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Showing 1 to 1 of 1 for “"direct sulfation"”.
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Recycling neodymium-iron-boron magnet alloy by direct sulfation with SO₂ gas
… to recycle this electronic waste. Selective sulfation has been used to separate the neodymium from the iron in permanent magnets. Sulfuric acid is used to convert the metals to sulfates, which are then roasted to produce a calcine of neodymium sulfate and iron oxide. The calcine could then be …