(a) a method of extracting gold and silver from ores by treatment with a dilute solution of sodium or calcium cyanide (or, formerly, potassium…
| 单词 | θ209368 |
| 释义 | society > occupation and work > industry > working with specific materials > working with metal > [noun] > hardening, tempering, or annealing > hardening by cyanide process (3) cyanide process1890 (a) a method of extracting gold and silver from ores by treatment with a dilute solution of sodium or calcium cyanide (or, formerly, potassium… cyaniding1894 cyanide hardening1921 case-hardening of iron or steel by the cyanide process. |
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