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2004•Journal of Inorganic MaterialsRequires access

Effect of Adsorption Processes on the Rheology of A1_2O_3-H_2O-PAA Suspensions

Li Deng

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Abstract

The rheological behaviors of α-Al2O3-H2O-PAA suspensions prepared by two-stage adsorption (at two different pH values) were studied. The results show that the stability of the suspension with a final pH 6.5 is improved considerably if it experiences an adsorption stage at pH above the iep of the alumina. The pH values of the first adsorption stage have a great impact on the stability of slurries. When the pH value increases from 8.0 to 10.0, the viscosity of the slurry decreases and the stability is enhanced. But when the pH reaches 11.0, the viscosity of the slurry increases and the stability declines. Increasing the time of the first adsorption stage is helpful to the stabilization of suspensions, due to improved homogeneity of the distribution of PAA on the particle surfaces

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What this paper is about

The rheological behaviors of α-Al2O3-H2O-PAA suspensions prepared by two-stage adsorption (at two different pH values) were studied. The results show that the stability of the suspension with a final pH 6.5 is improved considerably if it experiences an adsorption stage at pH above the iep of the alumina. The pH values of the first adsorption stage have a great impact on the stability of slurries. When the pH value increases from 8.0 to 10.0, the viscosity of the slurry decreases and the stability is enhanced. But when the pH reaches 11.0, the viscosity of the slurry increases and the stability declines. Increasing the time of the first adsorption stage is helpful to the stabilization of suspensions, due to improved homogeneity of the distribution of PAA on the particle surfaces

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Available abstract

The rheological behaviors of α-Al2O3-H2O-PAA suspensions prepared by two-stage adsorption (at two different pH values) were studied. The results show that the stability of the suspension with a final pH 6.5 is improved considerably if it experiences an adsorption stage at pH above the iep of the alumina. The pH values of the first adsorption stage have a great impact on the stability of slurries. When the pH value increases from 8.0 to 10.0, the viscosity of the slurry decreases and the stability is enhanced. But when the pH reaches 11.0, the viscosity of the slurry increases and the stability declines. Increasing the time of the first adsorption stage is helpful to the stabilization of suspensions, due to improved homogeneity of the distribution of PAA on the particle surfaces

Key concepts: Adsorption, Rheology, Slurry, Materials science, Chemical engineering, Viscosity, Suspension (topology), Homogeneity (statistics)

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