anode slime leaching with thiourea

CN106967884B - A kind of method of silver separating ...

The invention discloses a kind of methods of silver separating residue of copper anode slime step by step arithmetic, belong to Copper making Comprehensive Recovery Technology field.The present invention divides gold, silver, lead by villaumite, and carbonic acid conversion -- salt Ore Leaching divides barium, the effectively efficiently concentrating of realization lead, barium, the ...

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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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separation of gold from copper

So, the main objective of the current work is gold separation from copper anode slime as a rich secondary source of gold by determining the mechanism of the reaction between thiourea (TU) and Hydrogen peroxide (H۲O۲) in the thiourea leaching of gold. Thiourea can form cationic complex with gold in gold extraction process from copper anode slime.

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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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Recovery of Silver, Gold, and Lead From a Complex Sulfide ...

Typical thiourea leach residue analysis..... 6 7. Effect of residue pulp density ... current density of 100 A/m2 • Spent FeCl3 leach solution was reoxidized in the anode compartment at a current efficiency between 75 and 95 pct. 'Group supervisor. 2Research supervisor. Salt Lake City Research Center, Bureau of Mines, Salt Lake City, UT. ...

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GOLD EXTRACTION FROM ELECTRONIC SCRAP

During Cu-electrolyses the gold is concentrated in anode slime. The anode slime is smelting and casting the Au/anodes from which is possible, by Au - electrolysis, to obtain gold with 99,99 % purity and 99,74 ... contacts would thiourea solution (B) versus time Leaching efficiency of gold contacts was only about 4.1%. Composition of leaching ...

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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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Recovery of Silver and Gold from Copper Anode Slimes, JOM ...

It was then followed by alkaline roasting roasting, and sodium salt roasting are the main with K CO at 600 C and water leaching to remove 2 3 pyrometallurgical-based pretreatment methods for Se. Subsequent steps, such as H SO leaching and 2 4 anode slime processing. HCl leaching, were employed to remove Cu and Te.

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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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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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PRESSURE LEACHING OF DECOPPERIZED COPPER …

experiments. For each test 160, 240 or 320 g of anode slime was weighed and fed into the reactor chamber along with sulfuric acid. The solid concentrations were chosen according to Doucet and Stafiej (2007) who used the range from 27 to 35%. In order to achieve the optimal leaching conditions, an agitation speed of 400 rpm was used to

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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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Gold recovery from copper anode slime by means of ...

Thiourea powder, hydrogen peroxide (30%) (as the oxidizing agent), and sulfuric acid (98%) (for pH adjustment) were used for gold leaching with thiourea. In the next step, 5 g of the pretreated copper anode slime was added to the thiourea solution, and the resulting solution was then stirred for 24 h at 500 rpm.

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PROCESSING OF COPPER ANODE-SLIMES FOR EXTRACTION …

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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US6602319B1 - Process for the recovery of gold and silver ...

The present invention relates to a process for the recovery of gold and silver from the used refractory bricks of Dore furnace. This invention particularly relates to a process for the recovery of gold and silver from the used refractory bricks generated during the processing of the anode slimes of copper industry, through a non-cyanide route.

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AQUEOUS ELECTROTECHNOLOGIES: PROGRESS IN THEORY AND ...

Blister copper is processed in an anode plant equipped with two 365 st. tilting reverberatory furnaces, a 26 mold casting wheel and an anode press machine. Copper is electrorefined in a tank house equipped with 768 commercial cells, 44 stripper cells and 40 liberator cells, utilizing two electrolyte circuits and a 21,000 ampere rectifier.

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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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(PDF) Leaching of Gold and Silver from Anode Slime with ...

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 …

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Using thiourea ligand of gold-thiourea complex to facile ...

This study investigates a new method of [email protected] core–shell nanoparticle (SGNP) synthesis using copper anode slime as a secondary source of gold. Thiourea can form cationic complex with gold in gold extraction process of copper anode slime. Silica nanoparticles were used as cores and their surface was coated by a cationic gold-thiourea solution. The electrostatic interaction between ...

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Hydrochemically separation of gold from Copper Anode Slime ...

Thiourea can form cationic complex with gold in gold extraction process from copper anode slime. Thiourea consumption levels were also examined during the leaching operations for different leaching parameters, i.e. solution volume, concentration ratio of thiourea/H۲O۲, pH, leaching …

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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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US9630844B2 - Hydrometallurgical process for the recovery ...

anode slime leaching Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires Application number US14/463,598 Other versions US20150053572A1 (en Inventor ...

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

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 a mixture of HCl and some oxidizing agents (H 2 O 2, NaClO, and HNO 3).Effect of the concentration of oxidizing agents, reaction temperature and time, pulp density and stirring speed on the leaching ...

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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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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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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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HYDROMETALLURGICAL PROCESSING OF ANODE SLIMES …

2.2. The leaching behaviour of the anode slime Samples were examined in two steps. Application of hydrochloric acid at the first stage targeted the selective removal of the metallic tin component from the collected slime.The analysis of the anode slime samples …

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Processing of anode slime with deep eutectic solvents as a ...

To improve the gold recovery from copper anode slime, DESs prepared from choline chloride and hydrogen bond donors such as thiourea and citric acid can be used as leaching agents and high temperature (below the decomposition point) can be performed as …

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Chemical synthesis of gold nanoparticles with different ...

Preparation of gold-thiourea solution. Leaching tests were carried out by thiourea powder as the selective leachate, hydrogen peroxide (30 %) as the oxidizing agent, and sulfuric acid (98 %) for pH adjustment. The washed copper anode slime was added to the thiourea solution and the solution was agitated with a magnetic stirrer at room temperature.

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Recovery of scattered and precious metals from copper ...

Ranjbar et al. (2014) used a thiourea solution to completely dissolve Au in the anode slime, but thiourea is easily to decomposed in the presence of oxidizing metal ions such as Cu 2+ and Fe 3+, resulting in high reagent consumption. Moreover, leaching is normally carried out in the pH range of 1–2, because, although the reagent is fairly ...

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

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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