Abstract. In this research, the effect of physical and chemical modifications of low-grade bauxite (LB) with particle size of 200 mesh were studied. Here, we demonstrate chemically technique to synthesize low-grade bauxite/CeO 2 composites using Ce(NO 3 ) 3 .6H 2 O with weight variations of 0.5, 1 and 2 g. The effect of Ce(NO 3 ) 3 .6H 2 O concentrations on BET surface area of prepared low-grade bauxite/CeO 2(0.5) (ALB0.5), low-grade bauxite/CeO 2(1) (ALB1), and lowgrade bauxite/CeO 2(2) (ALB2) composites were observed. The results showed the BET surface area of LB is 59.85 m²/g. After acid activation with 1M HNO 3 , activated low-grade bauxite (ALB) has BET surface area of 101.6 m²/g. By chemically modification with Ce(NO 3 ) 3 .6H 2 O in concentration ranging from 0.5; 1 and 2 g, the BET surface areas were reduced in the respectively order of 94.5, 87.9, and 85.5 m²/g for ALB0.5, ALB1, and ALB2. With the increase of the Ce(NO 3 ) 3 .6H 2 O concentration, the BET surface area reduced compare to those found in the ALB. The acid activation treatment has significant effect compare to the chemical modification using Ce(NO 3 ) 3 .6H 2 O.
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