Study on Mechanism of Desulfurization by Spent Zn-MnO₂ Batteries

Abstract:

The mechanism of a novel desulfurization method using spent Zn-MnO₂ batteries has been studied by X-ray diffraction(XRD), scanning electronic microscopy (SEM), energy dispersive spectrometry (EDS) and the experiments of SO₂ absorption. The XRD results show that the positive electrode of spent Zn-MnO₂ batteries consists of a mixture of α-MnO₂, Mn₂O₃ and Mn₃O₄ phase. The SEM results show that micropores and microparticles are observed in the positive electrode surface, the relative content of zinc and graphite increases in the positive electrode after discharging according to EDS. The results of absorption experiments show that the electrolyte of spent batteries is of weak alkali which verifies the feasibility of absorbing SO₂ using spent Zn-MnO₂ batteries. Furthermore, the solution obtained by washing the positive electrode with low concentration ammonia is of much better desulfurization efficiency than that with distilled water directly, and 40°C is the optimum to absorb SO₂ at a range of 30-70°C.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 452-456
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.452
• Online since: November 2011
• Authors: Da Hui Wang, Sha Zhang, Ji Hong Xia
• Keywords: Desulfurization, Mechanism, Spent Zn-MnO₂ Batteries

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