TWI542417B - A resourced processing system of waste of metalliferous pcb - Google Patents

Description

Recycling method for metal-containing printed circuit board waste

The invention relates to a resource processing method, in particular to a resource processing method for a metal-containing printed circuit board waste.

Printed circuit boards (PCBs) have been widely used in various electrical products, and the printed circuit boards are mainly made of glass fiber epoxy resin sheets, while general glass fiber epoxy resin sheets are made of epoxy resin for copper foil and glass. The bonding between the fiber cloths is to form a sandwich plate whose appearance is bare copper, so the main components of the substrate are copper foil, glass fiber cloth and epoxy resin, and the substrate is treated by the inner layer (filming, exposure, etching, black browning). ), pressing, drilling, electroplating (primary copper plating, secondary copper plating), outer layer processing (filming, exposure, development, etching, film removal), spray tin, gold plating and molding processes, etc., electroplating other metals The copper foil layer of the substrate is produced as a finished printed circuit board by forming the required wiring.

However, it is worrying that, in addition to the printing plate, during the manufacturing or use, the waste is formed by drilling and cutting, and when the electrical product is scrapped into waste, if the waste is not recycled, or recycled In the meantime, the heavy metals such as tin and copper contained in the internal waste printed circuit board and the epoxy resin which is a halide in the printed circuit board are more likely to cause the second pollution of the environment.

Therefore, how to effectively recycle and recycle recycled printed circuit boards, how to separate the metal contained in the glass epoxy resin board, and how to reduce the metal dissolution in the glass fiber resin, in order to achieve the public's efforts aims.

Accordingly, it is an object of the present invention to provide a resource processing method for a metal-containing printed circuit board waste, and to efficiently convert a printed circuit board which is originally a waste into a reusable resource.

Therefore, the present invention provides a method for recycling a metal-containing printed circuit board waste, comprising a collecting step, a crushing step, a magnetic separating step, a milling step, a sorting step, and the like; wherein the collecting step is a printed circuit After the plate is collected, the crushing step is used to break the printed circuit board to obtain a pellet, and then the magnetic separation step passes the pellet through the magnetic separator to select magnetic particles containing magnetic metal, and the magnetic metal is not contained. Instead of magnetic pellets, the grinding step is followed by a grinding action on the non-magnetic pellets to grind the pellets into powder pellets, and the sorting step is provided with a sorting machine for the pellets Input into the sorting machine, according to the specific gravity of the dust, sieving the metal dust and the waste glass fiber resin powder, and making the metal powder and the waste glass fiber resin powder and other resources for subsequent processing and application; In order to reduce the dissolution of the waste glass fiber resin, a modification step may be followed by adding an additive to mix, so that the waste glass fiber resin powder can form a fine pellet for subsequent use.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart of a first preferred embodiment of the present invention.

Figure 2 is a flow chart of a second preferred embodiment of the present invention.

The above and other technical contents, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

Referring to FIG. 1, a first embodiment of the present invention, a method for recycling a metal-containing printed circuit board waste, comprising a collecting step, a crushing step, a magnetic separating step, a milling step, a sorting step, and the like Wherein, the collection step is provided with a waste printed circuit board containing no electronic components, such as a printed circuit board from which electronic components have been removed after the scrapped electrical equipment is removed, or a printed circuit board is cut or drilled during production. The generated edge chips and the like can be used as the printed circuit board waste collected in the collection step; in addition, the crushing step breaks the printed circuit board into a pellet, and the crushed particle size is optimal. Control the pellets in 5-15mm.

Continuing with the foregoing, the magnetic separation step is provided with a magnetic separator (not shown) for filtering the magnetic material (such as iron) containing magnetic metal through the magnetic force of the magnetic separator, and the magnetic metal is not included. Non-magnetic pellets (such as glass fiber resin, copper, etc.); then, the grinding step can perform a grinding action on the non-magnetic pellets to grind the non-magnetic pellets into a powder pellet, and the pellets The optimum particle size is controlled between 0.5-2mm; finally, the sorting a step of providing a sorting machine (not shown) for inputting the powder pellet into the sorting machine to sieve metal dust (main component is copper) according to the specific gravity of the powder pellet Waste glass fiber resin powder (containing epoxy resin); that is, by the crushing step and the magnetic separation step, the magnetic metal material is magnetically separated and then ground and sorted for non-magnetic particles When the separation of the metal powder and the waste glass fiber resin powder in the sorting step is increased, the copper component contained in the metal powder is more pure, and the resource utilization benefit is increased.

