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Lime (calcium hydroxide) is typically used for softening water. It can also be used as a coagulant, for sludge stabilization, and for pH adjustment.
General Safety Information
Lime is extremely corrosive and very dangerous to work with. All employees should be thoroughly trained in its storage, handling, use, and disposal.
Lime can cause serious damage to eyes, skin, and internal organs. Have your supplier provide you with a Safety Data Sheet (SDS). (This one if from Standard Lime Products, but get one from your direct supplier).
Lime also contains crystalline silica, which can cause a serious chronic lung disease--silicosis--if inhaled.
Be certain to read the SDS carefully and follow all requirements for personal protective equipment, storage and handling.
Lime can react violently with certain chemicals, such as acids and others as listed in the SDS, so use care to avoid proximity.
Here is the Chemical Safety Card for calcium hydroxide from NIOSH.