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pretrement process of the determination of encapsulated gold ores by aas

Analytical Methods for Atomic Absorption Spectroscopy

Analytical Methods for Atomic Absorption Spectroscopy

PL-6 - Analysis of Synthetic Fibers: Determination of Gold.....294 GN-1 - General Procedure for the Indirect Determination of Sulfate .....296 GN-2 - General Procedure for the Indirect Determination of

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US5536297A Gold recovery from refractory carbonaceous

US5536297A Gold recovery from refractory carbonaceous

A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a ...

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Minerals Free Full Text CIL Gold Loss Characterization

Minerals Free Full Text CIL Gold Loss Characterization

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.

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Study on Pre oxidation of a High Arsenic and High Sulfur

Study on Pre oxidation of a High Arsenic and High Sulfur

Feb 03, 2020 For arsenic-containing refractory gold concentrate, gold recovery by leaching is extremely difficult due to the encapsulation of gold in arsenopyrite and pyrite. In this work, the pre-oxidation of a high-arsenic and high-sulfur refractory gold concentrate in the acidic potassium permanganate or hydrogen peroxide solutions has been investigated.

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Characterisation of Biooxidation Feed and Products for

Characterisation of Biooxidation Feed and Products for

establish the gold deportment in the samples. This process, having several versions for process plant design and troubleshooting, allows the gold associated with different groups of mineral phases such as oxides, carbonates, sulphides, and carbonaceous matter to be determined [19-20]. The procedure used in this study is detailed in Figure 1.

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Gold Extraction in Carbonaceous Ore using Thiosulfate

Gold Extraction in Carbonaceous Ore using Thiosulfate

Dec 06, 2017 Gold extractions in the column tests ranged from 69 to 78 pct with thiosulfate consumption ranging from 0.4 to 5.4 kg/mt ore. These results compare to 5 pct gold extraction using standard cyanide leaching conditions. Gold ores can be predominantly classified into two general categories based on the host material: refractory and non-refractory.

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metals metals Article Effective Gold Recovery from Near

metals metals Article Effective Gold Recovery from Near

View metals from FISICA QUI 3009 at University of Puerto Rico, Arecibo. metals Article Effective Gold Recovery from Near-Surface Oxide Zone Using Reductive Microwave Roasting and Magnetic

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Assaying Microscopy Mineralogy amp XRF XRD

Assaying Microscopy Mineralogy amp XRF XRD

To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN; Use Add New Topic to ask a New Question/Discussion about Assaying, Microscopy, Mineralogy & XRF/XRD.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.

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Minerals Free Full Text Consideration of Influential

Minerals Free Full Text Consideration of Influential

Iodide-oxidizing bacteria (IOB) oxidize iodide into iodine and triiodide which can be utilized for gold dissolution. IOB can be therefore useful for gold leaching. This study examined the impact of incubation conditions such as concentration of the nutrient and iodide, initial bacterial cell number, incubation temperature, and shaking condition on the performance of the gold dissolution ...

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A Review on Alternative Gold Recovery Re agents to Cyanide

A Review on Alternative Gold Recovery Re agents to Cyanide

Aug 18, 2016 The importance of gold recovery from low grade ores and flotation tailings is continuously increasing due to raising gold demand and thereby high gold prices. However, due to raising social awareness of the ecological impacts of cyanidic gold extraction and environ-mental specifications, the development and the implementation of alternative hydrometallurgical extraction processes have been …

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The effecT of Iron And o IdI Ing flu AddITIon on The fIre

The effecT of Iron And o IdI Ing flu AddITIon on The fIre

determination of ore content was performed by using an X-ray fluorescence analyzer (XRF, Thermo SCIENTIFIC, NITON XL3t). An atomic absorption spectrometer (AAS, Perkin Elmer Analyst 800) and an inductively coupled plasma spectrometer (ICP, JY 138 ULTRACE) were used to determine both gold-silver quantities of the raw ore, which were below the ...

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US4919715A Treating refractory gold ores via oxygen

US4919715A Treating refractory gold ores via oxygen

Gold-containing ores, having refractory sulfidic matter or a combination of refractory sulfidic matter and refractory carbonaceous matter, are processed to recover their gold values. The process uses an ore roasting procedure that utilizes a two-state, fluidized bed roaster. The process also employs a pure oxygen atmosphere during roasting.

