anode slime leaching with thiourea

(PDF) A Review on the Recovery of Noble Metals from Anode ...

Feb 13, 2019· from a complex anode slime. It was found that thiourea is. easily decomposed in the presence of other base metals, ... leach liquor of anode slime by Cyanex272 (Xing et …

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Separative treatment of anode slime - Southwire Company

Referring more particularly to the drawing, it is seen that the overall process of the invention may be divided broadly into four concentrating units, as indicated by dashed circumscriptions A through D. Unit A receives the anode slime starting material and through amine leaching produces lead carbonate.

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Optimized Leaching Conditions for Selenium from Sar ...

mainly leaching, liquid-liquid extraction and reduction. The author employs decopperised slimes to extract silver, selenium, tellurium and gold. The decopperised anode slime is first leached with nitric acid at a concentration of about 4 to 9 M and at an elevated temperature between 40-115 °C to obtain a leach solution, in which, silver,

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[PDF] Leaching of Gold and Silver from Crushed Au-Ag ...

Au-Ag noble metal wastes represent a wide range of waste types and forms with various ballast elements and components. The thiourea process of gold and silver extraction from ores, concentrates or secondary raw materials con- sists of gold and silver leaching into the thiourea solution and the consequent precipitation of these metals from the solu- tion.

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Recovery of Gold and Silver from Copper Anode Slime ...

Leaching experiments of anode slime were performed with several inorganic acids (HCl, HNO_3 and H_2SO_4) together with thiourea and thiosulfate solution to recover gold and silver.

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Ag recovery from copper anode slime by acid leaching at ...

Mar 01, 2014· A way to recover Ag is nitric acid, thiourea or thiosulfate leaching of anode slime,,, . Leaching with KOH can remove As and Sb . Yavuz and Ziyadanogullari studied recovery of gold and silver from copper anode slime . The slime contained Cu, Te, Se in addition to Ag and Au.

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EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM ANODE SLIME

Extraction of gold, silver and copper from the copper electrorefining anode slime; separation of the metals, Global Symposium on Recycling, Waste Treatment and Clean Technology. Hait, J., Jana, R., Vinay, and al S., 2002. Some studies on sulfuric acid leaching of anode slimes with additives, Industrial Engineering Research, 41, 6593-6599.

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(PDF) Leaching of the Mixture of Metallic Gold and Silver

In order to develop a hydrometallurgical process to recover gold and silver from anode slime resulted from the treatment of copper sludge, leaching experiments of the anode slime were performed by ...

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Extraction of platinum and gold from copper anode slimes ...

The copper anode slime used in this work was obtained from a copper smelter located in Yunnan province of China. As presented in Table 1, the major elements contained in this slime were Cu, Sn, Sb, Ag, As, S, O, and Te, and the contents of Pt and Au were 93.76 g/t and 1812.15 g/t respectively. Fig.1 shows that this copper anode slime was

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Chemical Leaching of Silver from Diverse Resources.pdf ...

Leaching with thiosulfate Bin Xu et al. 26) reported the recovery of Ag, Au and Pd from de-copperized anode slime containing Sn, Pb and Sb with thiosulfate followed by sodium hydroxide and subsequent acetic acid pretreatment. It was found that Pb caused detrimental effect on the leaching …

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Cover October 2013 - Print

for treating anode slime by thiourea are lead concentrations <15% and Ag <0.5%. Thiourea leaching has been performed in hydrochloric, sulfuric and nitric acid media. Dissolution of gold and silver up to 97% was reported in a solution containing 20 g/dm 3 HCl, 0.2 g/dm H2O2 and 100 g/dm3 thiourea (Amer, 2002). Hait et al., 2002

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Chapter - L HYDROMETALLURGY & SOLUTION MINING

recovery of precious metal from anode slime occurs in alternative leaching agent (Wk wang et al.,1981). Most common leaching agent used in gold salvation in anode slime in aqueous media such as aqua regia (Wk Wang et al,1981), cyanide (Su Jianhua et al, 2002), thiourea (Omer Yavuz et al, 2007),

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Optimization of gold recovery from copper anode slime by ...

study related to recovery of gold from anode slime known as sec-ondary source has been reported so far. This is the first study re-ported in the literature to focus on the gold recovery from CAS by using ILs. In this study, the optimum leaching conditions for gold recovery were determined by using Taguchi experimental design method.

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Stephen FOLEY, et al. : Gold Extraction - Rex Research

The resulting data obviously shows almost completely extraction of gold and palladium from copper anode slime. EXAMPLE 10 Following 2 time leaching of 1.5 kg copper anode slime said in example 9, with 1.5 L of nitric acid (9 M) at 85° C. for 4 hours, the residue was washed with 0.4 L of water.

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US8663584B2 - Method and technique employing a novel ...

