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Technical Note Online color control of
Brazilian kaolin pulps on the bleaching process
In the global market, all the industrial sectors are forced to adapt the
product specification to more rigorous control parameters. The worldwide
tendency is headed toward product color becoming a fundamental parameter for
market acceptance. In this context, one of the difficulties in the Brazilian
industry is the lack of suitable equipment for measuring the reflectance
spectra of mineral pulps during the processing. A typical case is the use of
brightness and yellowness indexes in industrial minerals industry. The
apparatus used in this work, for online characterization of mineral pulps,
is an adapted version of the original Colorcell® equipment. Colorcell® is
one equipment originally developed by the Renner Herrmann company for use in
paint production. Tests were carried out with kaolin from Pantano Grande,
Rio Grande do Sul, Brazil. The samples of pulp were characterized through
the L* a* b* system, ISO brightness and E313-00 yellowness indexes.
Comparing the colorimetric results of the Colorcell® with the conventional
method of measuring tablets, the Colorcell® data are more saturated.
Colorcell® results have a good correspondence, stability and reproducibility
when it is compared with conventional method (dry tablets). By means of the
obtained results, the Colorcell® technology is pointed as an excellent
application in the control of the industrial minerals processing. The online
control of plants with the Colorcell® system has a great potential to
process optimization. |
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