Printed electronic circuit board (PCB) is the foundation of electronic industry and an indispensable part in all kinds of electronic products. And the main components of electronics waste are Cu 20%, Fe 8%, Sn 4%, Ni 2%, Pb 2%, Al 2%, ZN 1%, SB 0.4%, Au 1000g/t, Pd 50g/t and other substance. All of these metals are very precious and valuable. As for the resin and fiber is also the good industry products.
Various waste printed circuit boards
If you want to recycle the mixed metals and the resins, you should adopt scientific and reasonable method to ensure getting high recycle rate. At present, the most studied recycling methods can be generally divided into mechanical treatment, heating treatment, hydro-metallurgy, biological treatment and supercritical method. Among them, eating treatment and mechanical treatment are the most common method in the industry.
1. Heating treatment techniques
Heating treatment techniques include traditional incineration and pyrolysis.
The incineration method is to crush the waste printed circuit board and send it to the incinerator for incineration. The residue obtained is metal and fiber. After that, it is recovered by physical and chemical methods. The whole recycling process is very complicated. In addition, improper temperature control during incineration can produce highly toxic substances. Therefore, the environmental protection requirements for incinerators and their pollution prevention and control facilities are extremely strict. So, Doing do not recommend this method.
Pyrolysis is the use of anoxic or anaerobic conditions to decompose organic matter into gas, oil and glue to separate metal. Pyrolysis technology not only avoids the complicated separation process of technology and polymer materials, but also can recover heat energy and chemical materials from the pyrolysis products, with little environmental pollution. However, the technical process is complex and has not been applied in industrialization.
2. Mechanical treatment
Mechanical treatment is an effective method for the pre-separation of different components of waste circuit board. The process is divided into three steps: dismantling, crushing and sorting.
Process of mechanical treatment
(1)Dismantling is mainly to remove components and harmful substances on the printed circuit board.
(2)Crushing is to crush the PCB substrate into granular or powder, and the particle size varies according to different crushing methods.
(3)The main method of sorting is to take advantage of the differences in physical properties between substances, such as density, magnetism, electricity, surface properties and optical properties
Dry type PCB board recycling machine
In addition, there are two methods in mechanical treatment, including dry and physical type and wet type. But wet type produces waste water when processes PCB. While dry physical process is environmental method which is widely used in disposal PCB.
Doing introduces several method to recycle PCB above. If you have a great deal of PCB to recycle and have more questions, you can contact Doing. The engineers of Doing will provide solutions according to you needs.
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