There are at least 5 million TV sets, 4 million refrigerators, and 6 million washing machines in my country every year that reach the end of life; 8 million tons of waste electronic products need to be processed every year. In addition, as the upgrading of electronic products such as computers, mobile phones, VCDs, and DVDs accelerates, the number of scrapped products will also rise sharply. How to better recycle these waste products called "e-waste" deserves attention. Abandoning home appliances contains huge resources. The plastics and the gold, silver, copper, aluminum and other precious metals and non-ferrous metals contained in waste home appliances have great resource reuse value. my country has now entered the peak period of household appliance scrapping, and the entire market has reached tens of billions of yuan.

　　The waste circuit boards currently on the market are mainly home appliances, computers and other circuit boards. Therefore, it can be divided into several categories for recycling. Those with electronic components need to be disassembled manually, and then the circuit board recycling equipment is used for disassembly and recycling; those without electronic components can be directly shredded and recycled.

　　Used circuit boards and circuit boards are all treasures

　　Waste circuit board disposal method I think many people don't know much about this, or just know a general idea. At present, the recycling of waste circuit boards has become an industry, which has far-reaching significance for social development. Recycling waste circuit boards can reduce resource waste, environmental pollution and other issues. The equipment and processes for the physical treatment and recycling of waste printed circuit boards mainly include the crushing and dissociation of waste printed circuit boards, and the separation of metals and non-metals by dry and wet separation techniques.

　　The study found that when crushed to 1.2mm, the waste motherboard can be basically dissociated. The crushed product contains about 6% copper, 18% other metals, and 76% non-metals; copper is mainly distributed in the powder <0.5mm, and the metal is mainly In the >0.5mm particle size; the high-frequency air separator can effectively separate non-metals and metals, and it has a wide range of separation particle size, low separation limit, and low operating cost. It is an ideal dry separation.

　　Circuit board recycling process

　　The recycling of "e-waste" in my country started late and developed rapidly. In recent years, relevant departments have successively promulgated policies and regulations such as the "Regulations on the Management of the Recycling and Disposal of Waste Home Appliances and Electronic Products" and the "Administrative Measures on the Pollution Control of Electronic Information Products", which have promoted the gradual transformation of the electronic information industry into an environmentally friendly and resource-saving green industry. At present, in the "Yangtze River Delta" and "Pearl River Delta" regions, there are already many companies whose main business is to dismantle "e-waste", forming a veritable circular economy, which on the one hand solves the employment problem and saves national investment On the other hand, it reduces resource consumption and waste discharge. This "e-waste" recycling model of "cheap renewable resources + cheap second-hand equipment + cheap labor = cheap products" highlights the efficient use of resources and the pursuit of large economic and social benefits with less resource consumption and environmental costs. It is worth paying attention to.

　　On the basic knowledge of PCB circuit board copper foil

　　1. Introduction to copper foil

　　Copperfoil (copper foil): a kind of cathode electrolytic material, a thin, continuous metal foil deposited on the base layer of the PCB circuit board, which acts as the conductor of the circuit board. It easily adheres to the insulating layer, accepts the printed protective layer, and forms a circuit pattern after corrosion. Coppermirrortest (copper mirror test): A flux corrosion test that uses a vacuum deposition film on a glass plate.

　　Copper foil is made of copper and a certain proportion of other metals. Copper foil generally has 90 foil and 88 foil, that is, the copper content is 90% and 88%, and the size is 16*16cm. Copper foil is the most widely used decorative material. Such as: hotels, temples, Buddha statues, golden signs, tile mosaics, handicrafts, etc.

　　2, product characteristics

　　The copper foil of the PCB circuit board has low surface oxygen characteristics, and can be attached to a variety of different substrates, such as metals, insulating materials, etc., and has a wide temperature range. Mainly used in electromagnetic shielding and anti-static. The conductive copper foil is placed on the surface of the substrate and combined with the metal base material. It has excellent conductivity and provides electromagnetic shielding effect. Can be divided into: self-adhesive copper foil, double-conducting copper foil, single-conducting copper foil, etc.

　　Electronic grade copper foil (purity above 99.7%, thickness 5um-105um) is one of the basic materials of the electronics industry. The rapid development of electronic information industry, the use of electronic grade copper foil is increasing, and PCB circuit board products are widely used in industry Use calculators, communication equipment, QA equipment, lithium-ion batteries, civilian televisions, video recorders, CD players, photocopiers, telephones, air conditioning, automotive electronic components, game consoles, etc. The domestic and foreign markets have an increasing demand for electronic grade copper foil, especially high-performance electronic grade copper foil. Relevant professional organizations predict that by 2015, China's domestic demand for electronic grade copper foil will reach 300,000 tons, and China will become the world's largest manufacturing base for printed circuit boards and copper foils. The market for electronic grade copper foil, especially high-performance foil, is optimistic. .

　　3. Global supply status of copper foil

　　Industrial copper foil can be commonly divided into two categories: rolled copper foil (RA copper foil) and point solution copper foil (ED copper foil). Among them, rolled copper foil has good ductility and other characteristics, which is used in the early soft board process. Copper foil, while electrolytic copper foil has the advantage of lower manufacturing cost than rolled copper foil. Since rolled copper foil is an important raw material for flexible boards, the improvement of the characteristics of rolled copper foil and price changes have a certain impact on the flexible board industry.

　　Since there are fewer manufacturers of rolled copper foil, and the technology is also in the hands of some manufacturers, customers have a low degree of control over price and supply. Therefore, under the premise of not affecting product performance, electrolytic copper foil is used instead of rolling Copper foil is a feasible solution. However, if the physical characteristics of the copper foil itself will affect the etching factors in the next few years, the importance of rolled copper foil will rise again in the thinning or thinning of products, and high-frequency circuit board products due to telecommunications considerations.

　　There are two major obstacles to the production of rolled copper foil, resource obstacles and technical obstacles. The resource barrier refers to the need for copper raw materials to support the production of rolled copper foil, and it is very important to occupy resources. On the other hand, technical obstacles discourage more new entrants. In addition to calendering technology, surface treatment or oxidation treatment technology is also the case. Most major global factories have many technology patents and key technology KnowHow, which increases barriers to entry. If the new entrants post-harvest processing and production, they are restrained by the cost of major manufacturers, and it is not easy to successfully join the market. Therefore, the global rolled copper foil still belongs to the market with strong exclusivity.

　　4. Development of copper foil

　　Copper foil in English is electrodepositedcopperfoil, which is an important material for the manufacture of copper clad laminate (CCL) and printed circuit board (PCB). In today's rapid development of the electronic information industry, electrolytic copper foil is called: the "neural network" of electronic product signal and power transmission and communication. Since 2002, the production value of China's printed circuit boards has surpassed the third place in the world. As the substrate material of PCB circuit boards, copper clad laminates have also become the world's third largest producer. As a result, China's electrolytic copper foil industry has developed by leaps and bounds in recent years. In order to understand and understand the past and present of the world and the development of China's electrolytic copper foil industry, and look forward to the future, experts from China Epoxy Resin Industry Association reviewed its development.

　　From the perspective of the production department and market development of the electrolytic copper foil industry, its development can be divided into three major development periods: the United States established the first world copper foil enterprise and the period when the electrolytic copper foil industry started; Japanese copper foil The period when enterprises fully monopolize the world market; the period when the world is multi-polarized and competes for the market.

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