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Roasting and chlorine leaching of gold

This paper deals with gold extraction from a refractory concentrate by chlorine leaching The process considers a pre-treatment of refractory materials by low temperature oxidation carried out ....

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...

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF ,

of corrosion and the use of a closed system Perhaps the biggest drawback in the use of the chloride/chlorine lies in the handling Thus, it is important to select an effective substitute for chlorine For extraction of gold from the refractory ores in which gold is surrounded by sul-...

Ozone For Leaching Gold Ore

Cyanide Gold Processing Plants , using oxygen from the existing supply and a portable ozone , cyanide available for leaching gold from , Read more Use of Ozone for Gold Extraction from a Highly Refractory ....

?burundi chlorine technology for ore processing

Processing technologies for gold-telluride or 2016-9-12 Processing technologies for gold-telluride ores lies on a fundamental understanding of the ore mineralogy and its chemical/physical behaviors under various leach, flotation, and oxidation conditions water vapor, carbon, sulfur, or chlorine...

Recovery Refractory Resources

148 PRECIOUS METALS PROCESSING Recovering refractory resources Refractory gold ore needs pre-treatment for cyanidation to be effective in gold recovery Ailbhe Goodbody looks at the advantages and disadvantages of the most common pre-treatment options, and speaks to some companies that offer or use the processes A refractory gold ore is gold-...

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...

Cyanide Leaching Of Gold

Leaching gold from sulfide ores is difficult, at best Generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30 , which is not a worthwhile venture The use of alkalies such as calcium oxide, will prevent the decomposition of cyanide in solution to form hydrogen cyanide gas...

How to Leach Gold Ore With Chlorination Sciencing

Apr 25, 2017 0183 32 How to Leach Gold Ore With Chlorination , The use of chlorine is both the cheapest and most plentiful method for leaching gold When you mix sodium chloride and hydrochloric acid together, you produce a form of electrolysis that removes gold from rock and soil , Aerating the mixture speeds up the leaching process, because it adds oxygen ....

gold leaching with chlorine plant

gold extraction by chlorination using a pyrometallurgical process mation of chlorine gas pH < 35 , the optimum leaching parameters were , extracting gold from the refractory ores, long leaching times more than 24 hours and , goldmanual of crushing plant custom gold washing plant price dry processing plant alluvial gold mining Read more...

Refractory ore chemistry Britannica

Other articles where Refractory ore is discussed gold processing Extraction from refractory ores Many gold-bearing ores and concentrates are not readily amenable to cyanidation, owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as it dissolves a phenomenon called preg-robbing , or completely surround the,...

leaching gold ore with chlorine

leaching gold with chlorine A Method for Leaching or Dissolving Gold from Ores or A Method for Leaching or Dissolving Gold from Ores or Precious chlorine water onto gold, suggested that the dissolution mechanism is based on metallurgical leaching of gold ores by cyanidation or in the aqua regia process used for the recovery of secondary gold...

gold leaching chlorine plant

Gold Ore Chloridizing Distillation Precious Metal Chlorine distillation method is mainly used to treat refractory gold ore Refractory gold ore refers to those ore has leaching rate less than 80 by standard cyanide leaching even for 20 30 hours...

The reasons of gold refractory, Gold ore classification ,

Nov 28, 2016 0183 32 I 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 ,...

Processing of refractory gold ores

Processing of refractory gold ores 1037 The oxidation tanks themselves are often configured in four stages with additional tanks employed in the first stage to accommodate the increased oxidation rates and aeration requirements in the initial phases of the reaction Residence times in the tanks are often of the order of 3 to 4 days...

Ammonia extraction of gold and silver from ores and other ,

May 19, 1992 0183 32 Many countries no longer allow the construction of new gold processing plants using cyanide Furthermore, the leaching kinetics of gold and silver with cyanide is very slow Leaching residence time is typically 2-4 days In addition, the gold industry in the USA and the world is facing problems associated with refractory gold-bearing deposits...

