bioleaching of gold concentrates

Development of a mathematical model for continuous tank bioleaching …

concentrates. Tank bioleaching has been used for the recovery of gold from arsenical gold-bearing concentrates since 1984 (Dew et al., 1997) and as of December 2005 there were 11 operating tank bioleaching plants worldwide (Harvey, 2005). There is a need for ...

Bioleaching of Gold Ore Example | Graduateway

 · Bioleaching is usually applied to refractory ore and concentrates in which the gold is finely disseminated in sulfide minerals. These sulfide minerals trap the gold and it cannot be liberated satisfactorily by crushing and grinding alone.

Biohydrometallurgy

Large scale heap bioleaching promotes recovery of target metals from copper ores (copper) and from polymetallic sulfides (currently nickel and zinc, and potentially copper, cobalt and uranium). Bioreactors for treatment of gold concentrates have been used in industry for over thirty years, with some reactors of over 1000 m 3 currently in operation.

(PDF) Bioleaching of Arsenic-Rich Gold Concentrates by …

Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora before and after Mutation

Biotechnology for Metal Extraction, Mineral Beneficiation and …

uranium and gold from low grade ores and tailings. The contribution of bioleaching is estimated to be approximately 15, 13 and 25% of the total world production of copper, uranium and gold. For gold-containing refractory sulfide concentrates, bioreactor

Biotechnology in gold processing

yield gold-enriched sulphide concentrates. (c) Reactor bioleaching of concentrates under controlled conditions. (d) Solid-liquid separation. (e) Lime treatment of bio- leached residues and cyanide leaching. (f) Gold recovery from cyanide leach liquor ...

Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora …

the bacteria for arsenic-rich gold concentrates bioleaching [11, 12]. In this paper, the bacterial flora enriched in acid mine drainage of Dexing copper mine, Jiangxi Province, China, was used to ...

Bioleaching Carbonaceous Gold Ores

 · gold recovery to only 59.0%, demonstrating that both bioleaching and CIL are required to obtain high gold recoveries from this ore. Because greater iron extraction was achieved from the ore which was bioleached at 5% pulp density, it is likely that CIL-cyanidation would have yielded higher gold recovery from this material; this was not tested because there was insufficient material available.

ALTA MetBytes

Bioleaching has finally moved into the treatment of nickel sulphide ore and concentrates, with commercial heap and tank systems now in commercial operation in Finland, and a commercial tank system planned for Western Australia.

Bioleaching of Gold Ore Essay

 · Bioleaching has been applied to copper and uranium deposits for many years, but more recently has been applied to gold ore refractory and refractory concentrates. This process involves the oxidation of sulfide, ferrous, and sometimes carbon containing minerals in order to liberate the gold …

Reverse osmosis removal of arsenic residues from …

 · Gold recovery from sulphide concentrate Fig. 2 shows a generalised flowsheet for treating refractory gold sulphide concentrate. It includes bioleaching of iron/arsenic sulphide concentrate to liberate gold and carbon-in-pulp cyanidation to recover gold (Gupta and Mukherjee, 1990b).

Studies on the bioleaching of refractory concentrates

Bioleaching is now an established technology for the pre-treatment of refractory gold ores and concentrates and the leaching of whole-ore copper heaps. In many cases, it offers economic, environmental and technical advantages over pressure oxidation and 1,2

Bioleaching technology in minerals processing

bioleaching of refractory gold concentrates has since found widespread application in South America, Asia, Africa and Australia. An industrial bioleaching plant for the treatment of a refractory gold concentrate. At the Beaconsfield Gold Mine in Tasmania ...

Influence of surfactants on bioleaching of arsenic …

To shorten the bioleaching cycle of arsenic-containing gold concentrate, surfactants were used to promote the interaction between bacteria and ore to increase the arsenic leaching rate. Three...

Studies on the bioleaching of refractory concentrates

The heap bioleaching technologies are successfully used today in the extraction of gold from refractory sulfide-bearing ores and concentrates (Jordan et al., 1996). ...

(PDF) Bioleaching of Gold: An alternative green mining …

Bioleaching, gold, Acidobacillus ferrooxidans, Acidobacillus thiooxidans, ore. Introduction ... and Concentrates in Order to Increase Au and Ag Recovery Rate in H ydrometallurgical Extraction Process.

(PDF) Bioleaching of Arsenic-Rich Gold Concentrates by …

Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora before and after Mutation Roger Terry Related Papers Mineral and iron oxidation at low temperatures by pure and mixed cultures of acidophilic microorganisms By Bestamin Ozkaya c11.pdf By ...

Bioleaching of Arsenic-Rich Gold Concentrates by …

During bioleaching of arsenic-rich gold concentrates, the density of the mutant bacterial cells reached to 1.13×108 cells/mL at 15 days, more than 10 times compared with that of the original culture. The extraction of iron reached to 95.7% after 15 days

The bioleaching and processing of refractory gold ore | …

The bioleaching and processing of refractory gold ore Nicholas S. Lynn JOM volume 49, pages 24 – 26 (1997)Cite this article 440 Accesses 4 Citations Metrics details ...

