| 单词 | cyanide process |
| 释义 | > as lemmascyanide process cyanide process n. (a) a method of extracting gold and silver from ores by treatment with a dilute solution of sodium or calcium cyanide (or, formerly, potassium cyanide); (b) the fixation of atmospheric nitrogen by chemical reaction at high temperatures so as to form alkali cyanides or other cyanogen derivatives; (c) a process for case-hardening iron or steel by immersing it in molten cyanide and then quenching it in water or oil. ΘΚΠ the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > industrial processes > cyanide process cyanide process1890 cyanization1926 cyanizing1926 society > occupation and work > industry > working with specific materials > working with metal > [noun] > extraction from ore > extraction of silver or gold cyanide process1890 cyaniding1894 cyanidation1896 society > occupation and work > industry > working with specific materials > working with metal > [noun] > hardening, tempering, or annealing > hardening by cyanide process cyanide process1890 cyaniding1894 cyanide hardening1921 1890 J. S. MacArthur in Jrnl. Soc. Chem. Industry 31 Mar. 270/1 By the cyanide process, ores containing lead, zinc, or earthy carbonates which cannot be worked to profit by chlorination, may be as..profitably treated as any other. 1895 M. Eissler (title) The Cyanide Process for the Extraction of Gold. 1926 E. Fyleman tr. B. Waeser Atmospheric Nitrogen Industry 486 (heading) The cyanide processes. 1940 R. H. Heyer Engin. Physical Metall. x. 341 The speed, low cost,..and cleanliness of the hardened surface make the cyanide process readily adaptable to production heat treatment. 1945 D. M. Liddell Handbk. Non-ferrous Metall. (ed. 2) II. xi. 294 Outside of smelting and refining, the present-day metallurgy of gold and silver may be summarized under three heads: mechanical methods.., amalgamation, and the cyanide process. 1959 Chambers's Encycl. VI. 413/2 The cyanide process was developed by J. S. Macarthur and R. W. and W. Forrest of Glasgow and used at Johannesburg in 1890. < as lemmas |
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