Referring to FIG. 2, in the second preferred embodiment of the present invention, the embodiment further includes a collecting step, a crushing step, a magnetic separating step, a milling step and a sorting step; wherein the waste glass fiber resin obtained in the sorting step The powder is further subjected to a upgrading step, the upgrading step is provided with an additive, and in the embodiment, the additive component comprises 15 to 45 weight percent of SiO ₂ , 20 to 50 weight percent of CaO, 7.5 to 30 a weight percentage of Al ₂ O ₃ , 1 to 5 weight percent of Fe ₂ O ₃ , after being stirred by the waste glass fiber resin powder and the additive, coagulated and solidified into fine particles to make the fine particles contain The copper-soluble material can be effectively reduced. Of course, the fine-grained material after the modification can also be used as a resource for the fine aggregate of concrete, so that the waste glass fiber resin powder and the additive can be mixed into fine particles. The copper dissolution in the waste glass fiber resin powder is effectively reduced to avoid the second-degree pollution of the environment, and the waste glass fiber resin powder can be used in a wider range.

In summary, the resource processing method for the metal-containing printed circuit board waste of the present invention is obtained by collecting the printed circuit board waste, first breaking into pellets through a crushing step, and then magnetically selecting the pellets by the magnetic separation step. Magnetic The magnetic particles of the metal and the non-magnetic particles not containing the magnetic metal are then ground to the powder pellets, and then the powder particles are sieved to remove the metal powder according to the specific gravity (copper) And the waste glass fiber resin powder, the metal powder scrap and the waste glass fiber resin powder can be used for subsequent use, thereby effectively achieving the effect of resource utilization; further, the waste glass fiber resin powder can be further modified. Mixing with an additive to make the waste glass fiber resin powder form fine particles, and promoting the dissolution of the copper material dissolved in the waste glass fiber resin powder, thereby promoting the application field of the waste glass fiber resin powder , effectively achieve the purpose of resource.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

Claims (5)

A method for recycling a metal-containing printed circuit board waste, comprising: a collecting step, comprising: a printed circuit board without an electronic component; and a crushing step, the printed circuit board is broken, and further Obtaining a pellet; a magnetic separation step, comprising a magnetic separator, wherein the pellet is filtered through the magnetic separator to select a magnetic pellet containing magnetic metal, and a non-magnetic pellet containing no magnetic metal; a step of performing a grinding operation on the non-magnetic pellets to grind the non-magnetic pellets into a powder pellet; and a sorting step having a sorting machine for inputting the powder pellets into the sorting machine The metal powder waste and the waste glass fiber resin powder are sieved according to the specific gravity of the dust to be separately processed and utilized. The method for recycling a metal-containing printed circuit board waste according to the first aspect of the invention, wherein the waste glass fiber resin powder is further subjected to a upgrading step, the modifying step being provided with an additive for transmitting After the waste glass fiber resin powder is mixed with the additive, it is coagulated and solidified into a fine pellet. According to the resource processing method of the metal-containing printed circuit board waste according to claim 2, the additive component comprises 15 to 45 weight percent of SiO ₂ , 20 to 50 weight percent of CaO, and 7.5 to 30 weight percent. Al ₂ O ₃ , 1 to 5 weight percent Fe ₂ O ₃ . The method for recycling a metal-containing printed circuit board waste according to claim 1, wherein the pellet has an optimum crushing particle size of 5-15 mm. The method for recycling a metal-containing printed circuit board waste according to claim 1, wherein the optimum grinding particle size of the powdering step is 0.5-2 mm.