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Feb 26, 2012

Calcium hydroxide slurry is a suspension of calcium hydroxide in water. The calcium hydroxide or lime slurry results from the mixing of dry hydrated lime with water in a tank equipped with a slurry agitator. The resulting product is a lime slurry which has a concentration (lime/water ratio) that varies from 0.5% to 30%. For example a 10% lime slurry would equals 100 grams of hydrated lime to 1 Liter of water or 0.83 pounds per gallon. Passed 30% this could be more considered as a paste than lime slurry.

If a lime slurry has a lime/water concentration of less than 30%, the solution will be free-flowing, and easy to pump transfer with many available pumps. We recommend peristaltic (hose pumps) or progressive cavity pumps to transport the lime slurry in an efficient and reliable way. The lime slurry mixing tank can be attached to the pumps (skid mounted) or can stand alone, either way it is up to the user to determine what level of automation and security he would like on his lime slurry system (automatic or manual). The lime slurry is a highly effective, low cost alkali that is easy to feed, monitor, and control. Lime slurry can be used in a variety of industrial, municipal, and environmental applications, such as:

  • pH adjustment
  • Sludge stabilization
  • Water Softening
  • Metal precipitation
  • Odor control

Storage and feed systems are simple but require nonetheless specific and reliable dry storage (silo, hopper, big bag unloader, bin, etc), discharge (mechanical bin activator, arch breaker… ) and feed system (screw conveyor, pneumatic transport, etc.). Typical problems with dry-to-slurry feed systems, such as compacted lime, bridging, scaling or dust emission can be easily avoided with an adequate lime handling system.

Efficient lime bulk storage and feed as well as and lime slurry solution packages provide several environmental and safety advantages, ease air permit requirements and reduce potential injuries associated with dry chemical handling.
Calcium hydroxide slurry is a low-cost chemical compared to quicklime, which requires expensive and high maintenance lime slakers or simply another chemical like caustic soda and its stable pricing allows users to evaluate and manage both short and long-term operating budgets.