Bioleaching of gold ore

Pulps were monitored during bioleaching for solution pH and dissolved iron.

Bioleaching of gold ppt

JOM For larger scale, Fernbach flasks containing 1. He is currently president of Lyntek. The method is used for the treatment of coarser gold 30 microns in diameter or greater. This process is experimental and the keywords may be updated as the learning algorithm improves. Published on Nov 30, 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 chemical reaction. Samples were characterized by X-ray diffraction, X-ray fluorescence, geochemical analysis, fire assay, and other analytical tests. Download preview PDF. However, in most cases the bioleached residues are still active with respect to preg-robbing. Carbonaceous gold ores can also be effectively pre-treated by facultative thermophiles to yield enhanced gold recovery. Carbon-in-leach CIL tests were carried out by cyaniding either the native ore or the bioleached residue in the presence of varying amounts of Calgon GRC 6 x 16 mesh activated carbon.

Ferrous iron levels were analyzed by titration with cerric sulfate and ferroin indicator. Elmore Co.

bioleaching of uranium

Native ore and bioleached residues were evaluated for gold recovery by cyanidation under conditions specific for each test. Report prepared for Gold Capital Corporation Denver, Google Scholar Brierley, Corale L. Additional work is required to evaluate the relative merits of the different groups of leaching bacteria as applied to precious metal ores.

Biomining of gold

Ferrous iron levels were analyzed by titration with cerric sulfate and ferroin indicator. Personal correspondence. For larger scale, Fernbach flasks containing 1. Google Scholar Behre Dolbear and Company. Biox Amenability: Atlanta: Report No. The application of bioleaching to refractory precious metal ores is a relatively new concept in comparison to roasting and chemical oxidation, and is rapidly becoming established as a viable pretreatment alternative. The process is still used extensively by artesian mines in third world countries and at small mines, due to its simplicity Bioleach bacteria are characterised by their optimal operating temperatures. Additional work is required to evaluate the relative merits of the different groups of leaching bacteria as applied to precious metal ores. Pulps were monitored during bioleaching for solution pH and dissolved iron. Chapter 3. Comparative tests have demonstrated that bioleaching can be equal to or better than roasting or pressure oxidation in terms of product recovery and process economics. Total iron extractions were calculated from solubilized iron and precipitated iron analyses. Ashanti Goldfields Company Limited. Google Scholar Larson, E. Reactor operation is under alkaline or acidic conditions, depending upon the specific process.

Cyanided tails were washed and analyzed for gold content by fire assay. Gold extraction was calculated based on gold content in the native ore and the cyanided tails.

bioleaching of gold by microorganisms

The CSTRs consisted of baffled, water-jacketed glass reactors connected to circulating water baths for temperature control. The smallest of these consisted of ml Erlenmeyer flasks containing 0. He is currently president of Lyntek.

bioleaching of gold and silver
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Microbial oxidation of gold ores and gold bioleaching