Sulphide Ore Refractory

Sulphide Ore Refractory

Gold extraction - Wikipedia

2018-11-15 · 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.

Characterizing Gold in Refractory Sulfide Gold Ores and ...

2017-8-29 · Thus, the presence of chloride, in the ore itself or in the process water, can greatly complicate the hydrometallurgical processing of refractory sulfide gold ores. Roasting is a viable alternative in such circumstances as roasting oxidizes the carbon and volatilizes much of the chloride in the ore. References 1. L.J. Cabri et al.,

Refractory Gold Ore Treatment Methods

2018-12-4 · 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

Sulphide Gold Ore Treatment by Leaching and

2018-12-5 · 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.

INFLUENCE OF PRE-AERATION ON CYANIDE LEACHING

2015-5-6 · refractory sulphide gold-silver ore. First, the characterization of the ore sample was initially accomplished by mineralogical analysis. Then, fundamental industrial cyanidation parameters such as leaching duration, cyanide concentration, particle size, and solids ratio were tested. ...

extraction of gold from sulphide ore -

Improved gold and silver extraction from a refractory antimony ore by ... Cyanide leaching of the ore consistently resulted in low extraction of gold (49%) and silver (18%) confirming the refractory nature of the ore.

HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND

2003-11-17 · AND TREATMENT OF REFRACTORY SULPHIDE ORES ... In that method, known as Patera’s process, the ore was first roasted in a chloride atmosphere and just after a thiosulphate leaching was used to recover gold and silver (Zipperian et al. 1988).

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

2008-3-4 · Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment processes for specific gold ores. We at Hazen Research have had the opportunity to participate in the development and application of a number of gold ore processes and to review others'

Recovery Refractory Resources - sgs

2017-2-1 · sulphide flotation, often precede the pre-treatment processes. By reducing the volume of ore going in to the pre-treat-ment process, the size of the equipment needed is also decreased. “The infrastructure needed for refractory gold processing varies depending on the method chosen,” says Rachel Bridge, metallurgist at Hatch. “The

ALTA Gold 2012 E-Doc - albionprocess

2017-12-20 · Flotation test work on high throughput Ore B indicated that gold can also be concentrated to an extent by concentrating the sulphide component in the ore to mass pulls of 15 to 30 wt%, with gold recovery of 60 to 70%. Maximum Au, Ag and sulphide recoveries of 70%, 45% and 89%

Improved gold and silver extraction from a refractory

2014-5-22 · Improved gold and silver extraction from a refractory antimony ore by pretreatment_/__。 ...

Sulphidic refractory gold ore pre-treatment by

In sulphidic refractory gold ores, fine gold particles may be highly disseminated and locked up in sulphide minerals such as pyrite and arsenopyrite. Hence, pre-treating processes are necessary to extract gold for further processing methods like cyanidation.

Thiosulphate leaching of silver from an arsenical ...

The ore is essentially double refractory in character since silver occurs as both physically encapsulated silver sulphide and silver-bearing complex arsenic/antimony/base metal minerals/phases. Effect of ultra-fine grinding on the rate and extent of thiosulphate leaching of silver was demonstrated.

HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND

2003-11-17 · AND TREATMENT OF REFRACTORY SULPHIDE ORES ... In that method, known as Patera’s process, the ore was first roasted in a chloride atmosphere and just after a thiosulphate leaching was used to recover gold and silver (Zipperian et al. 1988).

Sulphide Gold | Gekko

Pre-concentration of coarse 350 – 500 micron sulphide-associated gold ore, using the InLine Pressure Jig, is required to reject gangue from the high value material. The IPJ , a classic pre-concentration device, is effective in gangue rejection prior to further processing of valuable gold-bearing material.

US8029598B2 - Method for recovering metal values

A method for recovering metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulfide minerals from the separated fines and adding the concentrate to the heap, bioleaching the heap to thereby oxidize iron ...

NEW DEVELOPMENTS IN CHARACTERIZATION OF

Refractory sulphide gold ores have been of intere st to process and other mineralogists fo r nearly a century. The earliest account of gold oc curring “invisibly” in sulphides wa s by Bürg [1 ...

