Journal
HYDROMETALLURGY
Volume 193, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2020.105311
Keywords
Electrolytic manganese residue; Anode iron plate; Manganese; Ammonia nitrogen; Surfactant
Categories
Funding
- National Key R&D Program of China [2018YFC1903500]
- National Natural Science Foundation of China [21806132]
- Science and Technology Program of Guizhou Province-China [[2019]2863]
- Sichuan Province Science and Technology planKey Research and Development [19ZDYF0911]
- State Key Laboratory of Solid Waste Reuse for Building Materials [SWR-2017-004]
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Electrolytic manganese residue (EMR) contains a lot of manganese (Mn2+) and ammonia nitrogen (NH4+-N), which can cause environmental pollution. In this study, surfactant and anode iron plate were used to synergistically enhance NH4+-N and Mn2+ leaching from EMR. The Characteristics of EMR, Mn2+ and NH4+-N leaching mechanism, and the leaching test were systematically studied. The results showed that the leaching efficiencies of Mn2+ and NH4+-N were 89.4% and 65.9%, respectively, when the current density was 20 mA/cm(2) and iron as the anode plate, the mass of H2SO4 was 13 wt%, solid-to-liquid ratio of 1:5 at 20 degrees C reacting for 120 min. In addition, when the surfactant concentration of tetradecyl trimethylammonium chloride (TTC) was 100 mg/L, the leaching efficiency of Mn2+ and NH4+-N in EMR respectively increased from 89.4% to 97.1% and from 65.9% to 98.4% by adding electric field. The leaching efficiencies of Mn2+ and NH4+-N were 28.5% and 93.7%, respectively, which was higher than that attained under the same condition without an electric field and TTC surfactant. Meanwhile, electric field changed the movement and charge distribution of charged particles on the surface of SiO2 and CaSO4 center dot 2H(2)O particles and released soluble compound salt containing Mn2+ and NH4+-N. TTC surfactant also improved the hydrophilic and hydrophobic properties of the EMR surface and promoted the wetting ability of the particles and the leaching of Mn2+ and NH4+-N. This study shows that TTC surfactant and anode iron plate can enhance NH4+-N and Mn(2+)leaching from EMR.
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