Gold recovery from shredder light fraction of E-waste recycling plant by flotation-ammonium thiosulfate leaching

2018 ◽  
Vol 77 ◽  
pp. 195-202 ◽  
Author(s):  
Sanghee Jeon ◽  
Mayumi Ito ◽  
Carlito Baltazar Tabelin ◽  
Rongrit Pongsumrankul ◽  
Naho Kitajima ◽  
...  
Keyword(s):  
Waste Recycling ◽  
Light Fraction ◽  
Gold Recovery ◽  
Ammonium Thiosulfate ◽  
Thiosulfate Leaching

A physical separation scheme to improve ammonium thiosulfate leaching of gold by separation of base metals in crushed mobile phones

2019 ◽  
Vol 138 ◽  
pp. 168-177 ◽  
Author(s):  
Sanghee Jeon ◽  
Mayumi Ito ◽  
Carlito Baltazar Tabelin ◽  
Rongrit Pongsumrankul ◽  
Shinya Tanaka ◽  
...  
Keyword(s):  
Mobile Phones ◽  
Separation Scheme ◽  
Base Metals ◽  
Physical Separation ◽  
Ammonium Thiosulfate ◽  
Thiosulfate Leaching

scholarly journals Flotation of Carbonaceous Matter from a Double Refractory Gold Ore: The Effect of MIBC on Flotation Performance and Kinetics

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1021
Author(s):  
Sugyeong Lee ◽  
Charlotte E. Gibson ◽  
Ahmad Ghahreman
Keyword(s):  
Bubble Size ◽  
Gold Recovery ◽  
Carbonaceous Matter ◽  
Flotation Kinetics ◽  
Pressure Oxidation ◽  
Gold Ore ◽  
Refractory Gold ◽  
Flotation Performance ◽  
Thiosulfate Leaching

The use of alkaline pressure oxidation to pretreat refractory gold ore often results in insufficient gold recovery (<60%) in downstream thiosulfate leaching. To improve gold recovery, flotation was considered for the separation of carbonaceous matter (C-matter). In this study, the effect of MIBC on C-matter flotation was investigated to understand the role of the frother in bubble and froth formation and on flotation kinetics. MIBC dosages between 30 and 150 g/t were used in combination with 500 g/t of kerosene as a collector. The results showed that the recovery and selectivity of C-matter were improved with increasing MIBC dosages. Improved selectivity at higher MIBC dosages was attributed to faster C-matter recovery as bubble size decreased to the critical coalescence concentration (CCC) and to changes to the foam structure. Analysis of flotation kinetics showed that the flotation rate increased as the MIBC dosage increased due to the decreasing bubble size and the reduced induction time caused by the interaction between the collector and the frother. The results of this study explain the role of MIBC in C-matter flotation and can be used as a design basis for scavenger-cleaner flotation testing. Overall, the results show the potential for flotation as a means to improve gold recovery in thiosulfate leaching through the removal of C-matter.

Interference of coexisting copper and aluminum on the ammonium thiosulfate leaching of gold from printed circuit boards of waste mobile phones

2018 ◽  
Vol 81 ◽  
pp. 148-156 ◽  
Author(s):  
Sanghee Jeon ◽  
Carlito Baltazar Tabelin ◽  
Hirotaka Takahashi ◽  
Ilhwan Park ◽  
Mayumi Ito ◽  
...  
Keyword(s):  
Mobile Phones ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Ammonium Thiosulfate ◽  
Thiosulfate Leaching

Thermodynamic analysis of the copper (I) homogeneous and heterogeneous speciation in ammonium thiosulfate leaching systems

2019 ◽  
Vol 97 (9) ◽  
pp. 651-658 ◽  
Author(s):  
Igor Povar ◽  
Stefano Ubaldini ◽  
Oxana Spinu ◽  
Tudor Lupascu
Keyword(s):  
Complex Formation ◽  
Thermodynamic Analysis ◽  
Mixed Ligand Complex ◽  
Chemical Species ◽  
Mixed Ligand ◽  
Phase System ◽  
Ligand Complex ◽  
Complex Species ◽  
Ammonium Thiosulfate ◽  
Thiosulfate Leaching

