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Published on: February 21, 2017
Investigation into the semi-dynamic leaching characteristics of arsenic and antimony from solidified/stabilized
Wei Gao1, Wen Ni2, Yuying Zhang2
1School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing, 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China.
Abstract:
The leaching characteristics of metallurgical slag-based binders (MSB) solidified/stabilized tailings containing arsenic (As) and antimony (Sb), were investigated via a series of semi-dynamic leaching tests using three kinds of leachant, for the simulation of actual leaching conditions. The effectiveness of solidification/stabilization (S/S) treatment was evaluated by measuring the observed diffusion coefficients (Dobs). It was found that MSB efficiently prevented As and Sb leaching, providing Dobs values in the range of 10-15 to 10-13 cm2/s and 10-11 to 10-9 cm2/s, respectively, with the exception that the leaching mechanism of As was dissolution rather than diffusion under acetic acid leaching conditions. Physical encapsulation was found to be the dominant mechanism for Sb immobilization, while the dominant mechanism of As immobilization was precipitation in the monolithic MSB S/S treated tailings (MST). Results showed that the concentrations of leached As, Sb, Ca and Si, were affected by leachant pH and total acidity as well as the MSB constituent ratio. The effect of these parameters may be attributed to the stability of hydration products and their influence on the buffering capacity and structure of matrices, and the leachant pH and total acidity having the greatest influence on leaching characteristics.
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