Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1990-05-17
1991-07-09
Dixon, Jr., William R.
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106741, 106789, C04B 714
Patent
active
050302884
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the production of binding materials and more particularly it relates to an active mineral additive for binding materials.
BACKGROUND ART
Known in the art is the production of cements that includes, apart from Portland cement clinker and gypsum, the additional use of active mineral additives, the weight fraction of which accounts for 5 to 60% by mass. Introduction of active mineral additives into cement makes it possible to cut down its cost and in some cases to modify the construction and engineering properties of cement (for instance cement hardening kinetics, heat release, setting periods, resistance to sulphates).
Both artificial and natural mineral additives can be used as active mineral additives in cement production. Natural mineral additives include: diatomite, tripolite, opoka, melilite marble aggregate. Artificial mineral additives include blast furnace and phosphatic slags.
Natural mineral additives have low whiteness and hydraulic activity, which the whiteness of Portland cement and its construction and engineering properties.
Known in the art is an active mineral additive, which is a heat treated mixture (at 1350.degree.-1450.degree. C.) of phosphatic slag (92-99% by mass) and sodium sulphate (1-8% by mass) (SU, A, 893925). The whiteness coefficient of such mineral active additives, according to the absolute scale, is considerably higher than that of natural mineral additives and amounts to 89-93% and the hydraulic activity of this additive determined by the amount of lime absorbed by the additive in 15 titrations is 22.9-23.8 mg.
Known in the art is also an active mineral additive, that is subjected to melting at 1350.degree.-1450.degree. C. mixture of phosphatic slag, sodium sulphate and magnesium sulphate.
The use of such mineral additive fails to considerably enhance the whiteness, and hydraulic activity of cement.
SUMMARY OF THE INVENTION
The present invention solves the problem of providing an active mineral additive, which ensures higher whiteness and hydraulic activity of the cement produced on the basis of this additive.
This object is attained by providing an active mineral additive to binding materials, comprising granulated phosphatic slag and a sulphate-containing component, according to the present invention, comprises as said sulphate containing component compries a mixture of sodium sulphate, 47.2-57.6% by mass, magnesium sulphate, 40.5-51.1% by mass, and sodium rhodonite 1.70-1.90% by mass. The following ratio of components are present in the mineral additive:
According to the present invention, the whiteness coefficient of the active mineral additive determined by the absolute scale is 96-100% and its hydraulic activity determined by the absorption of Ca(OH).sub.2 from lime solution after 15 titrations is 24.14-24.97 mg.
Further objects and advantages of the present invention will be understood from the following detailed description of the active mineral additive and examples of its production and use.
DETAILED DESCRIPTION
The active mineral additive for cement, according to the present invention, is a mixture of granulated phosphatic slag in an amount of 94-98% by mass and a sulphate-containing mixture in an amount of 2-6% by mass. The sulphate containing mixture comprises sodium sulphate (47.2-57.6% by mass), magnesium sulphate (40.5-51.1% by mass) and sodium rhodonite (1.7-1.9% by mass).
Phosphatic slag, which is the basic component of the mineral additive contained in the amount of 92-96% by mass, appears to be a product of electrothermal production of yellow phosphor.
In chemical composition phosphatic slag usually consists of 38-45% by mass of silicon oxide, 2-5% by mass aluminium oxide, 0.1-0.5% by mass of iron oxide, 38-52% by mass of calcium oxide, 2-5% by mass of magnesium oxide, 0.5-3.0% by mass of phosphorus oxide, 1-3% by mass of fluorine, 0.1-0.3% by mass of manganese oxide, 3.0-5.0% by mass of calcium, iron and manganese phosphides.
In mineralogical composition granulated slag consists of 80-95%
REFERENCES:
Dialog Abstract-SU 893925, "Active Mineral Binder Additive Contains an Electrothermal Phosphoric Slag and Sodium Phosphate Used in Decorative Building Material Mfg", Verner et al, 2/10/82.
Baiduisenov Shakhaidar S.
Lerke Pavel P.
Malkov Nikolai I.
Parimbetov Berkimbai
Ryzhov Boris G.
Dixon Jr. William R.
Marcantoni Paul
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