extraction of gold from the sulphide ore

Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.

Recovery of Gold in Pyritic Sulfide Ores - Mine Engineer.Com

Recovery of gold in sulfide ores has fallen into several egories. First is froth flotation, and second is cyanidation of the ores. Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key ...

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES USING DIRECT ...

recovery from the refractory sulfide gold ores. An oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. The conventional methods of extraction of refractory sulfide gold ores usually follow roasting-leaching and electrowinning steps. Roasting is one oxidative pretreatment technique for sulfide minerals through ...

Process to Recover Gold from Sulfide Ores - GOLD PROSPECTING ...

In fact, we have tons of sands coming from the gold extraction process using cyanide. These sands still have in average 20gr/ton of gold. The problem is that we haven& 39;t found a reliable process or technology to effiently recover the gold at least 70% of the remaining gold because these sands contain elements making cyanide-based treatment ...

Gold Extraction - an overview ScienceDirect Topics

The effect of pH value on gold extraction for various ore types is shown in Figure 28.4.Greatly increasing pH value has a beneficial effect on gold extraction for both oxide and sulfide ores and stabilizes ∼pH 9.5–10.0, whereas for some carbonaceous ores, pH value has no apparent effect.

Smelting and Roasting Ores to recover gold, silver and other ...

Once the ores are fully roasted, and the sulfur is driven off, the extraction of the gold or silver from the ore is not especially difficult. Treatment of the roasted ores was done by normal methods such as amalgamation or cyanide treatment.

How to Use Bleach on Gold Ore to Remove Gold Sciencing

Gold is an almost non-reactive metal, but halogens — chlorine, bromine, fluorine and iodine — can dissolve it. Chlorine is the cheapest and lightest product that can achieve this. Bleach is the chemical compound sodium hypochlorite. When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore.

How to Extract Precious Metals From Sulfides Sciencing

Extract sulfide ore deposits from the ground and place in to the crusher to mince ore from 5 to 50 micrometers. Crushing begins the separation process by preparing the ore to be floated in water. First, the ore is crushed using a gyratory crusher to reduce the ore to 6-inch diameter pieces.

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES USING DIRECT ...

recovery from the refractory sulfide gold ores. An oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. The conventional methods of extraction of refractory sulfide gold ores usually follow roasting-leaching and electrowinning steps. Roasting is one oxidative pretreatment technique for sulfide minerals through ...

Recovery of Silver, Gold, and Lead From a Complex Sulfide Ore ...

minerals in complex ores; but, as with caustic cyanide, gold and silver extrac­ tion is usually low with complex sulfide gold-silver ores. A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 6 . Considera­ ble work was completed by-Wong 7 to re­ cover lead from a galena concentrate with

Extraction of Gold from a Low-Grade Double Refractory Gold ...

The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was only 11.75%. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed.

PDF Gold recovery of refractory sulfide concentrates using ...

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct . cyanidation applied, still exists ... capable of extracting gold from the ore. The .

Refractory Gold Mining SGS

Gold in sulfide minerals could be liberated by oxidization using techniques such as roasting, high temperature pressure leaching or bacterial leaching. Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides.

US5074910A - Process for recovering precious metals from ...

The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at a temperature between 300 and 600 C. while stirring.

Gold processing Britannica

Endogenetic gold ores include vein and lode deposits of elemental gold in quartzite or mixtures of quartzite and various iron sulfide minerals, particularly pyrite FeS 2 and pyrrhotite Fe 1-x S . When present in sulfide ore bodies, the gold, although still elemental in form, is so finely disseminated that concentration by methods such as ...

How to Extract Precious Metals From Sulfides Sciencing

Extract sulfide ore deposits from the ground and place in to the crusher to mince ore from 5 to 50 micrometers. Crushing begins the separation process by preparing the ore to be floated in water. First, the ore is crushed using a gyratory crusher to reduce the ore to 6-inch diameter pieces.

US7785395B2 - Method for the recovery of gold from sulphide ...

The free gold that remains undissolved is separated by means of gravity separation methods. After gravity separation, additional comminution is carried out, after which the sulphide minerals are decomposed and the gold-containing solution or residue is routed to the concentrate leaching circuit.

Sulfur radical species form gold deposits on Earth PNAS

gold; sulfur; ore deposit; hydrothermal fluid; trisulfur ion; The formation of gold deposits on Earth requires aqueous fluids that extract gold from minerals and magmas and transport and precipitate the metal as economic concentrations in ores that are three to six orders of magnitude larger than the Au mean content ∼0.001 ppm of common crustal and mantle rocks 1 ...

Gold Extraction From Antimony Ore

Antimony-bearing sulfide gold ore refers to the antimony-bearing sulfide or gold ore in which antimony minerals exist independently.this type of ore is generally difficult to be extracted by amalgamation and cyanidation directly, so flotation, roasting, and cyanidation gold extraction processes are often used to extract this type of gold.

Froth Flotation Method - JXSC Machine

The vast majority of polymetallic sulphide ores containing gold and silver are treated by this method. When flotation of such ores, gold and silver enter into the copper concentrate or lead concentrate closely associated with them. The products are called copper, gold and silver concentrate or lead, gold and silver concentrate, etc.

Cyanide Leaching Of Gold - Mine Engineer.Com

Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution. 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 Mining Process - Newmont Corporation - About Us

Refractory ore resists normal processing methods as the high sulfide minerals trap gold particles, making it difficult for the cyanide to reach the gold and leach it. Heating. To leach gold from refractory ore, it must be subjected to high temperature, high pressure and/or oxygen. Newmont treats refractory ore in two ways: by using an autoclave ...

How gold is made - history, used, parts, procedure, industry ...

In the last few years, several companies have focused on extracting gold from sulphide ore rather than oxide ore. Previous techniques made such extraction difficult and expensive, but a newer technique called bioleaching has made extraction more feasible.

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