Leaching of constituent metals from copper anode slime/CAS (22.23% Se, 1.53% Te, 9.66% Ag) by sulfuric acid in the presence of manganese(IV) oxide (MnO 2) and graphite has been investigated at a range conditions by varying stirring speed (200–600 rpm), H 2 SO 4 concentration (0.5–3.0 M), MnO2/CAS and graphite/CAS mass ratio (0–1/1) and temperature (25–90 °C).

Anode mud or slime from copper electrolysis, though a byproduct of copper industry, contains many important metals like nickel, copper, selenium, tellurium and noble metals, the recovery of which not only makes copper production economical but also gives important metals. The importance of selenium and tellurium in the modern technological world has attracted the attention of scientists and ...

Anode slime, a byproduct from the process of copper electrorefining into the copper cathode, contains several valuable elements that can be extracted after Cu and Pb separations. Another alternative route for extracting the precious metals is still needed in terms of gaining more economical route.

Selenium is obtained mainly as a byproduct of other metals, and is produced primarily from the anode mud of copper refineries. This paper presents a comprehensive review of selenium minerals, as well as the treatment of copper refinery anode slimes for the recovery of selenium.

Sulfuric acid leaching of copper anode slime (CAS) in the presence of manganese(IV) oxide (MnO2) and graphite was investigated for Se, Te and Ag recovery. The study reveals that the leaching of Se, Te and Ag was facilitated by the galvanic interaction with MnO2, and graphite played the role of a catalyst. The leaching process could yield 81.9% Se, 90.8% Te, and 80.7% Ag leaching efficiency ...

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, selenium and tellurium are dissolved, whereas gold and other impurities remain in the residue. Silver in the leach

In this study, the anode slime was dissolved in hydrochloric acidto produce silver chloride that could be separated from other metals. Wang et al. (1981) were recovered precious metals such as gold, silver, selenium, tellurium etc. from anode slime by the hydrometallurgical process. It is mentioned that to anode slime should be first

A simple and sensitive combined solvent-extraction and atomic-absorption spectrometric method has been developed for the determination of gold in silver, copper, lead, selenium and anode slime. Samples are decomposed with hydrochloric and nitric acids, and gold is extracted as the trioctylmethylammo …

Thermogravimetric studies were made on thin layers and spherical pellets of decopperized anode slimes. These have shown that deselenization proceeds initially by the volatilization of the free selenium content at about 360°C. At higher temperatures and under an oxidizing atmosphere, silver selenide is decomposed either directly or via the formation of silver selenite and its subsequent ...

Copper anode slime (CAS) is a solid byproduct of copper electrorefining process, from which the recoveries of base metals (copper, nickel), high-value rare elements (tellurium, selenium) and ...

Selenium-containing Materials Selenium containing materials: copper anode slime, lead anode slime and nickel anode slime; wastes from the production process of CIGS batteries; wastes from the production process of ZnSe materials; selenium-containing sulfur-based glass wastes; end-of-life devices with selenium.

High-value-added hazardous selenium sludge extracted from copper anode slime may cause serious selenium contamination and potential threats to human health if improperly treated. In this study, a sustainable chemical reaction-free vacuum separation process was used to extract selenium and recycle valuable metals from selenium sludge. The process comprises low-pressure dehydration and Se ...

The selenium roasting of anode slimes is a complex process where the deselenisation rate is linked with the chemical form of selenium present in the slime. Elemental selenium is removed from the ...

The main components of the anode slime (CuAgSe, Cu 2-x Se y S 1-y, Ag 3 AuSe 2) 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 (SeO 2) is volatilized and recovered in pure state by cooling the gaseous phase, whilst copper(II) ...

hi everybody.. i have read most of the topics in forum for 2 years but this is my first message.. i love recycling, especially precious metal winning. also i work in electrolithic copper plant. we produce lots of anode slimes every month that include ~2 kg/ton Au and ~4.5 kg/ton Ag, %25-40 Cu (Pb,Sn sulphates) Te,Se most of copper silver and gold in telluride and sellenide form.

Copper anode slimes are a by-product of the electrolytic refining of anode copper, which contains significant amounts of silver, selenium, copper, and gold. Slimes are usually smelted to recover silver and gold. The thermodynamics of the smelting of such selenium-rich materials have received only little attention. In this work, the numerical values on the standard thermodynamic functions of Ag ...

Keywords: leaching, floatation, selenium, tellurium, copper. Introduction During the electrorefining of copper anodes, the insoluble components, anode slimes, settle to the bottom of the electrolytic cells. Anode slimes almost invariably contain copper, tellurium, selenium, silver, gold and traces of platinum group metals. In order to recover the

Most of the selenium in use today originates from the anode slime generated during the electrolytic refining of copper. ... which is the primary method used …

A hydrometallurgical process for recovering precious metals, such as gold, silver, selenium, and tellurium etc. from anode slime has been developed and tested successfully. The process comprises three major unit operations: leaching, liquid-liquid extraction, and reduction. The decopperized anode slime is first leached with nitric acid at an elevated temperature to obtain a leach solution ...

