| 单词 | coal brass |
| 释义 | > as lemmascoal brass coal brass n. Mining (frequently in plural) iron pyrites found in some coal-bearing strata; cf. brass n. 1e. ΚΠ 1809 Tradesman 1 Feb. 144 The exposure of surface in the pyrites or coal brasses. 1865 H. Watts Dict. Chem. III. 343 Some kinds of the ore known as ‘coal brass’ also contain a considerable amount of ferrous carbonate. 1917 Proc. Engineers' Soc. Western Pennsylvania 33 664 Coal brasses which are jigged out are sold to pyrite manufacturers. 2003 J. A. Kent Riegel's Handbk. Industr. Chem. (ed. 10) xiv. 493/1 Sulphuric acid..is made by the action of bacteria (Thiobacillus ferrooxidans) on coal brasses or iron disulfide discarded on refuse dumps at coal and copper mines. < as lemmas |
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