A fundamental study of the alkaline sulfide leaching of gold the alkaline sulfide system was studied as an alternative to cyanide for recovering gold from elemental sulfur It was found that been the dominant method for oxidising sulfide bearing gold ores and concentrates However with the cost

Processing Sulfide Ores Historically miners have shipped their sulfide concentrates to overseas smelters that have little to no regulations or emissions controls However with the implementation of the Mercury Export Ban of 2008 and the high costs of installing equipment to prepare sulfide ores for cyanide leaching many companies are searching for alternative forms of processing their sulfide ores

is much interest in developing an alternative way to extract gold from le benefits of leaching gold with something other than cyanide include easier processing of refractory ore bodies

M3TC Report GOLD EXTRACTION AND RECOVERY PROCESSES For Internal Use Only Please do not distribute 9 With many sulfide ores the ore cannot practically be ground down fine enough to expose the gold particles For cyanide to leach gold the cyanide solution must come into direct contact with gold molecules

May 27 2016 · Im hoping our HEPP process can either eliminate or significantly reduce the roasting step 1218 hours at 600700 degrees C which is currently required for the recovery of precious metals from sulfide laden ores If so our process consumes a fraction 4 cents per ton of the energy of roasting

Complex sulfide ores are finegrained intimate associations of chalcopyrite CuFeS 2 sphalerite ZnS and galena PbS disseminated in dominant pyrite and containing valuable amounts of minor elements Generally collectors employed for sulfide recovery are of the thiol type and the most commonly used are xanthates

Outlining best practices in gold processing from a variety of perspectives Gold Ore Processing Project Development and Operations is a musthave reference for anyone working in the gold industry including metallurgists geologists chemists mining engineers and many others

The addition of scrap iron to smelt mixes is a useful technique to smallscale operators experimenting with smelting techniques on goldsilver ores It could also be used with small lots of sulfide concentrates On the other hand there are alternatives for processing sulfide ores

This technology makes it possible to operate the system under less corrosive conditions with a lower chloride concentration and can be used as an alternative to cyanide To activate the process of dissolving gold and reduce the consumption of reagents in our technology ultrasonic reactors are used

Alternative Ore Processing We use alternative gold recovery methods in some processing plants to accommodate different ore characteristics or other requirements For example ore that has a high level of sulfide minerals or carbon or both is called refractory ore

rhenium sulfide rheniite ineed an alternative gold processing system for sulfide ores copper sulfide related copper sulfide process types copper sulfide copper sulfide cqc maximum copper grade of copper sulfide minerals cus cu2s rhenium concentration increases rhenium alloys tungsten rhenium zealand grinding equipment for sulfide ore

BACTERIAL LEACHING AS A PRETREATMENT STEP FOR GOLD RECOVERY FROM REFRACTORY ORES In this article pretreatment such as bioleaching before cyanidation is discussed as an alternative technique to treat refractory gold ores

Read Method for processing goldbearing sulfide ores involving preparation of a sulfide concentrate Minerals Engineering on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

The flotation process in general does not float free gold particles but is particularly effective when gold is associated with sulfide minerals such as pyrites In a typical pyrytic gold ore the gold is encapsulated within an iron sulfide crystal structure Highly oxidized ores generally do not respond well to flotation

Feb 13 2017 · Myself and another gentleman here in Arizona are trying to set up a smallscale portable gold processing system for the small deposit refractory ores we have here He actually still works in a facility in New Mexico and down in Tucson as well Hes got the mechanical aspect of it covered from runofmine crushing grinding and floatation

21 Pressure oxidation cyanidation chemistry The oxidation of gold and silver is a prerequisite for its dissolution in the alkaline cyanide lixiviant Pyrite along with arsenopyrite argentopyrite sphalerite and covellite are the most common host minerals of gold silver and electrum

Outlining best practices in gold processing from a variety of perspectives Gold Ore Processing Project Development and Operations is a musthave reference for anyone working in the gold industry including metallurgists geologists chemists mining engineers and many others

REFRACTORY ORE PROCESSING The common definition of “refractory” gold ores are those ores that do not allow the recovery of gold by standard gravity concentration or direct cyanide leaching One major category of refractory ores are gold values contained within the crystalline structure of sulfide minerals such as pyrite and arsenopyrite

Thiosulfate is generally considered to be an attractive alternative reagent to cyanide for processing gold It is relatively inexpensive and nontoxic forms strong gold and silver complexes and

experience ore mineralogy is known to affect thiosulfate leaching of gold and the stability of thiosulfate and gold thiosulfate species Specifically sulfide minerals retard gold leaching and catalyse the degradation of thiosulfate and gold thiosulfate Other reductants eg carbonaceous matter have

ContentsSummary Heap Leaching of Gold and Silver Ores Chapter 26 Advances in the Cyanidation of Gold Chapter 27 Alternative Lixiviants to Cyanide for Leaching Gold Ores Chapter 28 Thiosulfate as an Alternative Lixiviant to Cyanide for Gold Ores Chapter 29 Chloride as an Alternative Lixiviant to Cyanide for Gold Ores Gold Recovery Chapter 30