What is the basic knowledge and use of aluminum

Aluminum is a light metal, its compounds in the natural distribution is very wide, the earth's crust of aluminum content of about 8% (weight), second only to oxygen and silicon, with a total of third. In the variety of metals, second only to iron and steel, for the second major types of metals. The chemical and physical properties of special aluminum, is one of the most commonly used metal industry today, not only light weight, hard texture, but also has good ductility, electrical conductivity, thermal conductivity, heat resistance and resistance to radiation, is an important basis for national economic development of raw materials.

The specific gravity of aluminum is 2.7, the density is about 1/3 of the general metal. The conductivity of the aluminum wire is about 61% of the copper and the thermal conductivity is half of the silver. Although pure aluminum is extremely soft and malleable, it is reliable to be cold worked and made of alloy to harden it. Bauxite is an important source of aluminum, making a pound of alumina requires about two pounds of bauxite, and the production of a pound of aluminum metal also requires two pounds of alumina.

According to the content of the main components of aluminum ingots can be divided into three categories: high purity aluminum (aluminum content of 99.93%-99.999%), high purity aluminum (aluminum content of 99.85%-99.90%), industrial pure aluminum (aluminum content of 98.0%-99.7%).

In the past fifty years, aluminum has become one of the most widely used metals in the world. In the construction industry, because of excellent stability and anodic treatment of aluminum in the air after the appearance is greatly applied; also widely used Aluminum Alloy materials in aerospace and defense industry sector; reinforcing aluminum cable strong in electric power transmission is commonly used high strength steel wire; in addition, automobile manufacturing, container transport, daily necessities, household appliances, machinery and equipment will require a lot of aluminum.

With the rapid development of the national economy, China has gradually become a "global processing base, iron and steel, nonferrous metals and other basic industries are booming, in recent years, electrolytic aluminum production soared, the Chinese has become the world's largest producer of aluminum.

At the same time, our country in the global aluminum market is also playing an important role, because in recent years China's demand growth is strong, so the China supply and demand change, directly affect the balance of the world aluminum market through international trade.

However, there are many uncertainties in the supply of raw aluminum in China, which is caused by the continuing shortage of alumina supply, partly due to the shortage of power in China's system. Due to its limited resources, and the influence of primary mineral mining, product development and other areas for a period of time in the lack of investment, made in China in recent years have been a serious shortage of raw materials, the need to buy a lot of alumina from abroad every year, 2004 imported 5 million 870 thousand tons of aluminum oxide.

In addition to the problem of alumina and electricity, the government has imposed restrictions on the supply of raw aluminum, which is higher than the domestic consumption growth, with the aim of controlling some of the overheated. But whether it is the shortage of electricity or alumina supply, the overall impact on China's aluminum production is limited.

Aluminum use:

Aerospace aluminum used in the manufacture of aircraft skin, fuselage frame, beam, rotor, propeller, mailbox, wall panels and landing gear struts, as well as rocket forged rings, spacecraft, such as wall panels. Widely used in beverage, food, cosmetics, pharmaceuticals, cigarettes, industrial products and other packaging. Transport with aluminum can provide a full range of automotive materials of various types of Aluminum Alloy Metro and light rail with large porous profiles to fill the gaps, to meet the requirements of domestic subway cars, used in the manufacture of metro vehicle, railway passenger, high-speed car body structure, car doors and windows and shelves, automobile engine parts, air conditioner, radiator, body board, hub and ship materials. Packing with aluminum aluminum cans can stock is a measure of a country's level of aluminum sheet and aluminum sign mainly in foil form as metal packaging materials, made of cans, bottles, barrels, cover, foil. Printing aluminum printing industry bid farewell to the "lead and fire", entered the era of light and electricity... Aluminum based PS version for the printing industry to provide a strong support for this change. Aluminum used in electronic household appliances are mainly used in various fields such as bus, wire, conductor, electrical components, refrigerator, cable and so on. Aluminum foil for air conditioner has good deep drawing performance, high strength, good extensibility, and achieves the same level of imported products. Aluminum alloy used for architectural decoration is widely used in building frame, door and window, ceiling, decoration, etc. because of its good corrosion resistance, sufficient strength, excellent process performance and welding performance.