slag

n. 熔渣,铁屑,矿渣
v. 使变成熔渣,变熔渣

Some come off in the form of gases, others collect as slag.

有的化成气体跑掉了，有的结成了熔渣。

The limestone absorb impurity from the ore and form a fluid slag which floats on the surface of the heavier molten iron.

石灰石吸咐了铁矿石中的杂质，形成浮在较重的铁水表面上的流动渣。