Feb 01 1999 Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite FeS2 when they were grown in pure cultures and in mixed cultures with sulfur-oxidizingThiobacillus spp. Only one of the isolates strain T-24 oxidized pyrite when it was grown in pyrite-basal salts medium. However when pyrite-containing .
A study of the bioleaching of a Spanish uranium ore. Part I A review of the bacterial leaching in the treatment of uranium ores . rapid in the presence of thiobacilli than of ferric iron alone. Recent calorimetric and respirometric research 20 supports this hypothesis although the rate of . the heterotrophic bacteria can adapt to media .
Read More
Jan 01 1977 The principal organism effecting bacterial leaching of ferrous and sulphide ores is Thiobacillus ferrooxidans though other thiobacilli and other bacteria may be involved.The process depends on a direct solubilization of metal sulphides by bacterial oxidation b dissolution of metal sulphides or oxides by ferric iron produced by bacterial pyrite oxidation.
Read More
Some of these leaching organisms can directly oxidize metals through cell contact with mineral surfaces while others release complexed metals indirectly by oxidizing the sulfur and iron components of the minerals Rawlings 2005 Schippers Jozsa amp Sand 1996. While many of the iron- and sulfur-oxidizing bacteria used in biomining processes .
Read More
Jun 05 1998 Bacteria. Seven strains of iron-oxidizing heterotrophic bacteria were used in the leaching experiments. Three strains strains T-21 T-23 and T-24 were isolated either directly or indirectly via enrichment cultures from AMD from inside an abandoned pyrite mine Cae Coch in the Conwy Valley North Wales strain T-25 was isolated from an AMD stream at the derelict Parys
Read More
Feb 01 1999 Bacteria. Seven strains of iron-oxidizing heterotrophic bacteria were used in the leaching experiments. Three strains strains T-21 T-23 and T-24 were isolated either directly or indirectly via enrichment cultures from AMD from inside an abandoned pyrite mine Cae Coch in the Conwy Valley North Wales strain T-25 was isolated from an AMD stream at the derelict Parys
Read More
Oct 01 1980 Ore Leaching by Bacteria Ore Leaching by Bacteria Lundgren D G Silver M 1980-10-01 000000 The elements iron and sulfur circulate in the biosphere through specific paths from environment to organisms and back to the environment. Certain paths only involve microorganisms and it is here that biological reactions of relevance in leaching of metals from mineral ores occur 28.
Read More
Quoted operating costs 2002 based on current technology for leaching dumps and in-place ore are between US0.18 and US0.22 per pound of cathode copper which are competitive with the unit costs of smeltingrefining. Heap leaching has the additional cost of mining and transporting to the leach pad.
Read More
May 06 2005 1. Introduction. The solubilization of metals due to the action of microbes and the subsequent recovery of the metals from solution has deep historical roots that have been extensively reviewed 61 70.Similarly an indication of the number and sizes of the operations that employ microbes for the recovery of mainly copper gold cobalt and uranium has also been reviewed 61 72.
Read More
Feb 01 1999 Bacteria. Seven strains of iron-oxidizing heterotrophic bacteria were used in the leaching experiments. Three strains strains T-21 T-23 and T-24 were isolated either directly or indirectly via enrichment cultures from AMD from inside an abandoned pyrite mine Cae Coch in the Conwy Valley North Wales strain T-25 was isolated from an AMD stream at the derelict Parys
Read More
Jun 05 1998 Bacteria. Seven strains of iron-oxidizing heterotrophic bacteria were used in the leaching experiments. Three strains strains T-21 T-23 and T-24 were isolated either directly or indirectly via enrichment cultures from AMD from inside an abandoned pyrite mine Cae Coch in the Conwy Valley North Wales strain T-25 was isolated from an AMD stream at the derelict Parys
Read More
The commercial application of copper bioleaching an environmentally-friendly approach for low-grade and secondary mineral resources recycling has increased worldwide since the 2000s. As the worlds second-largest economic entity and the largest developing country China has the largest demand for metal resources significantly advancing the theory and industrial technology of copper .
Read More
Feb 01 1999 Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite FeS2 when they were grown in pure cultures and in mixed cultures with sulfur-oxidizingThiobacillus spp. Only one of the isolates strain T-24 oxidized pyrite when it was grown in pyrite-basal salts medium. However when pyrite-containing .
Read More
D.P. Kelly C.A. Jones FACTORS AFFECTING METABOLISM AND FERROUS IRON OXIDATION IN SUSPENSIONS AND BATCH CULTURES OF THIOBACILLUS FERROOXIDANS RELEVANCE TO FERRIC IRON LEACH SOLUTION REGENERATION Metallurgical Applications of Bacterial Leaching and Related Microbiological Phenomena 10.1016B978-0-12-511150-8.50008-3 19-44 1978.
Read More
Oct 01 1980 Ore Leaching by Bacteria Ore Leaching by Bacteria Lundgren D G Silver M 1980-10-01 000000 The elements iron and sulfur circulate in the biosphere through specific paths from environment to organisms and back to the environment. Certain paths only involve microorganisms and it is here that biological reactions of relevance in leaching of metals from mineral ores occur 28.
Read More
Jan 02 2019 These metabolites dissolve metals either by metal ion displacement from the ore via hydrogen ion or by chelates creation and solubilize metals. Leaching with fungus is rather slower compared to bacteria however despite this fungal leaching is best if minerals hold enough quantity of organic material such as black shale 8 9 .
Read More
Biomining is an increasingly applied biotechnological procedure for processing of ores in the mining industry biohydrometallurgy. Nowadays the production of copper from low-grade ores is the most important industrial application and a significant part of world copper production already originates from heap or dumpstockpile bioleaching.
Read More
Feb 01 1999 Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite FeS2 when they were grown in pure cultures and in mixed cultures with sulfur-oxidizingThiobacillus spp. Only one of the isolates strain T-24 oxidized pyrite when it was grown in pyrite-basal salts medium. However when pyrite-containing .
Read More
Jan 02 2019 These metabolites dissolve metals either by metal ion displacement from the ore via hydrogen ion or by chelates creation and solubilize metals. Leaching with fungus is rather slower compared to bacteria however despite this fungal leaching is best if minerals hold enough quantity of organic material such as black shale 8 9 .
Read More