Alexander M. Klyushnikov, Rosa I. Gulyaeva, Evgeniy N. Selivanov, and Sergey M. Pikalov, Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-020-2109-x
Cite this article as:
Alexander M. Klyushnikov, Rosa I. Gulyaeva, Evgeniy N. Selivanov, and Sergey M. Pikalov, Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-020-2109-x
Research Article

Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings

+ Author Affiliations
  • Received: 12 February 2020Revised: 4 May 2020Accepted: 25 May 2020Available online: 27 May 2020
  • Abstract: X-ray powder diffraction, scanning electron microscopy, energy dispersive spectroscopy, thermogravimetry, differential scanning calorimetry and mass spectrometry have been used to study the products of nickel-containing pyrrhotite tailings oxidation by the oxygen in the air. The kinetic triplets of oxidation, such as activation energy (Ea), pre-exponential factor (A) and reaction model (f(α)) being a function of the conversion degree (α), were adjusted by the regression analysis. In case of a two-stage process representation, the first step proceeds under autocatalysis control and ends at α = 0.42. The kinetic triplet of the first step can be presented as Ea = 262.2 kJ/mol, lgA = 14.53 s-1, f(α) = (1 – α)4.11(1 + 1.51·10–4α). For the second step, the process is controlled by the two-dimensional diffusion of the reactants in the layer of oxidation products. The kinetic triplet of the second step: Еa = 215.0 kJ/mol, lgA = 10.28 s-1, f(α) = (–ln(1 – α))–1. The obtained empirical formulae for the rate of pyrrhotite tailings oxidation reliably describe the macro-mechanism of the process and can be used to design automatization systems for roasting these materials.
  • loading
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Share Article

    Article Metrics

    Article views (1825) PDF downloads(17) Cited by()
    Proportional views

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return