1979年世界资本主义国家的锌产量仍保持1978年的水平(1978年产量为429万吨,消耗为438万吨)。近几年来,由于能源危机和公害问题,有些资本主义国家锌厂倒闭浪潮高涨,例如美国,在1970—1973年锌的生产能力有120—130万吨,到79年却降低到70—80万吨,其中大部分炼锌厂的设备陈旧,工艺落后,有的仍沿用平罐、竖罐、电热蒸馏等方法生产。即使 The world capitalist countries in 1979, zinc production remained at the level of 1978 (1978 output of 4.29 million tons, consumption of 4.38 million tons). In recent years, the tide of zinc plant closures in some capitalist countries has been rising due to the energy crisis and pollution problems. For example, in the United States, the zinc production capacity was 1.2-1.3 million tons in 1970-1973, while it was reduced to 700-80 million by 1979 Ton, most of which zinc smelter equipment obsolete, backward technology, and some still follow the flat tank, vertical tank, electric distillation and other methods of production. even if