Calcium chloride can be classified based on its form and purity, as well as its industrial uses:

1. Forms

Anhydrous Calcium Chloride: A dry, white solid used primarily for de-icing, dust control, and as a drying agent.

Dihydrate Calcium Chloride (CaCl₂·2H₂O): Contains two water molecules per formula unit and is commonly used in concrete acceleration and brine solutions.

2. Purity and Grades

Technical Grade: Used in industrial applications and may contain impurities. It’s suitable for de-icing, dust control, and oil recovery.

Food Grade: Meets stricter purity standards for use in the food industry, such as in cheese-making and pickling.

Pharmaceutical Grade: Highly pure and used in medical applications or as a reagent in laboratories.

3. Industrial Uses

De-Icing Agent: For melting ice and snow on roads and sidewalks.

Dust Control Agent: To reduce dust on unpaved roads and in mining areas.

Concrete Additive: To accelerate the setting time of concrete.

Drying Agent: Used to absorb moisture in various applications.

Water Treatment: For hardness adjustment and impurity removal.

These classifications help determine the appropriate application and handling procedures for calcium chloride.