Use of the clayey cover of bauxite deposits of the Amazon region for geopolymer synthesis and its application in red ceramics

• The predominance of kaolinite in the sample contributes to its application in geopolymer synthesis. • The best synthesis parameters were determined through Box-Behnken design: 3.4–3.8Si/Al, 1–1.1Na/Al, and temperature of 100 °C. • Mechanical strength of up to 47.78 MPa was obtained by geopolymers. • Immersion in water for 24 h does not affect the mechanical strength of the geopolymers. The exploitation of bauxite deposits in the Amazon region...