Improved gold and silver extraction from a refractory antimony ore by pre-treatment with alkaline sulphide leach, Hydrometallurgy, 105, 3-4, 234–239.
Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented.
The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay 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 ...
Aeration curing, over a long duration in wetted stockpiles, shows promise as an affordable pretreatment method for oxidizing gold encapsulating sulfide minerals, and possibly organic matter, in low grade refractory ores. Following aeration pretreatment, the ore is reclaimed, neutralized, and cyanide leached by conventional practices. Large tonnages of subeconomic material, including mine ...
Table of ContentsExperimental ProceduresResults and DiscussionProposed Process Flowsheet The U.S. Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing arsenopyrite (FeAsS) and/or pyrite (FeS2). Pretreatment of a low grade ore containing 0.4% FeAsS, 3.5% FeS2, and 2.74g/mt Au with 1.2M NaOH, 40 psig 02, 100° C ...
REFRACTORY GOLD. By definition, refractory gold ores contain gold that is resistant to extraction by conventional chemical processing and as a result responds poorly to traditional gold cyanidation techniques such as Carbon-in-Leach (CIL), yielding less than 80% of the contained gold.
Pretreatment Of Refractory Gold Ore With Microwaves. Refractory gold ore pretreatment 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.
Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores F. Nava-Alonso, E. Elorza-Rodrı´guez, A. Uribe-Salas, and R. Pe´rez-Garibay CNVESTAV Saltillo, Carretera Saltillo-Monterrey km 13, Ramos Arizpe, Coahuila, Me´xico In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase ...
ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta,1 J. W. Langhans, Jr.,1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores. The best solution compositions for
Abstract Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an ...
Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified, there are a number of alternatives for treating the ore. Firstly, the gold can be made more amenable to cyanidation by ultra-fine milling, followed by a hot atmospheric leach –the Albion Process.
Effect of Pretreatment of Sulfide Refractory Concentrate, Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but
Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and …
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 result of the novel microbial pre-treatment process indicated that sulfide sulfur was degraded under alkaline conditions and carbonaceous matter passivated by T. versicolor at its optimum growth conditions. This led to a significant improvement in gold extraction from the double refractory gold ore and concentrate investigated.
A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. A ...
Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach
Title: Mineralogy and pretreatment of a refractory gold deposit in Zambia. Dear Reviewer, We would like to deeply thank you all for your carefully reviewing our manuscript (Title: Mineralogy and pretreatment of a refractory gold deposit in Zambia, Manuscript number: Minerals-531101). We also thank you for your careful read and thoughtful ...
Nov 28, 2016· The reasons of gold refractory, Gold ore classification, and preprocessing methods. Published on November 28, 2016 November 28, 2016 • 60 Likes • 9 Comments
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 ...
Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation . 1. Introduction . 1.1. Background . Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to
Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides. SGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum flowsheet for a particular ore. Our gold metallurgy expertise is second to none. Chemical interference
producer in Russia producing 710 400 ounces (22,1 tons) of gold in 2012. Malomir and Pioneer gold ores are refractory due to the gold association with sulfides. .... acid pretreatment of concentrate, along with carbonate decomposition, allows... Get Quote; Redalyc.Improved roasting of some colombian gold ores
The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction ...
Application Note Refractory Gold Pretreatment - pH Mining: Gold Processing Refractory gold ores are deﬁ ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction difﬁ cult. These types of ores require pretreatment prior to cyanidation. Options for pretreatment include the following processes:
Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore
Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore.
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