Investigation on the Sedimentation Behavior of the α-Al₂O₃ Aqueous Suspension by the Combination of Two Dispersants

Abstract:

The effect of three different types dispersants on the stability behavior of alumina aqueous suspension were investigated by through sedimentation experiment , Zeta potential ,and residual porosity of sintered sample. The results showed that the optimal content and optimal sedimentation pH value of the three different types dispersants were 1.0% and aging at pH9 for PAA-NH₄, 0.8% and nearly independent of pH value for Arabic gum , 0.4, 0.2 and aging at pH9 for PAA-NH₄ and Arabic gum，respectively. The dispersion effect of the three different type dispersants was PAA-NH4 and Arabic gum> PAA-NH4 > Arabic gum. Studies have shown that the combination of PAA-NH4 and Arabic gum has a better effect than one of them on the stability of suspension. Compared with single dispersant, the sedimentation volumes of the two dispersants dispersing suspension is reduced 3%, the dosage of dispersants is reduced 26.7%.

• Periodical: Key Engineering Materials (Volumes 474-476)
• Pages: 687-692
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.474-476.687
• Online since: April 2011
• Authors: Fei Zhou Li, Yu Qiang Han, Bian Guo
• Keywords: a-Al₂O₃ Aqueous Suspension, Dispersant, Sedimentation

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