The second part examines the effects of anode chemistry and thiourea addition on the ductility of electrorefined copper starter sheet. In part one, a laboratory cell was used to simulate a short cycle electrowinning cell via chronopotentiometric operation with an IrO. 2Ta. 2. O. 5. CTA at 40°C. A cyclic voltammetric sweep was applied after chronopotentiometry to remove any species which had ...

ABSTRACT: Simulated leaching solution of tin anode slime was prepared as electrolyte to investigate the performance of cyclone electrowinning on extraction of tin from solution in this work. The results showed that Sn(II) could be extracted as sponge tin with cyclone electrowinning. Sn(IV) could be extracted as tin plate. As the concentration of tin chloride solution was lower, the current ...

The kinetic study of nonoxidative leaching of cinnabar concentrate ore in aqueous hydrochloric acidthiourea solutions is presented. The dissolution rates were investigated over a temperature range of 60 to 100 °C, at an acid concentration of 0 to 5 M and thiourea concentration ranging from to M at atmospheric dissolution rate is of the second order for thiourea ...

 · The reduction leaching of manganese anode slime and the oxidative decomposition of pyrite and arsenopyrite could be realized simultaneously by the synergistic action of the two ores. The effects of time, mass ratio of two ores, concentration of sulphuric acid and temperature on the leaching rate of manganese were investigated. The optimum technological conditions were determined as .

In practice, thiourea leaching of gold is typically performed at thiourea concentrations of M (10 g/L), ferric ion concentrations of M (5 g/L), pH values of 1–3 and at potentials between and V (vs. SHE). Get Price. EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM ANODE SLIME. Extracting the gold from anode slime had been attempted in the laboratory by applying wet ...

 · Thiourea leaching experiments were carried out in a jacketed reactor with 250 mL internal volume and monitored with a pH meter (NEL890). Constant temperature operations were maintained with a thermostat (Frigomix 1495). RESULTS AND DISCUSSION. Removal of Copper, Silver, and Gold. The first step in this approach was to remove the copper from the anode slime [a mixture of roasted .

anode: carbon anodes have a specific situation in aluminium smelting and depending on the type of anode, anode slime leaching with thiourea; Get Price + cover october 2013 print . anode slime is a byproduct collected from electro refining copper process. the valuable metals present in the valuable metals present in the slime are au, ag, pt, pd and pb. yet, the slime has not been processed in ...

(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. 216223.

Leaching of gold in the anode slimes is affected by some elements such as silver, copper, iron, and selenium. The anode slime was first washed with 4 M sulphuric acid to remove all the copper. Sulphuric acid was then added to anode slime in a 1:10 (solid to liquid) phase ratio and the mixture heated on a hotplate in the presence of oxygen while being stirred with a magnetic stirrer. In this ...

Leaching of the anode slime with either HCl or HNO. 3. solutions is characterized by the rate the major components are dissolved. The efficiency of HCl leaching is illustrated by Figs. 46 for three HCl concentrations and three temperatures. Fig. 4 Leaching of Sn and Cu from the slime with 6 M HCl at 75 (a) 85 b) and 100 (c) o. C . a) cb) ) a) b )c. Fig. 5 Leaching of Sn and Cu from the slime ...

[randpic] (PDF) Leaching of Gold and Silver from 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 go

The behavior of thiourea in the anodic process of copper electrorefining was investigated using various advanced electrochemical techniques with a view to establishing an accurate method to determine its effect on the anode process in certain highly concentrated copper sulfatesulfuric acid electrolytes. It was found that thiourea acted as an inhibitor hindering the anodic dissolution of copper ...

anode slime leaching with thiourea. Comprehensive recoveries of selenium copper gold silver . Anode slime is an insoluble byproduct produced during copper electrorefining Thus more attention has been paid to noncyanide processes among which thiourea leaching thiosulfate leaching and chloride leaching have been the most extensively investigated.

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, carried out ...

 · The thiourea leaching of gold and silver from the goldbearing silie 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 ...

Anode Slime Gained During Electrolysis Process of (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.

 · Recent studies dealt with various treatments of copper anode slime (CAS) recovering targeted elements. Among various methods used, the treatment by H2SO4O2 and thiourea was given by Amer [12]. Leaching processes of the CAS using H2SO4 and HNO3 as digestion agents were also applied [13,14]. A combined approach, thiosulfate leaching followed by ...

Silver and selenium were dissolved by leaching anode slime from which the copper had been removed with nitric acid. For gold extraction, anode slime was heated with aqua regia at 90°, and the gold then extracted with 2ethylhexanol at a concentration of M and phase ratio of 4. The extract was then stripped with soda solution at pH= and a phase ratio of 5. Finally, gold was recovered ...

pressure leaching of anode slimes. However, according to this study, sulfuric acid concentration was the parameter having the greatest impact. Furthermore, Weichert et al. [6] suggested that other parameters such as the sulfuric acid concentration, partial pressure of oxygen and other oxidizing agents had only a minor effect on extraction of copper. This was in contradiction with the results ...

 · applied to the recovery of gold from anode slimes, including sulfuric acid leaching, with or without pretreatment by alkali pressure oxidation,33,34 thiosulfate leaching,13 and leaching with ionic,36 In this paper, diethyl carbonate (DEC) is applied as an .

The changes were greater that the solution of thiourea H3PO4 is less harmful, since it in those cleaned with thioureaHCl solutions, but It must causes similar loss of copper as the thiourea HCl solution, be emphasised that both solutions caused the leaching and the formation of phosphates as identified by Barger and of copper from the silver alloy, to the point that it virtually White ...

ionic liquid (IL) to recover gold from copper anode slime (CAS). The optimum leaching conditions for maximizing gold recovery were determined by orthogonal array (OA) of Taguchi's experimental design method. OA L 16 (4 4) including four parameters with four levels each, was used to examine the effects of IL concentration (20%, 40%, 60%, 80% v/v), temperature (25, 50, 75, 95oC), time (½, 1 ...

 · The maximum lead leaching rate of unroasted manganese anode mud is only %, while the leaching rate of manganese anode mud increased to % under the same leaching time pretreated by 1123 K roasting. It is concluded that the hightemperature roasting significantly promotes the process of leaching lead in electrolytic manganese anode mud. This is mainly because the rapid .