Refractory Gold | Mining | SGS

The problems that result from refractory gold are caused by: Physical encapsulation of disseminated gold particles (usually less than a few micrometers in size) within a mineral that is unreactive and impervious to leaching ; Chemical interference by one or more of the ore constituents in the cyanide leaching process; Physical encapsulation

Processing of Konkola copper concen- trates and

2009-8-27 · The CRO ore will be mined from existing rock dumps and will be transported approximately 6 km to the existing Nchanga East Mill, where it will be crushed, milled and pumped to the pre-leach thickeners of the TLP. The quantity of CRO ore treated will be dictated by the acid availability from processing of the KDMP sulphide concentrates. This

US5262136A - Recovery of gold and silver from

A method of recovering precious metals from a silver bearing ore containing polybasite, pearcite, pyrargyrite, tetrahedrite or argentite by mixing the ore with an alkali metal or alkaline earth metal peroxide in slurry or solid, leaching the ore with a cyanide solution, and recovering the precious metals from the cyanide solution.

TWO-STAGE COMBINED BIOLOGICAL AND CHEMICAL

A sulphide ore containing 4.1 g/t gold most of which finely disseminated in pyrite, was subjected to two-stage processing for extracting these precious metals.

US5262136A - Recovery of gold and silver from

A method of recovering precious metals from a silver bearing ore containing polybasite, pearcite, pyrargyrite, tetrahedrite or argentite by mixing the ore with an alkali metal or alkaline earth metal peroxide in slurry or solid, leaching the ore with a cyanide solution, and recovering the precious metals from the cyanide solution.

gold sulfide ore oxidation - perkinspreschool

2018-2-19 · Sulphide Gold Ore Treatment by Leaching and Flotation Process. Jan 11, 2018 Problem with gold recovery from sulphide ore: How may a mill get the very low gold content in the tailings particularly on an oxidized ore.

sulphide mineral flotation gold - bellocibo.co.za

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. Inquire Now; Electrochemistry of Flotation of Sulphide Minerals

HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND

2003-11-17 · AND TREATMENT OF REFRACTORY SULPHIDE ORES ... In that method, known as Patera’s process, the ore was first roasted in a chloride atmosphere and just after a thiosulphate leaching was used to recover gold and silver (Zipperian et al. 1988).

US8029598B2 - Method for recovering metal values

A method for recovering metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulfide minerals from the separated fines and adding the concentrate to the heap, bioleaching the heap to thereby oxidize iron ...

Hydrometallurgy of gold: New perspectives and

2018-11-24 · The aim of this study consist of the determining of grinding parameters to be effective on ultrafine grinding of Akoluk gold-silver ore determined its refractory characteristic in previous studies.

Advances in high-temperature heap leaching of refractory ...

2012-12-13 · in the ore is therefore of primary importance, as well as the need to generate suitable Advances in high-temperature heap leaching of refractory copper sulphide ores by S.W. Robertson*, P.J. van Staden*, and A. Seyedbagheri* Synopsis Acid heap leaching has been extensively applied to

Extraction of gold from an Indian low-grade refractory gold ore ...

2010-12-2 · Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation an... No other sulphide mineral or any native gold was observed. The pyrite in ...

Pretreatment Process on Refractory Gold Ores with As

Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are 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.

Gold Leaching from Refractory Ores—Literature Survey

2017-6-11 · refractory gold-bearingores and the thiourea containing barren liquor can be reused for the treatment of fresh gold ore, thus reducing the thiourea inventory

Pre-Oxidation of a Refractory Sulphide Gold Ore in ...

2018-12-3 · The Eldorado Gold Corp. has developed a method of treating a hard-to-process ore from a mine in China in order to increase their recovery of gold. While this process has proven to be effective, more research is needed on the exact method in which this technique works on a very small-scale and detailed basis. The research that will be undertaken involves testing a number of different types of ...

Effect of Pretreatment of Sulfide Refractory Concentrate ...

2013-12-24 · A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold recovery by direct cyanide leaching, after fine grinding of mineral indicates a refractory mineral [1]. The refrac- tory ore must be destroyed or attacked by chemical

A Novel Technique for Silver Extraction from Silver ...

A Novel Technique for Silver Extraction from Silver Sulphide Ore S. AYATA, H. YILDIRAN Ege University, Science Faculty, Chemistry Department, 35100, Bornova, Izmir-TURKEY_ Received 07.04.1999 A novel technique for silver extraction from Ag 2S is described. The method utilizes thiosulphate as complexing reagent and the redox reaction between SO ...

An Integrated Mineralogical Approach to the Biooxidation ...

