Clinker substitute based on calcined clay

摘要

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.

主权项

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.