Reverse osmosis removal of arsenic residues from …

 · The concentrates contain high levels of arsenate, which is dissolved during bioleaching and largely co-precipitated with ferrihydrite and gypsum during neutralisation of the leach liquors. This paper considers RO management of residual concentrations remaining after the co-precipitation (<0.1 mg/L As) for groundwater protection and combined RO and ion exchange (IX) treatment for potable ...

Bioleaching of Refractory Arsenical Pyrite Concentrates to …

A thermophilic species, Sulfolobus acidocaldarius, strain BC, has been used for the bioleaching of refractory arsenical pyrite concentrates to enhance Au extraction in cyanidation. The results of l ... 1991 (English) In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 20, no 6, p. 346-350 Article in journal (Refereed) Published

Microbes and mineral recovery: Bioleaching of copper, gold and …

Bioleaching is the extraction of a metal from sulfide ores or concentrates using materials found native to the environment. Bioleaching is the commercialization of the ability of certain bacteria and archaea, found in nature, to catalyze the oxidation of sulfide

Gold Ore

Steps Involved in the Determination of Bioleaching Potential of Gold-Bearing Ores or Concentrates. Gold ores are classified "free-milling" and "refractory" based on their response to cyanide dissolution. Bioprocessing can be used to treat refractory gold-bearing sulfide ores as well as carbonaceous gold …

Bioleaching: metal solubilization by microorganisms | …

 · Abstract Bioleaching is a simple and effective technology for metal extraction from low-grade ores and mineral concentrates. Metal recovery from sulfide minerals is based on the activity of chemolithotrophic bacteria, mainly Thiobacillus ferrooxidans and T. thiooxidans, which convert insoluble metal sulfides into soluble metal sulfates.

Studies on the bioleaching of refractory concentrates

Bioleaching is now an established technologyfor the pre-treatment of refractory gold oresand concentrates and the leaching of whole-ore copper heaps. In many cases, it offerseconomic, environmental and technicaladvantages over pressure oxidation androasting1,2. However, in order for bioleachingto compete successfully with other pre-treatment processes it needs to be optimizedwith regard to the parameters that affect theprocess. Furthermore, there is a need formechanistically based kinetic models that canbe used to derive performance equations foruse in the design, optimization and control ofbioleaching …

BIOLEACHING

Bioleaching provides additional mine life of three years processing refractory arsenic gold concentrates from the mine. The mine was closed in 1997 due to low gold prices, but BacTech had its first successful commercial application.

(PDF) AUTOCLAVE TECHNOLOGY OF REFRACTORY GOLD …

Bacterial leaching is widely used by gold companies as a method of processing of refractory gold concentrates. A Mintek perspective of the past 25 years in minerals bioleaching ...

Bioleaching of Gold Ore Example | Graduateway

BIOLEACHING

The BIOX® Process for Biooxidation of Gold-Bearing …

Morin D, 011iver P, Toromanoff I et al. Bioleaching of gold refractory arsenopyrite rich sulfide concentrate: laboratory and pilot case studies. In: Gaskell PR, ed. EPD Congress Proceedings. The Minerals, Metals and Materials Society, 1991: 577–589.

BIOLEACHING & LEACHING: DEFINITION, IMPORTANCE …

 · It is the extraction of a metal from sulfide ores or concentrates using natural materials such as water and microbes. Bioleaching is leaching where the extraction of metal from solid minerals into a solution is facilitated by the metabolism of certain microbes generally known as bioleaching microbes (rock-eating microbes).

Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora …

for arsenic-rich gold concentrates bioleaching. The results in terms of changes in the density of cells, pH value, and extractionofelementsFeandAswereshowninFigure5.

Mission 2015: Bioleaching

To study the feasibility of a potential bioleaching project, we used the BIOX project, a process for the treatment of refractory gold concentrates, as an example (D.E. Rawlings). The bio-oxidation section contributes to more than 50 percent of the total BIOX™ plant equipment cost.

(PDF) Bioleaching of Gold: An alternative green mining …

After 10 days of bioleaching, the initial concentration increased from 13% to 97% from. cyanidation technique. The price of the gold is volatile in the world market and theas. Bioleaching offers ...

Bioleaching gold recovery

 · Bioleaching gold recovery. This is an ancient process which involves the alloying of the gold particles with metallic mercury to form amalgam and then the separation of the gold from the mercury by heating in Pressure oxidation: Utilizes oxygen and heat under pressure in a liquid medium, to effect. oxidation of sulfur by way of a controlled ...

(PDF) Bioleaching of Arsenic-Rich Gold Concentrates by …

During bioleaching of arsenic-rich gold concentrates, the density of the mutant bacterial cells reached to 1.13 × 10(8) cells/mL at 15 days, more than 10 times compared with that of the original ...

Thermophilic Bioleaching of Chalcopyrite Concentrates with.

Thermophilic Bioleaching of Chalcopyrite Concentrates with GEOCOAT Process Todd J. Harvey GeoBiotics, LLC [email protected] Nick Holder, Tracey Stanek Lakefield Research Africa (PTY) Ltd [email protected] , [email protected]

bioleaching of gold concentrates

Extensive bioleaching work is mainly done only for the Cu and gold extraction from concentrates. Bioleaching of bulk concentrate is at the developing stage. The present work deals with the formulation of an economic medium for the bioextraction of metals from GMDC polymetallic bulk concentrate.