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This causes the dissolved impurities such as silicon to be thoroughly oxidized. Wagner [7] has postulated a possible link via Persian contacts with China along the Silk Road and Viking contacts with Persia, [5] but there is a chronological gap between the Viking period and Lapphyttan. Archived from the original on 14 March Pig iron is an intermediate product of the iron industry , also known as crude iron , which is obtained by smelting iron ore in a blast furnace. Pig iron can also be used to produce gray iron. These types of pig iron are used to dilute all the elements except carbon in a ductile iron charge which may be harmful to the ductile iron process.

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