At the plant of the Consolidated Murchison Co in the Transvaal South Africa where a refractory highantimony gold ore is being treated flotation and cyanidation of the flotation concentrates and tailings are being practiced The association of the antimony and gold is very intimate and during 1946 while the antimony recovery amounted to
2 The gold ores with As must be broken or decomposed in the gold particles scales so that gold is fully exposed and then extracted with the appropriate gold leaching agent The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold
Figure 5 Refractory Ore Pretreatment Options In order to choose a pretreatment option for a refractory ore the main concern is attaining a solution which succeeds in preparing the ore for cyanidation whilst remaining economically feasible Mill Sizing The ore throughput rate of a mill is largely dependent on the mining production rate
The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching The ore assayed 20 gt Au and 220 gt Ag and contained predominantly quartzclay and barite and to a lesser extent sulphides such as pyrite stibnite sphalerite zinkenite Pb 9 Sb 22 S 42 and andorite Sb 3 PbAgS 6 The latter mineral was identified to be the most important sulphide phase for
arsenic refractory gold concentrate HGC is encapsulated as fine grained particles in the crystal structure of the mineral matrix which renders the metal inaccessible to the leaching agent Abrantes and Costa 1996 Ubaldini et al 1997 Karamanev et al 2001To achieve a satisfactory recovery an oxidative pretreatment stage is required to
Treatment of refractory gold ore whole ore and flotation concentrates has become more prominent since the 1980s with many gold discoveries often including ores that are wholly or partially refractory Refractory pretreatment processes include pressure oxidation biological oxidation and various forms of roasting Design teams familiar with all three pretreatment processes can maximize a projects value Gold recovery
energy consumption As a result proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores 56 The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique high efficiency energy conservation etc 78 Effective
Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores F NavaAlonso E ElorzaRodriguez A UribeSalas and R PerezGaribay the ore is classified as refractory There
May be increasing gold recovery from refractory gold ore with grade 23 gt to 9095Actual data of top refractory gold ore mines show that gold recovery is 70 and less What is reason It is a problem in minerals processing or it is a global science problem So if you work with refractory ore
Alkaline pretreatment of a refractory gold–silver ore containing antimony minerals such as stibnite andorite Sb3PbAgS6 and zinkenite Pb9Sb22S42 was tested using sodium hydroxide in order to
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