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Method to measure degree and homogeneity of alumina calcination

  • US 6,983,060 B1
  • Filed: 11/21/2000
  • Issued: 01/03/2006
  • Est. Priority Date: 11/26/1999
  • Status: Expired due to Fees
First Claim
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1. Method for measuring degree and homogeneity of calcination of alumina utilizing an image analysis device equipped with a sensitive camera in a spectral analysis window corresponding to a wavelength range equal to or in the vicinity of visible light and comprising the steps of:

  • a) mixing alumina under analysis in a liquid wherein the refractive index is, in said wavelength range, between the refractive index of a lightly calcined alumina and the refractive index of a strongly calcined alumina;

    b) preparing a slide for observation of said mixture in said image analysis device, said mixture being illuminated by stable polychromatic radiation compatible with said spectral analysis window;

    c) receiving an image by the camera and processing a signal resulting in the definition of an image composed of a given number of pixels with three calorimetric components; and

    d) statistically processing said pixels using their calorimetric components and determining the calcination degree and the homogeneity of the calcination.

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