two stage microbial leaching of copper and precious metals

two stage microbial leaching of copper and precious metals

Two-stage microbial leaching of copper and precious

After copper leaching, the ore was subjected to a combined alkaline chemico-biological leaching to extract the precious metals using solutions containing thiosulphate and amino acids of microbial ...

TWO-STAGE MICROBIAL LEACHING OF COPPER AND

2007-3-3 · Groudev S. et al. TWO-STAGE MICROBIAL LEACHING OF COPPER AND PRECIOUS METALS Table 1. Data about the chemical and mineralogical analysis of the ore used in this study Component Content Component Content Copper 0.32 % Silver 9.1 g/t Gold 4.2 g/t Gold phases (in % from the total gold content): Total sulphur Sulphide sulphur Sulphate sulphur

Two-stage microbial leaching of a refractory gold-bearing ...

1996-7-1 · Two-stage microbial leaching of a gold-bearing ore TABLE 2 Extraction of Precious Metals by Leaching of Ore Samples Pretreated by Chemolithotrophic Bacteria 711 Column Test Number Pretreatment stage, months Residual sulphide sulphur, % Sulphide oxidation, % Metals Extraction, % Au Ag 1 0 0.80 0 15.4 10.7 2 2 0.56 30.5 49.5 39.2 3 4 0.46 42.8 68 ...

A Review on Chemical versus Microbial Leaching of ...

The authors proposed a two-step alkaline leaching process by simply using glycine for base metal leaching, and a mixture of glycine and sodium cyanide (NaCN) for precious metal leaching in the first and second stages, respectively. The recoveries of base metals were 80.9%, 99.1%, 85.6%, 72.5% and 6.5% for Zn, Al, Pb, Cu and Ni, respectively.

Bacterial leaching of copper, zinc, nickel and aluminum ...

2021-7-12 · E-waste is an important secondary source of precious metals. Especially discarded printed circuit boards (PCBs) contain high concentrations of precious metals. In recent years, the bacterial leaching was more widely preferred due to its low environmental impact and cost in the recovery of these precious metals. In this study, a PCBs-adapted pure culture of A. ferrooxidans, A. thiooxidans and ...

Bacterial Leaching - Indian Academy of Sciences

2019-4-9 · ever for ore concentrates and precious metals they are being considered actively. Bioleaching of Copper Biological copper leaching is practiced in many countries in­ cluding Australia, Canada, Chile, Mexico, Peru, Russia and the United States of America. Copper recovery from bioleaching accounts for about 25% of the world copper production.

Microbial Leaching (Bioleaching, Biomining ...

Microbial leaching is the process by which metals are dissolved from ore bearing rocks using microorganisms. For the last 10 centuries, microorganisms have assisted in the recovery of copper dissolved in drainage from water. Thus biomining has emerge

Bacterial leaching of ores and other materials

2018-2-27 · Bacterial ore leaching can be applied to extract heavy metals from low grade ores, industrial wastes and other materials on an industrial scale by different procedures: dump leaching, in situ leaching, tank leaching, leaching in suspension. Sulfidic copper

An Alkaline Glycine-Based Leach Process of Base and ...

2019-8-9 · Ideally, extraction of precious and base metals from PCBs can be achieved in two stages of selective base metals extraction followed by leaching and recovery of precious metals in the second stage. The most common reagents used for base metals extraction are ammonia, sulfuric acid and chloride [17,18,19].

Bioleaching: Introduction, Methods, Application, Copper ...

2021-11-19 · Bioleaching: Introduction, Methods, Application, Copper, Microorganisms, and Processes! Introduction to Bioleaching: Leaching process was first observed in pumps and pipelines installed in mine pits containing acid water. This process was later on employed for recovering metals from ores containing low quantity of the metal. Presently certain metals from sulfide ores and other ores are ...

Bacterial leaching of copper, zinc, nickel and aluminum ...

2021-7-12 · E-waste is an important secondary source of precious metals. Especially discarded printed circuit boards (PCBs) contain high concentrations of precious metals. In recent years, the bacterial leaching was more widely preferred due to its low environmental impact and cost in the recovery of these precious metals. In this study, a PCBs-adapted pure culture of A. ferrooxidans, A. thiooxidans and ...

A Review on Chemical versus Microbial Leaching of ...

The authors proposed a two-step alkaline leaching process by simply using glycine for base metal leaching, and a mixture of glycine and sodium cyanide (NaCN) for precious metal leaching in the first and second stages, respectively. The recoveries of base metals were 80.9%, 99.1%, 85.6%, 72.5% and 6.5% for Zn, Al, Pb, Cu and Ni, respectively.

[A two-stage technology for bacterial and chemical ...

2009-1-1 · A two-stage technology for bacterial and chemical leaching of nonferrous metals in a specifically designed laboratory unit has been proposed. At the first stage of leaching, ferric iron formed during the second stage of oxidation of Fe2+ ions by mesophilic chemolithotrophic microorganisms was

Two-Stage Agitation Leaching of Old Flotation Tailings ...

