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US 6,190,449 B1Granted
Method for eliminating waste sulfurous acids coming from industrial treatments and for obtaining stable products
AssigneeCarrieres du Boulonnais
InventorGuy Beauvent
Life of this patent
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Abstract
The method comprises the steps of: preparing a belitic crude cement, neutralizing waste sulfurous acids by means of at least clay-calcareous fines which are thus transformed into artificial gypsum, and adding said artificial gypsum to the belitic crude cement.
Claims9
A method for manufacturing a belitic sulfo-aluminous aluminous cement comprising:
- (a) neutralizing waste sulfurous acids containing from 1 to 35 weight % of acid by adding thereto clay-calcareous fines to produce gypsum;
- (b) preparing a belitic crude cement from residues of washings of calcareous stones, said calcareous stones having a composition comprising:
- 20-30 weight % CaCO3
- 30-50 weight % clay
- 5-25 weight % SiO2
- 5-25 weight % Al2O3
- 5-50 weight % of waste products comprising metal, oxides;
- (c) adding the gypsum obtained from step (a) to the belitic cement obtained from step (b) form a belitic sulfo-aluminous cement.
5 more elements
A cement clinker obtained by (a) neutralizing waste sulfurous acids by adding thereto clay-calcareous fines to produce gypsum;
- (b) preparing a belitic crude cement from residues of washings of calcareous stones, said calcareous stones having a composition comprising:
- 20-30 wt % CaCO3
- 30-50 wt % clay
- 5-25 wt % SiO2
- 5-25 wt % Al2O3
- 5-50 wt % of various waste products which comprise metal oxides;
- (c) adding the gypsum obtained from step (a) to the belitic cement obtained from step (b).
4 more elements
Dependencies are inferred from the claim text.