Method of manufacturing hydrated lime
AssigneeMississippi Lime Company
InventorsRandy J. Griffard, Gerald K. Bequette, William S. Allebach, Paul J. Ramer
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Abstract
A method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles.
Claims22
A method of producing hydrated lime, the method comprising:
- providing a lime feed comprising calcium oxide and impurities;
- milling said lime feed to produce a fine ground lime, wherein said fine ground lime has a particle-size distribution of less than 80% minus 200 mesh;
- feeding said fine ground lime into an air classification system;
- removing a refined fine lime from said air classification system wherein said refined fine lime is finer than said fine ground lime and has a particle size distribution of greater than 70% minus 200 mesh;
- adding water to said refined fine lime to form damp hydrated lime;
- and
- flash-drying said damp hydrated lime to form dried hydrated lime.
A method of producing hydrated lime, the method comprising:
- providing a lime feed having greater than 0% impurities;
- milling said lime feed to produce a fine ground lime, wherein said fine ground lime has a particle-size distribution of less than 80% minus 200 mesh;
- feeding said fine ground lime into an air classification system;
- removing a refined fine lime from said air classification system wherein said refined fine lime is finer than said fine ground lime and has a particle size distribution of greater than 70% minus 200 mesh;
- adding water to said refined fine lime to form damp hydrated lime;
- flash-drying said damp hydrated lime to form dried hydrated lime;
- and
- milling said dried hydrated lime to a particle-size distribution of at least 98% minus 325 mesh;
- wherein said dried hydrated lime has a BET particle surface area of greater than 30 m2/g.
Dependencies are inferred from the claim text.