Grinding burnt lime (calcium oxide, CaO) requires specialized mills that can handle its highly abrasive and sometimes sticky nature, as well as its reactivity with moisture. Here are the most common types of mills used for grinding burnt lime:
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1. Ball Mills
– How it works: Uses steel balls inside a rotating drum to crush and grind the lime.
– Best for: Medium to fine grinding (typically down to 45–100 microns).
– Advantages:
– Reliable and widely used.
– Can handle both dry and wet grinding (though dry is preferred for burnt lime).
– Disadvantages:
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energy consumption.
– Requires regular maintenance due to abrasion.
2. Vertical Roller Mills (VRM)
– How it works: Uses rollers to crush and grind lime against a rotating table.
– Best for: Fine to ultra-fine grinding (down to 10–50 microns).
– Advantages:
– Energy-efficient compared to ball mills.
– Better particle size control.
– Disadvantages:
– Higher initial cost.
– Sensitive to feed material variations.
3. Hammer Mills
– How it works: Uses rotating hammers to impact and shatter the lime.
– Best for: Coarse to medium grinding (100–500 microns).
– Advantages:
– Simple design, easy maintenance.
– Good for softer or less abrasive materials.
– Disadvantages:
– High wear on hammers if lime is very abrasive.
– Limited fine-grinding capability.
4. Raymond Mill (Roller Mill)
– How it works: Uses spring-loaded rollers to crush lime against a rotating ring.
– Best for: Medium-fine grinding (50–200 microns).
– Advantages:
– Low power consumption compared to ball mills.
– Good for small-to-medium scale production.
– Disadvantages:
– Not ideal for very fine or ultra-fine grinding.
5. Jet Mills (Fluid Energy Mills)
– How it works: Uses high-speed air jets to collide particles and achieve ultra-fine grinding.
– Best for: Ultra-fine grinding (<10 microns).
– Advantages:
– No moving parts, low wear.
– Produces very