Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
1998-04-07
2001-02-20
Marcantoni, Paul (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
C106S693000, C106S695000, C106S745000
Reexamination Certificate
active
06190449
ABSTRACT:
FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
The present invention relates to treatment of waste sulfurous acids coming from plants in which various products are processed, in particular raw materials that contain titanium oxide and used for producing industrial TiO
2
.
In the above application as well as in most of those related with sulfurous acids, great amounts of acid effluents must be evacuated or treated.
A re-treatment generally involves concentrating the diluted acids and separating the polluting elements such as fluorides, heavy metal oxides, aluminous residues, etc.
The above treatments are very costly and not satisfactory since the diluted acids can not be easily concentrated and can not be re-cycled a great number of times, and since there is still the problem of removing the separated polluting materials.
PURPOSE OF THE INVENTION
The present invention enables a complete recovery of waste acids and a use of the so-obtained product with mineral materials advantageously obtained by an other way from other waste products, and particularly from quarry muds, steel-works slags and other refuses.
The association of the products that are obtained within the scope of the invention enables then a manufacturing of basic materials, in particular stable building and inerting products that exhibit only a small shrinkage, or even no shrinkage at all, and a good mechanical strength of about 40-50 MPa during a setting cycle of about 28 days.
Moreover, the products that are made from the invention can be used for encapsulating heavy metals, in particular zinc oxides, which is made possible due to the very low porosity of the product made according to the invention.
SUMMARY OF THE INVENTION
According to the invention, in a method for eliminating waste sulfurous acids coming from industrial treatments and for obtaining stable products, there is prepared, on a first hand, a belitic crude cement and there is neutralized, on a second hand, the waste sulfurous acids by means at least of clay-calcareous fines which are thus transformed into artificial gypsum and this articial gypsum is added to the belitic crude cement for adjusting the SO
3
amount in the belitic crude cement so as to obtain a clinker having a setting time which is variable according to the SO
3
amount, as well as other physico-chemical properties.
Various other features of the invention will moreover be revealed from the following detailed disclosure.
REFERENCES:
patent: 3870535 (1975-03-01), Minnick et al.
patent: 4997486 (1991-03-01), Bolsing
patent: 5495064 (1996-02-01), James et al.
patent: 46-038404 (1971-11-01), None
patent: 405117001 (1993-05-01), None
patent: 09067118 (1997-03-01), None
patent: 937390 (1982-06-01), None
patent: 897739 (1982-11-01), None
patent: WO 96/33133 (1996-10-01), None
Arliguie et al. “Etude De L'effect Retardateur du ZincSur L'Hydration De La Pate De Ciment Portland”Cement and Concrete Research, vol. 12 No. 1 pp. 79-86, (1982).
Arliquie et al. “Influence De La Compestion D'Un Ciment Portland Sur Son Hydration on En Presence De Zinc”Cement&Concrete Research, vol. 20, pp. 517-524 (1990).
“Use of Wastes of Sulfuric Acid Production in Concretes” Remnov Prom St-Strait Mater, Ser. 11 (Nanchno-Tekh. Ref. 56) (8) 12-13, 1981. Abstract Only.
Browdy and Neimark
Carrieres du Boulonnais
Marcantoni Paul
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