| 单词 | roasting and reaction process |
| 释义 | > as lemmasroasting and reaction process roasting and reaction process n. [compare German †Reactionsrösten (1882 or earlier)] Metallurgy (now rare) a process in the extraction of lead from galena (lead sulphide) in which the products of an initial roasting are strongly heated, causing a chemical reaction which produces lead and sulphur dioxide. ΚΠ 1868 W. Crookes & E. Röhrig Kerl's Pract. Treat. Metall. I. i. 16 This roasting and reaction is repeated until no more lead is produced.] 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 172 Scotch hearth, a low forge or furnace of cast-iron, with one tuyere, in which rich galena is treated by a sort of accelerated roasting and reaction process. 1946 Thorpe's Dict. Appl. Chem. (ed. 4) VII. 205/1 The roasting-and-reaction process is generally quite subsidiary, for the atmosphere in the furnace is essentially a reducing one, and oxidation of sulphide to sulphate cannot take place to any great extent. < as lemmas |
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