Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (1): 18-23.doi: 10.3969/j.issn.1000-565X.2011.01.004

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Characterization and Accumulation of No-process Manganese Element in Bleaching Process

Zhang Xue-jin1,2  Li You-ming1   Lu Rui-jiang1   Hou Yi1   

  1. 1.South China university of technology of the pulp and paper engineering state key laboratory, guangdong guangzhou 510640;2.Zhejiang institute of science and technology light industry institute, zhejiang hangzhou 310023
  • Received:2010-03-24 Revised:2010-07-22 Online:2011-01-25 Published:2010-12-01
  • Contact: 李友明(1956一)，男，教授，博士生导师，主要从事制浆清洁生产与污染控制研究 E-mail:E—mail：ymli3@scut．edu．ca
  • About author:张学金(1980一)，男，博士，主要从事制浆清洁生产与污染控制研究
  • Supported by:

    国家自然科学基金资助项目(20776055)

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Abstract:

The research was to characterize the no-process manganese element in bleaching process by means of IR, XRD, SEM-EDS. The accumulation of no-process manganese element in eucalyptus cellulose fiber was also studied. The results showed that “fresh” manganese was tabular crystal consisted of Mn3O4, Mn(OH)2 and 7Mn(OH)2?2MnSO4?H2O, while “aged” manganese was grain crystalline consisted of Mn3O4 and MnSO4?H2O. With manganese accumulated in process stream in the range of 0～18.18 μmol/gcellulose, there was a good linear relationship between adsorbed manganese on cellulose and manganese accumulated in process stream. Approximately 40% of “aged” manganese in process stream was adsorbed on cellulose fiber, larger than adsorption capacity of “fresh” manganese, 25%. Adsorption of “aged” manganese in process stream reached the ceiling about 7.66 μmol/gcellulose. The adsorption isotherm of no-process manganese element on eucalyptus cellulose fiber was compatible with adsorption being of the Freundlish type, i.e. a dynamic exchange of particles between the suspension and the fiber surface. 1/n of “aged” manganese was 0.65, less than the “fresh” manganese with 1/n 0.81. ㏒K of “aged” manganese increased significantly compared to “fresh” manganese.

Key words: IR, XRD, SEM-EDS, no-process manganese element, accumulation, isothermal adsorption equation