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by aboto zhimo on April 24th, 2005

aboto zhimo

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At what temperature does iron ore melt?

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  • by Joel Lyons on April 25th, 2005

    Joel Lyons

    Iron is one of the more common and cheapest
    metallic elements. By weight it makes up
    about 5% of the planet's crust where it is
    found as a range of slightly impure "iron
    ores," hematite, limonite, magnetite, etc.
    It was not until about 1200 BC that iron
    came into general use for the production
    of tools. This was because temperatures
    needed to process the ore exceeded what
    most ancient kilns were able to reach. Pure
    iron has a melting point of 1, 535 degrees
    centigrade. The limit of an ancient furnace
    was about 1,150. Later adding three to
    four percent carbon to the mixture could
    sometimes lower the melting temperature
    to as low as about 1,150, just at the furnace
    limit.

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