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1 edition of Extraction of silver from refractory ores. by B.J. Scheiner [and others]. found in the catalog.

Extraction of silver from refractory ores. by B.J. Scheiner [and others].

Extraction of silver from refractory ores. by B.J. Scheiner [and others].

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Published by U.S. Bureau of Mines in Washington .
Written in English


Edition Notes

11

The Physical Object
Pagination11 p.
Number of Pages11
ID Numbers
Open LibraryOL22016911M

An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Software. An illustration of two photographs. Images. An illustration of a heart shape Donate. An illustration of text ellipses.   Higher sulfide ores require much more chlorine gas. For very refractory ores the "Double Oxidation" process described in P. Afenya, Treatment of Carbonaceous Refractory Gold Ores, Minerals Engineering, Vol. 4, pp. , , hereby incorporated by reference, has been used. Environmental factors also play a large part in driving costs.

You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Bench and pilot scale testing has shown that biooxidation of a refractory arsenical sulphide concentrate enhanced gold and silver extraction by cyanidation. Direct cyanidation of Southern Tail bulk sulphide concentrate typically resulted in less than 10% gold and silver recovery. Biological pretreatment of the sulphide concentrate resulted in 70% gold extraction and at least 30% silver.

Significantly lower silver extraction than gold has been commonly observed in gold-silver cyanidation plants, especially in heap leaching operations. The different mineralogy of gold and silver in the ores is suspected to be the main reason, e.g., the occurrence of low solubility acanthite may result in low overall silver extraction. Leaching of silver sulfide with ferricyanide and its. An investigation has been conducted into the nature and rates of the physical, chemical, biological, and thermal processes involved in the heap biooxidation of pyrite from refractory gold ores. A heap-scale model of the ideal process was developed, aided by a systematic experimental approach, which accounts for the following phenomena. Grain-Scale Kinetics - The thermal and chemical.


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Extraction of silver from refractory ores. by B.J. Scheiner [and others] Download PDF EPUB FB2

Extraction of silver from refractory ores (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Bernard J Scheiner; United States. Bureau of Mines. Additional Physical Format: Print version: Extraction of silver from refractory ores.

[Washington, D.C.]: U.S. Dept. of Interior, Bureau of Mines, Rose and Newman’s very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its latest, fourth edition (). 1 Dorr and Bosqui’s Cyanidation and Concentration of Gold and Silver (2d edition, ) has a brief chapter (XIII) on “Cyanicides and Refractory Ores,” with only four pages devoted to Cited by: 9.

Minerals Engineering, Vol. 4, Nospp./91 $ + Printed in Great Britain Pergamon Press plc TREATMENT OF CARBONACEOUS REFRACTORY GOLD ORES P.M. AFENYA Dept. of Mining Engineering, UniversityofTechnology, Lae, Papua New Guinea ABSTRACT Gold ores can be categorized into two types - free milling and by: The extraction of gold from refractory ores containing activated carbon and various types of carbon compounds is being done commercially for the first time at Carlin, Nev., by Carlin Gold Mining.

The characteristics of gold ores change with time during exploitation from free-milling to refractory and double refractory gold ores.

This prevents extraction of the minerals of interest in. Hydrometallurgy, 34 () Elsevier Science B.V., Amsterdam Refractory gold-bearing ores: a review of treatment methods and recent advances in biotechnological techniques Nieves Iglesias and Francisco Carranza Chemical Engineering Department, University of Sevilla, Sevilla, Spain (Received Janu ; revised version accepted Ma ) ABSTRACT.

1. Introduction. Refractoriness in gold ores may be caused by several factors including the presence of sulfides, tellurides, cyanicides and carbonaceous matter (Boyle, ; Guay, ).When it is due to the presence of both sulfides and carbonaceous matter (CM), the ore is said to be double refractory (Nyavor and Egiebor, ).In such ores, gold particles may sometimes be.

Thiosulfate consumption was generally ∼3–5 kg/t ore. Similar reagent concentrations were used by Lakefield Research at 40–60 °C and pH to leach Barrick Gold carbonaceous refractory ores after pressure-oxidation pretreatment (Fleming et al., ).

Up to 95% of the gold was extracted from the finely divided gold left in the oxidized. Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter.

In case of certain ores, gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are taken to prevent this adsorption reaction from occurring.

A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous component of the ore for subsequent recovery.

The preg-robbing capacity of the native carbonaceous component of the ore can be augmented by adding recycled. In book: Noble Metals. Lindstrom R.E. and Scheiner B.J., “Extraction of molybdenum and rhenium from. The effect of protective alkali on the extraction of silver from refractory ores.

A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold.

DLT serves to qualitatively evaluate the gold occurrences within the ore. Radke and Scheiner (), apart from carbonates, separated the carbonaceous material in refractory gold-bearing ores into three components (Sibrell et al., ; Pyke et al., ): l l.

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The application of ammonium thiosulfate for the treatment of copper–gold ores has been investigated. Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution.

The leaching results of different types of gold ores including oxide, sulfide, carbonaceous and refractory ores/concentrates and the fundamentals relevant to the oxidation of pure gold are summarised. This review has as its underlying premise the need to become proficient in delivering a suite of element or metal products from polymetallic ores to avoid the predicted exhaustion of key metals in demand in technological societies.

Many technologies, proven or still to be developed, will assist in meeting the demands of the next generation for trace and rare metals, potentially including the.

Lindstrom, R.E. and Scheiner, B.J. (): Extraction of molybdenum and rhenium from concentrates by elelctro-oxidation. (): Processing refractory carbonaceous ores for gold recovery. Refractory Ore Head Analysis Sample Carbonate Organic s2- S 0 4 S total C N CIL Carbon Carbon Extract Extract % % % % % % % SP - SP - Pinson -The cyanidation results (CN Extract) and.

An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Software. An illustration of two photographs.

Full text of "Gold and silver leaching practices in the United States".Full text of "Precious metals recovery from low-grade resources: proceedings, Bureau of Mines open industry briefing session at the National Western Mining Conference, Denver, CO, Febru " See other formats.3.

Pressure Oxidation of Complex Copper Ores and Concentrates • 4. Electrolytic Copper Electrowinning and Solvent Extraction - World Operating Data • 5. Economic Considerations for SX/EW Operations 6. Checklist for Environmental Compliance 7.

Managing Zaldivar - Placer Dome's Approach to Project Management •Section 2.