Clinker substitute based on calcined clay
First Claim
Patent Images
1. A method for producing a clinker substitute for use in cement production, the method comprising:
- a) predrying clay with an iron content >
1.5 wt-% in a form of iron oxides and a kaolinite content <
40 wt-% to a moisture <
10 wt-%;
b) comminuting the clay to a grain size <
2 mm;
c) calcining the clay by thermal treatment in a furnace at a temperature of 600 to 1000°
C.;
d) thermally treating the clay under reducing conditions at a temperature of 600 to 1000°
C. so as to form a reduction product;
e) intermediately cooling the reduction product to a temperature <
300°
C.; and
f) finally cooling the reduction product.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for producing a clinker substitute for use in cement production includes predrying clay with an iron content >1.5 wt-% in a form of iron oxides and a kaolinite content <40 wt-% to a moisture <10 wt-%. The clay is comminuted to a grain size <2 mm. The clay is calcined by thermal treatment in a furnace at a temperature of 600 to 1000° C. The clay is thermally treated under reducing conditions at a temperature of 600 to 1000° C. so as to form a reduction product. The reduction product is intermediately cooled to a temperature <300° C. and finally cooled.
-
Citations
19 Claims
-
1. A method for producing a clinker substitute for use in cement production, the method comprising:
-
a) predrying clay with an iron content >
1.5 wt-% in a form of iron oxides and a kaolinite content <
40 wt-% to a moisture <
10 wt-%;b) comminuting the clay to a grain size <
2 mm;c) calcining the clay by thermal treatment in a furnace at a temperature of 600 to 1000°
C.;d) thermally treating the clay under reducing conditions at a temperature of 600 to 1000°
C. so as to form a reduction product;e) intermediately cooling the reduction product to a temperature <
300°
C.; andf) finally cooling the reduction product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A clinker substitute containing calcined clay, wherein the calcined clay is derived from calcination of a clay that contains <
- 40 wt-% kaolinite and >
1.5 wt-% iron in a form of iron oxides, and wherein >
90 wt-% of the iron oxides contained in the clay are present as magnetite (Fe3O4). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
- 40 wt-% kaolinite and >
Specification