Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate

Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate Solutions and Ion Flotation for Gold Recovery 83 In the last years, resin adsorption has become the most promosing technique for gold recovery. However, its high cost of enforcement and regeneration does not allow engineers to consider it as a practical way of gold recovery.

Gold Extraction and Recovery Processes

Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen.

Effect of additives on thiosulfate leaching of a gold ore

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, e.g. carbonaceous matter, have also been found to affect the stability of thiosulfate and gold thiosulfate.

Gold leaching by organic base polythionates: new non-toxic

The proposed method of the gold recovery comprises leaching with a solution of a mixture of sodium and ammonium hydrosulfite and thiosulfate, by sorption of the thiosulfate-gold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried out 2-10 hours after the leaching.

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Jul 10, 2017 · Besides, ammonia is an integral part of thiosulfate leaching of gold as it prevents the thiosulfate decomposition in aqueous solutions. In the absence of ammonia, thiosulfate decomposes and forms a sulfur coating on the surface of ore particles which leads to the gold passivation.

Improvement of thiosulfate stability in gold leaching

Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents. To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH4)2S2O3, 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours.

Thiosulphate Leaching | Mining | SGS

Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported.

Gold Ore Dressing For Processing Plant With Full Leaching System

Gold Ore Dressing For Processing Plant With Full Leaching System. Gold ore dressing products gold ore dressing equipment gold grinder from factory gold ore dressing equipment gold grinder from factory offers 4443 gold panning equipment products about 24 of these are mineral separator, 5 are other mining machines, and 1 are grinding equipment 100 tons per hour gold pan equipment in small scale

Ammoniacal thiosulfate and sodium cyanide leaching of preg

Goldstrike ore was leached using either an ammoniacal thiosulfate system or a sodium cyanide system. Leaching of the carbonaceous matter was conducted in batch experiments, as well as in columns at various flow rates to compare the mass of

thiosulfate leaching - Gold Refining Forum.com

Has anyone here actually used thiosulfate for leaching gold ore,and had positive results,that can be repeatable as a real leaching process? Has anyone found a real working precipitation process to recover the gold,that works well,and is dependable? Also getting the gold out of the precipitates seems to be a real pain.

process for thiourea and thiosulphate leaching -

Thiosulphate Dropped--Testing for PM? - Gold

Effect of inorganic additives on gold thiosulfate leaching

Thiosulfate gold leaching is an attractive alternative gold leaching method, especially when it comes to pregrobbing gold ores. In the Goldstrike operation of Barrick Gol- d Corp, Nevada, USA, the preg-robbing sulfidic ores are treated with alkaline and acidic pressure oxidation

A Method for Leaching or Dissolving Gold from Ores or

lurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

Sodium Thiosulphate Gold Leaching

The gold industry has been seeking alternative reagents for leaching gold from low-grade ores for the past 25 years. The cost and transport of cyanide, the poor recovery of gold from carbonaceous ores, the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors which can make cyanide unattractive in some circumstances.

Going for gold: Alternative processing methods - Australian

Jan 17, 2014 · Going for gold: Alternative processing methods. also now has to treat more complex ores as the easier to process gold ores are now all mined. Thiosulfate and bromide are used to leach the

Gold extraction - Wikipedia

The cyanide process is the industry standard. Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing : the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes.

Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate Gold

Thiosulfate Gold Extraction The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores.  The gold will dissolve only in small quantities.

thiosulfate leaching gold process

 · Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. Jacob Jason Demedici developed the thiosulfate leaching process because in some jurisdictions, increased

The role of ligands and oxidants in thiosulfate leaching of gold

thiosulfate leaching of gold from different ores under different conditions and highlights the importance of fundamental studies for a proper understanding of leaching processes, which in turn would be useful to minimise reagent

ALTA MetBytes - What39;s Happening in Gold Ore Processing

CSIRO, Australia, has developed a thiosulfate-based reagent system for gold leaching that has excellent stability and shown broad applicability in the laboratory compared to the thiosulfate system commercially implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA.

Thiosulfate leaching of gold - A review | Request PDF

Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high

THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION IN GOLD

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold deposits associated with preg-robbing ores. The thiosulphate leaching process, followed by resin-in-pulp gold extraction, has been

Thiosulfate leaching of goldA review - ScienceDirect

Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores.

Barrick Thiosulfate Leaching of Double Refractory Ore

The purpose of the thiosulfate leaching method is to deliver better gold recovery from double refractory ore. Double refractory ore is comprised of sulfidic and carbonaceous materials.

Thiosulphate Dropped--Testing for PM? - Gold Refining Forum.com

During leaching ferric oxide, Iron hydroxide and elemental sulfur will be in solids and copper in solution acting as oxidizer (oxygen rejuvenating the cupric Ion) and gold will be left with the thiosulfate IF this leach is working and IF all conditions are maintained in solution, (lt; 9 pH, and temperature also seem to be factors).

leaching in gold mineral processing new

Gold Leaching Carbon in Leach JXSC Machine. Gold Leaching( carbon in leach) process is widely used in the newly built gold leaching plants in recent years, and a lot of plants are changing into CIL as well.Gold Leaching CIL process is suitable for the treatment of oxidized gold ore with low sulfur content and mud content.

Thiosulphate Stability In Gold Leaching Process

sulphide- gold ore with a 2% increase of the gold extraction By decreasuig the concentrations of EDTA and copper sulphate to 0.0015M or lower, the imp- rwement of EDTA on thiosulphate consumption and goid extraction became insignifircant. Sulphite addition could improve the thiosuiphate stability slightly.

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Jul 10, 2017 · Besides, ammonia is an integral part of thiosulfate leaching of gold as it prevents the thiosulfate decomposition in aqueous solutions. In the absence of ammonia, thiosulfate decomposes and forms a sulfur coating on the surface of ore particles which leads to the gold passivation.

Coppercatalyzed thiosulfate leaching of lowgrade gold

Gold cyanidation Gold cyanidation also known as the cyanide process or the MacArthur Forrest process is a hydrometallurgical technique for extracting gold from low grade ore by converting the gold to a water soluble coordination complex It is the most commonly used leaching process for gold extraction Get Price

ALTA MetBytes - What39;s Happening in Gold Ore Processing

CSIRO, Australia, has developed a thiosulfate-based reagent system for gold leaching that has excellent stability and shown broad applicability in the laboratory compared to the thiosulfate system commercially implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in

Mineral processing - Wikipedia

Dewatering is an important process in mineral processing. The purpose of dewatering is to remove water absorbed by the particles which increases the pulp density. This is done for a number of reasons, specifically, to enable ore handling and concentrates to be transported easily, allow further processing to occur and to dispose of the gangue.