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A refractory pyrite/arsenopyrite ore containing 3.7 g/ton of gold finely disseminated in the sulphide matrix was subjected to microbial leaching in a heap containing 120 tons of ore crushed to minus 15 mm. The ore was initially leached by means of acidophilic chemolithotrophic bacteria to oxidize the sulphide minerals and to liberate the gold.
Pretreatment Of Refractory Ores Prior To Gold Leaching. Leaching of a Refractory Gold Ore Sample from theThe. A cyanidation study was conducted on a mild refractory gold Pretreatment Of Refractory Ores Prior To Gold Leaching. Leaching of a Refractory Gold Ore Sample from theThe.
Pretreatment Of Refractory Ores Prior To Gold Leaching XSM is a leading global manufacturer of crushing and milling equipment (Pretreatment Of Refractory Ores Prior To Gold Leaching),XSM also supply individual (Pretreatment Of Refractory Ores Prior To Gold Leaching...) crushers and mills as well as spare parts of them.
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 ...
A method and apparatus are described for recovering gold from aqueous slurries of refractory gold ores containing sulfidic and/or carbonaceous matter. The method entails pretreating an ore slurry with chlorine in a multi-compartment autoclave operated at an elevated pressure. The chlorine used in this pressure chlorination pretreatment can be in either the gaseous or liquid state.
leaching of refractory ores results in incomplete gold recoveries, as a solution, a pre-treatment process should be implemented. Various pre-treatment, methods includes roasting, bio- oxidation, high-pressure cyanide leaching and pressure oxidation. With the development of new ozone generators, that
Processing technologies for gold-telluride ores | SpringerLink. This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated. ores based on the metallurgical per- silver bearing ores.
It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a ...
of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching. Key words: gold and silver ores; refractoriness; characterization; diagnostic leach 1 Introduction Generally, gold ores can be classified as "free milling" and "refractory" depending on their response to
energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. 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. [7,8] Effective ...
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: • Roasting
Oxidative pre-treatment in thiosulphate leaching of sulphide gold ores International Journal of Mineral Processing 94 (2010) 28–34 Contents lists available at ScienceDirect International Journal .
These findings suggest that alkaline sulfide leaching can be suitably used as a chemical pretreatment method prior to the conventional cyanidation for antimonial refractory gold and silver ores. This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver alloys
Nitric acid is a strong oxidant capable of rapidly oxidizing sulphide minerals. This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to...
These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. A refractory ore generally contains sulfide minerals, organic carbon, or both. Sulfide minerals are impermeable minerals that occlude gold particles, making it difficult for the leach solution to form a complex with the gold.
Pretreatment Process on Refractory Gold Ores with As449 Кб. KEY WORDS: arsenic-bearing gold ore; pretreatment process; refractory gold ore.Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold.
The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in future.
Prior art keywords gold gold ore pretreatment pyrite leaching Prior art date 2013-03-29 Application number PCT/JP2013/060870 Other languages French (fr) Japanese (ja) Inventor Original Assignee Jx Priority date (The priority date is an assumption and is not a legal conclusion.
Baseline leach experiments have established the refractory nature of the concentrate. Roasting of this concentrate at 450-550°C for one hour prior to leaching has increased gold and silver extraction values to approximately 89% and 70% respectively by thiourea leaching, and 76% and 74% by cyanidation.
In order to recover the precious metals contained in refractory ores it is necessary to modify the matrix of the ore by an oxidative pretreatment to expose the metals to cyanide.
of the leach residues resulted in 90 to 93 pct Au and 60 to 80 pct Ag extractions, compared with only 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching a low-grade gold ore and a bulk sulfide flotation concentrate prepared from it. Cyanidation of the leach
mineralogy of ores being encountered in which gold is locked up in various sulphidic host minerals. Gold ores are classified as highly refractory when at least 80% of the gold cannot be extracted by conventional cyanidation leaching even after fine grinding. A very common cause of refractoriness is the dissemination of fine grained or
For the refractory gold–silver ores associated with manganese minerals, this study has developed a reductive sulfating leaching pretreatment process to dissolve manganese minerals before gold–silver cyanidation, and pyrite has been proved that could be used .
In addition, the host mineral proves impervious to cyanide leaching, which prevents gold extraction. Refractory gold deposits are metallurgically complex and are therefore often difficult and expensive to develop and operate. Refractory gold ores require either or both physical and chemical pre-treatment, prior to cyanidation.
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