| Full text | |
| Author(s): |
Arce, Gretta L. A. F.
;
Neto, Turibio G. Soares
;
Avila, I.
;
Luna, Carlos M. R.
;
Carvalho, Jr., Joao A.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | JOURNAL OF CLEANER PRODUCTION; v. 141, p. 1324-1336, JAN 10 2017. |
| Web of Science Citations: | 11 |
| 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 (HCI), 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 HCI concentration, pressure of 1 bar, temperature of 100 degrees C, and 300 gm 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. (C) 2016 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 13/21244-5 - EXPERIMENTAL ESTUDY OF CO2 MINERAL SEQUESTRATION BY pH-SWING PROCESS |
| Grantee: | Gretta Larisa Aurora Arce Ferrufino |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |