O que está realmente em movimento
Pilbara hematite is rich enough to ship almost as it comes out of the ground. There is no flotation, no smelting, no chemistry at the mine — just crushing and screening, a private heavy-haul railway and a purpose-built port. All the transformation happens on another continent.
- O material
- Iron Ore
- A variedade
- Direct-shipping hematite fines, around 62% iron
- Onde começa
- Australia — The Pilbara, where banded iron formation was laid down over two billion years ago
Passo a passo, e fronteira a fronteira
Australia · Pilbara, Western Australia detido por Rio Tinto, BHP, FMG and others (Mineiro)
Blast, load, haul
Enriched hematite is drilled, blasted and hauled — much of it by autonomous trucks and driverless trains.
Por que aqui: Weathering leached the silica out of ancient banded iron formation and left almost pure hematite behind.
Australia · Mine-site plant detido por Miners (Mineiro)
Crush and screen. That is all.
Crushed and screened into lump and fines. No concentration is needed — the ore is already close to a saleable grade.
O que aconteceu ao restante: Almost nothing is discarded. Compare that with copper, where 984 tonnes in 1,000 go to tailings.
Por que aqui: Where the ore is good enough to ship, nobody builds a plant.
China · Port Hedland to Chinese mills detido por Miners and steelmakers (Trader)
Rail, port, Capesize
Trains up to 2.5 km long run to a private port, and Capesize bulkers sail to China. This is the highest-tonnage trade route on the planet.
Por que aqui: The steel mills are in Asia and the ore is in Australia. The whole business is logistics.
China · Integrated steelworks detido por Steelmaker (Fabricante)
Sinter, coke, and a blast furnace
Fines are sintered into lumps; coking coal is baked into coke. In the furnace the carbon strips the oxygen off the iron oxide — a chemical reaction, not just heat.
O que aconteceu ao restante: Roughly 500 kg of coking coal per tonne of hot metal, and the CO2 that comes with it. This reaction is why steel is hard to decarbonise.
Por que aqui: Integrated steelworks sit next to ports and next to demand.
China · Basic oxygen furnace detido por Steelmaker (Fabricante)
Blowing the carbon back out
Oxygen is blown through the hot metal to burn the carbon down to a few tenths of a percent. Manganese goes in — every tonne of steel needs some — and then whatever else the grade calls for: chromium, nickel, niobium, vanadium.
Por que aqui: Steel is the alloy where a dozen other materials in this atlas quietly end up.
China · Rolling mills detido por Fabricators (Fabricante)
Buildings, cars, rail, ships
Cast, rolled and cut. 620 tonnes of steel is roughly the frame of a mid-rise building, or five hundred cars.
O que aconteceu ao restante: Steel made from scrap in an electric arc furnace emits a fraction of this route's carbon. How fast steel can decarbonise depends on how much scrap exists — and you cannot recycle steel that has not been built yet.
Por que aqui: Two countries, one ocean, and by weight the largest thing humans move.
Este é um exemplo elaborado. Acompanha uma quantidade inicial declarada através de rendimentos e recuperações típicos publicados, pelo que as proporções são verificáveis; não é o registo de uma remessa específica. Os factos relativos à rota — quais os países, quais os processos e por que o material não pode simplesmente ser tratado noutro local — são compilados a partir de informação pública.