A report on Cyanide, Silver and Ammonia

Removal of cyanide from cassava in Nigeria.
Silver is extremely ductile, and can be drawn into a wire one atom wide.
Ball-and-stick model of the diamminesilver(I) cation, [Ag(NH3)2]+
Silver(I) sulfide
Ball-and-stick model of the tetraamminediaquacopper(II) cation, [Cu(NH3)4(H2O)2](2+)
The three common silver halide precipitates: from left to right, silver iodide, silver bromide, and silver chloride.
Jabir ibn Hayyan
Crystals of silver nitrate
This high-pressure reactor was built in 1921 by BASF in Ludwigshafen and was re-erected on the premises of the University of Karlsruhe in Germany.
Structure of the diamminesilver(I) complex, [Ag(NH3)2]+
A train carrying Anhydrous Ammonia.
Different colors of silver–copper–gold alloys
Liquid ammonia bottle
Silver vase, circa 2400 BC
Household ammonia
Silver mining and processing in Kutná Hora, Bohemia, 1490s
Ammoniacal Gas Engine Streetcar in New Orleans drawn by Alfred Waud in 1871.
16th-century fresco painting of Judas being paid thirty pieces of silver for his betrayal of Jesus
The X-15 aircraft used ammonia as one component fuel of its rocket engine
Acanthite sample from the Imider mine in Morocco
Anti-meth sign on tank of anhydrous ammonia, Otley, Iowa. Anhydrous ammonia is a common farm fertilizer that is also a critical ingredient in making methamphetamine. In 2005, Iowa used grant money to give out thousands of locks to prevent criminals from getting into the tanks.
A 2004 American Silver Eagle bullion coin, minted in .999 fine silver.
The world's longest ammonia pipeline (roughly 2400 km long), running from the TogliattiAzot plant in Russia to Odessa in Ukraine
Embossed silver sarcophagus of Saint Stanislaus in the Wawel Cathedral was created in main centers of the 17th century European silversmithery - Augsburg and Gdańsk
Hydrochloric acid sample releasing HCl fumes, which are reacting with ammonia fumes to produce a white smoke of ammonium chloride.
17th century silverware
Production trend of ammonia between 1947 and 2007
A tray of South Asian sweets, with some pieces covered with shiny silver vark
Main symptoms of hyperammonemia (ammonia reaching toxic concentrations).
Proto-Elamite kneeling bull holding a spouted vessel; 3100–2900 BC; 16.3 x 6.3 x 10.8 cm; Metropolitan Museum of Art (New York City)
Ammonia occurs in the atmospheres of the outer giant planets such as Jupiter (0.026% ammonia), Saturn (0.012% ammonia), and in the atmospheres and ices of Uranus and Neptune.
Ancient Egyptian figurine of Horus as falcon god with an Egyptian crown; circa 500 BC; silver and electrum; height: 26.9 cm; Staatliche Sammlung für Ägyptische Kunst (Munich, Germany)
Ancient Greek tetradrachm; 315–308 BC; diameter: 2.7 cm; Metropolitan Museum of Art
Ancient Greek gilded bowl; 2nd–1st century BC; height: 7.6 cm, dimeter: 14.8 cm; Metropolitan Museum of Art
Roman plate; 1st–2nd century AD; height: 0.1 cm, diameter: 12.7 cm; Metropolitan Museum of Art
Roman bust of Serapis; 2nd century; 15.6 x 9.5 cm; Metropolitan Museum of Art
Auricular basin with scenes from the story of Diana and Actaeon; 1613; length: 50 cm, height: 6 cm, width: 40 cm; Rijksmuseum (Amsterdam, the Netherlands)
French Rococo tureen; 1749; height: 26.3 cm, width: 39 cm, depth: 24 cm; Metropolitan Museum of Art
French Rococo coffeepot; 1757; height: 29.5 cm; Metropolitan Museum of Art
French Neoclassical ewer; 1784–1785; height: 32.9 cm; Metropolitan Museum of Art
Neo-Rococo coffeepot; 1845; overall: 32 x 23.8 x 15.4 cm; Cleveland Museum of Art (Cleveland, Ohio, USA)
French Art Nouveau dessert spoons; circa 1890; Cooper Hewitt, Smithsonian Design Museum (New York City)
Art Nouveau jardinière; circa 1905–1910; height: 22 cm, width: 47 cm, depth: 22.5 cm; Cooper Hewitt, Smithsonian Design Museum
Hand mirror; 1906; height: 20.7 cm, weight: 88 g; Rijksmuseum (Amsterdam, the Netherlands)
Mystery watch; ca. 1889; diameter: 5.4 cm, depth: 1.8 cm; Musée d'Horlogerie of Le Locle, (Switzerland)
Price of silver 2009-2022

The principal process used to manufacture cyanides is the Andrussow process in which gaseous hydrogen cyanide is produced from methane and ammonia in the presence of oxygen and a platinum catalyst.

- Cyanide

In the presence of air, and especially in the presence of hydrogen peroxide, silver dissolves readily in aqueous solutions of cyanide.

- Silver

Cyanide is mainly produced for the mining of gold and silver: It helps dissolve these metals allowing separation from the other solids.

- Cyanide

The resulting adduct can be decomposed with ammonia to release the free alkene.

- Silver

Liquid ammonia is an ionising solvent, although less so than water, and dissolves a range of ionic compounds, including many nitrates, nitrites, cyanides, thiocyanates, metal cyclopentadienyl complexes and metal bis(trimethylsilyl)amides.

- Ammonia

Experts also warn that prolonged contact of ammonia solutions with silver, mercury or iodide salts can also lead to explosive products: such mixtures are often formed in qualitative inorganic analysis, and that it needs to be lightly acidified but not concentrated (<6% w/v) before disposal once the test is completed.

- Ammonia
Removal of cyanide from cassava in Nigeria.

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