Systems and methods for separating soft burned and hard burned calcium oxide
AssigneeMississippi Lime Company
InventorsMark DeGenova, Randy J. Griffard, David Venhaus
Life of this patent
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Abstract
Systems and methods to effectively sort calcined lime (quicklime) particles to produce products with more consistent size and burn time characteristics after the quicklime particles have been created and without the use of specialized additives. Specifically, such systems and methods sort the quicklime particles below a selected size into a softer burned and harder burned fraction based on their size. The fractions are burned in the kiln together and as a singular product, but can be classified from each other after calcining.
Claims12
A method for separating soft-burned quicklime from hard-burned quicklime, the method comprising:
- grinding a limestone feedstock including limestone and impurities to a first size;
- calcining said limestone in said limestone feedstock to produce a quicklime;
- milling said quicklime into a quicklime particulate, said quicklime particulate having between 80% and 90% of its particles smaller than 100 mesh;
- separating said quicklime particles which are smaller than 100 mesh from a remainder which is larger than 100 mesh, said quicklime particles which are smaller than 100 mesh having a size distribution with two peaks in a bimodal distribution;
- and
- running said quicklime particles which are smaller than 100 mesh through a classifier to separate said quicklime particles which are smaller than 100 mesh into a soft burned and a hard burned fraction separated by a dividing point, said soft burned fraction being particles smaller than said dividing point and said hard burned fraction being particles larger than said dividing point;
- wherein said dividing point is between said two peaks in said bimodal distribution.
Dependencies are inferred from the claim text.