Open AccessTHERMAL AND CHEMICAL TREATMENTS FOR REMOVAL OF ALKALI OXIDES OF ELEPHANT GRASS ASHES
Author(s) -
Erika Yukari Nakanishi,
E. Villar-Cociña,
S.F. Santos,
Michelle S. Rodrigues,
Pedro Sá Pinto,
Holmer Savastano
Publication year - 2014
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20140123
Subject(s) - alkali metal , environmental science , pulp and paper industry , chemistry , waste management , environmental chemistry , metallurgy , materials science , engineering , organic chemistry
Elephant grass ash (EGA) was produced at 700 °C, with two different treatments: hot water (EGAhw) or acid solution (EGAas). The efficiency of the treatments at removing the potassium oxide was evaluated with the aim of using the EGA as a pozzolanic mineral addition for cement-based composites. Characterizations were carried out by X-ray fluorescence (XRF), X-ray diffraction (XRD), pozzolanic activity by electric conductivity and application of the kinetic-diffusive model. The analysis evidenced that the chemical treatment was more efficient for removing potassium oxide. The pozzolanic activity test and the kinetic parameters for the EGAas indicated that this ash is suitable for cement-based composites