Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1990-05-17
1992-03-03
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106624, 106714, 106741, 106789, 501155, C04B 736, C04B 702
Patent
active
050929321
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the production of binding materials, more particularly, to a method of producing active mineral additives for binding materials.
BACKGROUND ART
Known in the art is the production of cements by using, apart from Portland cement clinker and gypsum, additionally 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 reduce the cost of the latter 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).
The production of cement may involve the use of both artificial and natural mineral additives in an active mineral component. The natural mineral additives may include: diatomite, tripolite, opoka, "gliesh". The artificial mineral additives include blast furnace and phosphatic slags.
When blast furnace and phosphatic slags are used as mineral additives to cements, the slags are subjected to granulation by dispersing the melt of these slags and their sharp cooling. However, the hydraulic activity and whiteness index of the slags in this case are low.
The hydraulic activity of granulated blast furnace slags can be increased by their heat treatment at a temperature of 700.degree. C. for 1-5 minutes (I. N. Rogacheva "Research and development in the field of technology of water-resistant magnesia cement", Kharkovsky Politekhnichesky Institut, 1975, pp. 12-14). This is accompanied by a partial crystallization of slag glass and an increase in the defectiveness of the structure and, as a result, the activity of slags rises, thereby providing a subsequent increase in the strength of cement by 2-3 MPa. The whiteness of the additive produced amounts to 60%.
DISCLOSURE OF THE INVENTION
The present invention is based on the problem of providing a method for producing an active mineral additive with higher hydraulic activity and whiteness by modifying the structure and mineralogical composition of slag.
A BEST MODE OF CARRYING OUT THE INVENTION
This object is attained by the method of producing an active mineral additive to binding materials by heat treatment of granulated blast furnace or phosphatic slag. According to the present invention, the heat treatment in oxidizing gas atmosphere is carried out at the temperature of 1000.degree.-1200.degree. C.
The present invention makes it possible to produce additives with whiteness of 80-96% (on the basis of phosphatic slag) or 70-80% (on the basis of blast furnace slag). The hydraulic activity of the mineral additive determined by the strength of cement containing from 10 to 60% by mass slag is increased by 3-7 MPa.
According to the present invention, to reduce the temperature of heat treatment to 1000.degree.-1100.degree. C. and increase the hydraulic activity of the additive (determined by cement strength) by 5-7 MPa, it is expedient to use oxidizing steam gas atmosphere, in which the mass ratio between oxygen and steam is from 10:1 to 1:10.
According to the present invention, for a further increase in the hydraulic activity of additive (determined by the strength of cement) by 7-10 MPa it is preferable that the heat treatment of slag should be carried out by its instantaneous heating followed by its sharp cooling.
Further objects and advantages of the present invention will be more fully understood from the following detailed description of the method of producing an active mineral additive and examples of carrying out this method.
The stock material for producing an active mineral additive, according to the present invention, appears to be granulated blast furnace and phosphatic slags.
In their chemical composition phosphatic slags consist of silicon oxide, 38-42% by mass, aluminum oxide, 2-4% by mass, iron oxide, 0.1-0.3% by mass, calcium oxide, 38-48% by mass, magnesium oxide, 2-5% by mass, oxides of alkali metals, 0.4% by mass, fluorine, 1.5-2.8% by mass, and phosphorus pentoxide, 0.5-2.5%
REFERENCES:
patent: 3085022 (1963-04-01), Koch
CA97(14): 113709J, "Granulation of Slag from Steelmaking", Hamada Heavy Industries Co., Ltd., JP 57073108 AZ May 7, 1982.
CA93(8): 78411Z, "H.sub.2 O granulation of Blast-Furnace Slag", Kadona et al., JP 55020273 Feb. 13, 1980.
CA105(14) 119753Z, "Aging Treatment of Steelmaking Slag", Tsujimatsu et al., JP 61101441 AZ May 20, 1986.
CA107(16) 139889t, "Ferronickel Slag for Concrete Aggregates", Ono et al., JP 62132744 A2 Jun. 16, 1987.
Dongauzer Ivan I.
Kozhamuratov Satbek
Kurnikov Boris A.
Lerke Alexandr P.
Lerke Pavel P.
Bell Mark L.
Marcheschi Michael
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