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pretreatment of refractory gold ore

CA2705487A1 - Microbial pre-treatment of double refractory ...

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media.

Pretreatment Process on Refractory Gold Ores with As

The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle, characteristics and application of pretreatment technique of arsenic-bearing gold ores are presented in this paper. Several different classes of process options for pretreating refractory ores are ...

Gold mineral processing - Hatch Ltd

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. Refractory pre-treatment processes include pressure oxidation, biological oxidation and various forms of ...

Pretreatment Process on Refractory Gold Ores with As

Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

pretreatment of refractory ores prior to gold leaching

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES. 2 INTRODUCTION Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment...

Review Pretreatment Process on Refractory Gold Ores with As

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. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig ...

Pretreatment Process on Refractory Gold Ores with As

Download Citation on ResearchGate | Pretreatment Process on Refractory Gold Ores with As | The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle ...

Microwave pretreatment of a double refractory gold ore ...

With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%. However, there is no information published on the microwave processing of the double refractory gold ores.

Developments in the pretreatment of refractory gold ...

Developments in the pretreatment of refractory gold minerals by nitric acid D.-X. LI College of Environmental Science and Engineering, China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory gold

Pretreatment of a refractory arsenopyritic gold ore using ...

Mar 01, 2015· Read "Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Microwave pretreatment of a double refractory gold ore ...

Sep 01, 2007· Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar, B.; Pickles, C.A.; Kelebek, S. 2007-09-01 00:00:00 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.

Recovery Refractory Resources - sgs.com

most common pre-treatment options, and speaks to some companies that offer or use the processes A refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption processes. More specifically, it is an ore that has a gold recovery rate of less than 80% when direct cyanidation is applied to it.

ALTA Gold 2012 E-Doc - albionprocess.com

A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted. Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves.

Mineralogy and Pretreatment of a Refractory Gold Deposit ...

(B) Fine-grained gold, which was highly dispersed in the ore-bearing minerals, and the large amount of stratified silicate minerals were the main reasons for the poor pretreatment effect of the refractory gold ore whether it was gravity separation alone or flotation alone.

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD …

one of the leading emerging pre-treatment techniques being employed for the processing of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of other microorganisms.

Aeration pretreatment of low grade refractory gold ores ...

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.

Refractory Gold Ore Treatment Methods

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 …

Microbial Pretreatment of Refractory Gold Ore - Xinhai

Gold ore which is difficult to concentrate often referred to gold or refractory gold ore, which use conventional cyanide process cannot effectively extract most of the gold ore. Therefore, it is commonly said that the treatment of gold is the case of the cyanide method.

Gold extraction - Wikipedia

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.

WO2009069005A3 - Microbial pre-treatment of double ...

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. The fungal agent is inoculated in the feed material to either decompose sulfide sulfur or deactivate preg robbing carbon The culture media is applied, m the absence of a microbe, to decompose some sulfide sulfur and release a portion of the gold.

Gold Ore Roasting Techniques - Mineral Processing & Metallurgy

Arsenic, alloyed with gold-silver alloys, aids rather than hinders dissolution of gold in cyanide solution, and such could be ruled out as a cause of refractory behavior of gold-bearing arsenical ores. The presence of particles of precious metal in cyanide solution residues remains unexplained. Cyanidation and concentration of gold and silver ores

pretreatment of refractory gold ore - ellul.nl

pretreatment of refractory ore in gold ore processing. Gulin machine in gold processing plant, pretreatment of refractory ore in gold ore processing. Gulin provide the pretreatment of refractory ore in gold ore processing solution case for you. Gulin provides crusehr and grinding mill in quarry and ore plant Professional jaw crusher, cone ...

Pretreatment Process on Refractory Gold Ores with As

The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle, characteristics and application of pretreatment technique of arsenic-bearing gold ores are presented in this paper. Several different classes of process options for pretreating refractory ores are considered.

Overview of pretreatment technique of refractory gold ores ...

The characteristics of refractory gold ores and the principles of selecting pretreatment program are introduced.The development and new trends of the methods of roast,pressure oxidation and bio oxidation in recent years are summarized.

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING …

For extraction of gold from the refractory ores in which gold is surrounded by sul-fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. Pyrometallurgical oxidation by roasting is encountered with environmen-tal limitations; thus hydrometallurgical methods are preferred. These methods include

Fungal pretreatment of sulfides in refractory gold ores ...

This study was therefore aimed at investigating the ability of the CM-deactivating fungus, P. chrysosporium, to also solubilize/oxidize sulfides found in refractory gold ores so as to assess the potential of a single-stage process for the pretreatment of double refractory gold ores. 2. Experimental investigations 2.1. Materials

Improved gold and silver extraction from a refractory ...

Hydrometallurgy 105 (2011) 234–239 Contents lists available at ScienceDirect Hydrometallurgy j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / h yd r o m e t Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach Oktay Celep, İbrahim Alp ⁎, Hacı Deveci ...

Improvement of Gold Leaching from a Refractory Gold ...

Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores [1].

US20090158893A1 - Microbial pre-treatment of double ...

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. US20090158893A1 - Microbial pre-treatment of double refractory gold ores - Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number ...

The reasons of gold refractory, Gold ore classification ...

Nov 28, 2016· The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.