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Arsenic removal strategy in the processing of an

Arsenic removal strategy in the processing of an

Alkaline pretreatment for refractory gold ore. The pretreatment conditions were 40 g/l of 3 M or 0.1 M NaOH solution with constant stirring for 48 h. Once the pretreatment was finalized, solution samples were taken to quantify the iron and arsenic released as a result of the alteration of the mineral matrix.

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Improving gold recovery from refractory gold ores through

Improving gold recovery from refractory gold ores through

Mar 01, 2017 Refractory gold concentrates used in the investigations were obtained by flotation of high-sulfidation and low sulfidation gold ores originally from Sumatra and Sulawesi Region, in Indonesia. The concentrate with high sulfur content (sample A) contained 20.55% of total sulfur, while low-sulfur concentrate (sample B) contained 5.05% of total sulfur.

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Comparative Study on Two Pretreatment Processes for

Comparative Study on Two Pretreatment Processes for

Jul 10, 2019 Sample pretreatment is important for chemical phase analysis of elements. In this study, the geological samples of the Laozuoshan gold mine are chosen to pretreat by ultrasonic centrifugation and cyclotron oscillation, and the content of gold in eight chemical phases (water-soluble, ion exchange and clay adsorption, organic matter bound, iron-manganese oxide bound, naked or seminaked ...

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The process mineralogy of gold The classification of ore

The process mineralogy of gold The classification of ore

To render refractory gold ores/concentrates amenable to cyanide leaching, the decomposition of sulphide minerals within a pre-treatment process to expose the encapsulated gold grains to …

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Understated Gold AAS assay Laboratory Testing amp General

Understated Gold AAS assay Laboratory Testing amp General

The prill can be treated in 2 ways. The prill is either digested in aqua regia and then the gold in solution is determined on AAS( mainly used in gold mining for ores .05 g/t the prill is digested to remove the silver and the gold remained is gravimetrically determined by weighing. The mass of …

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Determination of gold and silver in geological samples by

Determination of gold and silver in geological samples by

Feb 01, 2016 Focused infrared radiation-based digestions, for the determination of gold and silver, can be achieved in a timeframe as short as 10–15 min, making it an attractive candidate technology for the mining industry, where very large numbers of samples are analyzed on a daily basis.An investigation was carried out into gold and silver dissolution chemistry from geological samples using this novel ...

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Characterization of refractory behaviour of complex gold

Characterization of refractory behaviour of complex gold

refractory gold ore containing 5.9% pyrrhotite, 0.9% pyrite, 1.3% arsenopyrite and a bulk flotation concentrates. Based on the results of diagnostic leaching tests, CELEP et al[23] concluded that the refractoriness of a refractory gold ore was associated with the dissemination and encapsulation of the very fine gold

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Research on leaching of carbonaceous gold ore with copper

Research on leaching of carbonaceous gold ore with copper

Jun 15, 2019 The gold extraction increased to 90% after the ore was microwave roasted for 30 min at 500 C. The increase in gold extraction after microwave roasting pre-treatment was caused by the formation of surface cracks, which facilitated the transport of the thiosulfate lixiviant to otherwise encapsulated gold.

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Application of eMAX analysis of pressure oxidation of

Application of eMAX analysis of pressure oxidation of

Feb 01, 1994 The ore may contain fine gold encapsulated in host matter such as sulphide minerals. ... Roasting is the oldest pretreatment for refractory gold ores decomposing the sulphides and destroying the preg-robbing carbonaceous material [4]. It is the most widely used oxidative pretreatment process for refractory gold ores producing a porous hematite ...

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Improvements in gold ore cyanidation by pre oxidation with

Improvements in gold ore cyanidation by pre oxidation with

Treatment of gold-bearing ore with hydrogen peroxide during heap leaching of gold increases gold recovery by 1.2% and amounts to 55.89%, without treatment - 54.69%. This increases the …

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Pretreatment of a refractory arsenopyritic gold ore using

Pretreatment of a refractory arsenopyritic gold ore using

Mar 01, 2015 For gold encapsulated in arsenopyrite or pyrite, pretreatments are necessary in order to break or alter the matrix of the sulfide (Chryssoulis and McMullen, 2005, Climo et al., 2000, Hashemzadehfini et al., 2011). The most common techniques include pre-aeration, roasting, high pressure oxidation and biological oxidation.

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Pretreatment Process on Refractory Gold Ores with As

Pretreatment Process on Refractory Gold Ores with As

The basic principle, characteristics and application of pretreatment technique of arsenic-bearing gold ores are presented in this paper. Several different classes of process options for ...

