selenium tellurium separation

The separation of selenium from tellurium in hydrochloric acid media by solvent extraction with tri-butyl phosphate has been studied. Extensive laboratory experiments have been carried out at bench scale and pilot scale with different extraction apparatus. Results indicate that under the experimental conditions a high degree of …

To separate and purify Te, Bi, Se, and Sb from bismuth telluride waste, this study investigates oxidative leaching with NaClO 3, selenium reduction with …

Selenium is present in the copper anode slimes along with various elements such as tellurium (Te). In the periodic table, Se is located above Te; therefore, it shares chemical properties with this element. Selenium's proximity to tellurium leads to significant separation problems when these two elements are present together in a solution.

Selenium and Tellurium Separation: Copper Cementation Evaluation Using Response Surface Methodology. October 2022. Metals 12 (11) DOI: 10.3390/met12111851. License. CC BY 4.0. Authors: Nima...

After separation of selenium, copper and silver were taken apart by solvent extraction using CP-150. Using 10% (V/V) CP-150 in kerosene, a 5 min contact time, pH of 4 and organic to aqueous ratio ...

Red or black deposits were confirmed as elemental selenium and tellurium, respectively. Selenium oxide and tellurium oxide were also found after growth of Trichoderma harzianum with 1 mM selenite ...

The separation rate of selenium and tellurium is 99.94 % and the volatilized rate is 90.75 %. •. This method provides valuable theoretical and practical guidance for …

The detection limits (3σ) are 7 ng L−1 selenium and 3 ng L−1 tellurium. Factors affecting the separation and detection were investigated. Coexisting ions did not show significant interferences. This method has been successfully applied to the inorganic selenium and tellurium speciation analysis of water samples with spiked recoveries of …

It is a general challenge to separate similar elements in material and non-ferrous metallurgical industries. Due to their unique semiconductor properties, selenium and tellurium as well as their separation have been increasingly drawing the attention of worldwide research. Currently, they are mainly extracted and recycled from copper …

The removal of Te and Cu was the key point during the selenium purification process. Experimental results found that the volatile decomposition and volatilization behavior of Cu–Se compounds and Te would result in a high content of Cu and Te in selenium. Based on Eh-pH of the Se–Te–Cu–H2O system, a removal route of …

The +2 state for both selenium and tellurium is not known to occur in nature. In terms of chemical properties, selenium reacts with active metals and gains electrons to form …

In this process, selenium, tellurium and copper can be first sequentially separated from copper anode slime and then the residue can be sent to recover precious metals through either pyrometallurgy or hydrometallurgy processes. 4 Conclusions 1) The optimal roastingíalkaline leaching conditions are as follows: Na 2 CO 3 dosage is 10% …

The equilibrium phase diagram [15] could explain that major impurities, except for selenium, do not form a solid solution with matrix material(Te), and the equilibrium distribution coefficient k of all impurities is well below unity as shown in Fig. 1.Therefore, impurities such as bismuth, antimony, tin, and selenium tend to remain …

In this study, continuous vacuum separation and discontinuous vacuum separation processes were developed for high-antimony crude tin (HACT). During the industrial treatment of 60 t of HACT, product I of crude Sn and Sn–Sb alloy I were obtained by continuous vacuum separation at a temperature of 1473 K and pressure of 20–100 Pa.

Selenium (Se, atomic number 34, atomic weight 78.96) lies between arsenic and bromine and between sulfur and tellurium (Te, atomic number 52, atomic weight 127.61) in Group 6A (chalcogens) in the periodic table. It was discovered in 1817 by a Swedish chemist as a contaminant in sulfuric acid. Its name was derived from the Greek selene, meaning ...

Selenium and Tellurium Separation: Copper Cementation Evaluation Using Response Surface Methodology. S. Hosseinipour, E. Keshavarz Alamdari, N. …

To minimize tellurium loss during reduction and facilitate tellurium–selenium separation, this study employed hydroxylamine hydrochloride for the selective reduction of tetravalent selenium. In the first step, hydroxylamine hydrochloride was added to the solution in an excess amount of 5 times the selenium content, ...

Furthermore, using multistage BLM leads to an increase in the selectivity of tellurium than selenium and Copper up to 2549 and 4530.6, respectively, after using only four separation stages. View ...

It is a general challenge to separate similar elements in material and non-ferrous metallurgical industries. Due to their unique semiconductor properties, selenium and tellurium as well as their separation have been increasingly drawing the attention of worldwide research. Currently, they are mainly extracted and recycled from copper …

Selenium (Se, atomic number 34, atomic weight 78.96) lies between arsenic and bromine and between sulfur and tellurium (Te, atomic number 52, atomic weight 127.61) in Group 6A (chalcogens) in the periodic table. It was discovered in 1817 by a Swedish chemist as a contaminant in sulfuric acid. Its name was derived from the Greek …

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.

THE SEPARATION OF SELENIUM AND TELLURIUM. V. Lenher, C. Kao. Published 1 October 1925. Chemistry. Journal of the American Chemical Society. View via Publisher. Save to Library. Create Alert. Cite.

1. Introduction. Selenium (Se) is a strategic rare metal and a necessary trace element for humans due to its scarcity in the earth and its excellent properties, respectively [1], [2], [3]; thus, Se has been increasingly studied as a promising candidate material for future optoelectronic applications [4].The European Commission has identified selenium …

1. Introduction. Selenium (Se) is an essential element in human body, which can effectively reduce the risk of heart disease and cancer. While, excessive selenium intake (more than 500 μg of Se per day) can lead to poisoning, alopecia and/or demeanor [1].Se IV and Se VI are the main existing forms of selenium in natural waters [2].Solid …

In contrast, sulfur, selenium, tellurium, antimony, bismuth and lead have a saturated vapor pressure that is two to seven orders of magnitude larger than that of silver, and they can evaporate into the gas phase and then cool on different-grade condensers. ... High-efficiency separation was achieved for the base metals lead, antimony, and ...

that their separation is a matter of less concern. The dissolution behavior of these elements is different enough from tellurium that they can be easily sepa-rated.[27,30] The dissolution behavior of these elements is discussed later in this section. Tellurium and selenium belong to the chalcogen group (Group VI of the periodic table). All the

The separation efficiency of selenium and tellurium increased from 97.09 % to 99.94 % when the hydrogen peroxide addition increased from 0.5 to 1.1 L/kg, with increasing the amount of hydrogen peroxide, the removal rate of tellurium tends to be …

The separation of tellurium and selenium can be achieved by oxidation and conversion of Te and Se to their hexavalent valence forms. Se(VI) as the form of sodium selenate is soluble in alkaline solution, while insoluble Te(VI) as the form of sodium tellurate remains in the leach residue, so Se and Te can be effectively separated. ...

A new method was developed for the simultaneous determination of inorganic tellurium and selenium species in waters by inductively coupled plasma mass spectrometry (ICP-MS) following selective solid-phase extraction (SPE) separation.Under acidic conditions, only selenium(IV) and tellurium(IV) formed complexes with ammonium …