An extraction component enabling the concurrent recovery of gold and/or palladium selectively from a hydrochloric acid media containing the base metals and other contaminants. The disclosed extractant disclosed eliminates the conventional multi-step process for such extraction by providing for an extraction method which uses a single solvent extraction reagent.

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EXTRACTING SILVER FROM ANODE SLIME AFTER LEAD AND …

2009) published a review of anode slime processing, including anode slime leaching by sulfuric acid. Research on gold, silver and copper separation had been accomplished by Bard and Sobral (2008) using hydrochloric acid solution adding sodium hypochlorite solutions as an oxidizing agent. The goldand silver can be separated from the after slime

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CiteSeerX — PROCESSING OF COPPER ANODE-SLIMES FOR ...

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Processing of anodic slimes from an Egyptian copper electrorefining plant, exhibiting high contents of copper, lead, tin and silver has been presented. The proposed hydrometallurgical process consists of two leaching stages for extraction of copper with H2SO4 – O2 and silver with thiourea – Fe3+.

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US5271909A - Method of tellurium separation from copper ...

A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to 150 psi and at an elevated temperature between about 100° and 200° C. until copper, nickel and substantially all of the tellurium is dissolved, thereby forming a leach slurry, and contacting the ...

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US4283224A - Separative treatment of anode slime - Google ...

A hydrometallurgical process is provided for the separative treatment of electrometallurgical anode slime containing precious metals and substantial amounts of tin dioxide and lead sulfate. The process is especially suited for treatment of anode slimes from the electrorefining of secondary copper to recover about 85% of the metal value contained therein, especially tin and precious metals.

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of Critical, Strategic and High-Value Elements from By ...

Sep 21, 2020· Recent studies dealt with various treatments of copper anode slime (CAS) recovering targeted elements. Among various methods used, the treatment by H2SO4-O2 and thiourea was given by Amer [12]. Leaching processes of the CAS using H2SO4 and …

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Development of a hydrometallurgical process for the ...

Mar 20, 2019· Leaching of the anode slimes. In the leaching of the anode slimes with the mixture of hydrochloric acid and H 2 O 2, most of the metals in anode slime except Ag was completely dissolved [].Therefore, the real leaching solution was obtained at the optimum condition; 5 M HCl and 0.2 M H 2 O 2, reaction temperature of 90 °C, 100 μm particle size, reaction time of 2 h, pulp density of 10 g/L ...

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PROCESSING OF COPPER ANODE-SLIMES FOR …

1988), where thiourea leaching shows a good potential application to treat sulphide concentrates. A low toxicity of thiourea compared to cyanide is always mentioned as one of the motivations for developing the research in the field. MATERIAL Anode slime samples …

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Leaching of the Mixture of Metallic Gold and Silver

Compared with the traditional cyanide leaching, the mixtures of hydrochloric acid and oxidizing reagents are also effective in the leaching of gold from anode slime. However, some toxic gases were evolved during the leaching process and the reagents are seriously corrosive to to the instruments. Nonetheless, thiosulfate and thiourea

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Materials | Free Full-Text | Thermochemical Route for ...

The main components of the anode slime (CuAgSe, Cu2-xSeyS1-y, Ag3AuSe2) react with oxygen, producing mostly copper and selenium oxides as well as Ag-Au alloys as final products at temperatures higher than 500 °C. Selenium dioxide (SeO2) is volatilized and recovered in pure state by cooling the gaseous phase, whilst copper(II) oxide, silver ...

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Tellurium, from Copper Anode Slime to High Purity Product ...

Oct 06, 2020· Tellurium is a rare metalloid that is vastly produced from copper anode slime, which is a by-product of the copper electrorefining process. Choosing the proper recovery method strongly depends on the slimes composition, mineralogy, and tellurium concentration. In addition, correctly selecting the right method of leaching, purification, and precipitation in economic and environmental processing ...

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Leaching of gold and silver from anode slime with a ...

(2017). Leaching of gold and silver from anode slime with a mixture of hydrochloric acid and oxidizing agents. Geosystem Engineering: Vol. 20, No. 4, pp. 216-223.

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Comprehensive recoveries of selenium, copper, gold, silver ...

Aug 01, 2020· This paper presents a clean and economical hydrometallurgical process for recovering valuable elements from a copper anode slime, and the flowchart is shown in Fig. 1.First, H 2 SO 4-H 2 O 2 solution was used for dissolving selenium and copper, and they were successively recovered from leaching solution by Na 2 SO 3 reduction and iron powder replacement. Then, NaClO …

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v116n12a9 Extraction of copper and gold from anode slime ...

For the extraction of copper by leaching, the anode slime was heated and stirred with 4 M sulphuric acid in the presence of oxygen. Optimal conditions for recovery of copper were temperature 80°C, mixing time 5 hours, and oxygen flow rate 2 L/min, resulting in a copper recovery of 94.47%. Silver and selenium were dissolved by leaching anode slime

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