I have completed the available lime test for CaO% and am concerned about a low test percentage. How can I tell if my quicklime sample has undergone air slaking?
When a quicklime sample is taken from a truck or railcar it’s important that the sample be obtained from beneath the surface. Quicklime is very reactive with water and will readily react with moisture in the air. Depending on how long the top hatches were open during the loading process, as well as the humidity, the surface of the quicklime will become air slaked, or converted to calcium hydroxide from moisture in the air. The amount of quicklime that air slakes is very minimal compared to the total amount of quicklime in the truck or railcar, however, if a sample of quicklime is taken from the top surface, then the amount of air slaked quicklime could be high relative to the sample size. An unusually Low CaO% may indicate air slaking: A theoretically pure quicklime, CaO (56 lbs.) will react with water H2O (18 lbs.) to produce calcium hydroxide, Ca(OH)2 (74 lbs.). If the sample were absolutely pure quicklime, then the available CaO% would be 100%. If the same sample were to be complete
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