| 单词 | black tin |
| 释义 | > as lemmasblack tin black tin n. [compare post-classical Latin stagnum nigrum, stannum nigrum (1195, 1508 in British sources)] Mining tin ore (usually cassiterite, SnO2) prepared for smelting, as distinct from metallic tin; cf. white tin n. at white adj. and n. Compounds 1g(c)(ii). ΘΚΠ society > occupation and work > materials > raw material > mineral material > ore > [noun] > tin ore > types of black tin1602 tin-witts1853 witts1853 1602 R. Carew Surv. Cornwall i. f. 13v They measure their blacke Tynne, by the Gill, the Topliffe, the Dish and the Foote. 1767 Philos. Trans. 1766 (Royal Soc.) 56 37 The best tin ore..will not melt without flux, nor do twenty pounds of black tin usually produce more than fourteen pounds of white. 1865 E. Burritt Walk to Land's End 320 The mine produces about 430 tons of black tin annually. 1936 Times 16 July 25/6 Geevor Tin.—Results for the three months ended June 30:—Tons of ore crushed, 14,267; tons of black tin (65 per cent. sn.) produced, 250. 2005 Frontier Star (Pakistan) (Nexis) 10 Dec. Total exemption of custom duty and sales tax on import of black tin used as raw material for manufacturing of tinplate. < as lemmas |
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