The Slaking Process

Quicklime is delivered to the slaker reactor compartment by the volumetric rotary feeder (or optional gravimetric belt feeder). By adding a special vibrating bias plate to the feeder, lime is continuously fed (not slug fed) into the slaker, while water enters through the water feed and control system. This allows the agitator to mix the water and quicklime into a heavy slurry continuously and vigorously. This vigorous mixing allows the calcium oxide to react with the water to form calcium hydroxide. The resulting hydrated lime slurry flows over the weir into the integral grit separator where the grit collects in the bottom of the settling chamber and is carried upward on the grit remover screw and is disposed of at the grit discharge.

The hydrated lime slurry flows out through the slurry discharge. An optional vibrating screen can be provided in place of the integral grit remover when screen separation is preferred.

Special Slaking Features

Water Control. There are three separate water feed systems on each slaker:

SLAKING WATER - Slaking water flow rate at start-up (when slaker temperature is low) is 3.3 parts water to 1 part lime. Once the slaking temperature reaches a preset point, the water feed is controlled by temperature. This assures a constant slaking temperature and hydrated lime partical size.

TORQUE OR CONSISTENCY WATER - The viscosity of the slurry in the slaker varies based on slaking temperature and quality of lime. To maintain a thick but flowable slurry, water is added whenever the slurry viscosity begins to impede mixing and outflow from the slaker. This is done automatically by monitoring the power draw of the slaker mixer. The torque water valve is used for adding emergency cooling water to the slaker.

DILUTION WATER - Dilution water is added to the slaker for steam removal, weir sprays, grit separator dilution water.

Dual Wall Construction. To conserve heat of reaction, Chemco Systems slakers incorporate an insulated dual wall design.

Slaker High Level Device. A slaker high level device, located at the slurry discharge, prevents spillage in the event of discharge line blockage.

Other Features

• Minimum retention time of ten minutes.
• Fully automatic control panel with PCL control.
• Water supply rotameter panel with modulating valves and/or solenoid valves and manual shut-off valves.
• Minumum water pressure of 40 psig.

Available Capacities

• 100 lbs/hr through 24,000 lbs/hr.

Typical Drawings (Requires Adobe Acrobat Reader)
Dimensions	Piping and Instrumentation Diagram

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