Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 148, Issue -, Pages 220-227Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2017.10.027
Keywords
Electrolytic manganese residue; Stabilization/solidification; Leaching test; Phosphate resource
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Funding
- 'Special Project of Science and Technology Innovation in Social Programs and People's Livelihood Guarantee of Chongqing'-'China' [cstc2017shmsA90016]
- 'The Doctoral Research Fund Project of Southwest University of Science and Technology'
- 'Key Project of Basic Science and Research in Cutting-edge Technologies of Chongqing'-'China' [cstc2015jcyjBX0074]
- 'National Science-Technology Support Plan Projects'-'China' [2015BAB17B03]
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This study examined simultaneous stabilization and solidification (S/S) of Mn2+ and NH4+-N from electrolytic manganese residue (EMR) using MgO and different phosphate resource. The characteristics of EMR NH4+-N and Mn2+ S/S behavior, S/S mechanisms, leaching test and economic analysis, were investigated. The results show that the S/S efficiency of Mn2+ and NH4+-N could reach 91.58% and 99.98%, respectively, and the pH value is 8.75 when the molar ratio of Mg:P is 3:1 and the dose of PM (MgO and Na(3)PO(4)12H(2)O) is 8 wt%. In this process, Mn2+ could mainly be stabilized in the forms of Mn(H2PO4)(2).2H(2)O, Mn-3(PO4)(2).3H(2)O, Mn(OH)(2), and MnOOH, and NH4+-N in the form of NH4MgPO4.6H(2)O. Economic evaluation indicates that using PM process has a lower cost than HPM and HOM process for the S/S of Mn2+ and NH4+-N from EMR at the same stabilization agent dose. Leaching test values of all the measured metals are within the permitted level for the GB8978-1996 test suggested when the dose of PM, HPM and HOM is 8 wt%.
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