leaching process bacterial

Copper Mining Using Acidothiobacillus microbewiki

Afterward the dissolved copper ions are transformed to solid copper metal through a process called electrowinning that uses an electric current to reduce the dissolved metal and deposit it onto a cathode at which point the solid elemental copper metal can be employed for its many uses Siddiqui et al 2009 Mechanism of Bacterial Leaching

Bacterial Leaching

Bacterial Leaching Biotechnology in the Mining Industry Preston Devasia and K A Natarajan Bacterial leaching is the extraction of metals from their ores using microorganisms Microbial technology offers an eco nomic alternative for the mining industry at a time when high grade mineral resources are being depleted Why Bacterial Leaching

Leaching chemistry Wikipedia

Leaching is the process of a solute becoming detached or extracted from its carrier substance by way of a solvent Leaching is a naturally occurring process which scientists have adapted for a variety of applications with a variety of methods Specific extraction methods depend on the soluble characteristics relative to the sorbent material such as concentration distribution nature and size

Bacterial Leaching SGS

Bacterial leaching is an established method of treating refractory gold and base metal ores or concentrates SGS Minerals Services has undertaken testing SGS s expertise with the BIOX® process mesophyllic bacteria spans amenability testing to plant commissioning

Microbial Bioremediation Boundless Microbiology

The Leaching Process Bacteria perform the key reaction of regenerating the major ore oxidizer which in most cases is ferric iron as well as further ore oxidation The reaction is performed at the bacterial

Bacterial Leaching Core Group

Bacterial Leaching Core has extensive experience in testwork relating to bacterially assisted leaching of base metal sulphide and refractory gold ores Test programmes carried out have included use of a range of bioreactors for oxidation of concentrates and aerated columns for heap leach simulation studies

Bioleaching Wikipedia

 · The Leaching Process Bacteria perform the key reaction of regenerating the major ore oxidizer which in most cases is ferric iron as well as further ore oxidation The reaction is performed at the bacterial cell membrane In the process free electrons are generated and used for the reduction of oxygen to water which produces energy in the

Sociedad Minera Pudahuel bacterial thin layer leaching

The thin layer leaching process originally conceived and developed for leaching oxide ores has been successfully adapted to bacterial leaching of mixed and secondary sulphide ores The process is currently being applied at the Socicdad Minera Pudahuel Lo Aguirre Plant

Bioleaching Introduction Methods Application Copper

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

Extraction of metals from electronic waste by bacterial

The paper presents the results of laboratory tests of bacterial leaching of metals from electronic scrap It describes the mechanisms of this process and the factors influencing the chemical reaction

Bacterial leaching of ores and other materials

In the U S A 200 000 to 250 000 t of copper are produced annually by bacterial leaching equivalent to 20 25 of the total copper production In the whole world about 5 of the total copper production is obtained by bacterial leaching Bacterial leaching is a very slow process

Producing Copper Nature s Way Bioleaching

7 Once identified however rapid steps were taken to commercialize the process Commercial application of bacterial leaching began in the late 1950s at the Kennecott Utah Copper Company s Bingham Canyon Mine near Salt Lake City Utah where it was observed that blue copper containing solutions were running out of waste piles that contained

Bacterial Leach Mining SGS

In bacterial leaching certain strains of bacteria are used to liberate gold or base metals from their mineralogical host They metabolize energy from the oxidation of ferrous iron and or sulfur compounds and free gold or metals in the process This can take place

Models of bacterial leaching ScienceDirect

B H UTTERWORTH E I N E M A N N C1CDQ 74 Models of bacterial leaching Jamal Haddadin Christophe Dagot and Michel Fick Laboratoire des Sciences du Genie Chimiquellnstitut National Polytechnique de Lorraine Vandceuvre les Nancy France Keywords Bacterial leaching modeling Thiobacillus sp Introduction The indirect mechanism is represented as follows Bioleaching is a process

Bioleaching Process Mining Fundamentals

Bioleaching or microbial ore leaching is a process used to extract metals from their ores using bacterial micro organisms The bacteria feed on nutrients in the

Microbial Leaching of Uranium Ore

leaching has been use as an alternative approach to conventional hydrometallurgical methods of uranium s extraction In the microbiological leaching process iron oxidizing bacteria oxidize pyretic phase to ferric iron an d sulfuric acid and uranium is dissolved from the ore due to sulfuric acid attack

Mechanisms of Bacterial Leaching in Metal Recovery

Bacterial leaching of minerals is a simple effective and environmental by benign technology in the treatment of sulphidic ores This method has been successfully applied for the recovery of

Bioheap Leaching Process YouTube

 · Bioheap leaching is used commercially and is based on natural bacteria s ability to leach metals from sulphide minerals The process has been performed successfully to obtain gold copper and uranium

Microbial Leaching YouTube

 · For the Love of Physics Walter Lewin May 16 2011 Duration 1 01 26 Lectures by Walter Lewin They will make you ♥ Physics Recommended for you

8 Microbial Leaching of Metals

scribes a cyclic process where a ferric sulfate sulfuric acid lixiviant solution is used for metal extraction regenerated by aeration ferrous iron oxidation by iron oxidizing organisms and reused in a next leaching stage 4 Principles of Microbial Metal Leaching 4 1 Leaching Mechanisms Mineralytic effects of bacteria and fungi on

Bacteria Leaching Low Grade Ores

What Processes Have Been Developed Kennecott s basic process is a cyclic one using ferric sulphate sulphuric acid carrying cultures of suitably tolerant bacteria in a sulphide mineral leaching stage which then passes through a regeneration stage within which the bacteria carrying solution is subject to aeration and recycled to the process

Microbial Leaching Bioleaching Biomining

Direct Bacterial Leaching In direct bacterial leaching a physical contact exists between bacteria and ores and oxidation of minerals takes place through several enzymatically catalyzed steps For example pyrite is oxidized to ferric sulphate as below Leaching Process There are three commercial methods used in leaching i Slope Leaching

Metallurgical Applications of Bacterial Leaching and

A microbiological leaching process for the removal of inorganic sulfur contained in coal is also described in this section Considerable chapters in Section III are devoted to the specific applications of bacterial leaching the optimization of the leaching conditions and process

Leaching geochemistry of soil Britannica

Leaching in geology loss of soluble substances and colloids from the top layer of soil by percolating precipitation The materials lost are carried downward eluviated and are generally redeposited illuviated in a lower layer This transport results in a porous and open top layer and a dense

Bacterial Leaching to precious metals process Top

 · Process which uses microorganisms for the recovery of precious metals from metal containing processes and streams This technology is targeted at using naturally occurring sulfate reducing bacteria for the recovery of gold and silver from ores instead of the more traditional and more toxic cyanidation process


 · Indirect bacterial leaching in this process the microbes are not in direct contact with minerals but leaching agents are produced by these microbes which oxidize the ores 7 There are three commercial process used in bioleaching a Slope leaching b Heap leaching c In situ leaching 8

Microbiological Leaching

Bacterial Nutrients The leaching bacterium is a living organism and certain nutrients are required for its metabolic systems Most importantly nitrogen is required for the production of body protein but unfortunately the bacteria are unable to utilize nitrogen from the air or nitrate nitrogen The usual source of supply is ammonium ion