The paper presents a new thermodynamic approach to studying mixed ligand complex formation reactions in the multi-component two-phase system “cuprous oxide-ammoniacal copper (I) thiosulfate aqueous solution” under real conditions. The quintessence of the developed approach consists in the thermodynamic analysis of concurrent reactions in the heterogeneous system Cu(I) – NH3 – S2O32− – H2O on the basis of the introduced notion of generalized reaction equations. A detailed thermodynamic analysis in ammonium thiosulfate leaching systems has considered the formation of mixed ligand complex species Cu(OH)i(NH3)j(S2O3)k. The new feature is to focus on the chemical description of the overall process of complex formation consisting of a series of concurrent reactions, where the nature and ratio of the concentrations of chemical species, formed in such reactions, depend on the ratio of the concentrations of the metal Cu+ and ligands, temperature, and other thermodynamic parameters. On the basis of the selected thermodynamic data for involved species, the thermodynamic stability areas of solid phase and the repartition of soluble and insoluble chemical species towards the solution pH and a number of total reagent concentrations in heterogeneous mixtures have been investigated. The diagrams of heterogeneous and homogeneous chemical equilibria are used for the graphical representation of complex equilibria and distribution of soluble and insoluble species in examined systems. The used approach utilizes thermodynamic relationships coupled with original mass balance constraints, where the solid phases are explicitly expressed. The obtained results are useful for optimization of the overall scheme of thiosulfate leaching in gold hydrometallurgy to minimize reagent consumption and maximize gold extraction.

scholarly journals A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution

Metals ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 222 ◽  
Author(s):  
Bin Xu ◽  
Wenhao Kong ◽  
Qian Li ◽  
Yongbin Yang ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Gold Recovery ◽  
Thiosulfate Leaching ◽  
Pregnant Solution

scholarly journals The treatment of copper–gold ores by ammonium thiosulfate leaching

2002 ◽  
Vol 66 (1-3) ◽  
pp. 1-21 ◽  
Author(s):  
Ellen Molleman ◽  
David Dreisinger
Keyword(s):  
Gold Ores ◽  
Ammonium Thiosulfate ◽  
Copper Gold ◽  
Thiosulfate Leaching

scholarly journals Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for Gold Extraction

2004 ◽  
Vol 45 (2) ◽  
pp. 516-526 ◽  
Author(s):  
Harunobu Arima ◽  
Toyohisa Fujita ◽  
Wan-Tai Yen
Keyword(s):  
Gold Extraction ◽  
Ammonium Thiosulfate ◽  
Thiosulfate Leaching

scholarly journals Leaching Behavior of Gold and Silver from Concentrated Sulfide Ore Using Ammonium Thiosulfate

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1029
Author(s):  
Mooki Bae ◽  
Sookyung Kim ◽  
Jeongsoo Sohn ◽  
Donghyo Yang ◽  
Hyunju Lee
Keyword(s):  
Liquid Ratio ◽  
Leaching Behavior ◽  
Gold Ores ◽  
Ammonium Thiosulfate ◽  
Sulfide Ore ◽  
Main Chemical Composition ◽  
Hydrometallurgical Treatment ◽  
Thiosulfate Leaching ◽  
Leaching Efficiency ◽  
Thiosulfate Concentration

Ammonium thiosulfate is an alternative lixiviant for the hydrometallurgical treatment of sulfide gold ores. The present study is primarily focused on ammonium thiosulfate leaching of gold (Au) and silver (Ag) from the sulfide ore (Sunshin mine in Korea). The main chemical composition of the concentrate was Au (84 ppm), Ag (852 ppm), Fe (18.9%), Si (23.2%), and S (21.1%). The effects of various parameters on the process, such as leaching time (1–4 h), ammonium thiosulfate concentration (0.05–0.5 M), copper sulfate (CuSO4), concentration (0.05–0.25 M), solid to liquid ratio (0.2–0.5), and reaction temperature (40–60 °C) were systematically examined. Optimum Au leaching efficiency (>99%) was obtained under the following leaching conditions: 0.5 M ammonium thiosulfate with 0.05 M CuSO4 concentration, 0.2 S/L ratio at 60 °C for 2 h. The results indicate that the behavior of Ag was similar to that of Au. Almost complete dissolution of Ag occurred under following leaching conditions: 0.5 M ammonium thiosulfate with 0.05 M CuSO4 concentration at 60 °C for 4 h. This study would be useful in understanding the eco-friendly leaching systems of Au and Ag during the hydrometallurgical process of sulfide gold ore.

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