What is Lime Slurry?
Lime, or calcium hydroxide
Typical lime slurry application
The dominant construction-related use of lime is soil stabilization for roads, building foundations, and earthen dams. Lime is added to low-quality soils to produce a usable base and sub-base. Hydrated lime has long been acknowledged to be a superior anti-stripping additive for asphalt pavements. It also helps resist rutting and fracture growth at low temperatures, reduce age hardening, and improve the moisture resistance and durability. A recent study shows lime holds significant advantages over other additives for hot mix asphalt roads, including long-term cost savings and increased durability. Perhaps the oldest and most traditional use of lime has been in mortar and plaster, because of its superior plasticity and workability.
Lime (calcium hydroxide) Pump Applications:
- Lime chemical provides an economical solution for removing impurities in clean water, wastewater and sewage treatment processes. Also helps regulate pH control of acidic wastewater.
- Lime is also used in industrial plants where waste effluent must be neutralized prior to returning to the environment.
- A chemical solution containing lime is sprayed on to crops, typically citrus fruit and grapes as a pesticide.
- Lime is used to help with clarifying liquids in an assortment of food production applications.
- Paper/pulp production uses lime for both the production of sodium hydroxide and as part of the bleaching process and neutralization of acid wastewater.
Pumping Lime Slurry
Adding lime with water, as a slurry, allows the solution to be pumped considerable distances, making transporting the material easier than mechanically loading into trucks. As you can imagine, a lime slurry can pose challenges for all types of pumps. Due to these challenges, pump manufacturers are constantly coming up with new designs for reducing the detrimental effects that lime slurry can have on their equipment and production rates. Some of these design ideas are featured on multiple types of pumps including slurry pumps, centrifugal pumps, and peristaltic pumps. Typically, the answer to effectively pumping lime is to keep the fluid moving constantly to maintain the chemical in suspension. With lime slurry, it is important to constantly be reaching a critical line velocity in which there is enough flow and turbulence to prevent sediment from building up in dead spots or crevices found throughout the system. Ideally, the pipeline should be as smooth as possible with an open flow path, making sure the flow rate is directly proportional to speed.
Lime is harmful when in contact with skin and eyes, making it very important to ensure the fluid is fully contained and not able to be splashed around. Lime chemical is strongly alkaline and very abrasive as the powder chemical format is insoluble in water and the particles will have a wearing effect on moving parts where there are constant friction and velocity.
EDDY Pump for Lime Slurry
Using the EDDY Pump will provide several advantages when it comes to pumping lime slurries. For one, EDDY Pump is designed with a recessed rotor that comes in minimal contact with the slurry, helping to prevent wear to this critical pump component. The recessed rotor also allows for abrasive materials along with large sized solids to pass through without clogging or otherwise getting stuck in the pump. Additionally, the EDDY Pump will provide enough turbulence and flow to ensure the slurry does not settle at the bottom of the pipeline creating excessive limescale issues.
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