The earth’s crust is lined with its most dense metal, aluminum, but its origin is in conflict with its prevalence. What was once more valuable than gold today forms the basis of aerospace, defense, and even packaging industries. How did light metal aluminum become what it is today, transitioning from a rare luxury to cannot-do-without material? It requires nothing more than an interesting story of scientific progress, industrial genius, and relentless quest for perfection.
When British scientist Sir Humphry Davy first identified aluminum in the early 1800s, it was bound up in compounds and would not naturally occur. Scientists were baffled for decades by its stubborn nature, with early attempts at extraction failing. Danish physicist Hans Christian Ørsted had a rough extraction in 1825, followed by German chemist Friedrich Wöhler’s purer sample in 1827. But the methods were not effective, making aluminum unavailable for practical purposes. During the mid-19th century, France’s Emperor Napoleon III considered aluminum a strategic metal due to its applications in the military. He funded Henri Sainte-Claire Deville’s work, which produced the first industrial process of production but was laborious and costly. Then aluminum was so rare that Napoleon allegedly had aluminum forks served to honored guests, the others dining from gold forks.
The tide turned in 1886, when two young scientists, Charles Martin Hall in Ohio and Paul Héroult in France, independently of each other, developed the new method of producing aluminum. Their method, the Hall-Héroult process, used electricity to extract aluminum from its ore, bauxite. This revolution transformed aluminum from a costly metal at $16 per pound ($419 today) to material at $2 per pound within three years. By 1889, it had fallen to 50 cents, and aluminum was affordable enough for industrial-scale usage. The process remains the foundation of aluminum manufacture to this day, although its energy requirements have been an environmental concern.
The Industrial Revolution was simply too pleased to embrace aluminum, pushing it into applications that revolutionized industries. Aluminum was precious in the air. An aluminum-copper alloy was employed by the Wright brothers in the engine block of their revolutionary 1903 Wright Flyer, sufficiently lightening it to enable powered flight. With increasing airplane speeds, aluminum became the preferred metal for fuselages, supplanting wood and cloth. By World War II, aluminum had become a strategic war material, and Americans recycled pots and even gum wrappers to provide war production needs.
Aluminum’s role in space exploration is no less impressive. The Saturn V rocket of the Apollo mission that took men to the Moon employed enormous amounts of aluminum alloys in its structural components. NASA still employs aluminum-lithium alloys on spacecraft such as the Orion capsule, where weight reduction and strength are critical. curator at the Smithsonian National Air and Space Museum. Aluminum’s strength-to-weight ratio and heat conduction make it particularly well-suited to handle space’s harsh conditions.
Outside of the aerospace sector, aluminum revolutionized consumer goods. In 1959, the first aluminum beer can was launched, after the issues with steel cans that altered the taste of beer. The recyclability of aluminum was a revolution; recycling aluminum requires only 5% of the energy required to produce it primarily. Currently, nearly 75% of all aluminum ever sold remains in use, bearing witness to its eco-friendliness.
The Hall-Héroult process, while revolutionary, has an environmental cost. Producing aluminum releases approximately 1% of the Earth’s greenhouse gases. Technologies like inert anode technology aim to free the electrolysis process from CO2 emissions, towards a more sustainable aluminium future. Companies like Elysis are at the forefront of manufacturing “green aluminium” from renewable energy.
The history of aluminum is one of human will and ingenuity. From its humble beginnings as a valued metal that rivaled the Washington Monument to its central role in modern aircraft and space travel, aluminum has continuously adapted to sustain the needs of advancement. With businesses striving to be sustainable, the infinite recyclability of aluminum and shifting manufacturing processes ensure its role as a cornerstone of advancement. Whether soaring through the air, gliding through outer space, or stocking the shelves of your refrigerator, the path of aluminum is just beginning.
