Leaching of gold and silver from Miller Process dross through non-cyanide leachants

Murthy, D. S. Ramachandra; Prasad, P. M.

doi:10.1016/0304-386x(95)00049-m

Cited by 42 publications

(20 citation statements)

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“…In addition, recovery of Ag by using the present proceeding avoids using toxic chemicals and restricted disposal problems compared with that from cyanide medium. 6,9,31) Thus, the present studied proceeding is more environmental friendly and has potential to be applied in practice.…”

Section: Proposal Of the Recovery Proceedingmentioning

confidence: 90%

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al2O3 Catalyst by Solvent Extraction and Reduction

2017

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Nitric acid was employed to strip silver from loaded 5,8-diethyl-7-hydroxy-dodecan-6-oxime (LIX63) in the recovery of silver from a leaching solution of a spent Ag/α-Al 2 O 3 catalyst. The loaded LIX63 was obtained by contacting the real leaching solution with 0.5 mol/dm 3 LIX63 diluted in kerosene. In order to produce silver powder by reduction, the HNO 3 in the stripping solution was recovered by extraction with tri 2-ethylhexyl amine (TEHA) followed by stripping with distilled water. Silver powder was obtained by reduction with 0.1 mol/dm 3 L-ascorbic acid. A owsheet was proposed to recover Ag from the leaching solution of the spent Ag/α-Al 2 O 3 catalyst by solvent extraction and reduction with minimum waste emissions.

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Section: Proposal Of the Recovery Proceedingmentioning

confidence: 90%

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al2O3 Catalyst by Solvent Extraction and Reduction

2017

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“…During the refining process, small amount of the metal diffuses into the crucible. At the end of its life cycle, crucibles are crushed and grinded, and the grounded material is called dross . Gold and silver are recovered from dross, using density difference by washing on James tables.…”

Section: Introductionmentioning

confidence: 99%

“…At the end of its life cycle, crucibles are crushed and grinded, and the grounded material is called dross. [1] Gold and silver are recovered from dross, using density difference by washing on James tables. The concentration of gold and silver in the washed dross is generally higher than the concentration in their corresponding ores.…”

Section: Introductionmentioning

confidence: 99%

Determination of gold and silver in dross using EDXRF technique

et al. 2014

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Gold and silver in dross were determined by energy-dispersive X-ray fluorescence technique. Sample was prepared by pressed pellet method using microcrystalline cellulose powder as binder, and a method of standard additions was used for quantification. L β X-ray of gold (11.4 keV) and K β X-ray of silver (24.9 keV) were used for analysis. The measured concentrations of gold and silver were 132 ± 8 and 1181 ± 84 mg kg À1, respectively. The results were validated by instrumental neutron activation analysis technique. The t-test indicated that there was no significant difference between results obtained by the two techniques. Energy-dispersive X-ray fluorescence is a simple, precise and accurate technique for the determination of gold and silver in dross.

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“…하지만 차아염소산은 이들 반응실험 보다 결과가 빠르고, 독성이 상대적으로 적기 때문 에 시안의 대체 용매제로 사용되었다 (Murthy and Prasad, 1996;Senanayake, 2004). 그러나 금 용출 은 현장(in situ)에서 염소 가스를 발생시켜 사용하 기 때문에 작업자가 염소가스에 노출될 수 있다 (Hilson and Monhemius, 2006).…”

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“…특히 소금(NaCl)을 정광에 혼합하여 소성시키면 금 용출율이 더욱 더 향상되는 것으로 보고되었다 (Murthy and Prasad, 1996). 우리나라에서 저항성 금 정광으 로부터 염소-차아염소산 용액을 이용한 금과 은 용 출에 관한 연구는 (Cho et al, 2012) (Murthy and Prasad, 1996) (Zivkovic et al, 1996;Bandyopadhyay et al, 2000). 정광에 소금(NaCl)을 30% 혼합하고, 이를 750℃로 2시간 동안 소성시킨 결과 석영, 적철석, 소 금(halite) 및 난토카이트(CuCl) 등이 관찰되었다(그 림 1c).…”

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Mineralogical Phase Transform of Salt-roasted Concentrate and Enhancement of Gold Leaching by Chlorine-hypochlorite Solution

Kim¹,

Cho²,

Oh³

et al. 2013

Journal of the Mineralogical Society of Korea

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: In order to optimize the gold leaching process from refractory sulfide concentrate, a chlorine-hypochlorite solution with varying concentrations and temperatures were applied to salt-roasted concentrate. The concentrate consisted of pyrite, chalcopyrite, and galena, which were turned into hematite through air-roasting at 750℃. Also these concentrates were changed into hematite and nantokite (CuCl)) through salt (NaCl)-roasting at 750℃. The results of the gold leaching experiments showed that the best gold leaching parameters were obtained when the hydrochloric acid-sodium hypochlorite mix was at a ratio of 1 : 2, the added concentration was 1.0 M concentration, the pulp density was 1.0%, and the leaching was done at a 60℃ leaching temperature. The leaching rate for gold was much greater in the roasted concentrate than in the raw concentrate. The leaching rate was greater in the salt-roasted concentrate than in the plain roasted concentrate too. From XRD analysis, quartz was found in the saltroasted concentrate and in the solid residue from the chlorine-hypochlorite leaching solution at 60℃.

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Leaching of gold and silver from Miller Process dross through non-cyanide leachants

Cited by 42 publications

References 1 publication

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al<sub>2</sub>O<sub>3</sub> Catalyst by Solvent Extraction and Reduction

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al<sub>2</sub>O<sub>3</sub> Catalyst by Solvent Extraction and Reduction

Determination of gold and silver in dross using EDXRF technique

Mineralogical Phase Transform of Salt-roasted Concentrate and Enhancement of Gold Leaching by Chlorine-hypochlorite Solution

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