Blending & Proportioning
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Lime Slurry
Blending & Proportioning |
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Blending & Proportioning |
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In 2003, a customer had an experimental job for his state that required the coating of the
virgin aggregate prior to its introduction into the drum mixer with an accurately blended
slurry of lime and water. The customer had his own ideas for the design of the slurry blending
and aggregate coating hardware. SYSTEMS Equipment was to provide a stand alone slurry blending
control and to also modify the existing SYSTEMS ADP-100 plant automation to control the coating of
the aggregate.
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The customer provided slurry blending hardware that included a lime storage silo, water holding tank, and a slurry mixing tank on load cells.
Slurry was to be produced on a batch basis in the mixing tank. This tank was supplied with variable speed agitators that would
be automatically controlled as required.
The slurry from the mixing tank will be transferred to a holding tank as required during plant production. Plant production slurry requirements would be drawn from this holding tank. The batching production of slurry would repeat automatically at a rate sufficient to satisfy plant production needs. |
| SYSTEMS Equipment provided a stand alone control panel for controlling all the equipment used to produce the lime and water slurry. The control provides both fully automatic and manual control of all components. User entered values of lime SpGr, target lime to water ratio, batch size, timing, and agitation requirements were provided. Data log hardcopy recordation was also provided. |
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A method of proportioning the slurry, by mass, into the drum mix process was also required. The fixed volume / variable speed, direct coupled pump skid capable of reliably metering the slurry material, was provided by SYSTEMS Equipment. The rate control of this pump skid would be provided by the existing SYSTEMS ADP-100 Drum Mix plant automation. |
| The customer was already using SYSTEMS ADP-100 Drum Mix automation. SYSTEMS updated the control software in the system to include the slurry pump skid control. The high moisture content of the slurry was computed automatically from the user entered lime to water ratio and the appropriate moisture compensation was applied to the measured virgin scale rate. The slurry control was appropriately time delayed to be proportioned to the aggregate rate exactly at the point of slurry injection. A computer assisted calibration procedure was supplied for the calibration of the slurry pump skid. Slurry proportioning was also included as part of the regular automation data logging. |
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SYSTEMS Equipment Corporation 903 Third Ave. SW Waukon, IA 52172 Phone 563/568-6387 Fax 563/568-6224 |
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