A clean hydrometallurgical process has been developed to efficiently and economically recover selenium, copper, gold, silver and lead from a copper anode slime. The mixture of H 2 SO 4 and H 2 O 2 was demonstrated to be effective for selenium leaching based on their synergistic effects, and the potential synergy mechanism was …

Refining of silver and gold as products from gold mining or the smelting of copper anode slime, is often the final process of these metal production processes (Shi and Ye, 2013; Bard and Sobral ...

There are numerous viable approaches to the treatment of anode slimes from electrolytic copper refining. Of particular interest in the treatment of slimes are the behavior and recovery of selenium. The understanding of the process chemistry involved in the treatment of anode slimes should be aided considerably by recent work on the formation …

Anode slime is the insoluble product deposited at the bottom of the electrorefining tank during electrorefining of copper. It generally contains Cu, Ni, Se, Te, Ag, Au, platinum group metals (PGM), Pb, Ba, Fe, etc. Owing to the presence of valuable metals and metalloids in the anode slime, numerous approaches have been made by the …

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 …

Combining conventional electrochemical measurements, laser-based visualization and digital image processing, the movement of anode slime, its spatial distribution and path of falling during the copper electrorefining process were investigated in a laboratory scale cell. Two types of anode slime, small agglomerates and fine particles were observed.

A hydrometallurgical process is provided for the recovery of tellurium as elemental tellurium powder from copper refinery anode slime containing high amount of lead. The process involves the removal of copper and lead from anode slime followed by the recovery of tellurium as elemental powders.

Copper electro-refining (Cu-ER) is the principal method for producing >70% of high or 99.97% pure copper cathodes from 97-99% pure blister/fire refined-scrap copper anodes. While the inert and most of less soluble impurities settle as anode slime/sludge, other soluble impurities, particularly the metalloids (group VA/15 elements or Q: As, Sb …

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…

The leaching behavior of metals from copper anode slime was investigated using an alkali fusion-leaching process for the preliminary separation of metal values. The slime was fused with sodium hydroxide (NaOH) and sodium nitrate (NaNO 3) followed by water leaching.

Three types of secondary copper anodes are electro refined in an electrolytic system, where the electrolyte is an acid of copper sulphate solution. As a result of the electro-refining process the ...

The behaviour of copper anodes with different content of arsenic were studied at high current density (>280 a/m 2 ). it showed that low arsenic anodes (as < 300 ppm) easily generated anode passivation, floating slimes and cathode nodules during the electrorefining proccess.

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 …

The nodular growth process with the inclusion of impurity particles in copper electrorefining was investigated by experimental analyses of impurity contents inside the nodules and numerical simulations using the tertiary current distribution.

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 ...

This report discusses Electrorefining Copper research conducted to increase the rate, deposit purity, and overall efficiency in industrial processes used to electrodeposit and purify metals by increasing substantially the operating current density range and optimizing the deposition process. Traditionally, copper refineries operate …

The anode slime obtained from the copper electrorefining tank contains several valuable elements. The physico-chemical characteristics of the anode slime determines the processing route to recover these elements.

The settling velocities of slime particles and local upward flow velocities can be affected by inlet flow rate, temperature, and current density. 6, 7 The composition of anodes and the cell temperature have significant effects on the sizes of slime particles by affecting slime particle sintering and coalescence during copper electrorefining. 5 ...

Experimental results demonstrate that slime particle sintering and coalescence can improve anode slime adhesion and reduce the amount of suspended slimes, which are a major source of copper ...

It was modeled in COMSOL Multiphysics to simulate copper electrorefining process. Unlike conventional electrorefining cells, downward electrolyte flows are more dominant in the fluid flow field in this cell, which leads to faster settlement of slime particles and less contamination to the cathode.

The composition of copper anode slime heavily depends on the raw input materials, extraction method, concentration of impurities in the anodes, and the electrorefining conditions.

Copper anode slimes are precipitated at the bottom of copper electrorefining cells during copper electrolytic refining. 1, 2 Besides containing precious metals such as silver and gold, the slimes …

Our anode slime treatment plant consists of slime collection, leaching, and dewatering using Outotec OKTOP leaching reactors and Outotec Larox slime filters. Decopperized anode slimes can be processed further in our precious metals plant, in either a pure hydrometallurgical or a combined pyro/ hydrometallurgical process.

The most effective hydrometallurgical processing of anode slime is based on a chlorination route. However, it requires special attention with respect to pollution problems and construction materials. To minimize the problems, a new hydrometallurgical approach was pursued for the recovery of valuable metals and metalloids from copper …

The production in the anode compartment of a gold-bearing slime, which can cause passivation of the silver anodes, must be periodically removed, creating materials-handling challenges. The anode compartment must be isolated from the cathode compartment by a membrane or porous bag to avoid contaminating the silver crystals with anode slime.

Anode slimes contain a significant amount of precious metals, therefore, their processing has a substantial economic impact on plant profitability. The first step of the anode slime treatment process is decoppering, in which copper is typically removed from slimes by oxidative pressurized acid leaching [1-3].

The settling properties of anode slime in copper electrorefining have crucial effect on copper cathode quality. Anode slime settling is affected by electrolyte composition and temperature, electrolyte circulation, and the sizes and density of …

Copper anode slimes, which form during the electrorefining process of pyrometallurgical copper production, are considered as valuable industrial wastes due to their chemical composition (Dong et ...

Copper anode slime produced by electrorefining copper has a high recovery value due to the valuable metals and platinum group metals present. Neither traditional cupellation processes nor…

Saganoseki Smelter and Refinery of Pan Pacific Copper Co., Ltd. started treating copper anode slimes using a unique hydrometallurgical process in chloride media in 1997. The process comprises the following stages, decopperizing, wet chlorination, solvent extraction for gold, silver chloride reduction, and separate reduction stages that treat the gold …