Manufacturing process of calcined clays in a rotary kiln with color control
AssigneeCementos Argos S.A.
InventorsDiego Fernando Muñoz, David Julian Sotelo, Carlos Augusto Orozco, Claudia Patricia Rodriguez
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Abstract
A method for manufacturing calcined clays comprising extracting and mixing raw clays; dosing a reducing agent to the mixed raw clays and homogenizing the resulting mixture; reducing the particle size of the mixture to less than 10 mm; heating the mixture in a flash dryer or flash calciner until the mixture has between 0% and 5% moisture; calcining the dried mixture from 600 to 900° C., maintaining an oxygen concentration between 1 and 5%; and cooling the calcined clay from 900° C. to 120° C., and uses of such calcined clay resulting from the claimed method in cement and/or a cementitious material for preparing concrete.
Claims10
A method for manufacturing calcined clays comprising:
- i. mixing different raw clays;
- ii. dosing a reducing agent to the mixed raw clays of step (i) in a proportion of more than 5% wt and up to 25% wt, and homogenizing the resulting mixture;
- iii. reducing the particle size of the mixture of step (ii) to less than 10 mm;
- iv. drying the mixture of step (iii) in a flash dryer until the mixture has between 0% and 5% moisture;
- V. calcining the dried mixture of step (iv) from 600 to 900° C., maintaining an oxygen concentration between 1 and 5%;
- and
- vi. cooling the calcined clay to 120° C.;
- wherein the reducing agent of step (ii) comprises coal ash.
Dependencies are inferred from the claim text.