also: こうし
noun
Technical term for the stony waste matter separated from metals during smelting or refining. Often replaced by the loanword スラグ in modern contexts.
See also: スラグ
製鉄所では大量の鉱滓が発生する。
A large amount of slag is produced at the steelworks.
鉱滓はセメントの原料として再利用されることがある。
Slag is sometimes reused as a raw material for cement.
Common loanword for 'slag'; more frequent in everyday technical contexts than 鉱滓.
Compound of 鉱 (ore, mineral) and 滓 (dregs, sediment). The reading こうさい is the standard on'yomi combination; こうし is a less common variant.