Leaching of a Nigerian Refractory Gold Ore Using Aqua Regia

Teniola, Oluwasanmi Samuel; Adeleke, A. A.; Ibitoye, S. A.; Shitu, Moshood Deinde

doi:10.3844/ajeassp.2022.118.125

Cited by 3 publications

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“…Gold is a precious metal barely constituting about 0.005 parts per million (ppm) in the earth's crust and must be upgraded by a value of about 3500 to obtain commercial concentrates [1]. Gold ore deposits that are refractory contain pyrrhotite and pyrite, impeding their cyanidation treatment if a roasting pretreatment is not carried out beforehand [2]. Cyanidation presents two challenges related to toxicity and its ability to dissolve gold occluded in carbonaceous materials is limited [3].…”

Section: Introductionmentioning

confidence: 99%

Production of a Highly Concentrated Gold Solution from Aqua Regia Gold Leachate Using Sugarcane Bagasse Nanoparticles

Teniola,

Adeleke,

Ibitoye

et al. 2023

Hung. J. Ind. Chem.

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This study produced a highly concentrated gold solution using nanoparticles (NPs) synthesized from sugarcane bagasse as an adsorbent for gold(III) recovery from an aqua regia gold leached lean solution. A 100 kg sample of gold ore collected from a mining site in Iperindo was concentrated. Mineralogical characterization and a fire assay test of the ore were carried out. Atmospheric and agitation leaching were conducted using aqua regia. Sugarcane bagasse NPs were prepared and used to study the gold(III) adsorption kinetics. Gold-loaded sugarcane bagasse NPs were desorbed in a 4 M aqua regia solution. The results revealed that the ore has a low water retention capacity which renders it friable. A microscopic examination established the presence of gold particles and pyrite in the ore. Ore leaching was eminently favoured by agitation yielding a weight loss of 6.3 % when an acid concentration of 4 M was used, the temperature was 90 ºC and the leaching time was 30 minutes. Synthesized nanocellulose was able to adsorb gold(III) from the leachate optimally with the following process parameters: 14 mL/g of adsorbent, 106.2 minute-long contact time, a temperature of 56 ºC and an agitation rate of 45 rpm when the concentration of leachate was 84 mg/L. The adsorption efficiency of the sugarcane bagasse NPs is comparable with that of commercial activated carbon, namely 92 and 95 %, respectively. The study concluded that NPs synthesized from sugarcane bagasse could be effectively used when upgrading gold and in purification processes.

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Section: Introductionmentioning

confidence: 99%

Production of a Highly Concentrated Gold Solution from Aqua Regia Gold Leachate Using Sugarcane Bagasse Nanoparticles

Teniola,

Adeleke,

Ibitoye

et al. 2023

Hung. J. Ind. Chem.

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The comparison of gold extraction methods from the rock using thiourea and thiosulfate

Yanti,

Marliana,

Anugrahwati

et al. 2023

Open Chemistry

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Gold extraction from the rock is generally carried out using mercury. However, the high toxicity of mercury has a very dangerous impact on the environment and health. Various efforts have been made to reduce the use of mercury in gold extraction, one of which is the leaching method using thiosulphate and thiourea solution because they have low toxicity and are environmentally friendly. This study aimed to determine the results of gold extraction with thiosulphate and thiourea solution and determined the optimum concentration and time of extraction. The yield of the gold extract with thiosulphate solution was greater than that of thiourea solution. The thiosulphate solution had an optimum concentration of 0.3 M and an optimum time of 2 h. While the thiourea solution had an optimum concentration of 0.2 M and an optimum time of 3 h. The results of the Friedman test on the leaching time and concentration parameters show that leaching time has a significant effect on the Au leaching process, and the concentration parameter does not affect the Au leaching process from solid samples.

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Comparative Study: Biodegradable Chelating Agents vs. Aqua Regia for Extraction of Indispensable Elements from Pyrite Ore of Bagrot, Gilgit Baltistan

Sharif,

Raza,

Raza

et al. 2024

Green Chemical Technology

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Leaching of a Nigerian Refractory Gold Ore Using Aqua Regia

Cited by 3 publications

References 0 publications

Production of a Highly Concentrated Gold Solution from Aqua Regia Gold Leachate Using Sugarcane Bagasse Nanoparticles

Production of a Highly Concentrated Gold Solution from Aqua Regia Gold Leachate Using Sugarcane Bagasse Nanoparticles

The comparison of gold extraction methods from the rock using thiourea and thiosulfate

Comparative Study: Biodegradable Chelating Agents vs. Aqua Regia for Extraction of Indispensable Elements from Pyrite Ore of Bagrot, Gilgit Baltistan

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