霍尔-埃鲁法是铝冶炼的主要工业方法。该方法包括将氧化铝(Al₂O₃)溶解在熔融的冰晶石(Na₃AlF₆)中,然后电解熔融的盐浴。铝金属沉积在阴极,而氧化铝中的氧气与碳阳极发生反应,生成二氧化碳。这一工艺使得铝的供应更加广泛且价格更加实惠。

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霍尔-埃鲁法是铝冶炼的主要工业方法。该方法包括将氧化铝(Al₂O₃)溶解在熔融的冰晶石(Na₃AlF₆)中,然后电解熔融的盐浴。铝金属沉积在阴极,而氧化铝中的氧气与碳阳极发生反应,生成二氧化碳。这一工艺使得铝的供应更加广泛且价格更加实惠。
Before the Hall-Héroult process, aluminum was considered a precious metal, more valuable than gold, due to the extreme difficulty of extracting it from its ore. The process operates at high temperatures, around 940–980 °C, inside large electrolytic cells called pots. Alumina has a very high melting point (over 2000 °C), making direct 电解 impractical. The key innovation was using molten cryolite as a solvent, which dissolves alumina and has a much lower melting point, significantly reducing the energy required.
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The process is extremely energy-intensive, consuming a significant portion of the world’s electricity. This is why aluminum smelters are often located near sources of inexpensive 水力发电 power. The high energy consumption also makes recycling aluminum highly advantageous, as it requires only about 5% of the energy needed to produce primary aluminum from ore.
霍尔-埃鲁法
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