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Article

Selective Recovery of Tellurium from the Tellurium-Bearing Sodium Carbonate Slag by Sodium Sulfide Leaching Followed by Cyclone Electrowinning

by 1,2,3, 1,2, 1,2, 1,2,*, 1,2, 1,2,* and 1,2
1
School of Metallurgy and Environment, Central South University, Changsha 410083, China
2
National & Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling, Changsha 410083, China
3
First Materials Co., Ltd., Qingyuan 511517, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(9), 1176; https://doi.org/10.3390/met10091176
Received: 27 July 2020 / Revised: 19 August 2020 / Accepted: 19 August 2020 / Published: 1 September 2020
The rigorous environmental requirements promote the development of new processes with short and clean technical routes for recycling tellurium from tellurium-bearing sodium carbonate slag. In this paper, a novel process for selective recovery of tellurium from the sodium carbonate slag by sodium sulfide leaching, followed by cyclone electrowinning, was proposed. 88% of tellurium was selectively extracted in 40 g/L Na2S solution at 50 °C for 60 min with a liquid to solid ratio of 8:1 mL/g, while antimony, lead and bismuth were enriched in the leaching residue. Tellurium in the leach liquor was efficiently electrodeposited by cyclone electrowinning without purification. The effects of current density, temperature and flow rate of the electrolyte on current efficiency, tellurium recovery, cell voltage, energy consumption, surface morphology, and crystallographic orientations were systematically investigated. 91.81% of current efficiency and 95.47% of tellurium recovery were achieved at current density of 80 A/m2, electrolyte temperature of 45 °C and electrolyte flow rate of 400 L/h. The energy consumption was as low as 1.81 kWh/kg. A total of 99.38% purity of compact tellurium deposits were obtained. Therefore, the proposed process may serve as a promising alternative for recovering tellurium from tellurium-bearing sodium carbonate slag. View Full-Text
Keywords: tellurium; sodium carbonate slag; sodium sulfide leaching; cyclone electrowinning; cathode morphology; crystal orientation tellurium; sodium carbonate slag; sodium sulfide leaching; cyclone electrowinning; cathode morphology; crystal orientation
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MDPI and ACS Style

Xu, Z.; Li, Z.; Li, D.; Guo, X.; Yang, Y.; Tian, Q.; Li, J. Selective Recovery of Tellurium from the Tellurium-Bearing Sodium Carbonate Slag by Sodium Sulfide Leaching Followed by Cyclone Electrowinning. Metals 2020, 10, 1176. https://doi.org/10.3390/met10091176

AMA Style

Xu Z, Li Z, Li D, Guo X, Yang Y, Tian Q, Li J. Selective Recovery of Tellurium from the Tellurium-Bearing Sodium Carbonate Slag by Sodium Sulfide Leaching Followed by Cyclone Electrowinning. Metals. 2020; 10(9):1176. https://doi.org/10.3390/met10091176

Chicago/Turabian Style

Xu, Zhipeng, Zoujiang Li, Dong Li, Xueyi Guo, Ying Yang, Qinghua Tian, and Jun Li. 2020. "Selective Recovery of Tellurium from the Tellurium-Bearing Sodium Carbonate Slag by Sodium Sulfide Leaching Followed by Cyclone Electrowinning" Metals 10, no. 9: 1176. https://doi.org/10.3390/met10091176

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