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並前往http://www.epa.gov/sites/production/files/2015-09/documents/national-product-waiver-for-pig-iron-and-direct-reduced-iron-february-18-2015-508.pdf

National Product Waiver for Pig Iron and Direct Reduced Iron

Pig iron is a product of iron ore smelting in a blast furnace. It is made from molten iron, which has been cast in the shape of "pigs" as it ...

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