Controlled Flocculation Studies by Streaming Current Measurement

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Abstract
The streaming current technique was investigated for the measurement of particle charge in aqueous dispersions. The initial phase of the investigation dealt with the study of relevant measurement parameters in order to develop a measurement procedure for obtaining reproducible charge measurements. The streaming current measurement technique was applied to the study of controlled floccula-tion of aqueous dispersions of microcrystalline silica and of bismuth subnitrate. A profile of streaming current as a function of added electrolyte was obtained for these dispersions. Sediment height and redispersibility measurements were also recorded for these dispersions. It was found that the sediment height and redispersibility behavior of these dispersions as a function of added electrolyte was consistent with the particle charge conditions as indicated by the streaming current profile.

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