Method and apparatus for burning CaCO.sub.3 and MgCO.sub.3 materials
OwnerJ. Friis-Hanseninventor
Life of this patent
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Abstract
A method for automatically controlling the burning process for CaCO.sub.3 and MgCO.sub.3 materials in a kiln which includes feeding burnt material and liquid reagent into a reaction chamber. Then, the amount of heat per unit weight burnt material per unit time liberated in the reaction chamber is determined. The kiln is controlled using the amount of heat determined above.
Claims21
A method for controlling burning of materials selected from CaCO.sub.3, MgCO.sub.3 and mixtures thereof in a kiln comprising burning in a kiln;
- feeding a flow of burnt material and a flow of liquid reagent, in an aqueous solution, to a reaction chamber;
- maintaining a residence time less than the time required to reach equilibrium in the reaction chamber and maintaining a substantially constant temperature in the reaction chamber;
- agitating said burnt material and liquid reagent;
- measuring the temperature and feed rate of said two flows fed to the reaction chamber;
- measuring the temperature of said agitated burnt material and liquid reagent;
- determining reactivity, a measure of the amount of heat per unit weight burnt material per unit of time liberated by reaction between said burnt material and said liquid reagent;
- and using said reactivity as a control parameter for said burning of CaCO.sub.3 and MgCO.sub.3 materials.
A method for automatically controlling the burning of materials selected from CaCO.sub.3, MgCO.sub.3 and mixtures thereof in a rotary kiln comprising burning materials selected from CaCO.sub.3, MgCO.sub.3 and mixtures thereof in a kiln;
- continuously feeding to a reaction chamber a flow of burnt material having a particle size less than about 5 mm. and a flow of liquid reagent, in an aqueous solution;
- maintaining a residence time less than the time required to reach equilibrium in the reaction chamber and maintaining a substantially constant temperature in the reaction chamber;
- agitating said burnt material and liquid reagent in said reaction chamber;
- measuring the temperature and feed rate of said two flows to said reaction chamber;
- measuring the temperature of said agitated burnt material and liquid reagent;
- measuring the heat given off or absorbed by a heat transfer means;
- determining reactivity, a quantity constituting a measure of the amount of heat per unit weight of burnt material per unit of time liberated by the reaction between said burnt material and said liquid reagent;
- using said reactivity as a control parameter for the burning of the materials;
- and regulating the rotational speed of said rotary kiln as a function of said control parameter.
Dependencies are inferred from the claim text.