High Calcium Quicklime (or calcium oxide, or burnt lime), is obtained by calcining(controlled heating - time and temperature) limestone at temperatures above 900°C. This highly reactive product is essential to many industrial processes. Chemical formula: CaO Available products (usually defined by size gradation) : pebble, ground, milled, fluidized lime, dust-free lime (Proviacal® ), etc. Dolomitic Dolomitic quicklime is the name given to the quicklime formed from calcining a natural dolomitic limestone that contains nearly an equal molar weight percentage of calcium oxide to magnesium oxide. Ideally, this quicklime would contain 56% calcium oxide, 40% magnesium oxide, and 4% other major lime impurities such as iron oxide, aluminum oxide, silicon dioxide, and sulfur. Metgrade "MET GRADE" is a term that Chemical Lime uses to describe the quicklime that is produced from calcining naturally occurring magnesia limestone. This "MET GRADE" quicklime is generally used in the steel industry to take advantage of the increased magnesium oxide content needed in their iron or steel making processes.