The Importance of Moisture Levels in Limestone

During the production of quicklime, quarried limestone is crushed, screened and washed to remove impurities before the calcination process, or to fulfill the needs of the customer. It is used in the construction industry, glass making, cement, paper, iron and steel, sugar refining or one of the many other industries using limestone as a raw material.

The MCT460 Series moisture measurements allow the rejection of the finer wet impurities, like clay, sand and iron-bearing minerals, from the crushed limestone.

The MCT460 Series is also utilized to identify the moisture content of the finely crushed limestone leaving the secondary crusher, and dryer — depending on if one is applied or not. Moisture needs to be tracked to guarantee corrective measures can be taken to avoid blockages from occurring within the screeners. This also guarantees the levels fulfill the customer’s specifications.

Limestone Production

Limestone is known to be mined rock or quarried. The processed material has been crushed and transported throughout sizing screens where it is saturated with water to eliminate undesirable material before being stored and transported, or exposed to additional processing.

Measurement Location

Several Measurement Locations are Feasible:

  • Above a conveyor leaving the final dryer or crusher (0 to 1% moisture)
  • Over a conveyor before the final crusher (0 to 5% moisture) to allow the removal of impurities.

Gauge Installation

A MCT460 Series sensor must be placed 6–15″ from the product. Product flow should be constant and of adequate depth so that the transporting medium is not noted by the sensor. If the flow is discontinuous, a gating option could be utilized to allow measurement only when the product is viewed.

Measurement Performance

Source: KPM Analytics

Measurement Location Target % Typical Accuracy %
Limestone (50-100 mm) Post First Crusher 0-5% 0.2%
Finer Crushed Limestone Post Final Crusher 0-2% 0.15%

 

The Importance of Moisture Levels in Limestone

Image Credit: KPM Analytics

The Importance of Moisture Levels in Limestone

Image Credit: KPM Analytics

The Importance of Moisture Levels in Limestone

Image Credit: KPM Analytics

The Importance of Moisture Levels in Limestone

Image Credit: KPM Analytics

This information has been sourced, reviewed and adapted from materials provided by KPM Analytics.

For more information on this source, please visit KPM Analytics.

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