@Article{ArceSoaÁviLunCar:2017:LeOpMi,
author = "Arce, Gretta Larissa Aurora Ferrufino and Soares Neto,
Tur{\'{\i}}bio Gomes and {\'A}vila, I. and Luna, Carlos M. R.
and Carvalho J{\'u}nior, Jo{\~a}o A.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual
Paulista (UNESP)} and {Universidade Estadual Paulista (UNESP)} and
{Universidade Estadual Paulista (UNESP)}",
title = "Leaching optimization of mining wastes with lizardite and brucite
contents for use in indirect mineral carbonation through the pH
swing method",
journal = "Journal of Cleaner Production",
year = "2017",
volume = "141",
pages = "1324--1336",
keywords = "Brucite, Iron, Leaching, Lizardite, Mineral carbonation, Mining
waste.",
abstract = "This study investigated the leaching process in order to maximize
Mg and Fe extraction and to produce amorphous silica (SiO2) with
high purity. For this, a mining waste identified as S-GO was
employed; which is a serpentinite rock with high lizardite 1T and
native brucite contents. A Taguchi Experiment Design was used in
order to assess the parameters that influence the leaching process
such as: granulometry, hydrochloric acid concentration (HCl),
leaching temperature, and mass/volume ratio. Furthermore,
thermogravimetric analysis (TGA) was done to understand the
interrelation between the mineral structure and leaching
performance. Results show that lizardite 1T-bearing serpentinite
presents a low content of tetrahedral Al3+ and high octahedral
Fe3+ contents on S-GO. Native brucite delayed the formation of a
hydrated silica layer and improved dissolution of serpentines. For
this, Mg and Fe extractions are efficient, reaching 88 ± 2% of Mg
and Fe extracted during the first 30 min of reaction, under mild
process conditions: stoichiometric mass/volume ratio, 1M HCl
concentration, pressure of 1 bar, temperature of 100 °C, and 300
\μm particle size. On the other hand, an excess of acid
improves Mg and Fe extraction by only 10 ± 5% for S-GO. Such
characteristics reduce energetic penalties and costs involved on
indirect mineral carbonation processes by the pH swing method.",
doi = "10.1016/j.jclepro.2016.09.204",
url = "http://dx.doi.org/10.1016/j.jclepro.2016.09.204",
issn = "0959-6526",
language = "en",
targetfile = "gretta-leaching.pdf",
urlaccessdate = "27 abr. 2024"
}