1、 Source of copper:

　　Chalcopyrite, chalcocite, hematite and Malachite are important copper deposits in nature. After the sulfide ore is calcined, it is melted with a small amount of silica and coke to obtain crude copper, then reduced to bubble copper and electrolytic refined to obtain copper. A new method of extracting copper is being studied. It is to break and blow up the underground low-grade mining atomic energy explosion, soak it in situ with dilute sulfuric acid, and then pump the leaching solution to the surface to deposit copper on iron filings.

　　2、 Main uses of copper:

　　Copper is a red metal, together with a green metal. It is said that it is a green metal, mainly because it is practical and easy to re melt and re exercise, so it is equally cheap to recover and use. Copper is a non-ferrous metal closely related to human beings. It is widely used in electrical, light industry, machinery manufacturing, construction industry, national defense industry and other fields. It is second only to aluminum in the consumption of non-ferrous metal materials in China. Copper is widely used and consumed in the electrical and electronic industries, accounting for more than half of the total consumption. It is used for all kinds of cables and wires, winding resistance of motor, switch and printed circuit board. In the manufacture of machinery and transport vehicles, it is used to manufacture industrial valves and accessories, appearance, sliding bearings, molds, heat exchangers and pumps. It is widely used in the chemical industry to make vacuum vessels, distillation pots, brewing pots, etc. It is used in the national defense industry to make bullets, shells, gun parts, etc. In the construction industry, it is used for various pipes, pipe fittings, decorative equipment, etc.

　　In the 1960s, the major shopping malls of copper were electrical and electronic shopping malls, accounting for about 28% of the total. In 1997, these two shopping malls became the second largest end users of copper consumption, with 25% shares. In many electrical products (such as wires, buses, transformer windings, heavy motors, telephone lines and telephone cables), the service life of copper is equally long. Only after 20 to 50 years, the copper inside can be recycled. The service life of other electrical and electronic products containing copper (such as small electrical appliances and consumer electronics) is relatively short, generally 5-10 years. Trading electronic products and large electrical products are generally recovered because they contain other precious metals in addition to copper. Despite this, the recovery rate of small consumer electronics products is still equally low because they have little copper in them.

　　With the rapid development of science and technology in the field of electronics, some stale copper containing products are becoming more and more outdated. For example, in the 1980s, telephone conversion stations and central business offices were the main sources of copper and copper alloy debris, but the rise of digital conversion made these bulky, metal intensive things more and more outdated.

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