Methods of Processing of the Gold

method for processing the refractory sulfide ore is the method of hydro-chlorination along with thiocar-bamide As a method of processing the gold-containing tailings of the refractory sulfide concentrates we chose the method of electrochemical oxidation of sulfides in the ore pulp with the use of various chlo-...

Refractory Gold Mining SGS Finland

Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfid 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...

Refractory Gold Ore Treatment Methods

Cyanidation and concentration of gold and silver or List Gold Refractory Process Methods The use of roasting for the oxidation of sulfides has declined over the years However Resolute Mining resurrected the Syama project in Mali by converting the process from a whole-ore roast to flotation followed by concentrate roasting...

recovery of gold from ores with chlorine in 1898

Feb 05, 2013 0183 32 In using chlorine to extract gold you simply crush the stone or matrix so fine that it can get at the gold and take hold of it as a chloride The easiest way to do this is to put the chlorine in a solution in water, and so powerful is its action on gold that it dissolves that metal, holding it in , trying to process a low gold to ore or base ....

Electrolytic process for refractory arsenopyritic gold ores

Refractory arsenopyritic gold ore is a significant gold resource in the Eastern Goldfields of Western Australia Bio-oxidation has been used at three locations in the Eastern Goldfields to treat arsenopyritic - pyritic gold concentrates, but the process is slow and gold recovery can be incomplete...

Chlorination Leaching of Refractory Ores

Nichromet both has a process that uses chloride and bromide to leach gold from refractory ores high in sulphid I also suggest you look at papers by Dr Corby Anderson that use alkaline sulfide leaching to extract gold from refractory or The latter can be run at ,...

Gold recovery of refractory sulfide concentrates using ,

treat refractory gold ores chem ical chlorine , Directions for future research in processing refractory gold ores has been stated , To improve the recovery of low-grade refractory gold ores ....

Gold processing 101

In most cases, gold processing with cyanide leaching, usually with carbon adsorption, is still the core technology and the critical thing is understanding the mineralogy in order to optimise flowsheet selection and cost drivers, and get the best out of the process , Gold sulphur ratio GSR Refractory ores are typically treated by flotation ....

Leaching of an oxide gold ore with chloride/hypochlorite ,

Leaching of an oxide gold ore with chloride/hypochlorite solutions , problems associated with the use of cyanide in gold processing, , oxidation was carried out with refractory gold ore When ....

Gold extraction

Among free-milling gold ores placer gold is a special case, as there is no pre-treatment required for gold extraction Gold can be extracted from placer ores using physical separation techniques, particularly through gravity treatment In modern practice, concentrators use centrifugal force in order to liberate finer gold ,...

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES ,

oxidative pretreatment process using aqueous oxidation with the addition of nitrite as an oxidant on the recovery of gold from refractory gold ore METHODOLOGY Sample Preparation The refractory sulfide gold ore used in this study was the flotation concentrate of refractory sulfide gold ore, provided by PT...

Early Developments in Treating Pyritic and Refractory Gold ,

Journal of Australasian Mining History, Vol 10, October 2012 Early Developments in Treating Pyritic and Refractory Gold Ores in Australia KEN McQUEEN IAE, University of Canberra A fter quartz, pyrite iron sulphide is the mineral most commonly associated with gold1 In many pyritic gold ores significant gold occurs as intergrowths and small inclusions in the pyrite and probably in some cases ....

sketches tables

13 Flotation and subsequent processes refractory ore processing The flotation process is described in detail in chapter 33 Native gold, gold tellurides, and sulphides that contain finely disseminated gold can be floated and recovered in a concentrate In gold metallurgy flotation is often used as a pre-enrichment process for refractory or...

Advances in Gold and Silver Processing

Walker 1956 developed a process at Kalgurgli Ore Treatment Company for the treatment of zinc Merrill slimes by chlorination followed by reprecipitation using sodium sulphite A similar process was conducted by Finkelstein et al 1966 in South Africa for the treatment of Merrill slimes and gravity gold concentrates with chlorine leaching...

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