@article{MAKHILLJEAS2020151319357,
    title = {Study of Electrometalurgical Parameters of the Kaolin Bleaching Process},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {15},
    number = {13},
    pages = {2723-2727},
    year = {2020},
    issn = {1816-949x},
    doi = {jeasci.2020.2723.2727},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2020.2723.2727},
    author = {M.,Andrés,Luis Fernando and},
    keywords = {Kaolin,bleaching,Electrochemical potential (Eh),whiteness,sodium dithionite},
    abstract = {The objective of this study is to present the
methodology and results of the study of chemical
bleaching process of kaolin from potentiometric
measurements in experimental systems. The bleaching of
four kaolin samples, from La Union municipality in the
department of Antioquia (Colombia) was studied at
laboratory level, considering as main variables, the
reducing agent percentage involved (Sodium Dithionite,
Na<sub>2</sub>S<sub>2</sub>O<sub>4</sub>) and the process time. The Electrochemical
potential (Eh) and pH of the system were evaluated with
a 692 pH/Ion Meter Metrohm equipment, the amount of
dissolved iron as Fe<sup>3+</sup> measured at the end of each test
using Atomic Absorption Spectrophotometry (AAS) and
the whiteness index calculated by Calorimetry. The
Electrochemical potential (Eh) variation of the system, the
changes in Fe<sup>2+</sup>/Fe<sup>3+</sup> ratio with the increase concentration
of reducing agent as well as the variation of whiteness
index W (Whiteness %) with processing time are a first
approach to the understanding of bleaching kaolin
phenomenology.}
    }