2018-6-7 · processing applications including the recovery of refractory gold associated with sulphide minerals such as pyrite and arsenopyrite. Each gold ore possesses distinctive and unique mineral composi- tions and textural associations. Consequently, each ore has its own degree of refractoriness which must be considered in order to

Extraction of gold from an Indian low-grade refractory gold ore ...

2010-12-2 · Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation an... No other sulphide mineral or any native gold was observed. The pyrite in ...

Leaching of a Gold Bearing Partially Roasted Sulphide ...

2003-4-7 · gold from its ores. In the case of refractory ores containing complex minerals, gold dissolution is not a simple process and its rate becomes depressed after a certain time of cyanidation3. Mineralogical identification of the ore and diagnostic leaching are alternative methods for establishing and designing a metallurgical flowsheet for ...

Rcovery of gold in pyritic ores - Mine Engineer.Com

2013-1-13 · Gravity concentration tends to recover the pyrite with the gold, and only removes the lighter minerals, such as quartz, from the ore. The most difficult particles to gravity concentrate are the fines, and 75 microns to 2 microns are definitely very fine.

Sulfides, Selenides and Tellurides: rebellious and ...

2012-4-18 · In many locations where they had initially been recovering 90% of the assay values processing oxidized surface ore, with the rebellious sulfide ores they were recovering less than 50%. The rest of the precious metals in their ore simply flowed uselessly out

Kyzyltash | Chaarat Gold Holdings Limited | Chaarat

The Kyzyltash ore-body is suitable for underground mining, with an existing adit driven into high grade mineralisation in the heart of the deposit. The Kyzyltash orebody is refractory in nature, requiring oxidation of the ore to recover gold. The refractory nature is due solely to sulphide mineralization.

Pretreatment by electrolytic or oxidative leaching for ...

2017-8-27 · 410 Recovery of gold and silver from refractory sulphide concentrates thiosulfate, halogen and ammoniacal lixiviants [11,12]. Biological oxidative processes have also treen proposed [13] but their application still seems rather limited for use as a general hydrometallurgical treatment.

Advances in high-temperature heap leaching of refractory ...

2012-12-13 · in the ore is therefore of primary importance, as well as the need to generate suitable Advances in high-temperature heap leaching of refractory copper sulphide ores by S.W. Robertson*, P.J. van Staden*, and A. Seyedbagheri* Synopsis Acid heap leaching has been extensively applied to

Biooxidation of Refractory Gold Sulfide Concentrate

Results of research on technological processes for treatment of refractory gold-arsenic ores using bioleaching of concentrates are presented. In October 2001 the first line of bioreactors on Mill-2 began operation with projected throughput of 3 million tons a year. In July 2007 Mill-3 began operation with projected throughput of 5 million tons a year.

copper extraction from sulphide ores by chloride -

2017-6-23 · Lead Sulphide, Lead Sulphide Suppliers and Manufacturers at . copper extraction from sulphide ores by chloride offers 63 lead sulphide products. About 17% of these are sulfide, 17% are mineral separator, and 11% are other metals & metal products. A wide.

Leachox™ Refractory and Sulphide Gold Process |

Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns. The gold is normally present in refractory gold sulphide ores containing mainly pyrite, arsenopyrite or pyrrhotite and occurs in both the chemically bonded ...

Co-intensification of gold leaching with heavy metals and ...

2010-5-18 · types of materials which were classified as a refractory sulphide gold concentrate, an easily leachable sulphide gold concentrate, and a low grade oxide gold ore according ...

Sulfides, Selenides and Tellurides: rebellious and ...

2012-4-18 · In many locations where they had initially been recovering 90% of the assay values processing oxidized surface ore, with the rebellious sulfide ores they were recovering less than 50%. The rest of the precious metals in their ore simply flowed uselessly out

Sulphide Gold | Gekko

Pre-concentration of coarse 350 – 500 micron sulphide-associated gold ore, using the InLine Pressure Jig, is required to reject gangue from the high value material. The IPJ , a classic pre-concentration device, is effective in gangue rejection prior to further processing of valuable gold-bearing material.

Leaching refractory gold ores - Johannesburg

1985-12-17 · A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of

Processing of Konkola copper concen- trates and

2009-8-27 · The CRO ore will be mined from existing rock dumps and will be transported approximately 6 km to the existing Nchanga East Mill, where it will be crushed, milled and pumped to the pre-leach thickeners of the TLP. The quantity of CRO ore treated will be dictated by the acid availability from processing of the KDMP sulphide concentrates. This