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Metals 2018, 8(7), 542;

Extraction of Metal Arsenic from Waste Sodium Arsenate by Roasting with Charcoal Powder

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Received: 25 June 2018 / Revised: 7 July 2018 / Accepted: 11 July 2018 / Published: 13 July 2018
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The current paper explored the directly reductive decomposition of waste sodium arsenate by roasting it with charcoal powder to volatilize less toxic As0 and to simultaneously obtain sodium salts with potential commercial value, serving the purpose of developing a more sustainable route to deal with the environmental issues faced by the antimony production industry in China. The process was firstly evaluated by thermogravimetric (TG) analysis and thermochemical calculations. The effects of N2 flow rate, roasting temperature, dosage of charcoal powder, and roasting time were then investigated. The results showed that the arsenic extraction could reach 99.84% under optimal conditions. The roasting residue, containing arsenic as low as 0.0598%, was a promising source for the production of Na2CO3 as expected. In addition, X-ray diffraction (XRD), scanning electron micrograph (SEM), and X-ray photoelectron spectroscopy (XPS) were conducted to reveal the roasting mechanism and formation of metal arsenic was thereby confirmed. View Full-Text
Keywords: arsenic; arsenic removal; arsenate; metal arsenic; reductive roasting arsenic; arsenic removal; arsenate; metal arsenic; reductive roasting

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Yang, K.; Qin, W.; Liu, W. Extraction of Metal Arsenic from Waste Sodium Arsenate by Roasting with Charcoal Powder. Metals 2018, 8, 542.

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