The influence of single and compound dispersant on the sedimentation performance of modifiedultrafine Al(OH)3 powder aqueous suspension was studied by the determination of the settlement rate and the Zeta potential.The results showed that the type and dosage of the dispersant have remarkable impacts on the dispersion stability.Using the mixture of DP-270 and Sodium C16 alkylbenzenesulfonate(mass ratio=1:1)in the Al(OH)3 aqueous suspension,the dispersion stability Was improved effectively.As for spherical particles with electricity in a size of 0.55～1.67μm,the settlement rate in aqueous solution can be calculated with a modified formula:V=Vo[esp(ζn-ζ0)/ζ0]-1.
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