No.2 copper 60450 yuan/ton; 92-93% 1# copper scrap 64400 yuan/ton; Brass with 97% copper is 40300 yuan/ton; Imported broken brass is 42,700 yuan/ton; Iron-bearing copper is both a metal element and a transition element. The chemical symbol is Cu, English copy, atomic number 29. Pure copper is a soft metal. When the surface is just cut, it is reddish orange with metallic luster, and the simple substance is purplish red. Good ductility, high thermal conductivity and electrical conductivity, so it is the most commonly used material in cables and electronic and electrical components. It can also be used as a building material and can form various alloys. Copper alloys have excellent mechanical properties and low resistivity, among which bronze and brass are the most important.

1. In addition, copper is a durable metal, which can be recycled many times without damaging its mechanical properties. The divalent copper salt is the most common copper compound. Its hydrated ions are usually blue, while chlorine as a ligand is green. It is the source of mineral colors such as sky blue and turquoise. It has been widely used as a pigment in history. Copper building structures will produce verdigris (basic copper carbonate) when corroded. Decorative arts mainly use metallic copper and copper-containing pigments. Copper is one of the earliest metals used by human beings. As early as prehistoric times, people began to dig open-pit copper mines and use the obtained copper to make weapons, tools and other appliances.

Second, the use of copper had a far-reaching impact on the progress of early human civilization. Copper is a metal that exists in the earth's crust and ocean. The content of copper in the crust is about 0.0 1%. In some copper deposits, the content of copper can reach 3% ~ 5%. Most of the copper in nature exists in the form of compounds, that is, copper ores. The activity of copper is weak, and the reaction between iron and copper sulfate can replace copper. Copper is insoluble in non-oxidizing acids, accounting for about 28% of the whole electrical and electronic market. From 65438 to 0997, these two markets became the second largest end users of copper consumption, with a market share of 25%.

Thirdly, in many electrical products (such as wires, buses, transformer windings, heavy motors, telephone lines and telephone cables), copper has a long service life. Only after 20 to 50 years can the copper in it be recycled. The service life of other copper-containing electrical and electronic products (such as small household appliances and consumer electronics) is relatively short, generally 5 ~ 10 years. Commercial electronic products and large electrical products are usually recycled because they contain other precious metals besides copper. However, the recovery rate of small consumer electronics products is quite low because there is almost no copper in them. With the rapid development of science and technology in the electronic field, some ancient copper-containing products are disappearing. For example, in the 1980s, telephone exchanges and central offices were the main sources of copper and copper alloy fragments, but the appearance of digital conversion made these heavy metal-intensive things more and more outdated.