1.Aluminum is a soft and ductile silver-white metal. It is the third most abundant element in the earth's crust (after oxygen and silicon). It is also the most abundant metal, accounting for about 8% of the solid surface of the earth. the quality of. Aluminum metal is chemically very active, so it is generally difficult to find free metal aluminum unless it is in a very special redox environment. At present, more than 270 kinds of aluminum-containing minerals have been discovered in the world, and the most important aluminum-containing ore is bauxite. Aluminum and aluminum alloys have excellent properties such as light weight, easy processing, corrosion resistance, thermal conductivity, and strong recyclability. They are used in solar photovoltaic, construction, automobiles, rail transit, electronics, machinery, daily durable consumer goods and packaging materials. Has a wide range of applications. With the development of aluminum alloy technology, especially the technological progress in strengthening and toughening, structural weight reduction, corrosion resistance, service life, safety and reliability, etc., the demand for aluminum alloy materials with high alloying and high comprehensive performance is gradually increasing. Big. 2. China's aluminum and aluminum alloy output The data of the "Analysis Report on the Operation Status and Investment Direction of China's Aluminum Industry for 2020-2026" released by Zhiyan Consulting shows: China is a large aluminum production and consumption country, and the output of alumina and primary aluminum ranks first in the world. In 2019, China’s alumina and raw aluminum Aluminum output was 72,474,200 tons and 3,504,360 tons respectively. Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and it has been widely used in new energy, energy-saving buildings, automobiles, household appliances, electronic power, aviation, aerospace, machinery manufacturing, shipbuilding and chemical industries.