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During the period of cooling and hardening from its molten state, BF slag can be cooled in several ways to form any of several types of BF slag products. Blast Furnace: Combustion material and ore are supplied from the top while an air flow is supplied from the bottom of the chamber.
A blast furnace produces two products: one is the pig iron that is the marketable/usable product and the other is slag that is typically discarded at the site. It was used later for roadkill and also apparently used to make some variants of Depression Glass.last furnace slag is distinctive. It is a dense glass. The colors come both from minerals and elements within the iron ore and the fluxing agent. There is archaeo-metallurgical discussion going on as to whether the process or the ingredients or both and if so, how much of either, if any, influenced the color.