WO2022156070A1

WO2022156070A1 - Method for separation and recovery of circuit board drilling waste

Info

Publication number: WO2022156070A1
Application number: PCT/CN2021/084937
Authority: WO
Inventors: 许校彬; 陈辉
Original assignee: 惠州市特创电子科技股份有限公司
Priority date: 2021-01-21
Filing date: 2021-04-01
Publication date: 2022-07-28
Also published as: CN112827671A; CN112827671B

Abstract

A method for separation and recovery of circuit board drilling waste. The method comprises: collecting waste produced in a circuit board drilling process in real time; pulverizing the collected waste; carrying out primary air separation to separate the pulverized waste to obtain copper powder and primary air separation products; carrying out secondary air separation to separate the primary air separation products, and during the secondary air separation, introducing low-temperature non-combustion-supporting gas into an air separation passage intermittently to obtain aluminum powder and secondary air separation products; and carrying out tertiary air separation to separate the secondary air separation products to obtain epoxy glass fiber powder and wood pulp powder. In the separation and recovery method, the low-temperature non-combustion-supporting gas is intermittently introduced during the secondary air separation process, such that the technical problem that aluminum powder is prone to being exposed to oxygen and water in the air, resulting in explosion during the recovery process is solved, thereby realizing the effect of resource recycling and safe resource recovery.

Description

Separation and recycling method of circuit board drilling waste

technical field

The invention relates to the technical field of circuit board manufacturing, in particular to a method for separating and recycling circuit board drilling waste.

Background technique

With the rapid development of the electronics industry, my country's PCB output and export volume ranks first in the world, and resource consumption and pollution problems will undoubtedly bring great pressure to my country. At present, the demand for circuit boards for 5G products continues to be strong. my country's 5G industry will usher in large-scale demand growth. Fueled by the 5G wave, the world's demand for Chinese circuit board products will inevitably increase. my country is also a country with a large population and scarce resources. The per capita possession of 45 major mineral resources is less than half of the world average. Such a large PCB export will undoubtedly cause great pressure to the country. Therefore, vigorously developing the renewable resource recycling industry has become an important part of our country's strategy of maintaining a balanced development of natural resources!

However, in the face of the pollution or waste of the circuit board industry, the environment is under enormous pressure, and the "bottleneck" of resources and the environment is increasingly restricted by the sustainable economic development. In the PCB industry, the application of wastewater treatment and reuse and heavy metal recycling technology has been relatively mature. The removal rate of copper, nickel, chromium, zinc, etc. in wastewater can reach more than 99.6%, and the copper content in the recovered sludge is as high as 55- 60%, but they do not pay enough attention to the waste in the machining process. Many PCB companies believe that resource recycling is not the "real business" of the company. Anyway, it can be disposed of. The machining waste is often ignored, wasted or discarded because of this. Especially for the recycling of the waste generated in the drilling process of the circuit board, most companies often do not pay enough attention and carry out corresponding technical upgrading and transformation, resulting in unnecessary waste of resources.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a method for separating and recycling circuit board drilling waste in order to solve the technical problem of how to separate and recycle the waste generated during the drilling process of the circuit board.

A method for separating and recycling circuit board drilling waste, comprising the following steps:

Real-time collection of waste generated during the drilling process of circuit boards;

Shred the collected waste;

The primary air separation separates the pulverized waste to obtain copper powder and the primary air separation;

The secondary air separation separates the primary air separation. In the secondary air separation, the low-temperature non-combustion-supporting gas is intermittently fed into the air separation duct to obtain aluminum powder and the secondary air separation;

The secondary air separation is separated by tertiary air separation to obtain epoxy glass fiber powder and wood pulp powder.

In one embodiment, the low-temperature non-combustion-supporting gas is carbon dioxide gas at a temperature of 5 degrees Celsius to 10 degrees Celsius.

In one of the embodiments, the copper powder obtained by the primary air separation is subjected to secondary pulverization and air separation separation again.

In one of the embodiments, the aluminum powder obtained by the secondary air separation is subjected to secondary pulverization and air separation separation again.

In one embodiment, the epoxy glass fiber powder obtained by tertiary air separation is subjected to secondary pulverization and air separation again.

In one of the embodiments, the wood pulp powder obtained by the tertiary air separation is subjected to secondary pulverization and air separation separation again.

