Metallurgy. The purer or more metallic part of a mineral, which sinks to the bottom of a crucible or furnace and is thereby separated out. Hence…
| 单词 | θ215473 |
| 释义 | society > occupation and work > materials > raw material > mineral material > ore > [noun] > purer metallic part (2) regulus1651 Metallurgy. The purer or more metallic part of a mineral, which sinks to the bottom of a crucible or furnace and is thereby separated out. Hence… head1832 Mining. In plural. In the process of mechanical concentration: the purest ore, which is the first to separate. Cf. head-tin n. at compounds 4, heading… |
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