Two-stage leaching at pulp density of 40% with water made it possible to extract 31 and 64% of copper and zinc, respectively. It was shown, that second stage did not allow to increase non-ferrous metals extraction but made it possible to obtain solution containing 11g/L of ferric iron. This pregnant solution was used for oxidative leaching of ...

Innovations in Copper: Mining & Extraction: Producing ...

2021-8-12 · BacTech Enviromet Corp., in conjunction with Mintek, 14 has developed proprietary technologies for the high temperature leaching of copper concentrates. Working in conjunction with Industrias Penoles SA de CV, one of Mexico's largest and

Biotechnology for Metal Extraction, Mineral Beneficiation ...

2012-11-23 · industrial scale. The recovery of several other metals are also possible by such methods. In-situ, dump, heap and bioreactor leaching are the techniques practised in microbial leaching. In particular, heap leaching in the presence of bacteria is a very useful method to recover copper, uranium and gold from low grade ores and tailings.

Copper Mining and Processing: Processing Copper Ores ...

2021-11-18 · Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different ...

Bacterial leaching of ores and other materials

2018-2-27 · Bacterial ore leaching can be applied to extract heavy metals from low grade ores, industrial wastes and other materials on an industrial scale by different procedures: dump leaching, in situ leaching, tank leaching, leaching in suspension. Sulfidic copper

Potential impact of microbial consortia in biomining and ...

The wet leaching involves the crushing of material and its dilution in confined tank. By using bioreactor, the recovery of metal is increased, but this requires high cost. This method is currently applied to the oxides of ores. However, the precious metals are actively extracted by

Progress, Challenges, and Perspectives of Bioleaching for ...

2021-5-7 · The accumulation of mine tailings on Earth is a serious environmental challenge. The importance for the recovery of heavy metals, together with the economic benefits of precious and base metals, is a strong incentive to develop sustainable methods to recover metals from tailings. Currently, researchers are attempting to improve the efficiency of metal recovery from tailings using bioleaching ...

TwoStep Leaching of Valuable Metals from Discarded

2020-1-31 · Two-Step Leaching of Valuable Metals from Discarded Printed Circuit Boards, and Process Optimization Using Response Surface Methodology Arda Işıldar1,2*, Eldon R Rene1, Eric D van Hullebusch 1,2 and Piet N L Lens1,3 1Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Post Box 3015, 2601 DA Delft, The Netherlands

ASSESSING A TWO-STAGE HEAP LEACHING PROCESS

2017-1-30 · (Mwase et al., 2011) revealed the effectiveness of using a two-stage heap leaching process to extract PGMs and BMs. The first stage was a bioleach utilising thermophilic microorganisms, operating at a temperature of 65oC, to extract BMs from the concentrate material. Extractions of 52% copper and 95% nickel were achieved within 4 weeks.

Innovations in Copper: Mining & Extraction: Producing ...

2021-8-12 · BacTech Enviromet Corp., in conjunction with Mintek, 14 has developed proprietary technologies for the high temperature leaching of copper concentrates. Working in conjunction with Industrias Penoles SA de CV, one of Mexico's largest and

BIOREEs | IUE - TUHH

A two-stage process based on bioleaching of base metals followed by leaching of precious metals and REEs will be developed for the biohydrometallurgical treatment of e-waste. However, further research is required to evaluate the deportment of REEs during such a two-stage process or to develop a suitable bio/-leaching process or to refine ...

Methods of Metal Recovery by Microorganisms (2 Methods)

2021-11-18 · In microbial leaching (bioleaching), metals can be extracted from large quantities of low grade ores. Although recovery of metals (e.g. copper) from the drainage water of mines has been known for centuries, the involvement of microbes in this process was recognized about 40 years ago.

Copper Mining and Processing: Processing Copper Ores ...

2021-11-18 · Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different ...

Bacterial leaching of ores and other materials

2018-2-27 · Bacterial ore leaching can be applied to extract heavy metals from low grade ores, industrial wastes and other materials on an industrial scale by different procedures: dump leaching, in situ leaching, tank leaching, leaching in suspension. Sulfidic copper

Potential impact of microbial consortia in biomining and ...

The wet leaching involves the crushing of material and its dilution in confined tank. By using bioreactor, the recovery of metal is increased, but this requires high cost. This method is currently applied to the oxides of ores. However, the precious metals are actively extracted by

Progress, Challenges, and Perspectives of Bioleaching for ...

2021-5-7 · The accumulation of mine tailings on Earth is a serious environmental challenge. The importance for the recovery of heavy metals, together with the economic benefits of precious and base metals, is a strong incentive to develop sustainable methods to recover metals from tailings. Currently, researchers are attempting to improve the efficiency of metal recovery from tailings using bioleaching ...

US4497778A - Microbial leaching of sulphide-containing ...

A process of extracting metals from a material containing at least 10% by weight of pyrite and selected from the group consisting of ores containing sulphide, concentrates of such ores and mixtures of such ores and/or concentrates by microbial leaching which comprises roasting the material before the microbial leaching to convert part of the pyrite to pyrrhotite and thus remove part of the ...