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A kind of method of crushing pcb board

A PCB board and shredder technology, applied in recycling technology, mechanical material recycling, plastic recycling, etc., can solve the problems of environmental pollution, large loss of crushing machines, shortened service life, etc., and achieve high sorting recovery rate and machine loss Small size and high crushing efficiency

Active Publication Date: 2018-02-13
AOSHIKANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The PCB board is a collection of glass fiber, resin, copper and tin. The metal content in the PCB board is about 40%. For the ever-increasing waste PCB boards and a large number of scraps from PCB board manufacturers, if there is no effective treatment method, it will be Harmful to the environment and a waste of resources
[0004] At present, the waste PCB boards are mainly processed by crushing or smelting. During the smelting process, a large amount of waste water and waste gas will be generated, which will cause more serious pollution to the environment; although the crushing method will not pollute the environment, the usual crushing method cannot be decomposed. The glue between the boards is easy to cause larger particles obtained by crushing the PCB board, and the sorting recovery rate is not high, which affects the secondary utilization. The general recycling rate can only reach about 65%. If you want to obtain a smaller PCB board crushing Granules need to prolong the crushing time, which will cause a large loss to the crushing machine, increase the workload of the crushing machine, shorten the service life, and increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for pulverizing PCB board of the present invention, comprises the following steps:

[0019] (1) Pulverization: Shear and pulverize the waste PCB board to 60-70mm in the pulverizer;

[0020] (2) Soaking: Soak the PCB board fragments crushed in step (1) in n-heptane for 5-10 minutes;

[0021] (3) Preheating: heat the PCB board fragments soaked in step (2) with an electric heater, and the temperature reaches 220°C;

[0022] (4) Pre-cooling: Refrigerate the PCB board fragments preheated in step (3) with a refrigerator, and the temperature is -15°C;

[0023] (5) Thermal shock: Thermally shock the PCB board fragments pre-cooled in step (4), the thermal shock time is controlled at 5-15s, the thermal shock temperature of the PCB board fragments rises from -20°C to 200°C, and the cooling Thermal temperature difference 220°C;

[0024] (6) secondary pulverization: the PCB board fragments after thermal shock in step (5) are carried out secondary pulverization with pul...

Embodiment 2

[0027] The method for pulverizing PCB board of the present invention, comprises the following steps:

[0028] (1) Pulverization: Shear and pulverize the waste PCB board to 60-70mm in the pulverizer;

[0029] (2) Soaking: Soak the PCB board fragments crushed in step (1) in n-heptane for 5-10 minutes;

[0030] (3) Preheating: heat the PCB board fragments soaked in step (2) with an electric heater to 240°C;

[0031] (4) Pre-cooling: Refrigerate the PCB board fragments preheated in step (3) with a refrigerator, and the temperature is -6°C;

[0032] (5) Thermal shock: Thermally shock the PCB board fragments pre-cooled in step (4), the thermal shock time is controlled at 5-15s, the thermal shock temperature of the PCB board fragments rises from -20°C to 250°C, and the cooling Thermal temperature difference 270°C;

[0033] (6) secondary pulverization: the PCB board fragments after thermal shock in step (5) are carried out secondary pulverization with pulverizer;

[0034] That is,...

Embodiment 3

[0036] The method for pulverizing PCB board of the present invention, comprises the following steps:

[0037] (1) Pulverization: Shear and pulverize the waste PCB board to 60-70mm in the pulverizer;

[0038] (2) Soaking: Soak the PCB board fragments crushed in step (1) in citric acid ester for 5-10 minutes;

[0039] (3) Preheating: heat the PCB board fragments soaked in step (2) with an electric heater to 200°C;

[0040] (4) Pre-cooling: Refrigerate the PCB board fragments preheated in step (3) with a refrigerator, and the temperature is -18°C;

[0041] (5) Thermal shock: Thermally shock the PCB board fragments pre-cooled in step (4), the thermal shock time is controlled at 5-15s, the thermal shock temperature of the PCB board fragments rises from -20°C to 280°C, and the cooling Thermal temperature difference 300°C;

[0042] (6) secondary pulverization: the PCB board fragments after thermal shock in step (5) are carried out secondary pulverization with pulverizer;

[0043]...

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Abstract

A method for crushing a PCB (printed circuit board) comprises the following steps: (1) crushing; (2) soaking; (3) preheating; (4) pre-cooling; (5) thermal shock; (6) crushing twice. The method disclosed by the invention is simple, and easy to operate; crushed particles are small, sorting and recovery rate is high, and recovery utilization rate reaches up to 98 percent; the method is high in crushing efficiency, short in crushing time, low in machine loss and cost, economic, environmental friendly and has less pollution.

Description

technical field [0001] The invention belongs to the technical field of PCB boards, in particular to a method for crushing PCB boards. Background technique [0002] With the continuous improvement of living standards, the consumption of electronic products continues to increase, and the replacement rate and obsolescence rate of household appliances continue to rise. The total number of household appliances that are updated every year, including TVs, washing machines, refrigerators, air conditioners, computers and other small household appliances, is 2 About tens of millions of units, it has become a very substantial problem to deal with the printed circuit boards in these waste electrical appliances, reduce environmental pollution and reuse resources. [0003] The PCB board is a collection of glass fiber, resin, copper and tin. The metal content in the PCB board is about 40%. For the ever-increasing waste PCB boards and a large number of scraps from PCB board manufacturers, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/04
CPCB29B17/04B29B2017/0416Y02W30/52Y02W30/62
Inventor 程涌贺文辉龚德勋
Owner AOSHIKANG TECH CO LTD
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