fluxstone

English

Noun

fluxstone (countable and uncountable, plural fluxstones)

1. Calcium-rich limestone used as a flux in metal smelting.
   • 1980, Robert S. Boynton, Chemistry and Technology of Lime and Limestone, 2nd edition, John Wiley & Sons, Inc., →ISBN, page 99:

     By far the predominant use of fluxstone is in smelting pig iron in the blast furnace, where limestone, as lime, reacts with impurities in the ore and fuel to form a molten slag that is removed gravimetrically.