port 19, and the side below the magnetic separator 5 is provided with a metal fragment outlet 20, and The metal fragment outlet 20 corresponds to the first conveyor 6, and the separated metal fragments fall on the first conveyor 6. The other side under the magnetic separator 5 is provided with a paint powder outlet 21, and the paint powder outlet 21 Corresponding to the second conveyor 7 , the separated paint powder falls onto the second conveyor 7 . The first conveyor 6 and the second conveyor 7 have the same structure, and include a mounting frame 22, a roller 23 and a sidewall conveyor belt 24. Both ends of the inner side of the mounting frame 22 are provided with rollers 23, and the rollers 23 are provided with rollers 23. A driver is provided, and a sidewall conveyor belt 24 is wound around the surface of the drum 23, so that it is not easy to spread materials during conveying.

The waste paint bucket treatment method utilizes the characteristics of low temperature embrittlement of organic matter, cools the waste paint bucket to a corresponding ultra-low temperature state, embrittles the residue in the waste paint, realizes the separation of the metal bucket and the waste in the bucket under the low temperature environment, and then separates The metal bucket and the residue in the bucket are completely removed, and finally clean metal flakes and waste residue are obtained, which is convenient for subsequent treatment and utilization, and the treatment effect is better and more complete. , separation, collection and other steps to realize the pollution-free treatment of waste, the whole process operates in a closed space and ultra-low temperature environment, the treatment is the most thorough, the most environmentally friendly and the safest.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. A waste paint bucket treatment method is characterized in that: the waste paint bucket is treated in a cryogenic environment, wherein the temperature of the cryogenic environment is lower than-50 ℃.

2. A waste paint bucket disposal method as set forth in claim 1, wherein: the waste paint bucket is treated by using a gas cooling method or a liquid nitrogen cooling method in a cryogenic environment.

3. The liquid nitrogen cooling method applied to claim 2, characterized by comprising the following steps: the method comprises the following two treatment processes: a break-before-cool process and a cool-before-break process.

4. The liquid nitrogen cooling method according to claim 3, characterized in that: the crushing-before-cooling process comprises the following steps:

the method comprises the following steps: putting the waste paint into crushing equipment, crushing, grinding, cutting a waste paint barrel and grinding into fragments;

step two: introducing low-temperature nitrogen into crushing equipment by using a pump, gasifying and absorbing heat by using liquid nitrogen, cooling the processing environment in the equipment, cooling the fragments of the waste oil paint bucket, and embrittling organic residues on the fragments;

step three: and discharging the cooled fragments into a magnetic separator, separating the metal fragments and the embrittled organic residues on the metal fragments by the magnetic separator, and classifying and discharging the metal fragments.

5. The liquid nitrogen cooling method according to claim 3, characterized in that: the cooling-before-crushing process comprises the following steps:

the method comprises the following steps: putting a waste paint bucket into crushing equipment, pumping low-temperature nitrogen into the crushing equipment by using a pump, gasifying and absorbing heat by using liquid nitrogen, cooling the processing environment in the equipment, cooling the whole paint bucket, and embrittling residues in the bucket;

step two: starting crushing equipment, crushing and grinding the cooled waste paint bucket integrally at low temperature, and cutting the waste paint bucket into fragments;

step three: discharging the fragments into a magnetic separator, separating the metal fragments and the organic residues by the magnetic separator, and classifying and discharging.

6. A gas cooling method as claimed in claim 2, wherein: the method comprises the following two treatment processes: air expansion refrigeration process and compression refrigeration process.

7. A gas cooling method according to claim 6, wherein: the air expansion refrigeration process comprises the following steps:

the method comprises the following steps: introducing air, removing impurities from the air, and filtering impurities in the air;

step two: the method comprises the following steps that an air turbo-expander set is utilized to compress air, and then the air is expanded to release heat, so that low-temperature air is obtained;

step three: directly contacting low-temperature air with the waste paint bucket, and performing heat exchange to cool the waste paint bucket;

step four: circulating air, continuously cooling the waste paint bucket after impurity removal, compression and expansion until the waste paint bucket is cooled to a deep cooling state, and catalyzing residues in the bucket;

step five: and putting the cooled paint bucket into crushing equipment to be crushed into fragments, and then discharging the fragments into a magnetic separator to separate out metal fragments and organic residues.

8. A gas cooling method according to claim 6, wherein: the compression refrigeration process comprises the following steps:

the method comprises the following steps: introducing cold-carrying gas, removing impurities from the cold-carrying gas, and removing impurities such as water, oil and the like in the gas;

step two: starting a refrigeration compressor, and exchanging heat between the cold-carrying gas and an evaporator of the refrigeration compressor to reduce the temperature of the cold-carrying gas to below-50 ℃ of deep cooling;

step three: directly contacting the low-temperature cold-carrying gas with the waste paint bucket, and performing heat exchange to cool the waste paint bucket;

step four: circulating the cold-carrying gas, continuously cooling the waste paint bucket after impurity removal and heat exchange until the waste paint bucket is cooled to a deep cooling state, and catalyzing residues in the bucket;

step five: and putting the cooled paint bucket into crushing equipment to be crushed into fragments, and then discharging the fragments into a magnetic separator to separate out metal fragments and organic residues.

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