thiourea leaching of a copper gold ore using statistical

Thiourea leaching of a copper-gold ore using statistical ...

1998-1-1 · ELSEVIER Hydrometallurgy 47 (1998) 189-203 hydrometallurgy Thiourea leaching of a copper-gold ore using statistical design Pierre Lacoste-Bouchet a, Guy Desch~nes b, Edward Ghali c,, a Agnico Eagle, Cadillac, Quebec, Canada b CANMET, Ottawa, Ontario, Canada c Laval University, Quebec City, Quebec, Canada Received 16 September 1996; accepted 16 June 1997 Abstract

Thiourea leaching of a copper-gold ore using statistical ...

Thiourea was used to leach gold from ore containing 0.4% Cu and 5.6 g/t Au. The parameters studied were acid pretreatment, leaching time, pH, thiourea concentration and the oxidizing agents used. Gold extraction was 89% and thiourea consumption was 3.9 kg/t. No acid consumption was observed during leaching at pH 3.

Gold electrowinning from thiourea solutions - ScienceDirect

2000-9-1 · Thiourea leaching of a copper-gold ore using statistical design Hydrometallurgy , 47 ( 1998 ) , pp. 189 - 203 Article Download PDF View Record in Scopus Google Scholar

廢IC中貴金屬資源回收之研究 湯麗雯、李清華,蔡尚林 - dyu ...

2014-12-16 · 645-653, 1999. 19.PIERRE LACOSTE-BOUCHET, GUY DESCHENES, EDWARD GHWARED,"THIOUREA LEACHING OF A COPPER- GOLD ORE USING STATISTICAL DESIGN", HYDROMETALLURGY, VOL. 47, PP. 189-203, 1998. 20.GEORGE OWUSU,"SELECTIVE EXTRACTION OF COPPER FROM ACIDIC ZINC SULFATE LEACH SOLUTION US -ING LIX 622",

Thiourea Gold Leaching - Metallurgist & Mineral

2017-8-12 · Thiourea Consumption during Gold Leaching. The use of thiourea, (CS (NH2)2 as a complexing/extracting agent for gold and other precious metals has

Study on mechanism of gold leaching by thiourea in the ...

Langhans J W, Lei K P V, Carnahan T G. Copper-catalyzed thiosulfate leaching of low grade gold ores[J]. Hydrometallurgy, 1992, 29: 191. Article Google Scholar [3] Zipperian D, Raghavan S, Wilson J P. Gold and silver extraction by ammonium thiosulfate leaching from a

Reaction chemistry of gold leaching in thiourea solution ...

2002-12-1 · This study was carried out on a finely disseminated gold-bearing ore from Kaymaz, Turkey. The main objective was to determine the mechanism of reaction between thiourea and Fe 3+ in the thiourea leaching of gold. Thiourea consumption levels were also examined during the leaching operations for different leaching parameters, i.e., molar ratio of ferric sulfate/thiourea, pH, and

A study of the leaching of gold and silver by ...

1980-2-1 · Abstract. The method of thiourea leaching for the extraction of gold and silver from ore in acidic medium was studied. The effect of various amounts of oxidant was also investigated. It was found using a rotating disk experiment that when the leaching solution contained 1.0% thiourea, 0.5% sulfuric acid and 0.1% ferric ions, the rate of gold ...

Recovery of Silver, Gold, and Lead From a Complex

RECOVERY OF SILVER, GOLD, AND LEAD FROM A COMPLEX SULFIDE ORE USING FERRIC CHLORIDE, THIOUREA, AND BRINE LEACH SOLUTIONS By R. G. Sandberg 1 and J. L. Huiatt 2 ABSTRACT The Bureau of Mines investigated a hydrometallurgical procedure to re­ cover gold, silver, and byproduct lead from a complex lead-zinc sulfide ore.

Comparative leaching of a sulfidic gold ore in ionic ...

Leaching with the mixture of ionic liquid and aqueous acid J.A. Whitehead et al. 43) compared the leaching process of silver and gold from a sulfidic gold ore in the presence of oxidant (HSO 5 − ...

Thiosulfate Leaching of Gold from Copper Bearing Ores

2018-5-26 · Thiourea leaching from an oxidized gold-copper ore with 90-95% gold extraction was also reported (McInnes et al., 1989). However, acid pre-leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

(PDF) Leaching of OvacIk gold ore with cyanide, thiourea ...

Extraction of gold from a Carlin type ore using thiourea, gold and silver leaching, recovery, and economics. In: Proceedings of the 110th AIME Meeting, Chicago. pp. 93-108. The ammoniacal ...

廢IC中貴金屬資源回收之研究 湯麗雯、李清華,蔡尚林 - dyu ...

2014-12-16 · 645-653, 1999. 19.PIERRE LACOSTE-BOUCHET, GUY DESCHENES, EDWARD GHWARED,"THIOUREA LEACHING OF A COPPER- GOLD ORE USING STATISTICAL DESIGN", HYDROMETALLURGY, VOL. 47, PP. 189-203, 1998. 20.GEORGE OWUSU,"SELECTIVE EXTRACTION OF COPPER FROM ACIDIC ZINC SULFATE LEACH SOLUTION US -ING LIX 622",

Analysis and Prediction of the Thiourea Gold Leaching ...

