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The System of Gelled Foam of Clay-in-water Suspension for the Preparation of Lightweight Insulating Refractory: Part I. Formation and Gelling of Clay-Based Foam

Iman Nazeni,

Data & Software Engineering Research Group
STEI-ITB, Jl. Ganeca No.10, Bandung 40132, Indonesia


Abstract.

Under neutral conditions colloidal plates of clay in water are negatively charged . When the pH of the clay-in-water dispersion is lowered slightly, positive charges can develop on the edges of the clay plates giving rise to an edge-to-face type gelation . Sodium fluosilicate, which has a rather high acidity and which is very slightly soluble in water, can be used as gelling agent. By beating a clay slip containing, a surfaceactive agent "Teepool" and sodium fluosilicate, one can obtain a stable foam followed by formation of a firm gel. When then the wet gel is dried a solid foam product is built up.



Keywords: Chemical Engineering

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