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Clinker substitute based on calcined clay

  • US 8,906,155 B2
  • Filed: 02/24/2012
  • Issued: 12/09/2014
  • Est. Priority Date: 03/18/2011
  • Status: Expired due to Fees
First Claim
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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.

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