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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 7    July 2015

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Preparation of MnO2 and calcium silicate hydrate from electrolytic manganese residue and evaluation of adsorption properties
LI Chang-xin(李昌新), ZHONG Hong(钟宏), WANG Shuai(王帅), XUE Jian-rong(薛建荣), WU Fang-fang(武芳芳), ZHANG Zhen-yu(张振宇)

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:Electrolytic manganese residue (EMR), a high volume byproduct resulting from the electrolytic manganese industry, was used as a cheap and abundant chemical source for preparing MnO2 and EMR-made calcium silicate hydrate (EMR-CSH). The MnO2 is successfully synthesized from the metal cations extracted from EMR, which can effectively recycle the manganese in the EMR. By the combination of XRD, SEM and EDX analysis, the as-prepared MnO2 is found to exhibit a single-phase with the purity of 90.3%. Furthermore, EMR-CSH is synthesized from EMR via hydrothermal method. Based on the detailed analyses using XRD, FT-IR, FE-SEM, EDX and BET surface area measurement, the product synthesized under the optimum conditions (pH 12.0 and 100 °C) is identified to be a calcium silicate hydrate with a specific surface area of 205 m2/g incorporating the slag-derived metals (Al and Mg) in its structure. The as-synthesized material shows good adsorption properties for removal of Mn2+ and phosphate ions diluted in water, making it a promising candidate for efficient bulk wastewater treatment. This conversion process, which enables us to fabricate two different kinds of valuable materials from EMR at low cost and through convenient preparation steps, is surely beneficial from the viewpoint of the chemical and economical use of EMR.

 

Key words: electrolytic manganese residue; manganese dioxide; calcium silicate hydrate; adsorption

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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