Review of gold extraction from ores

Brooy, S.R. La; Linge, H.G.; Walker, Graham

doi:10.1016/0892-6875(94)90114-7

Cited by 294 publications

(138 citation statements)

References 10 publications

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“…1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.…”

Section: Introductionmentioning

confidence: 99%

Pretreatment Process on Refractory Gold Ores with As

2014

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The problem of the refractory nature of gold bearing arsenide ores is described. 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 pretreating refractory ores are considered. These options include: roasting oxidation; wet chemical treatment; bacterial peroxidation; and other pretreatments such as: eliminating arsenic in vacuum, volatile smelting, segregation of roasting, electrochemical oxidation. Its development tendency in the future is also looked ahead.KEY WORDS: arsenic-bearing gold ore; pretreatment process; refractory gold ore.

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Section: Introductionmentioning

confidence: 99%

Pretreatment Process on Refractory Gold Ores with As

2014

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“…This chemistry was applied to industrial processes as early as the 19th century to dissolve gold from gold-bearing ores [2][3][4], and although chlorination was quickly replaced by cyanidation in the gold mining industry, research into the use of halogens, in particular chlorine, bromine and iodine, has made a resurgence in recent decades due to environmental concerns associated with cyanide use [5,6]. A number of the industrial procedures for ore extraction use chlorine gas injected into the reaction chamber or alternatively water that contains dissolved chlorine gas [7], while other methods employ the reaction between sodium hypochlorite, hydrochloric acid and sodium chloride (Equation (2)) to generate chlorine gas in situ [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Straightforward Route to Tetrachloroauric Acid from Gold Metal and Molecular Chlorine for Nanoparticle Synthesis

King

Massicot

McDonagh

2015

Metals

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Aqueous solutions of tetrachloroauric acid of high purity and stability were synthesised using the known reaction of gold metal with chlorine gas. The straightforward procedure developed here allows the resulting solution to be used directly for gold nanoparticle synthesis. The procedure involves bubbling chlorine gas through pure water containing a pellet of gold. The reaction is quantitative and progressed at a satisfactory rate at 50 °C. The gold(III) chloride solutions produced by this method show no evidence of returning to metallic gold over at least twelve months. This procedure also provides a straightforward method to determine the concentration of the resulting solution using the initial mass of gold and volume of water.

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“…Uma classificação feita por premissas quanto à resposta do minério aos processos de beneficiamento e extração hidrometalúrgica é apresentada na Figura 1 [6,7].…”

Section: Ourounclassified

“…B: Ouro potencialmente não extraído (1,2 e 3) entre grãos de arsenopirita (4), calcopirita (5) e pirita (6).…”

Section: Figura 11unclassified

Caracterização Das Formas De Ocorrência E Associações De Ouro Por Análise De Imagens Quantitativa

Costa¹,

Nery²,

Ulsen³

et al. 2017

Tecnol. Metal. Mater. Min.

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ResumoAs unidades de beneficiamento de minério de ouro buscam cada vez mais uma produção de baixo custo e maximização dos ganhos financeiros. A caracterização tecnológica está inserida em uma abordagem multidisciplinar que permite agregar conhecimento, alternativas de otimização e redução nos custos de operação. Inserida como uma ferramenta na caracterização tecnológica, a análise de imagens automatizada tem relevante papel na mineração devido a agilidade, robustez estatística e confiabilidade nas análises. A técnica pode ser realizada por meio de imagens adquiridas em microscópio eletrônico de varredura, associada a microanálises químicas podendo ser utilizadas em diversas etapas em um empreendimento mineiro. Este estudo tem como objetivo a caraterização tecnológica de minério de ouro utilizando a técnica de análise de imagens automatizada por Mineral Liberation Analyser (MLA). A ferramenta da análise de imagens automatizada mostrou-se bastante eficiente definindo características particulares tais como a identificação das associações minerais, composição mineralógica, partição dos elementos e grau de acessibilidade dos grãos de ouro, o que fornece de forma objetiva subsídios para os trabalhos de planejamento de mina e processamento mineral. Palavras-chave: Caracterização tecnológica; Análise de imagens; Minério aurífero. QUANTITATIVE IMAGE ANALYSIS FOR CHARACTERIZATION OF GOLD OCCURENCE AND ASSOCIATION AbstractEvolution in gold ore processing units are increasingly focused towards efficiency seeking routines, leading to a low-cost and maximal financial gain. The mineral characterization, inserted into a multidisciplinary approach enables a knowledge adding dynamics that results in optimization alternatives and operating cost reduction. Being one of commonly used tools in mineral characterization, automated image analysis plays an important role in the mining sector mainly due to its rapid analysis, statistical robustness and reliability of the results. The technique can be performed using images acquired in a scanning electron microscope, usually associated with chemical microanalysis having applications in different stages of a mining venture. The following study aims to produce a mineral characterization using an automated image analysis technique by MLA. The automated image analysis tool proved to be very efficient defining particular features such as gold association, mineralogical composition, partition of the elements and accessibility of gold grains, which provides an objective subsidy for mine planning work and mineral processing.

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Review of gold extraction from ores

Cited by 294 publications

References 10 publications

Pretreatment Process on Refractory Gold Ores with As

Pretreatment Process on Refractory Gold Ores with As

A Straightforward Route to Tetrachloroauric Acid from Gold Metal and Molecular Chlorine for Nanoparticle Synthesis

Caracterização Das Formas De Ocorrência E Associações De Ouro Por Análise De Imagens Quantitativa

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