Thermal and chemical treatments for removal of alkali oxides of elephant grass ashes

Química Nova

Rodrigues, Michelle S.¹  Santos, Sérgio F.¹  Faculdade de Tecnologia de São Paulo - Centro Paula Souza, São Paulo, Brasil¹  Villar-Cociña, Ernesto¹  Universidade Central de Las Vilas, Villa Clara, Cuba¹  Nakanishi, Erika Y.¹  Savastano Junior, Holmer¹  Universidade de São Paulo, Pirassununga, Brasil¹  Pinto, Pedro S.¹ 

关键词: kinetic-diffusive model;    potassium;    pozzolanicity.;   

DOI  :  10.5935/0100-4042.20140123

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown