iron sponge

American  

noun

Metallurgy.

1. sponge iron.

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Etymology

Origin of iron sponge

First recorded in 1875–80

Example Sentences

Either wrought, pig, iron sponge or iron bars are employed, and it is important to notice that the form in which the copper is precipitated, and also the time taken for the separation, largely depend upon the condition in which the iron is applied.

From Project Gutenberg

In the Blair process a metallic iron sponge was made from the ore in a closed retort, this sponge cooled down in receptacles from which the air was excluded, to the temperature of the atmosphere, then charged into a puddling furnace and heated for working.

From Project Gutenberg