Biooxidation of a Gold Bearing Arsenopyrite/pyrite Concentrate PDF Download
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Author: D. M. Miller
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 254
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Book Description
Author: D. M. Miller
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 254
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 127
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Book Description
Author: Douglas E. Rawlings
Publisher: Springer Science & Business Media
ISBN: 3662061112
Category : Science
Languages : en
Pages : 302
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Book Description
Biomining is the use of microorganisms in the recovery of metals from ores. During bioleaching, metals such as copper, nickel or zinc are oxidized through microbial action from the water-insoluble sulfide to the soluble sulfate forms. Although gold is inert to microbial action, microbes can also be used in gold recovery from certain types of ores because as they oxidize the ore, they open up its structure, thereby allowing a gold-solubilizing agent such as cyanide to penetrate the ore. The book describes several industrial bioleaching and biooxidation processes as well as the underlying theory and biology of the microbes involved.
Author: P. Bhakta
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 20
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Book Description
Author: Soumitro Nagpal
Publisher:
ISBN:
Category : Bacterial leaching
Languages : en
Pages : 264
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Book Description
Author: Katherine Malatt
Publisher:
ISBN:
Category :
Languages : en
Pages : 528
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Book Description
This study sought to determine the rates of ferric sulflate oxidation and bacterial oxidation of arsenopyrite. Ferric oxidation of arsenopyrite revealed unusual temperature related behaviour with the fastest leaching rate observed at 50οC above this the mineral surface became covered by a jarosite phase which hindered the reaction. Use of a flat disk of arsenopyrite allowed surface area based rates to be determined. These were similar to those for sized slurries under similar conditions. The rates of bacterial and ferric oxidation of arsenopyrite were also found to be comparable. This is further evidence for the "indirect" mechanism of bacterial leaching.
Author: Ashley Wayne Breed
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: John Marsden
Publisher: SME
ISBN: 9780873352406
Category : Science
Languages : en
Pages : 688
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Book Description
Extensively revised and updated, this edition provides the broad base of knowledge required by all working in the gold extraction and gold processing industries. It bridges the gap between research and industry by emphasizing practical applications of chemical principles and techniques.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The nature of the gold species present in the ore during the bio-oxidation process at Fairview Gold Mine, Barberton, South Africa, was studied quantitatively using 197Au Mossbauer spectroscopy. In the feed ore, about 50 per cent of the gold is in a chemically-bound form, presumably substituting into the arsenopyrite lattice. The remainder of the gold, a metallic gold-silver alloy, if liberated, is leached by cyanidation. The chemically-bound gold is not leached. Significantly, the gold was found to become reduced to the metallic state during the bio-oxidation process, with most of the reduction occurring during the first stage of bio-oxidation. The degree of reduction impacted on the subsequent recovery of the gold by cyanidation. Only about 6 per cent of the gold remained in the chemically-bound form in the residue that reported to the carbon-in-pulp circuit for gold recovery. The iron compounds and minerals throughout the process were studied by 57Fe Mossbauer spectroscopy. The iron-containing sulphides in the feed ore were found to consist mainly of pyrite, with some arsenopyrite. Most of the arsenopyrite dissolved during the first stage of bio-oxidation, along with some of the pyrite. The bio-oxidation process produced jarosites and various hydrated iron oxides.
Author: Mike D. Adams
Publisher: Elsevier
ISBN: 0080459080
Category : Technology & Engineering
Languages : en
Pages : 1077
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Book Description
The gold processing industry is experiencing change. As free-milling and oxide ores become depleted, more complex polymetallic and refractory ores are being processed, coupled with increasing pressure for stricter environmental compliance. Recent years have also seen a steady reduction in mineral processing and metallurgy graduates and a gradual loss of older operating experience. A contribution to documenting current and future best practice in gold ore processing seems timely.The focus of this volume is on advances in current gold plant operation, from conception to closure; chapters also cover innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage. Sufficient coverage is also given to the chemistry and engineering aspects. The general principle behind the structure of the volume is that of flowsheeting based on unit operations and applied to a mineralogical classification of gold ore types. From concept to closure, this book covers all unit operations, mineralogies and processes that are relevant to dealing with today's complex orebodies.Practical experience is vital to the successful development, operation and closure of any operation. The 42 chapters have been contributed by a total of 66 authors and co-authors who are experts from countries spanning the globe, and representing exhaustive practical knowledge covering many disciplines relevant to gold processing.* Current best practice as elucidated by a select panel of experts in the field* Innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage* Mineralogical-based approach to flowsheeting
