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

Quimica nova

Rodrigues, Michelle S.¹  Villar-Cociña, Ernesto²  Santos, Sérgio F.³  Nakanishi, Erika Y.³  Savastano Junior, Holmer³  Pinto, Pedro S.³ 

[1] Faculdade de Tecnologia de São Paulo - Centro Paula Souza, São Paulo, Brasil;Universidade Central de Las Vilas, Villa Clara, Cuba;Universidade de São Paulo, Pirassununga, Brasil

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 grassash (EGA) was produced at 700 °C, with two different treatments: hot water(EGAhw) or acid solution (EGAas). The efficiency of the treatments at removingthe potassium oxide was evaluated with the aim of using the EGA as a pozzolanicmineral addition for cement-based composites. Characterizations were carriedout by X-ray fluorescence (XRF), X-ray diffraction (XRD), pozzolanic activityby electric conductivity and application of the kinetic-diffusive model. Theanalysis evidenced that the chemical treatment was more efficient for removingpotassium oxide. The pozzolanic activity test and the kinetic parameters forthe EGAas indicated that this ash is suitable for cement-based composites.

【 授权许可】

CC BY