TY  - JOUR
T1  - Study of Electrometalurgical Parameters of the Kaolin Bleaching Process
AU - Oswaldo Bustamante, M. AU - Mauricio Muñoz, Andrés AU - Duque Gomez, Luis Fernando AU - Espitia Nery, Martin Eduardo 
JO  - Journal of Engineering and Applied Sciences
VL  - 15
IS  - 13
SP  - 2723
EP  - 2727
PY  - 2020
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2020.2723.2727
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2020.2723.2727
KW  - Kaolin
KW  -bleaching
KW  -Electrochemical potential (Eh)
KW  -whiteness
KW  -sodium dithionite
AB  - 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.
ER  -