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How is cast iron different from pig iron...

How is cast iron different from pig iron?

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The iron obtained from blast furnace is called pig iron. It contains `4%` carbon and impurities like `S, P, Si, Mn` etc.
Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast. It has a slightly lower carbon content (about `3%`) and is extremely hard and brittle.
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT EXERCISE QUESTIONS
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  5. Giving examples, differentiate between roasting and calcination.

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  6. How is cast iron different from pig iron?

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