Dissolution Characteristics of Calcium-Based Alkaline Industrial Wastes

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Author(s)

    • Zhao Jianli
    • School of Energy and Power Engineering, Shandong University
    • Li Yingjie
    • School of Energy and Power Engineering, Shandong University
    • Han Kuihua
    • School of Energy and Power Engineering, Shandong University
    • Niu Shengli
    • School of Energy and Power Engineering, Shandong University
    • Lu Chunmei
    • School of Energy and Power Engineering, Shandong University

Abstract

A pH-stat method for measuring the dissolution rates of calcium-based alkaline industrial wastes (CAIW) in flue gas desulfurization is applied in this paper. The dissolution characteristics of two kinds of CAIW including carbide slag (CS) and magnesium slag (MS) were studied in a stirred tank at 30, 40 and 50°C, pH values of 4.3, 5.4, 6.0 and 7.5, particle sizes of 0.000–0.097, 0.097–0.105 and 0.105–0.3 mm and stirring speed of 300 rpm. The dissolution rate control step of CAIW was analyzed by using a modified shrinking core model. It was found that CS dissolution kinetics followed the film diffusion accompanied by surface reaction control, and the activation energies of the two steps were 7.89±1.0 kJ mol<sup>−1</sup> and 14.41±1.0 kJ mol<sup>−1</sup>, respectively. The MS dissolution obeyed the surface reaction model and the activation energy was 14.51±0.5 kJ mol<sup>−1</sup>.

Journal

  • JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 46(12), 827-832, 2013

    The Society of Chemical Engineers, Japan

Codes

  • NII Article ID (NAID)
    130003381998
  • Text Lang
    ENG
  • ISSN
    0021-9592
  • Data Source
    J-STAGE 
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