Utilization of coal-oil agglomerates to recover gold particles

Marciano, A.; Costa, L.S.N.; Lins, Fernanda Freitas

doi:10.1016/0892-6875(94)90015-9

Cited by 13 publications

(3 citation statements)

References 7 publications

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“…For example, Marciano et al [70] used diesel oil, kerosene and vegetable oil as agglomerating liquids to process gold-containing materials, achieving 90% gold recovery. Calvez et al [66] performed tests using synthetic gold-bearing samples to evaluate the underlying principles by which gold is recovered by coaleoil agglomerates, including oilecoal ratios, agglomerateeore ratios, pH and coal particle size.…”

Section: Coaleoil Agglomerationmentioning

confidence: 98%

Alternatives to cyanide in the gold mining industry: what prospects for the future?

Hilson

Monhemius

2006

Journal of Cleaner Production

372

191

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This paper reviews a series of alternative lixiviant systems for the recovery of gold from ores and concentrates. For over 100 years, cyanide has been the leach reagent of choice in gold mining because of its high gold recoveries, robustness and relatively low costs. The environmental damages resulting from its mismanagement, however, have initiated widespread research aimed at identifying and developing less toxic leaching agents. The most widely-researched alternative lixiviants for gold ores are examined in this paper, but it is evident that none has yet made any significant inroad into the dominant position of cyanide as the reagent of choice at the vast majority of gold mines worldwide.

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Section: Coaleoil Agglomerationmentioning

confidence: 98%

Alternatives to cyanide in the gold mining industry: what prospects for the future?

Hilson

Monhemius

2006

Journal of Cleaner Production

372

191

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“…The CGA process was tested 26 years ago to replace amalgamation in Brazil by Marciano et al (1994) [106]. Using a synthetic ore with pure gold particles added and a concentrate from an artisanal mine, the authors tested different types of oil and types of coal.…”

Section: Coal-oil Agglomerationmentioning

confidence: 99%

Gravity Concentration in Artisanal Gold Mining

Veiga

Gunson

2020

Minerals

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Worldwide there are over 43 million artisanal miners in virtually all developing countries extracting at least 30 different minerals. Gold, due to its increasing value, is the main mineral extracted by at least half of these miners. The large majority use amalgamation either as the final process to extract gold from gravity concentrates or from the whole ore. This latter method has been causing large losses of mercury to the environment and the most relevant world’s mercury pollution. For years, international agencies and researchers have been promoting gravity concentration methods as a way to eventually avoid the use of mercury or to reduce the mass of material to be amalgamated. This article reviews typical gravity concentration methods used by artisanal miners in developing countries, based on numerous field trips of the authors to more than 35 countries where artisanal gold mining is common.

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“…The positive results from previous research works on coal-oil-gold agglomeration [4][5][6][7][8][9][10][11] and the promising environmental and technical viabilities of the process [12] have raised the need for adoption of this method in small scale mining in Tanzania where the hazardous use of mercury is still dominant [13], and was the motivation for doing this research.…”

Section: Introductionmentioning

confidence: 99%

Gold Recovery from Gold Bearing Materials Using Bio-Diesel, Vegetable Oils and Coal

Mlaki¹,

Katima²,

Kimweri³

2011

ENG

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The present work is focused on the performance of three types of coal-oil agglomerates on recovery of liberated gold from gold bearing materials. Pre-formed agglomerates developed using bio-diesel, castor oil and mineral diesel as liquid hydrophobic phases were used in the study. The influence of the type of liquid hydrophobic phase on the degree of gold recovery and the effect of factors such as gold particle concentration, viscosity, agglomerate size, agglomerate/ore ratios and particle penetration into agglomerates have been studied as a function of time. It is shown that gold recovery rate can be increased by an increase in agglomerate loading, surface area and the viscosity of the hydrophobic phase and high recoveries are attained up to 98.5%. Increase in concentration of gold particles per unit volume of slurry increased attachment rate but did not change the final recoveries attained. It is shown that gold particle penetration occurs mainly in the coarse agglomerates if contact is prolonged beyond 60 minutes. Examination of sections of gold-loaded agglomerates under reflected light microscope showed gold and some silicate particles penetrated in few cracked agglomerates and only gold particles were observed inside the uncracked agglomerates suggesting the possibility of gold selectivity during particles penetration. It was shown that the increase in gold recovery attained at prolonged contact time is due to both gold penetration and oleophilic attachment

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Utilization of coal-oil agglomerates to recover gold particles

Cited by 13 publications

References 7 publications

Alternatives to cyanide in the gold mining industry: what prospects for the future?

Alternatives to cyanide in the gold mining industry: what prospects for the future?

Gravity Concentration in Artisanal Gold Mining

Gold Recovery from Gold Bearing Materials Using Bio-Diesel, Vegetable Oils and Coal

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