Enhanced selective recovery of selenium from anode slime using MnO2 in dilute H2SO4 solution as oxidant 1. Introduction. Selenium (Se) is an essential element …

Anode slime is a byproduct from copper or lead electro-refining process. The copper/lead anode slime usually contain As, Sb, Bi and precious metals like gold and silver. Smelter of anode slime is most likely divided into two groups by the two different recovery processes based on its property and treatment capacity, i.e. pyrometallurgy 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 ...

Decopperized anode slime leaching was carried out experimentally in a flask equipped with an agitator, a condenser, heating apparatus, and a temperature indicator and controller. 1500 g of decopperized anode slime containing 283.8 g of silver, 222.3 g of selenium, and 13.95 g of tellurium, together with a minimum amount of nitric acid, was ...

Anode slime is the insoluble product deposited at the bottom of the electrorefining tank during electrorefining of copper. ... 99.9% of selenium was removed from copper anode slime after ...

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 …

1. Introduction. China is the world's largest producer of refined copper, producing 10.1867 million tons in 2021. 1 Copper anode slime is an important byproduct produced in the copper electrolytic refining process, and its yield accounts for approximately 0.2–0.8% of refined copper production. 2 Copper anode slime is rich in Au, Ag, Se, Te, …

Omer and Recep (2000) studied the process for gold recovery from a complex anode slime containing copper, selenium, and tellurium, by roasting slime at 700°C for 4 h to remove selenium and ...

Na2CO3 is the enough dosage for 5 g anode slime. To examine the roasting temperature on selenium removal, 5 g anode slime was mixed with 0.5 g Na2CO3 Fig. 2 Effect of roasting time on selenium ...

During the pretreatment process, 99.9% of selenium was removed from copper anode slime after sulphation roasting, and the valuable metals of lead, copper and silver were concentrated as the lead-silver-copper multiphase complex by carbothermal reduction. The influence of temperature on the reduction efficiency was studied and the …

A novel process for selenium recovery from anode slime is proposed. • Se and Ag 2 Se are the major selenium components in anode slime. • MnO 2 is effective for the conversion of selenide to selenite. • The H 2 SO 4, temperature and stirring have great impact on selenium recovery.

In this research, selenium was selectively separated and recovered from copper anode slime by a hydrometallurgical-pyrometallurgy union process. In the first compound leaching process with H 2 SO 4, HCl and NaCl media, the pre-removal of As, Sb, and Bi was achieved, and the removal efficiencies were 85 %, 83 %, and 91 %, …

Copper anode slime is the main raw material for the extraction of rare and precious metals. However, the recovery of rare and precious metals still faces great challenges due to the variety of …

Approximately 90% of selenium and tellurium are obtained from anode slimes formed during the electrolytic refining of copper [1,5]. Copper anode slime is …

The selenium recovery rate can reach more than 97 %, but the applicability of raw materials is poor, and it is only suitable for high selenium and low tellurium copper anode slime. For the high arsenic, antimony and bismuth copper anode slime, arsenic will enter the flue gas and cause pollution, which requires higher equipment.

In this research, selenium was selectively separated and recovered from copper anode slime by a hydrometallurgical-pyrometallurgy union process. In the first compound leaching process with H 2 SO 4, HCl and NaCl media, the pre-removal of As, Sb, and Bi was achieved, and the removal efficiencies were 85 %, 83 %, and 91 %, …

As an important rare metal, selenium has been widely used in the fields of electronics, metallurgy, the chemical industry, biology, and medicine [1, 2].Crude selenium extracted from copper anode slime by hydrometallurgical methods contains many impurities and precious metals, such as gold and silver, and cannot meet the requirements of …

In this research, selenium was selectively separated and recovered from copper anode slime by a hydrometallurgical-pyrometallurgy union process. In the first compound leaching process with H 2 SO 4, HCl and NaCl media, the pre-removal of As, Sb, and Bi was achieved, and the removal efficiencies were 85 %, 83 %, and 91 %, …

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 …

There are numerous approaches to the treatment of both copper and lead anode slimes. Although the chemistry and metallurgy has been described and discussed by many authors, few, if any, have described the environmental impact of these activities. Dust and especially selenium emissions are a problem both in the internal working environment as well as in …

In this regard, the copper anode slime was roasted with sodium carbonate at 1023 K (750 °C) for two hours, and then the roasted product was leached with water at 363 K (90 °C) for selenium separation . The Se-removed slime was dried before leaching with a 100 g /L sulfuric acid solution to separate Cu from the anode slime . Finally, the leach ...

To extract selenium(VI) from the highly caustic leachate of copper anode slime, the Ca–Al–Cl layered double hydroxides (Ca–Al–Cl–LDHs) with a formula of Ca2Al(OH)6Cl·2H2O by three co ...

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 …

Copper anode slime contains significant amounts of gold, silver, and platinum group metals. In this study, we tested the functionality of a slime shaking table for recovering precious metal components by recycling barite particles from the copper anode slime. ... Leaching kinetics of selenium from copper anode slimes by nitric acid-sulfuric ...

Based on the Eh–pH diagram for the Se–H2O system, a new method is proposed for leaching selenium from copper anode slimes using a nitric acid–sulfuric …

Abstract. In this research, selenium was selectively separated and recovered from copper anode slime by a hydrometallurgical-pyrometallurgy union process. In the …

1. Roasting. Copper anode slimes are roasted at 600–800°C with sulfuric acid or oxygen, which depends on the composition of slimes. During the process, selenium is evaporated in the form of SeO 2 gas. Copper is present in the form of soluble copper sulfate, which can be removed with dilute acid or water leaching.

anode slime is the initial de-copperization of the slime by sulphuric acid leaching in the presence of air/oxygen at atmospheric/elevated pressure conditions. During ... removing selenium from the slime, the deselenized slime, which is still complex, is further treated for the recovery of precious metals from the slime. The precious

Scrap Cu anode slime was provided by a recycled Cu smelting enterprise located in Qingyuan city, Guangdong province. Prior to leaching, the material was pretreated by drying, grinding, and sieving to obtain the desired particle size (<100 μm). ... The leaching kinetics of selenium from copper anode slimes was studied in a nitric acid-sulfuric ...

The invention discloses a method for recovering selenium from copper anode slime. The method is characterized by comprising the following process steps of: adding copper powder into the copper anode slime, pulpifying with concentrated sulfuric acid, then sending into a rotary kiln for roasting, and generating sulfur dioxide gas from the copper powder during …