anode slime leaching with thiourea

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leaching experiment, the pressure was decreased, autoclave cooled down and the leach residue filtered, washed and dried. Table 2. Test conditions for pressurized WPCB leaching (tests 1–10), pressurized anode slime leaching (tests 11, 12), atmospheric WPCB leaching (tests 13–16) and pressurized PS leaching (tests 17–20)

Pressure leaching of selenium and tellurium from scrap ...

Feb 15, 2007· This study has shown that gold and silver can be recovered from a complex anode slime containing copper, selenium, and tellurium, but a carefully planned leaching procedure is required. To extract the gold with thiourea, it is necessary to first remove the copper, selenium, tellurium, and most of the silver from the mixture. Once these elements are removed, the gold and most of the remaining ...

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.

Research on Process of Hydrometallurgical Extracting Au ...

Anode slime is produced during the electrorefining of impure copper anodes to produce pure copper cathodes.26,27 The insoluble impurities of the copper anodes are collected at the bottom of the electrolysis cell as a slime. Depending on the production process of the copper anodes, the slime contains copper, nickel, tin, antimony,

EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM …

The backscattered electron image of the scrap Cu anode slime and EDS analysis of the marked particle are presented in Fig. 2 and Table 2, respectively.The brightest particles (spot 5) exhibit high concentrations of S, O, and Pb, thus confirming the presence of the PbSO 4 phase. Similarly, the grey particles (spots 2 and 4) can be identified as the SnO 2 and BaSO 4 phases.

Mineralogical Characteristics of Copper Electrorefining ...

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

Recovery of Gold and Silver from Tin-Rich Slag: Mineral ...

Mar 01, 2014· 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.

EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM …

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.

PROCESSING OF COPPER ANODE-SLIMES FOR EXTRACTION …

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, .

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

Abstract. Copper anode slime is an increasingly significant resource for precious metals such as Au, Ag and Pd. The extraction of Au, Ag and Pd from decopperized anode slime by different pretreatments and different lixiviants including cyanide, chloride, thiourea and thiosulfate have been investigated.

Chapter - L HYDROMETALLURGY & SOLUTION MINING

Lead Anode Slime TreatmentLead. Whereas the lead anode slime is firstly treated with chloride leaching and then the leaching residue can be mixed with deselenium and decoppered copper anode slime for further recovery. The chloride leaching solution of lead anode slime is used to recover Cu/ Bi/Sb separately. Get Price

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

(Thiourea and gelatin ) etc.[4] Characteristics of the Secondary Copper Anodes ... Before the leaching, the decoppered anode slime was washed several times, filtered and then dried at laboratory in the respective types of equipment. Samples of the dried anode slime are given in Fig. 4.

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.

Optimization of the synergy between reduction leaching of ...

To extract gold and silver from a copper anode slime with about 15% tin in a plant using the traditional pyrometallurgy-electrorefining technique, the recovery is only 90%. The rest of the gold and silver is lost in the slag which contains mainly SnO2, PbO, and Sb2O3 In the present work, a process is developed to recover the gold and silver further.

Copper Anode Slime Recovery-Copper- - Metalcess

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

(PDF) Extraction of copper and gold from anode slime of ...

Apr 02, 2004· A new approach for the treatment of copper electrorefining anode slime based on hydrometallurgical route involving sulfuric acid leaching with additives such as manganese dioxide and sodium chloride has been developed at National Metallurgical Laboratory (NML), Jamshedpur, India. Mineralogical characterization of the anode slime and the residues after various leaching treatments, …

Anode Slime Gained During Electrolysis Process of ...

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, .

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

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 ...

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

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. ...

Development of a hydrometallurgical process for the ...

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),