The Solvent Extraction of Gold Cyanide by Lauroimidazoline

Autor:	B R Green, A H Schwellnus
Rok vydání:	1990
Předmět:	Gold cyanidation General Chemical Engineering Cyanide Sodium Xylene Inorganic chemistry Extraction (chemistry) chemistry.chemical_element General Chemistry Amberlite Diluent chemistry.chemical_compound Carbon in pulp chemistry
Zdroj:	Solvent Extraction and Ion Exchange. 8:223-240
ISSN:	1532-2262 0736-6299
Popis:	The solvent extraction of gold cyanide from alkaline cyanide leach liquors by lauroimidazoline - a weak-base extractant - was investigated. The highly basic lauroimidazoline group extracted gold cyanide at a higher pH value than did Amberlite LA2 - a commercial alkylamine extractant with a pH value of protonation lower than that of the imidazoline group. The relative pH values where gold loading started to tail off were about 8 and 5 for the lauroimidazoline and the Amberlite LA2 extractants respectively. The pH value of extraction was higher for a higher concentration of lauroimidazoline in the organic phase with xylene as the diluent. The addition of tributylphosphate (an organic modifier) to the organic phase enhanced the basicity of imidazoline and hence the pH value of the extraction of gold cyanide by about two pH units. The extraction of gold cyanide passed through a minimum and increased above a pH value of 13. A synergistic solvation extraction mechanism, involving the sodium aurocyanide ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::22aeca8b88146c7d5b6cd0a5d7145dbc https://doi.org/10.1080/07366299.1990.11073610 Zobrazit plný text záznamu