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霍尔-埃鲁法

1886-04-23
  • Charles Martin Hall
  • Paul Héroult
化学工程中采用霍尔-埃鲁法的工业铝冶炼厂。

(图片仅供参考)

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.

创新世界

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.

UNESCO Nomenclature: 3305
- 化学工程

类型

工业流程

中断

革命

用法

广泛使用

前体

  • hans christian Ørsted 和 friedrich wöhler 利用化学还原法分离铝
  • 将铝土矿精炼成氧化铝的拜耳法
  • michael faraday’s work on electrolysis
  • 迈克尔·法拉第发明了发电机,实现了大规模发电

应用程序

  • production of nearly all the world’s aluminum
  • 航空航天工业的飞机框架
  • 汽车工业中的发动机缸体和车身板
  • 窗框和结构构件的建造
  • 饮料罐和铝箔包装

专利:

  • US400664

潜在创新理念

  • 开发惰性阳极来替代碳,产生氧气而不是二氧化碳
  • molten oxide electrolysis for producing other metals like 钛
  • 低温离子液体溶剂替代冰晶石,降低能耗
  • 人工智能控制电解槽生产线,实时优化能源效率和阳极消耗
  • 捕获和利用冶炼过程中废热的系统
  • 直接电解铝土矿,绕过拜耳法生产氧化铝
  • 用于本地化生产的模块化小型铝冶炼厂
  • 利用该工艺直接在熔炉中生产铝钪合金
Related to: hall-héroult process, aluminum, alumina, cryolite, smelting, electrolysis, electrometallurgy, bauxite.

历史背景

霍尔-埃鲁法

1870
1876
1882-01-01
1886-04-23
1890
1897
1900
1867
1875-01-01
1881
1884
1890
1890
1899-01-01
1900

(如果日期未知或不相关,例如“流体力学”,则提供其显著出现的近似估计)

第十年 周年纪念日

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