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Bauxite is red soil. It is refined into alumina, and alumina is smelted into aluminium by passing an enormous electric current through it. Because that last step is essentially electricity in solid form, the smelter is built next to cheap power rather than next to the mine — often on a different continent.
- 소재
- Bauxite
- 유형
- Gibbsitic bauxite, roughly 45% alumina, low silica
- 출발지
- Guinea — The Boké plateau, part of the largest bauxite reserve base in the world
단계별, 국경별
Guinea · Boké, Guinea 보유자 Mining consortia with the Guinean state (채굴업체)
Scraping the plateau
Bauxite lies at or near the surface under a thin overburden. It is ripped and loaded — no blasting, no grinding, no flotation. The simplest large-scale mining there is.
왜 이곳인가: Tropical weathering over millions of years made this. West Africa and northern Australia have most of it.
China · Kamsar, then Chinese and Gulf refineries 보유자 Traders and refiners (트레이더)
Rail to the coast, then a Capesize
Railed to a purpose-built port and loaded onto bulk carriers. Guinea ships hundreds of millions of tonnes a year of what is, physically, dirt.
왜 이곳인가: An export ban would force refining onshore — several countries have tried exactly that with different minerals.
China · Alumina refinery 보유자 Refiner (정련업체)
The Bayer process
Digested in hot caustic soda under pressure. The alumina dissolves; the iron and silica do not, and settle out as red mud. The dissolved alumina is then precipitated and calcined to a white powder.
나머지는 어떻게 되었는가: Red mud is the largest single waste stream in the metals industry by volume, and it is caustic. Storing it safely is the defining problem of this step.
왜 이곳인가: Refineries sit near ports and near smelters. Some are in Guinea now, but most of the capacity is not.
United Arab Emirates · Smelter, wherever power is cheap 보유자 Smelter (정련업체)
Electricity, made solid
Alumina is dissolved in molten cryolite at about 960 °C and an enormous direct current is passed through it. Aluminium collects at the bottom; the carbon anodes are consumed and must be constantly replaced.
나머지는 어떻게 되었는가: Roughly 125 tonnes of carbon anode is burned away — and that carbon started life as petroleum coke, from an oil refinery.
왜 이곳인가: Iceland, the Gulf, Quebec, Siberia, Yunnan. All the same answer: cheap, reliable, uninterruptible electricity.
Germany · Rolling and extrusion mills 보유자 Fabricators (제조사)
Frames, cans, cables, car bodies
Cast into billet and slab, then extruded or rolled. Recycled aluminium needs about a twentieth of the energy of primary, which is why scrap is worth so much.
왜 이곳인가: Four tonnes of Guinean soil for one tonne of metal — and once it exists, it can be melted and reused indefinitely.
이것은 작업 예시이다. 공표된 출발 수량을 공표된 일반적인 수율 및 회수율에 따라 추적한 것이므로 비율은 검증 가능하다. 특정 선적 기록이 아니다. 경로 사실—어느 나라, 어떤 공정, 그리고 왜 해당 소재를 다른 곳에서 처리할 수 없는지—은 공개 보고를 바탕으로 정리되었다.