1, used as a multi-purpose desiccant, such as for nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide and other gas drying. Used as dehydrating agent in the production of alcohols, esters, ethers and acrylic resins. Calcium chloride aqueous solution is an important refrigerant for refrigeration and ice making, which can accelerate the hardening of concrete and increase the cold resistance of building mortar, and is an excellent anti-freezing agent for building. Used as a fogging agent in port and road dust collector, fabric fire retardant. Used as protective agent and refining agent in aluminum and magnesium metallurgy. It is a precipitant for producing lake pigments. Used for deinking waste paper processing. It is the raw material for producing calcium salt.