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A new method for determination of preg robbing in gold ores

A new method for determination of preg robbing in gold ores

Determination of preg-robbing in gold ores of the northwest of the Province of San Juan, Argentina. The objective of this work was to determine the presence of preg-robbing in a blend of sulphide ...

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Rapid high performance sample digestion for ICP

Rapid high performance sample digestion for ICP

encapsulation and sulphide-rich gold ores limit the degree of gold leaching by various lixiviants even a er ne grinding.13 Recently, Leybourne and Rice presented a preliminary mathe-maticalcorrelation equation‡toillustrate thesystematic biasof gold values between FA …

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Gold Metallurgy amp Leaching in Cyanicides

Gold Metallurgy amp Leaching in Cyanicides

Jul 14, 2016 Optimize Gold Leaching & Recovery with Chromium Minerals. Lead Chromite (PbCrO4)5. Cyanidation as applied to ordinary gold and silver ores is a relatively simple process. When cyanicides {cyanide-consuming elements) are encountered in small amounts in the treatment of such ores, the various schemes already discussed, such as use of a lead salt ...

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Determination of Gold in Soils President's Message and

Determination of Gold in Soils President's Message and

Determination of Gold in Soils and Sediments by Fire Assay or Aqua Regia Digestion… continued from page 1 The March 2013 issue of EXPLORE features one technical article by Matt Leybourne and Sarah Rice of ALS Geochemistry that reviews the optimal methods for determining gold …

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JAAS pubs.rsc.org

JAAS pubs.rsc.org

encapsulation may be the main reason for low gold yields.12 Senanayake argued that silica encapsulation and sulphide-rich gold ores limit the degree of gold leaching by various lixiviants even after fine grinding. 13 Recently, Leybourne and Rice presented a preliminary mathematical

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Mine Site Laboratory Services Gold

Mine Site Laboratory Services Gold

determination of gold content in a sample is dependent on the nature of the sample matrix, the grain size and distribution of the gold and the end use of the assay data. The objective of assays and analysis routinely carried out on gold plants by mine site laboratories is to provide information to optimise the mining process: • Ore reserves;

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Gold Ore Assaying With Atomic Spectrometry

Gold Ore Assaying With Atomic Spectrometry

Determination Of Gold By Flame Atomic Absorption. Assaying of gold jewellery – Choice of technique Introduction associated with the analysis of ores and metals in the context of gold jewellery assaying means the determination of the gold content of Spectrometry (XRF) No – surface only Measures emitted X rays Atomic Absorption.A novel method to preconcentrate gold was developed employing a ...

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Colorimetric and visual determination of Au III ions

Colorimetric and visual determination of Au III ions

Jan 10, 2018 Gold has been applied in industry widely due to its good thermal conductivity [], electrical conductivity [] and malleability [].Gold is mostly extracted from the gold ores and recover of gold from waste electronic equipment has drawn increasing attention [4, 5].Thus, a rapid and selective method for determination of gold in gold ores and waste electronic equipment has been required.

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The Application of Flame Atomic Absorption Spectrometry

The Application of Flame Atomic Absorption Spectrometry

A developed method was designed for gold determination directly in organic medium in some sedimentary rocks (fine sandstone, carbonates), pyrite, serpentine and international standard gold sample (MA-1a) using flame atomic absorption spectroscopy (FAAS). Instrumental parameters; burner angle, fuel flow rate, band pass and burner height together with chemical parameters; different media ...

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Cold Vapor Determination of Mercury by AA

Cold Vapor Determination of Mercury by AA

Aug 27, 2017 The Bureau’s Albany Research Center has constructed an analytical system for the cold-vapor determination of mercury. The basic component is a modified Perkin-Elmer model 303 atomic absorption spectrophotometer. A special reduction cell and a combined vaporization chamber and optical cell have also been fabricated.

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v117n8a4 Evaluation of ozonation technology for gold

v117n8a4 Evaluation of ozonation technology for gold

of the gold ore. Pre-treatment was conducted at 30% solids. Operating parameters such as Eh and ozone concentration in the gas phase were monitored. The test pH was adjusted to the required value by the addition of sulphuric acid. Evaluation of ozonation technology for gold …

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169 University of Science and Technology Beijing and

169 University of Science and Technology Beijing and

sulfide lattice must be oxidized and decomposed. Pretreatment of refractory gold ores, such as roasting, chemical oxidation, pressure oxidation, ultrafine grinding, or biological oxidation can be used to expose the encapsulated gold and enable an increase in the gold recovery rate [11-15].

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