| 单词 | cyanide process |
| 例句 | By the cyanide process, i.e. dissolving the gold in potassium cyanide solution, and then precipitating the metal; 5. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z The cyanide process, introduced about 1890, is now one of the most important factors in the utilization of low-grade and refractory gold and silver ores. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" Again the milling results were not good, and what it demanded was the cyanide process. The Plunderer In the extraction of gold and silver from their ores by amalgamation, large amounts of metallic mercury have been utilized, but of late years the wide application of the cyanide process has decreased this use. The Economic Aspect of Geology At the time that the outcrop in the Rand become exhausted, what is today known as the "cyanide process" had never been used in that part of the world. An African Adventure The discovery of the cyanide process of treating gold and silver ores permitted the exploitation of many mines which could not be worked under the older methods. My Four Years in Germany |
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