Foaming plaster

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 38/02 (2006.01) C04B 11/02 (2006.01) C04B 14/28 (2006.01)

Patent

CA 2588799

A method of producing a foamed plaster comprises the following steps: (a) mixing plaster of Paris and calcium carbonate; (b) supplying water; and (c) adding phosphoric acid. The phosphoric acid reacts with the calcium carbonate to release gaseous carbon dioxide. It also reacts with any steel present to form an insoluble iron phosphate coating.

Une méthode de production d'une mousse de plâtre comprend les étapes suivantes : (a) mélange de plâtre de Paris et de carbonate de calcium ; (b) ajout d'eau ; et (c) ajout d'acide phosphorique. L'acide phosphorique réagit avec le carbonate de calcium, ce qui a pour effet d'émettre du dioxyde de carbone gazeux. Il réagit également avec l'acier éventuellement présent et forme alors un revêtement insoluble de phosphate de fer.

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