STEM与日常科技·英语30篇（7）
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Why Recycled Aluminum Saves So Much Energy
为什么再生铝能节省大量能源
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Making new aluminum from bauxite ore requires electrolysis at over 950°C, consuming vast amounts of electricity.
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Recycling scrap aluminum uses only 5% of that energy because melting needs just 660°C and no chemical separation.
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Each ton of recycled aluminum saves about 14,000 kWh—enough to power an average home for over a year.
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Aluminum retains its properties indefinitely, so cans, window frames, and car parts can be reused endlessly.
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Sorting technologies like X-ray fluorescence identify alloy types automatically on high-speed conveyor belts.
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Molten salt fluxes remove impurities during remelting, ensuring purity meets aerospace or packaging standards.
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Global recycling rates hover near 75% for cans but drop below 30% for building materials due to collection challenges.
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Designers now specify ‘design-for-recycling’ features—like detachable coatings—to simplify future recovery.
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Carbon footprint studies show recycled aluminum emits 95% less CO₂ than primary production per kilogram.
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Thus, circular economy principles turn metallurgy into a powerful climate solution.