In one embodiment, the step of pulverizing the collected waste includes:

Shred collected waste;

The crushed waste is quantitatively output.

In one embodiment, the secondary air separation separates the primary air separation. In the secondary air separation, low-temperature non-combustion-supporting gas is intermittently fed into the air separation duct to obtain aluminum powder and secondary air. In the step of air-selecting the isolate, it also includes:

A normal temperature non-combustion-supporting gas is fed to the obtained aluminum powder.

In one of the embodiments, the non-combustion-supporting gas at normal temperature is carbon dioxide gas at a temperature of 20 to 25 degrees Celsius.

In one of the embodiments, the step of collecting the waste generated during the drilling process of the circuit board in real time includes:

During the drilling process of the circuit board, the wastes in the area around the drilling and the drilling channel are collected in real time;

Collect waste together.

In the above method for separating and recycling circuit board drilling waste, the waste generated by the circuit board during the drilling process is pulverized in real time, and the pulverized waste powder is subjected to primary air separation, secondary air separation and tertiary air separation. Separation and other three-stage separation, copper powder, aluminum powder, epoxy glass fiber powder and wood pulp powder are obtained. During the secondary air separation process, low-temperature non-combustion-supporting gas is intermittently fed to reduce the secondary air separation. The temperature during the process is to prevent the aluminum powder from contacting the oxygen and water in the air and cause the aluminum powder to explode, which solves the technical problem that the waste generated during the drilling process of the circuit board is difficult to recover, and also solves the problem that the aluminum powder is easy to contact during the recycling process. The technical problem of explosion caused by oxygen and water in the air realizes the effect of resource recycling and safe recycling of resources.

Description of drawings

1 is a schematic flowchart of a method for separating and recycling circuit board drilling waste in one embodiment;

2 is a schematic diagram of a frame structure of a device for separating and recycling circuit board drilling waste in one embodiment;

FIG. 3 is a schematic structural diagram of a device for separating and recycling circuit board drilling waste in an embodiment.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Referring to FIG. 1, the present invention provides a method for separating and recycling circuit board drilling waste, and the method for separating and recycling circuit board drilling waste includes the following steps:

Step S101: Collect the waste generated during the drilling process of the circuit board in real time.

Step S103: Pulverize the collected waste.

Step S105 : the first-stage air separation is used to separate the pulverized waste to obtain copper powder and the first-stage air separation product.

Step S107 : the secondary air separation separates the primary air separation. In the secondary air separation, low-temperature non-combustion-supporting gas is intermittently fed into the air separation duct to obtain aluminum powder and the secondary air separation.

Step S109 : separating the secondary air separation by tertiary air separation to obtain epoxy glass fiber powder and wood pulp powder.

In one embodiment, the step of pulverizing the collected waste includes:

Shred collected waste;

The crushed waste is quantitatively output.

Collect waste together.

