Gold and Silver Extraction

This experimental work aims at studying the effect of particle size on the microwave pre-treatment for the grindability of Bolkardag (Nigde, Turkey) gold ore for cyanide leaching. Three different particle size batches (−8 + 4.7 mm, −4.75 + 2 mm and −2 + 1 mm) were used for microwave treatment. Each sub-samples were exposed to four different power levels of microwave energy (0.09, 0.18, 0.36 and 0.6 kW) at exposure times of 5, 10, 15 and 30 minutes and then grindability characteristic of the treated samples were investigated with Berry and Bruce comparative grindability method. It was clearly seen that increasing power level and exposure time caused a reduction in comparative Bond Work index. A maximum reduction in Bond Work index (73.54%) was achieved by 0.6 kW at 30 minutes of microwave treatment. Compared to the untreated sample’s results, gold and silver extraction rates increased, using microwave-treated samples, about 7% and 9% after 77 hours cyanide leaching, respectively. Additionally, the hydrated lime added samples (after 0.6 kW at 30 minutes of microwave treatment) were used in the cyanide leaching tests to determine the possible effect. It was observed that there was no significant difference on leaching extraction rates using lime free or lime added samples. Applying microwave pre-treatment before cyanide leaching, the gold and silver extraction rates could be increased and also the cost of communition could be reduced due to easier breakage of the ore due to a significant decrease in Bond Work index.

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SILVER RECYCLING FROM PHOTO-PROCESSING WASTE USING ELECTRODEPOSITION METHOD

Indonesian Journal of Chemistry ◽

10.22146/ijc.21921 ◽

2010 ◽

Vol 2 (2) ◽

pp. 102-106

Author(s):

Mochammad Feri Hadiyanto ◽

Agus Kuncaka

Keyword(s):

Processing Waste ◽

Electrodeposition Method ◽

Constant Potential ◽

Silver Electrodeposition ◽

Silver Extraction

Silver electrodeposition of photo-processing waste and without addition of KCN 1,0 M has been studied for silver recycling. Photo procesing waste containing silver in form of [Ag(S2O3)2]3- was electrolysed at constant potential and faradic efficiency was determined at various of electrolysis times. Electrolysis of 100 mL photo processing waste without addition of KCN 1,0 M was carried out at constant potential 1.20 Volt, while electrolysis 100 mL photo procesing waste with addition of 10 mL KCN 1,0 M electrolysis was done at 1.30 Volt.The results showed that for silver electrodeposition from photo processing waste with addition of KCN 1,0 M was more favorable with faradic efficiency respectively were 93,16; 87,02; 74,74 and 78,35% for 30; 60; 90 and 120 minutes of electrolysis. Keywords: Silver extraction, electrodeposition, photo-processing waste

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Silver extraction using emulsion liquid membrane system containing D2EHPA-TBP as synergistic carrier: optimization through response surface methodology

Environmental Technology ◽

10.1080/09593330.2021.1972346 ◽

2021 ◽

pp. 1-9

Author(s):

Payam Ghorbanpour ◽

Mohsen Jahanshahi

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Liquid Membrane ◽

Membrane System ◽

Emulsion Liquid Membrane ◽

Silver Extraction

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Sulfation Roasting of a Bornite Flotation Concentrate to Optimize Silver Extraction in a Ferric Chloride Leach

Drying, Roasting, and Calcining of Minerals ◽

10.1007/978-3-319-48245-3_1 ◽

2015 ◽

pp. 3-10

Author(s):

Ryan J. Foy ◽

Steve Lloyd ◽

Brandon Steinborn ◽

Jerome P. Downey

Keyword(s):

Ferric Chloride ◽

Flotation Concentrate ◽

Sulfation Roasting ◽

Silver Extraction

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