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Saturday, April 25, 2020 | History

2 edition of Alkaline oxidative leaching of gold-bearing arsenopyrite ores found in the catalog.

Alkaline oxidative leaching of gold-bearing arsenopyrite ores

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  • 37 Currently reading

Published by Dept. of the Interior in Washington, DC .
Written in English

    Subjects:
  • Gold -- Metallurgy.,
  • Sodium hydroxide.,
  • Leaching.,
  • Oxidation.

  • Edition Notes

    Statementby P. Bhakta, J.W. Langhans, Jr., and K.P.V. Lei.
    SeriesReport of investigations (United States. Bureau of Mines) -- 9258.
    ContributionsLanghans, J. W., Lei, K. P. V.
    Classifications
    LC ClassificationsUSBM
    The Physical Object
    Pagination12 p
    Number of Pages12
    ID Numbers
    Open LibraryOL22072288M
    LC Control Number89-600042


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Alkaline oxidative leaching of gold-bearing arsenopyrite ores by P. Bhakta Download PDF EPUB FB2

The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores. The best solution compositions for arsenopyrite dissolution were determined using cyclic voltammetry and by: 9.

Additional Physical Format: Online version: Bhakta, P. Alkaline oxidative leaching of gold-bearing arsenopyrite ores. Washington, D.C.: Bureau of Mines, U.S. Dept. Alkaline pressure oxidation at °C, kPa O2, and 2 M NaOH resulted in about 98% sulfur oxidation and 86% arsenic dissolution.

oxidative leaching of gold-bearing arsenopyrite ores. The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution Alkaline oxidative leaching of gold-bearing arsenopyrite ores book investigated as a function of O2, pressure and NaOH concentration.

Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation. Alkaline pressure oxidation Cited by: 5. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) http.

oxidative leaching of gold-bearing arsenopyrite ores. Arsenic extraction was demonstrated to depend on the concentration of NaOH for a FeAsS ore containing %.

A fundamental study of the alkaline sulfide leaching of gold M.I. Jeffrey1* and C.G Anderson2 been an increased interest in pressure oxidation as a means of treating gold bearing ores and concentrates.

Although there has been little fundamental research into gold leaching in the alkaline sulfide system,Cited by: Gold is mainly extracted from its ores or concentrates by leaching with oxygenated cyanide solutions [1,2].

Cyanide consumption during leaching, and Author: Corby Anderson. These results indicate that alkaline leaching could be a viable method for the processing of these long overlooked ores provided that the uranium is sufficiently liberated.

View Show abstract. As case study for the processing of an ore with a refractory component of visible and invisible Gold associated in and with Arsenopyrite had a gold content in the feed ranged from about g/tonne to about g/tonne depending on lithology.

There was some difficulty in measuring the feed gold content due to the presence of coarse gold in the composites. The silver content. The present study investigates the effect of atmospheric NaOH alkaline pretreatment on the cyanidation gold recovery of the arsenical Carlin-type gold ore from the Zarshuran deposit, Iran ( g t −1 Au feed grade).

The results are explained based on the mineralogical considerations and with the aid of thermodynamic and kinetic investigations Cited by: 3. T1 - Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite Concentrate.

AU - Hiskey, J. PY - /12/1. Y1 - /12/1. N2 - The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2 pressure and NaOH by: 5.

The alkaline oxidative leach pretreatment for gold-bearing arsenopyrite ores uses mild conditions, and the leach residue requires no washing or pH adjustment before cyanidation. By using 2M NaOH, ° C, 40 psig O2, 10 pct solids, and 4 h, more than 90 pct of the arsenic was extracted from the high-grade ore.

Gold bearing ore samples were taken from Gümüşhane Region, northern east part of Turkey. investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and g/t Ag and.

The oxidation of arsenopyrite [FeAsS] releases both sulfur and arsenic. Buckley and Walker () studied the oxidation of arsenopyrite in alkaline and in acidic aqueous solutions.

In air, the mineral reacted rapidly, and the oxidation of arsenic to As(III) was more rapid than Alkaline oxidative leaching of gold-bearing arsenopyrite ores book oxidation of iron on the same surface. The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (feass) ores.

The best solution compositions for arsenopyrite dissolution were determined using cyclic voltammetry and chronocoulometry. Pre-oxidation with H 2 O 2 prior to cyanidation increased DO from 1 up to ppm.

H 2 O 2 was injected at a rate of kg % H 2 O 2 /t of dry ore prior to cyanidation. NaCN consumption was reduced from to kg/t. • Au recovery was increased from average to %.Cited by: Treatment of Au-bearing arsenopyrite ores prior to leaching is essential to aid the removal of Au, and electro-oxidation is an effective treatment method.

Thus, numerous studies using cyclic voltammetry with arsenopyrite as the working electrode and various media as the electrolyte have been carried out to investigate the effect of electro Cited by: One of the more common classes of ores containing gold is when gold is associated with pyrite, pyrrhotite, and arsenopyrite.

This is the area of gold recovery that has probably received the most research and plant optimization support especially in light of the long history of South African industrial practice. From a reagent viewpoint, charged water soluble collectors such as.

A sodium hydroxide pretreatment at ambient temperature was evaluated to increase gold extraction from a high-grade arsenopyrite mineral. A 2 k factorial experimental design was established, with the following variables: NaOH concentration (–3 M), solid concentration (40– g/L) and treatment time (6–48 h).