Please refer to FIG. 2 and FIG. 3 together, the present invention provides a circuit board drilling waste separation and recovery device 10, the circuit board drilling waste separation and recovery device 10 is the separation of the above circuit board drilling waste The device involved in the recycling method is an integral part of the above-mentioned method for separating and recycling circuit board drilling waste. The circuit board drilling waste separation and recycling device 10 includes: a collection mechanism 100, a crushing mechanism 200, a separation mechanism 300 and The collection mechanism 400, the collection mechanism 100 is used to collect the drilling waste, the crushing mechanism 200 is used to crush the drilling waste from the collection mechanism 100, the separation mechanism 300 is used to separate and classify the crushed drilling waste, and the recycling mechanism 400 is used to collect various substances after separation; the collection mechanism 100 includes a collection suction pipe 110 and a negative pressure generator 120, and the input end of the collection suction pipe 110 is used to be adjacent to the drilling area of the circuit board, so as to recycle in real time the generation in the drilling process of the circuit board. of waste. The output end of the collecting straw 110 is communicated with the input end of the negative pressure generator 120, the output end of the negative pressure generator 120 is communicated with the input end of the crushing mechanism 200, and the negative pressure generator 120 is used to generate negative pressure to make the drill adjacent to the circuit board The input end of the collection suction pipe 110 in the hole area sucks the waste and sends the waste into the crushing mechanism 200; the crushing mechanism 200 is used to crush the waste from the collection mechanism 100, and send the crushed waste into Separation mechanism 300; the separation mechanism 300 includes a primary cyclone separator 310, a secondary cyclone separator 320, a tertiary cyclone separator 330 and an explosion-proof air blower 340, the feeding pipe of the primary cyclone separator 310 and the output of the crushing mechanism 200 The ends are connected, the ash discharge pipe of the primary cyclone 310 is communicated with the copper powder recovery pipe of the recovery mechanism 400, the air outlet pipe of the primary cyclone 310 is communicated with the feeding pipe of the secondary cyclone 320; the secondary cyclone separation The ash discharge pipe of the cyclone 320 is communicated with the aluminum powder recovery pipe of the recovery mechanism 400, the air outlet pipe of the secondary cyclone 320 is communicated with the feed pipe of the tertiary cyclone 330; the ash discharge pipe of the tertiary cyclone 330 is communicated with The fiber powder recovery pipe of the recovery mechanism 400 is communicated with, and the air outlet pipe of the third-stage cyclone separator 330 is communicated with the wood pulp powder recovery pipe of the recovery mechanism 400; connected to the secondary cyclone separator 320 for intermittently feeding low-temperature non-combustion-supporting gas; the recovery mechanism 400 includes a copper powder recovery box 410, an aluminum powder recovery box 420, a fiber powder recovery box 430, and a wood pulp powder recovery box 440. The recovery box 410 is provided with a copper powder recovery pipe 411 that communicates with the ash discharge pipe of the primary cyclone 310, and the aluminum powder recovery box 420 is provided with an aluminum powder recovery pipe 421 that communicates with the ash discharge pipe of the secondary cyclone 320; The fiber powder recovery box 430 is provided with a fiber powder recovery pipe 431 that communicates with the ash discharge pipe of the third-stage cyclone 330; Tube 441.

In the above device 10 for separating and recycling circuit board drilling waste, the waste generated during the drilling process of circuit boards is sent to the crushing mechanism 200 for crushing in real time, and the waste powder crushed by the crushing mechanism 200 passes through the primary cyclone separator 310, the secondary cyclone 320, and the tertiary cyclone 330 carry out tertiary separation, and collect copper powder, aluminum powder, epoxy glass fiber powder and wood pulp powder into corresponding copper powder recovery boxes 410, aluminum powder recovery In the box 420 , the fiber powder recovery box 430 and the wood pulp powder recovery box 440 , the explosion-proof air blower 340 intermittently feeds the low-temperature non-combustion-supporting gas to the secondary cyclone separator 320 , thereby reducing the temperature in the secondary cyclone separator 320 Second, to prevent aluminum powder from contacting oxygen and water in the air and cause aluminum powder to explode, solving the technical problem that the waste generated in the drilling process of circuit boards is difficult to recover, and solving the problem that aluminum powder is easy to contact with oxygen in the air during the recycling process. The technical problem of explosion caused by mixing with water has realized the effect of resource recycling and safe recycling of resources.

In one embodiment, the normal temperature air supply pipe of the explosion-proof air blower 340 is communicated with the aluminum powder recovery box 420 for intermittently feeding the normal temperature non-combustion-supporting gas into the aluminum powder recovery box 420 .

In one of the embodiments, the non-combustion-supporting gas at normal temperature is carbon dioxide gas at a temperature of 20 to 25 degrees Celsius. The feeding of non-combustion-supporting gas at room temperature reduces the oxygen content of the air in the aluminum powder recovery box, reduces the contact area between the aluminum powder and the oxygen and water in the air, and prevents the aluminum powder from exploding.

In one embodiment, the low-temperature non-combustion-supporting gas is carbon dioxide gas at a temperature of 5 degrees Celsius to 10 degrees Celsius. In this embodiment, the low-temperature non-combustion-supporting gas is intermittently fed into the secondary cyclone separator 320 , that is, carbon dioxide gas at 5°C to 10°C is regularly and intermittently fed into the secondary cyclone separator 320 . Low temperature refers to lower than indoor temperature, such as 5 degrees Celsius to 10 degrees Celsius, the purpose is to reduce the temperature of aluminum powder and prevent aluminum powder from exploding due to high temperature. The purpose of intermittent is to prevent the temperature around the aluminum powder from being lowered for a long time due to the long-term use of low-temperature non-combustion-supporting gas, the condensation of moisture in the air to generate liquefied water droplets, and the explosion of aluminum powder when it contacts moisture. In addition, it also prevents the condensation of moisture in the air to produce liquefied water droplets, so that although the aluminum powder does not explode when exposed to water, it sticks to the pipe wall and causes the pipe to be blocked.

