1981年有41个国家,173家工厂生产原铝1660万吨。工厂规模由年产数4吨已发展到超过50万吨。美国生产490万吨,占首位,约为世界总产量的30%。其他主要生产国有苏联(15%)、加拿大(7%)、日本(5%)和联邦德国(5%)。加拿大铝业公司、美国铝业公司、雷诺金属公司、凯撒制铝及化学公司、彼施涅铝业公司和瑞士铝业公司等六大公司及其分公司或有关的公司控制着世界铝生产能力的38%。六大公司的主要经营是铝,但 In 1981, 41 countries and 173 factories produced 16.6 million tons of primary aluminum. The scale of the factory has grown from 4 tons of annual output to more than 500,000 tons. The United States produces 4.9 million tons, ranking the first place, about 30% of the world’s total output. Other major producing countries are the Soviet Union (15%), Canada (7%), Japan (5%) and the Federal Republic of Germany (5%). Aluminum Corporation of America, Alcoa, Renault Metal, Caesar Aluminum and Chemical Company, Percerio Aluminum Company and Swiss Aluminum Company and other six companies and their subsidiaries or related companies control the world’s aluminum production capacity Of the 38%. The six major companies are aluminum, but