Gold extraction by chlorination using a pyrometallurgical process

Ojeda, M.W.; Perino, Ernesto; Ruiz, Manuel

doi:10.1016/j.mineng.2008.09.002

Cited by 49 publications

(17 citation statements)

References 4 publications

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“…This process is fast because the physical form of the scrap is not as important as that required in chemical treatments. However, pyrometallurgical processes require a high amount of energy and cause emission of SO 2 gas which is a severe environmental pollutant (Ojeda et al, 2009;Havlik et al, 2010). When using pyrometallurgical and hydrometallurgical methods together, spent catalysts are roasted before chemical leaching (Lee et al, 1992;Park et al, 2007).…”

Section: Pyrometallurgical Methodsmentioning

confidence: 99%

A review of metal recovery from spent petroleum catalysts and ash

et al. 2015

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Section: Pyrometallurgical Methodsmentioning

confidence: 99%

A review of metal recovery from spent petroleum catalysts and ash

et al. 2015

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“…[5][6] A study of gold recovery by pyrometallurgical process by using calcium chloride salts was proven to have a high recovery. 7 However, this method consumes excessive energy, it is time consuming, and it could not recover low concentrations of gold.…”

Section: Introductionmentioning

confidence: 99%

An innovative use of electrochemically modified three‐dimensional carbon felt for a rapid recovery of gold from diluted chloride solution

Kanagaratnam

Suah

2021

J of Chemical Tech & Biotech

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BACKGROUND: This study presents the novel use of modified Shipley-activated carbon felt in an electrogenerative process via flow-through batch recycle cell to recover gold, Au(III), from chloride solutions. RESULTS:The recovery of Au(III) was conducted in a batch recycle cell equipped with three-dimensional activated carbon felt as a cathode and zinc as an anode. Several initial Au(III) concentrations (50, 100, 250, and 500 mg L −1 ) and different types of cathode materials (carbon felt and reticulated vitreous carbon) were used to evaluate the cell performance. Both the electrodes were at the same size (2.0 cm × 5.3 cm × 0.3 cm) and volume (3.18cm 3 ). At optimum conditions, total Au(III) recovery was achieved with the use of activated carbon felt at a concentration of 500 mg L −1 within 30 min of operation with a flow rate of 50 mL min −1 . This was achieved at a fractional conversion of 1.00, where all the 2894 mol of Au were fully deposited at the cathode. This can be ascribed to the massive surface area and high porosity of carbon felt. Carbon felt has a specific surface area of 1229 cm 2 g −1 and a porosity of 94.81%. The morphological and compositional studies of the electrodeposited Au(III) onto activated carbon felt cathode material were also carried out.CONCLUSION: It is confirmed that Au(III) has been successfully deposited by cathodic reduction of Au(III) ions.

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“…The drawbacks of such a process limit further applications. Chloride metallurgy is emerging as an alternative process, which has been proven to be more efficient and cheaper for the extraction and used to refine precious, base, and refractory metals [10,11]. Up to now, few studies have been conducted to recover rare earth elements from waste phosphors by chlorination roasting, however, this method is particularly well-suited for the recovery of valuable metals in mineral processing.…”

Section: Introductionmentioning

confidence: 99%

Recovering Y and Eu from Waste Phosphors Using Chlorination Roasting—Water Leaching Process

Pang

Mei

et al. 2016

Minerals

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Recovering Y and Eu from waste phosphors using chlorination roasting followed by a water leaching process was investigated in this study. Firstly, by chlorination roasting and water leaching, Y and Eu elements present in waste phosphors were efficiently extracted into a leach solution. Secondly, the majority of the impurities in the solution can be removed by adjusting the pH to 4.5 using a Na 2 S and NH 3 ·H 2 O solution. Thirdly, the rare earths can be precipitated afterwards by adding a H 2 C 2 O 4 solution and adjusting the pH to 2.0. Then rare earth oxides (REOs) can be obtained after calcining at 800 • C for 1 h. The characterization study of the waste phosphors and the rare earth oxide products was performed by XRD, XRF, and SEM-EDS analysis to determine the phase and morphological features. Influences of the factors, such as roasting temperatures and time, the addition of ammonium chloride on the roasting of waste phosphors, as well as the pH and the amount of oxalates on the precipitation of Y and Eu, were investigated. The maximum grade (99.84%) of mixed rare earth oxides and recovery rate (87.35%) of Y and Eu were obtained at the optimized conditions.

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Gold extraction by chlorination using a pyrometallurgical process

Cited by 49 publications

References 4 publications

A review of metal recovery from spent petroleum catalysts and ash

A review of metal recovery from spent petroleum catalysts and ash

An innovative use of electrochemically modified three‐dimensional carbon felt for a rapid recovery of gold from diluted chloride solution

Recovering Y and Eu from Waste Phosphors Using Chlorination Roasting—Water Leaching Process

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