2020-9-15 · minerals Article Analysis and Prediction of the Thiourea Gold Leaching Process Using Grey Relational Analysis and Artificial Neural Networks Rui Xu 1,y, Xiaolong Nan 2,y, Feiyu Meng 1,*, Qian Li 1,*, Xuling Chen 1, Yongbin Yang 1, Bin Xu 1 and Tao Jiang 1 1 School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; ...

Recovery of Silver, Gold, and Lead From a Complex

RECOVERY OF SILVER, GOLD, AND LEAD FROM A COMPLEX SULFIDE ORE USING FERRIC CHLORIDE, THIOUREA, AND BRINE LEACH SOLUTIONS By R. G. Sandberg 1 and J. L. Huiatt 2 ABSTRACT The Bureau of Mines investigated a hydrometallurgical procedure to re­ cover gold, silver, and byproduct lead from a complex lead-zinc sulfide ore.

Reduction of Thiourea Consumption in Gold Extraction by ...

1997-7-2 · The thiourea leaching of gold and silver from the gold-bearing silicate ore of the Hishikari mine (Kagoshima, Japan) was studied. The apparent activation energy of the extraction of gold and silver was smaller than that of the reaction rate of thiourea consumption by ferric iron. We carried out the leaching after the leaching solution was preserved for several hours. The gold recovery at 288 K ...

Thiourea leaching gold and silver from the printed circuit ...

2012-6-1 · 2.3. Leaching experiments. The powdered waste PCBs samples were pretreated, filtered, and dried according to the following procedure. The leaching of gold and silver were carried out in the beaker containing the pretreatment power and 40 mL of leaching solution (the mixture solution of thiourea and ferric ion) using 0.5 mol/L sulfuric acid for pH adjustment.

Thiourea Leaching of Gold and Silver — Technology

Leaching with a relatively concentrated thiourea solution (1MCS (NH 2) 2) resulted in 83% gold and 75% silver extraction in four hours. With the treated flue dust residue, gold extraction was about 60%. Gold and silver extraction with cyanide was sensitive to both cyanide concentration and oxidizing conditions.

GOLD LECHING FROM A SAUDI ORE BY THE

2014-9-8 · leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.

G. DESCHÊNES | Principal Engineer, Precious metals ...

To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH4)2S2O3, 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. ... Thiourea leaching of a copper ...

Thiosulfate Leaching of Gold from Copper Bearing Ores

2018-5-26 · Thiourea leaching from an oxidized gold-copper ore with 90-95% gold extraction was also reported (McInnes et al., 1989). However, acid pre-leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

(PDF) Leaching of OvacIk gold ore with cyanide, thiourea ...

Extraction of gold from a Carlin type ore using thiourea, gold and silver leaching, recovery, and economics. In: Proceedings of the 110th AIME Meeting, Chicago. pp. 93-108. The ammoniacal ...

Ammoniacal thiosulfate leaching of gold from a

gold from a ground ore (-38 µm) over a period of 24 h. Statistical analysis confirmed the leaching of gold improved with increasing concentrations of thiosulfate and ammonia.

Reduction of Thiourea Consumption in Gold Extraction by ...

1997-7-2 · The thiourea leaching of gold and silver from the gold-bearing silicate ore of the Hishikari mine (Kagoshima, Japan) was studied. The apparent activation energy of the extraction of gold and silver was smaller than that of the reaction rate of thiourea consumption by ferric iron. We carried out the leaching after the leaching solution was preserved for several hours. The gold recovery at 288 K ...

GOLD LECHING FROM A SAUDI ORE BY THE

2014-9-8 · leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.

廢IC中貴金屬資源回收之研究 湯麗雯、李清華,蔡尚林 - dyu ...

2014-12-16 · 645-653, 1999. 19.PIERRE LACOSTE-BOUCHET, GUY DESCHENES, EDWARD GHWARED,"THIOUREA LEACHING OF A COPPER- GOLD ORE USING STATISTICAL DESIGN", HYDROMETALLURGY, VOL. 47, PP. 189-203, 1998. 20.GEORGE OWUSU,"SELECTIVE EXTRACTION OF COPPER FROM ACIDIC ZINC SULFATE LEACH SOLUTION US -ING LIX 622",

G. DESCHÊNES | Principal Engineer, Precious metals ...

To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH4)2S2O3, 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. ... Thiourea leaching of a copper ...

Thiourea Silver Leaching - Mineral Processing & Metallurgy

2018-4-15 · Thiourea Silver Leaching. Unlike base metals which are readily soluble in mineral acids, noble metals like gold and silver require the presence of oxidizing and complexing agents for dissolution. Silver approaches base metal behavior in acidic

SciELO - Brasil - A statistical approach to the ...

A statistical approach to the experimental design of the sulfuric acid leaching of gold-copper ore. F.D.Mendes; A.H.Martins * * To whom correspondece should be addressed . Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal de Minas Gerais, Phone (0055) (31) 3238-1053, Fax: (0055) (31) 3238-1815,Belo Horizonte - Minas Gerais (MG), CEP 30160-030, Brazil, E-mail ...

Response of low-grade gold ore to cyanidation and

2017-6-23 · The acidic leaching using thiourea, required more chemical reagents and maximum gold recovery of 90.48% was achieved with thiourea consumption, leaching time, and pH equal to 13.32 kg/t, 5 h, and 1.7, respectively.

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