Abstract:The effect of thermal treatment on talc-magnesite in the presence of air in the temperature range 500-1OOO", was studied by nitrogen adsorption and followed by t.g.a., d.t.a. and X-ray analysis. From the nitrogen adsorption isotherms, the specific surface area as well as pore-size distribution was estimated. The surface area increased with temperature, to reach a maximum at 600". On immersion of the calcination products in water, magnesium hydroxide was formed. Decomposition of the hydration products in air at… Show more
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