Harmless Treatment of High Arsenic Tin Tailings and Environmental Durability Assessment

Weiwei Zhao, Zhengfu Zhang (), Hui Yang, Xian Zhou, Jinsong Wang and Chengping Li
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Weiwei Zhao: Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Zhengfu Zhang: Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Hui Yang: Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Xian Zhou: Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jinsong Wang: Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Chengping Li: Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

IJERPH, 2022, vol. 19, issue 18, 1-14

Abstract: The treatment of arsenic (As) in tin tailings (TT) has been an urgent environmental problem, and stabilization/solidification (S/S) treatment is considered an effective technology to eliminate contamination of As. In this study, we developed a low-carbon and low-alkalinity material to S/S of As, and the results showed that the leaching concentration of As after treatment was lower than the Chinese soil environmental quality standard (0.1 mg/L). Based on a series of characterization tests, we found that OH − promoted the dissolution of As(III)-S, Fe-As(V), and amorphous As(III)-O species and formed Ca-As(III) and Ca-(V) species with Ca 2+ . Simultaneously, hydration produces calcium silicate hydrate (C-S-H) gel and ettringite by the form of adsorption and ion exchange to achieve S/S of As. We also assessed the durability of this material to acidity and temperature, and showed that the leaching concentration of As was below 0.1 mg/L at pH = 1–5 and temperature 20–60 °C. The method proposed in this study, S/S of As, has excellent effect and environmental durability, providing a new solution for harmless treatment of TT and its practical application.

Keywords: arsenic; environmental durability; mechanism of stabilization/solidification; tin tailings (TT) (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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