It stays in the non-copper anode slime. After the process of removing copper and obtaining non-copper anode slime, there comes the second phase of anode slime refinement, which is the phase of removing selenium i.e. the roasting phase by sulphate acid, which products are non-selenium anode slime i.e. roasted material and selenium as a by-product.

ABSTRACT OF THE DISCLOSURE A hydrometallurgical process for the recovery of silver, selenium and tellurium from the anode slime produced in the electrolytic refining of copper or lead or from other raw materials bearing these metals, wherein the raw material and concentrated sulfuric acid or oleum are heated at approx. 160-300°C, preferably 160-200°C, in order to sulfate the nickel and the ...

An alternative method to recover copper and selenium from anode slime was designed. • The critical process parameters were investigated and optimized. • 2 L/min flow rate of oxygen was enough to achieve the maximum dissolution rates. • The maximum recovery of copper and selenium was found as 94% and 86%, respectively. •

12%Tellurium is recognized as one of the critical elements[9,10,11,12] with an approximate production rate of 480 tons per year (2019), and about 90 pct of it comes from copper anode slime.[2,7] Major components of copper anode slime are copper, sulfur, silver, selenium, arsenic, lead, gold, nickel, antimony, and tellurium.Apart from copper anode slime, tellurium is also …

Hindustan Copper Limited (HCL), a public sector undertaking under the administrative control of the Ministry of Mines, was incorporated on 9th November 1967. It has the distinction of being the nation's only vertically integrated copper producing company as it manufactures copper right from the stage of mining to beneficiation, smelting, refining and casting of refined copper metal into ...

The recovery of selenium from Iranian sar-cheshmeh copper anode slime has been investigated. Copper anode slimes are containing varying precious metals, such as: gold, silver, selenium and tellurium. They are being extracted as a by-product in the production process. Arsenic and antimony that present in anode slimes dissolved in 0.4 M KOH.

mineralogical analysis of the copper anode slime. The XRD and XRF equipment models were Phillips and ARL 8410, respectively. 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

In this study, metallurgical grade crude selenium (99.4%), comprehensively recovered from copper electrolysis anode slime, was purified to 99.992% through triple consecutive vacuum distillation (TCVD) on a laboratory scale. The actual evaporation rate and accommodation coefficient α of crude selenium were found to be 0.0231 g cm−2 min and 0.3236, respectively, at 523 K and approximately 4 ...

Anode slimes are collected from the bottom of the electrolytic cells during the refining of copper. There are two different kinds of slimes depending on the sources from which they are obtained. The first one produced during the processing of copper concentrate which exhibits a relatively high gold, silver, tellurium and selenium

content of anode slime. The main phases in the anode slime were copper and lead sulphates as well as copper-silver selenides. NiO was shown to be the major Ni-bearing phase in the adherent slime. Nickel, tellurium and lead had the strongest, whereas arsenic, selenium and antimony had the weakest tendency to report to the anode slime.

12%A method for leaching selenium from copper anode slimes is proposed using a nitric acid–sulfuric acid mixture. 1. The optimum conditions for selenium leaching are a solid/liquid ratio of 0.25 g/ml, HNO 3 concentration of 0.5 M, H 2 SO 4 concentration of 2 M, leaching temperature of 363 K, and a reaction time of 3 h.

Copper anode slime (CAS) is a solid byproduct of copper electrorefining process, from which the recoveries of base metals (copper, nickel), high-value rare elements (tellurium, selenium) and ...

Whereas the lead anode slime is firstly treated with chloride leaching and then the leaching residue can be mixed with de-selenium and de-coppered copper anode slime for further recovery. The chloride leaching solution of lead anode slime is used to recover Cu/ Bi/Sb separately. As a conclusion, it is widely acknowledged that the anode slime is ...

Optimization on selenium and arsenic conversion from copper anode slime by low-temperature alkali fusion process GUO Xue-yi()1, 2, XU Zhi-peng()1, TIAN Qing-hua( )1, 2, LI Dong()1, 2 1. School of Metallurgy and Environment, …

93.6% of selenium in the anode slime was dissolved by H 2 SO 4 leaching assisted with H 2 O 2, and then 99.3% of the dissolved selenium was reduced by Na 2 SO 3. Thus, 92.9% of selenium in the slime went into the simple substance selenium product. The rest of the selenium in the residue was mainly leached into the pregnant solution of chloride ...