In one embodiment, the copper powder recovery box 410 is further provided with a secondary copper powder conveyor, the secondary copper powder conveyor communicates with the input end of the crushing mechanism 200, and the secondary copper powder conveys The device is used to send the copper powder in the copper powder recovery box 410 into the pulverizing mechanism 200 for secondary pulverization and winnowing and separation again.

In one embodiment, the aluminum powder recovery box 420 is further provided with a secondary aluminum powder conveyor, the secondary aluminum powder conveyor communicates with the input end of the crushing mechanism 200, and the secondary aluminum powder conveys The device is used to send the aluminum powder in the aluminum powder recovery box 420 into the pulverizing mechanism 200 for secondary pulverization and winnowing and separation again.

In one embodiment, the fiber powder recovery box 430 is further provided with a secondary aluminum powder conveyor, the secondary fiber powder conveyor communicates with the input end of the pulverizing mechanism 200, and the secondary fiber powder conveys The device is used to send the fiber powder in the fiber powder recovery box 430 into the pulverizing mechanism 200 for secondary pulverization and air separation again.

In one embodiment, the wood pulp powder recovery box 440 is further provided with a secondary wood pulp powder conveyor, and the secondary wood pulp powder conveyor communicates with the input end of the crushing mechanism 200, and the secondary wood pulp powder conveyor The wood pulp powder conveyor is used to send the wood pulp powder in the wood pulp powder recovery box 440 into the pulverizing mechanism 200 for secondary pulverization and air separation again.

In one embodiment, the collection mechanism 100 further includes a collection box, the input end of the collection box is connected to the output end of the negative pressure generator 120 , and the output end of the collection box is connected to the output end of the crushing mechanism 200 . The input end is connected, and the collection box is used to send the waste into the crushing mechanism 200 .

In one embodiment, a flow control valve is provided at the output end of the collection box, and the collection box feeds the crushing mechanism 200 quantitatively through the flow control valve.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A method for separating and recycling circuit board drilling waste is characterized in that, comprising the following steps:

Real-time collection of waste generated during the drilling process of circuit boards;

Shred the collected waste;

The primary air separation separates the pulverized waste to obtain copper powder and the primary air separation;

The secondary air separation separates the primary air separation. In the secondary air separation, the low-temperature non-combustion-supporting gas is intermittently fed into the air separation duct to obtain aluminum powder and the secondary air separation;

The secondary air separation is separated by tertiary air separation to obtain epoxy glass fiber powder and wood pulp powder.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the low-temperature non-combustion-supporting gas is carbon dioxide gas at 5 degrees Celsius to 10 degrees Celsius.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the copper powder obtained by primary air separation is subjected to secondary pulverization and air separation again.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the aluminum powder obtained by secondary air separation is subjected to secondary pulverization and air separation again.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the epoxy glass fiber powder obtained by the three-stage air separation is subjected to secondary pulverization and air separation again.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the wood pulp powder obtained by the three-stage air separation is subjected to secondary pulverization and air separation again.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the step of pulverizing the collected waste comprises:

Shred collected waste;

The crushed waste is quantitatively output.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the secondary air separation separates the primary air separation, and in the secondary air separation, intermittent air separation is performed. The step of sending the low-temperature non-combustion-supporting gas into the air duct to obtain the aluminum powder and the secondary air-selected separation material also includes:

A normal temperature non-combustion-supporting gas is fed to the obtained aluminum powder.
The method for separating and recycling circuit board drilling waste according to claim 8, wherein the non-combustion-supporting gas at normal temperature is carbon dioxide gas at 20 to 25 degrees Celsius.
The method for separating and recycling circuit board drilling waste according to claim 1, wherein the step of collecting the waste generated in the circuit board drilling process in real time comprises:

During the drilling process of the circuit board, the wastes in the area around the drilling and the drilling channel are collected in real time;

Collect waste together.