After applying the pretreatment, standard leaching Cited by: The alkaline sulfide leaching rate of gold was found to be largely temperature dependent, with greater leach rates occurring at higher temperatures. The activation energy of the 50 g L −1 sulfide and 25 g L −1 polysulfide system was kJ mol −1, indicating that the dissolution of gold in this polysulfide/sulfide system is chemically Cited by: LEACHING OF THE ARSENOPYRITE/PYRITE FLOTATION CONCENTRATES 1 MAHLANGU, T., GUDYANGA, F.P., and SIMBI, D.J.

Leaching of the arsenopyrite/pyrite flotation concentrates using metallic iron in a hydrochloric acid medium. Hydrometallurgy Conference ,The Southern African Institute of Mining and Metallurgy, Author: T. Mahlangu.

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores. ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta,1 J. Langhans, Jr.,1 and K. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores.

The nature and proportions of the products of the oxidation of arsenopyrite in aerated alkaline solutions have been studied using high pressure ion chromatography techniques that have shown that thiosulfate and a new species, monothioarsenate, are the main oxidation products of arsenopyrite apart from arsenate and : Suchun Zhang.

Bhakta has written: 'Alkaline oxidative leaching of gold-bearing arsenopyrite ores' -- subject(s): Gold, Leaching, Metallurgy, Oxidation, Sodium hydroxide Asked in Earthquakes, Avalanches What.

Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold.

This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 Author: Alan Joseph Rego.

Flotation of gold and gold-bearing ores Flotation reagents at the Stawell Gold Mine in Victoria, Australia, where carbonaceous pyrite–pyrrhotite gold ores with minor quantities of arsenopyrite are floated at a slightly elevated pH value, include copper sulfate, PAX. Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing completely updated edition features coverage of established, newly.

A fundamental study of the alkaline sulfide leaching of gold M.I. Jeffrey1* and C.G Anderson2 1 Department of Chemical Engineering, Monash University, Vic.,Australia 2 The Center for Advanced Mineral and Metallurgical Processing, Montana Tech of the University of Montana, Butte, Montana,USA Received 19 September ; accepted ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P Bhakta,1 J W Langhans, Jr,1 and K P V Lei2 ABS"rRACT The US Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) or The best solution compositions for.

However, it was significant that the biooxidation of arsenopyrite in the mixed mineral preceded that of pyrite, suggesting a sequential mechanism. Gold liberation was found to be linearly related to arsenopyrite biooxidation but oxidation of pyrite appears to be preferential in the gold-rich by: Alkaline Leaching Pretreatment.

Alkaline leaching pretreatment is a chemical pretreatment process which can oxidize and dispose of components of the ore through adding chemical reagents. Meng Yuqun, Wu Minjie, etc.

have researched to strengthen the alkaline leaching pretreatment on a gold concentrate with As at normal temperature and Cited by: 5. With 46% arsenic content, arsenopyrite, along with orpiment, is a principal ore of arsenic.

When deposits of arsenopyrite become exposed to the atmosphere, usually due to mining, the mineral will slowly oxidize, converting the arsenic into oxides that are more soluble in water, leading to acid mine drainage.".

Alkaline Oxidation. Arsenopyrite has an economic importance, when there is more of it than gold in the ore. Oxidation of arsenopyrite is of practical and theoretical importance in processing gold ores and by: 3. "The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (feass) ores.

The best solution compositions for arsenopyrite dissolution were determined using cyclic voltam Cited by: 2. Biooxidation of refractory gold-bearing pyrite-arsenopyrite flotation concentrate was optimized and the abundance of predominant groups in the community of thermophilic acidophilic chemolithotrophic microorganisms at various stages of bioleaching was determined.

The optimal parameters for growth and leaching/oxidation of the mineral components of the Cited by: 4. Ammonia and sodium chloride were used for alkaline oxidation pretreatment of refractory gold ore before cyanide leaching.

Ca(OH) 2 was used as a pH modifier to maintain the pH at the targeted value during oxidation and leaching. Sodium cyanide was also applied as a leaching by: 2. Processing Gold Ores Using Heap Leach, with iron oxide and, heap leach silver, leaching of gold-bearing arsenopyrite ores.

Gold & Silver 7 Gold & Silver Gold has played a, the sulfur-bearing minerals Roasting of sulfide ores involves heating, ore slurry in tanks Heap leaching. Initial arsenopyrite dissolution occurred at - V versus standard hydrogen electrode (she) in a sodium hydroxide (naoh) solution.

Leaching of a high-grade arsenopyritic ore containing, in percent, As, Fe, Total s, and Sb and, in troy ounces per short ton, Au and Ag resulted in > 90 pct as extraction at deg c Cited by: 9. Arsenic Pyrite Gold Extraction by Alkaline Leaching Oxidation.

Increasing the leaching time generally resulted in higher arsenic extractions, as indicated by comparing the results from tests 3 and 6, and 5 and ideal leaching time was defined as that needed to extract enough arsenic such that a high extraction of gold.

Which is the soil formed by leaching and oxidation? Wiki User laterite soil. Related Questions. Asked in Agriculture, Gardening, Soil.ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P.

Bhakta 1 J. W. Langhans Jr. 1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta 1 J. W. Langhans Jr. 1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline .A Method for Leaching or Dissolving Gold from Ores or.

lurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal.