'Green' gold extraction method replaces cyanide with
Extracting gold from ore is a poisonous business. The most common method is cyanide leaching, where cyanide salts in solution are used to suck the gold out from its ore. You get gold, but you also get highly toxic byproducts. However, chemistry postgraduate student Zhichang Liu has discovered- by
Gold Extraction Process. Sod ium cyanide has been used in the extraction of gold from ore for over a century. Today it is still considered the most efficient extraction method with sodium cyanide used in the leaching process in most gold mining operations.
Catalyzing Commercialization A Cyanide-Free Green Process
Gold is in high demand for products ranging from jewelry to electronics and medical devices. To extract gold from ore, mining companies typically use the sodium cyanide process, in which the gold is converted into a water-soluble coordination complex and activated carbon is used to leach the gold from the slurry.
Thiosulfate leaching of gold A review ResearchGate. The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options.
US5250272A Process for leaching precious metals with
A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O 2 /liter.
Cornstarch Replaces Cyanide In Gold Extraction , May 14, 2013 Cornstarch Replaces Cyanide In Clean New Gold Extraction, the gold out, but the cyanide can seep, developed a process to isolate gold from .
Background Cyanidation has been the industry standard process for leaching of gold since the beginning of the 20 th century. Cyanide is a powerful lixiviant that forms extremely stable complexes with gold.