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Phase transitions relating to the pozzolanic activity of electrolytic manganese residue during calcination

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Abstract

Electrolytic manganese residue (EMR) is generated from electrolytic manganese metal (EMM) industry, and its disposal is currently a serious problem in China. The EMR were calcined in the interval 100–900°C to enhance their pozzolanic activity and characterized by the differential thermal analysis-thermogravimetry (TGDTA), X-ray diffraction (XRD), infra-red (IR) and chemical analysis techniques with the aim to correlate phase transitions and structural features with the pozzolanic activity of calcined EMR. From the phase analysis and compressive strength results, it is found that the EMR calcined within 700–800°C had the best pozzolanic activity due to the decomposition of poorly-crystallized CaSO4 under the reducing ambient created by the decomposition of (NH4)2SO4. The appearance of reactive CaO mainly contributes to the good pozzolanic activity of EMR calcined within 700–800°C. The crystallinity of Mn3O4 increases leading an unfavourable effect on the pozzolanic behaviour of EMR calcined at 900°C. The developed pozzolanic material containing 30% (mass fraction) EMR possesses compressive strength properties at a level similar to 42.5# normal Portland cement, in the range of 41.5–50.5MPa. Besides, leaching results show that EMR blend cement pastes have excellent effect on the solidification of heavy metals.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Xiao-ming Liu  (刘晓明), Yu Li  (李 宇) & Da-qiang Cang  (苍大强)

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xiao-ming Liu  (刘晓明), Yu Li  (李 宇), Da-qiang Cang  (苍大强) & Si-xun Zhou  (周思汛)

  3. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing, 100083, China

    Ling-ling Zhang  (张玲玲)

Authors
  1. Xiao-ming Liu  (刘晓明)
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  2. Yu Li  (李 宇)
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  3. Ling-ling Zhang  (张玲玲)
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  4. Da-qiang Cang  (苍大强)
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  5. Si-xun Zhou  (周思汛)
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Corresponding author

Correspondence to Xiao-ming Liu  (刘晓明).

Additional information

Foundation item: the National Natural Science Foundation of China (Nos. 51104008 and 51034008), China Postdoctoral Science Foundation Funded Project (No. 20100480202), the Research Fund for the Doctoral Program of Higher Education of China (No. 20100006120010) and the Fundamental Research Funds for the Central Universities (No. FRF-TP-12-026A)

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Liu, Xm., Li, Y., Zhang, Ll. et al. Phase transitions relating to the pozzolanic activity of electrolytic manganese residue during calcination. J. Shanghai Jiaotong Univ. (Sci.) 18, 105–110 (2013). https://doi.org/10.1007/s12204-013-1372-7

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  • DOI: https://doi.org/10.1007/s12204-013-1372-7

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