MANUFACTURING PROCESS OF POZZOLAN WITH COLOR CHANGE AND POZZOLAN THUS OBTAINED
First Claim
1. Manufacturing process of pozzolan with color change, comprising the following steps:
- Heating (1);
consists of heating the a raw material blend to a temperature between 100-350°
C. until the material is dried to a range of moisture between 0-5% (wet basis);
Mixture (2);
consists of mixing dry raw materials that came from the heating step, with 1-5% of fuel mass fraction according to the hematite concentration of the raw material;
Calcining (3);
consists of heating the blend of fuel with the dry raw materials to a temperature between 700-900°
C., with oxygen concentration between 1-5%; and
Cooling (4);
consists of an initial step with fast decrease in temperature to 600°
C. and a final step with pozzolan temperature decrease to 120°
C.
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Accused Products
Abstract
The present invention refers to a manufacturing process of artificial pozzolan which has the final color gray. In order to perform the processes in the desired way, the kiln atmosphere shall contain low oxygen concentration and the presence of reducing agents. However the presence of carbon monoxide at the kiln outlet is not desirable, due to environmental impacts and the increase in specific heat consumption of the kiln. So the process described in this invention comprises the following steps: heating (1), which consists of heating the raw materials to a temperature between 100-350° C. until drying of the material to a moisture mass fraction of 0-5% (wet basis); mixing (2), which consists of mixing the dry raw materials from the heating process with the right proportion of fuel, in from 1% to 5% in mass fraction, according to the concentration of hematite present in the raw material; calcining (3), which consists of heating the fuel and raw materials blend to a temperature between 700-900° C., with oxygen concentration between 1-5% and, finally, cooling (4), which consists of an initial step of rapid decrease in pozzolan temperature until 600° C. and a final step of slow decrease in pozzolan temperature until 120° C.
2 Citations
14 Claims
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1. Manufacturing process of pozzolan with color change, comprising the following steps:
-
Heating (1);
consists of heating the a raw material blend to a temperature between 100-350°
C. until the material is dried to a range of moisture between 0-5% (wet basis);Mixture (2);
consists of mixing dry raw materials that came from the heating step, with 1-5% of fuel mass fraction according to the hematite concentration of the raw material;Calcining (3);
consists of heating the blend of fuel with the dry raw materials to a temperature between 700-900°
C., with oxygen concentration between 1-5%; andCooling (4);
consists of an initial step with fast decrease in temperature to 600°
C. and a final step with pozzolan temperature decrease to 120°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification