Hydrometallurgical Processing of Precious Metal Ores

Abstract

Precious metals have been extracted since antiquity. However. the advent of modem day hydrometallurgical technique began less than a hundred years ago. Today, cyanidation extraction of precious metals supersedes all hydrometallurgical processesandits versatility is appreciated moreandmoreas thebreadth of its applications is widened through modifications such as dump and heap leaching, carbon-in-leach. carbon-in-pulp, chemical and autoclave oxidation, roast-leach, and ftotation-cyanidation. This paper reviews the advances that have taken place in the hydrometallurgical extraction of precious metals in the last century including the latest development such as bacterial oxidation and leaching with non-cyanide reagents such as thiourea and thiosulfate. Efforts have been made to cover the theoretical aspects as well as practical and economic aspects of these developments.

Polimetalik Bir Cevherden Falcon Santrifüj Zenginleştirici Kullanarak Altın Kazanımı Olanaklarının Araştırılması

“…Bu yöntemde, suda çözünen siyanür tuzları (sodyum veya potasyum siyanür) cevher ile temas ederek cevher içinde bulunan altını çözelti içerisine almaktadır. Siyanür liçi yönteminin dünya çapında kabul görmesinin başlıca nedeni, basit ve kendini kanıtlamış oluşudur [2]. Bununla birlikte cevher içerisindeki iri taneli altının kazanımında çeşitli gravimetrik (yer çekimi ile) zenginleştirme yöntemleri kullanılmaktadır.…”

Mechanistic Model—Based Speciation of Copper Complexes Adsorbed on Resin in an Ammoniacal Thiosulphate Resin-Solution System

“…Copper is generally found in the gold leaching of complex ores (Bhappu 1990;Marsden and House 1992). The presence of copper decreases the gold leaching efficiency, and it consumes an increased amount of reagent (Fagan et al 1997;Huang et al 1997).…”

Adsorption of Copper Complexes on Anion Exchange Resin in Non-Ammoniacal and Ammoniacal Thiosulfate Leaching Systems

“…The leaching of copper using thiosulfate reagent as alternative reagent to cyanide has been investigated since it is almost presented in gold thiosulfate leaching. In general, copper is found in the gold leaching of complex ores [1,2]. The present of copper reduces the efficiency of gold leaching and consumes additional reagent [3,4].…”