An Investigation Into the Bacterial Leaching of a Gold-bearing Pyrite/arsenopyrite Ore PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download An Investigation Into the Bacterial Leaching of a Gold-bearing Pyrite/arsenopyrite Ore PDF full book. Access full book title An Investigation Into the Bacterial Leaching of a Gold-bearing Pyrite/arsenopyrite Ore by Philippa Fernandes Norman. Download full books in PDF and EPUB format.
Author: Philippa Fernandes Norman
Publisher:
ISBN:
Category :
Languages : en
Pages : 346
Get Book Here
Book Description
Author: Philippa Fernandes Norman
Publisher:
ISBN:
Category :
Languages : en
Pages : 346
Get Book Here
Book Description
Author: Katherine Malatt
Publisher:
ISBN:
Category :
Languages : en
Pages : 528
Get Book Here
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: P. Bhakta
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 20
Get Book Here
Book Description
Author: Douglas E. Rawlings
Publisher: Springer Science & Business Media
ISBN: 3662061112
Category : Science
Languages : en
Pages : 302
Get Book Here
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:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The liberation of refractory gold from sulphides during bacterial oxidation was investigated using arsenopyrite and pyrite crystals isolated from a refractory Barberton gold ore. Polished sections of the crystals were prepared and the mode of occurrence of gold within these sulphides was determined, using a scanning electron microscope (SEM) and an electron microprobe. It was found that the arsenopyrites and pyrites are chemically zoned, due to alternating enrichment and depletion in the As-content. The submicroscopic gold is heterogeneously distributed in the arsenopyrite and is specifically enriched in zones with a relatively moderate Fe-content, a high As-content and a low S-content. The As-rich zones in the pyrite are also enriched in submicroscopic gold. Particulate gold occurs as inclusions within arsenopyrite and pyrite mainly at the contacts between different zones. Polished sections were suspended in the bacterial leach pulp in an air-stirred vessel for various periods of time. The effects of the sulphide oxidation were monitored by observations of the leached sections under both an optical microscope and a SEM. The As-rich zones in both arsenopyrite and pyrite crystals were preferentially and rapidly oxidized. Structural deviations in the sulphide lattices, such as zone contact, cracks, dislocation and contacts between different sulphide generations, were also sites of initial bacterial attack. These results show that the composition of the sulphides plays a fundamental role in determining the sites and rates of bacterial oxidation. Due to this preferential oxidation of high gold-bearing areas in the sulphides, large amounts of particulate and submicroscopic gold will be liberated during the very early stages of sulphide oxidation. The As-poor zones in both the arsenopyrite and pyrite crystals were oxidized during the later stages of bacterial oxidation, which will result in the slower liberation of the remaining gold.
Author:
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 360
Get Book Here
Book Description
Author: Jon I. Voltz
Publisher:
ISBN:
Category : Blast effect
Languages : en
Pages : 16
Get Book Here
Book Description
Author: Soumitro Nagpal
Publisher:
ISBN:
Category : Bacterial leaching
Languages : en
Pages : 264
Get Book Here
Book Description
Author: John Thompson Chapman
Publisher:
ISBN:
Category : Leaching
Languages : en
Pages :
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Get Book Here
Book Description
