Ive heard of a Type N and a Type S hydrated lime. What is the difference between the two and can I use a Type N hydrated lime when the requirement calls for a Type S?
The “N” in the Type N hydrated lime refers to Normal and the “S” in Type S hydrated lime refers to Special. When thinking about these two types of hydrated limes the simplest way to think of them is that Type N is used primarily for its chemical nature and Type S is used in construction. The reason why a Type S is different involves milling (physical size) characteristics, etc. However, a key factor involves how the hydrated lime is produced. In both types of products the process starts with quarrying limestone CaCO3 (calcium carbonate), breaking it up into pebbles, then heating (calcining) the pebble to a high temperature which results in CaO (calcium oxide) being formed as well as CO2 (carbon dioxide). Hydrated lime is produced from the exothermic reaction of CaO (calcium oxide) with H2O (water) to produce Ca(OH)2. In nature, high calcium limestone does have some MgCO3 (magnesium carbonate) in it. In the lime kiln this undergoes the same decomposition reaction that calcium carbonate
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