Selenium and tellurium are generally present in slimes as intermetallic compounds of silver, copper, and occasionally gold (e.g., Ag2 Se, CU2 Te and (Ag,Au)Te 2 ). A variety of processes are employed for the extraction of selenium and tellurium from slimes, as well as their separation from each other.
Jul 01, 1989· The significant amount of selenium and tellurium present in copper refinery slimes often makes the recovery of these elements not only desirable, but economically viable. While a variety of processes have been developed to this end, some are more feasible because they recover greater values and are environmentally safer.
tellurium was recovered from scrapped selenium-tellurium photoreceptors employed in older plain-paper copiers in Europe. A plant in the United States recycled tellurium from CdTe solar cells; however, the amount recycled was recovering tellurium from copper anode slimes and from residues generated during the lead, nickel, precious metals
slimes. most of the selenium and tellurium contained in domestic anode slimes came from copper ores mined in Arizona and utah. domestic production of selenium and tellurium decreased in 2016, with production of refined selenium coming to a halt and production of tellurium decreasing by 3%.
This is probably because selenium and tellurium tend to disperse into different process products and thus are difficult to recover. According to the properties of selenium and tellurium, soda roastingÃacid leaching process is a cost-effective approach for recovering selenium and tellurium from anode slimes.
selenium and tellurium (90% selenium) for toll-reﬁ ning in Asia. Two other reﬁ neries generated selenium- and tellurium-containing slimes that were exported for processing. Most of the selenium and tellurium contained in domestic anodes and slimes came from copper ores in Arizona and Utah. One reﬁ nery processed anodes imports from Canada.
selenium slimes process sludges tellurium Prior art date 1934-02-17 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Lifetime Application number US711622A Inventor Oliver C Martin Charles W
The present invention is concerned with a method for the substantially selective extraction of tellurium from copper electrorefining slimes. The method comprises maintaining a molar ratio Ag/Se, Ag/S or Ag/Se+S at a value of about 2 or less in the slimes during leaching thereof in an autoclave. The excess of selenium and/or sulphur allows the formation of Ag 2 Se or Ag 2 S, which remains
Abstract A process using soda roasting–alkaline leaching–acid leaching to remove selenium, tellurium and copper sequentially from the copper anode slime with high content of Ni was tested. The mechanism of this process was outlined based on thermodynamic analysis and the change in the XRD patterns of different intermediate products. During soda roasting, copper which occurs as Cu 4 SeTe in
Abstract Anode slimes obtained from the electrolytic refining of copper contain selenium and tellurium in the form of selenides and tellurides of metals, e.g., copper and silver. The slimes were treated with sulfur under vacuum; selenides and tellurides decomposed to give selenium and tellurium in metallic form which condensed on a cooler zone.
Process of separating the selenium content from the tellurium content of sludges or slimes, which comprises roasting the sludges or slimes while rabbling the same and applying a sulphatizing material to the surfaces of the sludges or slimes as exposed by such rabbling, said roasting being conducted at a temperature of approximately 7000 F. or a
SELENIUM AND TELLURIUM 14 Selenium and Tellurium Selenium and tellurium metals are recovered as by-products during copper, lead-zinc, gold and platinum ore processing. The principal sources of selenium are sulphide deposits and anode mud or slime obtained during electrolytic refining of copper. Tellurium is found mostly in
16.3.9 Tellurium. Tellurium is similar to selenium in terms of its toxicity, as Te IV is 10 times more toxic than Te VI.  Tellurium is commonly used in electronics, metallurgy, and pharmaceuticals . Little research has been presented using HPLC-ICP-MS to separate both species simultaneously.
The significant amount of selenium and tellurium present in copper refinery slimes often makes the recovery of these elements not only desirable, but economically viable. While a variety of processes have been developed to this end, some are more feasible because they recover greater values and are environmentally safer.
tellurium, selenium, silver, gold and traces of platinum group metals. In order to recover the precious metals from slimes, refineries must first complete the separation of copper, tellurium and selenium prior to refining silver and gold to pure products. Phelps Dodge Refining Corporation El Paso, (Figure 1), employs autoclaving for copper
Tellurium is a relatively rare element, in the same stone family as oxygen, sulfur, selenium, and polonium: oxygen and sulfur are nonmetals, polonium is a metal, and selenium and tellurium are semiconductors (i.e., their electrical properties are between those of a metal and an insulator).
SELENIUM PRODUCTION AND CONSUMPTION. In 2013, there was one U.S. producer of refined selenium. Another U.S. copper refinery produced and exported semirefined material containing 90 percent selenium for refining in Asia, and one U.S. refinery generated selenium- and tellurium-containing slimes that were exported for processing.
Selenium is a stone element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust.
Aug 17, 1999· As a result, it is difficult to selectively leach tellurium from the slimes. It has been found that the ratio silver/selenium or silver/sulphur or silver/sulphur+selenium is the most important factor influencing the tellurium extraction by conventional autoclave leaching.
Selenium is found in 75 different mineral species, however, pure selenium does not exist as an ore. For this reason, primary selenium is recovered from anode slimes generated in the electrolytic refining of copper. One facility, ASARCO Amarillo, TX, processes this slime further to recover tellurium. For more information on tellurium recovery,
Selenium is mostly extracted from copper anode slimes because the selenium-rich ores are too rare to be mined with profit. When copper anode slimes are processed in a precious metal plant the first step is to remove copper by pressure leach in an autoclave. The anode slime
SELENIUM AND TELLURIUM 14 Selenium and Tellurium S elenium and tellurium metals are recovered as by-products during copper, lead-zinc, gold and platinum ore processing. The principal sources of selenium are sulphide deposits and anode mud or slime obtained during electrolytic refining of copper. Tellurium is found mostly in
A relatively rare element, tellurium is tied with platinum and palladium as the 71st most abundant element in Earth’s crust. Tellurium belongs to the chalcogen stone family, along with oxygen, sulfur, selenium and polonium. Oxygen and sulfur are nonmetals, polonium is a metal, and selenium and tellurium are metalloids. However, selenium and tellurium are often referred to as metals when
Slimes and sludges, copper electrolytic are defined as : A complex combination of insoluble compounds produced by precipitation during the copper electrolytic refining or winning processes. It consists typically of various metals (such as precious metals, copper, antimony, tin, selenium, tellurium, arsenic, lead and nickel), as well as their
Selenium (Se), a stone element in the oxygen group (Group 16 [VIa] of the periodic table), closely allied in stone and physical properties with the elements sulfur and tellurium. Selenium is rare, composing approximately 90 parts per billion of the crust of Earth. It is occasionally found
Crystalline tellurium is a silvery metal with a typical metallic lustre. It is brittle and easily pulverised with only a hardness of 2.3 on Mohs’ scale. Amorphous tellurium is obtained by precipitation from solutions of tellurous acid H2TeO3 or telluric acid H2TeO4. Tellurium burns in
from domestic copper anode slimes. The primary producer and downstream producers further refined domestic and imported commercial-grade metal to produce tellurium dioxide, high-purity tellurium, and tellurium compounds for specialty applications. To avoid disclosing company proprietary data, U.S. tellurium production in 2018 was withheld.
The author employs decopperised slimes to extract silver, 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
scandium titanium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon World map showing locations of selected tellurium-enriched mineral