Calcium Chloride is a significant inorganic salt and multifunctional additive, renowned for its strong hygroscopicity, excellent heat of solution, and low-temperature properties. It plays a critical role in numerous industrial and technological fields. Its production primarily employs the reaction of hydrochloric acid with limestone (calcium carbonate), with the mainstream process being the acid-base neutralization of "calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide". By-product calcium chloride also comes from the waste liquor of the ammonia-soda (Solvay) process for soda ash production.

❋ Aliases: Snow Melt (for road deicing), Drying Calcium Chloride
❋ English Name: Calcium Chloride
❋ Chemical Formula: CaCl₂ (common commercial forms: CaCl₂·2H₂O, CaCl₂·6H₂O)
❋ Molecular Weight: 110.98 (anhydrous), 147.01 (dihydrate), 219.08 (hexahydrate)
❋ CAS Number: 10043-52-4 (anhydrous), 10035-04-8 (dihydrate), 7774-34-7 (hexahydrate)

Key Properties: Extremely hygroscopic, high solubility, significant freezing-point depression, exothermic upon dissolution

Frontier Application Scenarios

1. "Performance Regulator" in New Energy and Energy Storage

   • Calcium-ion battery electrolyte: Serves as core electrolyte for emerging multivalent ion batteries, providing calcium ion transport channels;

   • Phase change energy storage material: Calcium chloride hexahydrate acts as a low-cost, high latent heat phase change material for building energy storage and industrial waste heat recovery.

2. "Dust Suppressant and Solidifying Agent" in Environmental Remediation

   • Eco-friendly road dust control: High-concentration solutions sprayed on mining roads for long-term dust suppression via hygroscopic agglomeration;

   • Soil stabilization and solidification: Functions as an ionic stabilizer for treating soft soil foundations, improving engineering soil strength.

3. "Protective Medium" in Biotechnology and Pharmaceuticals

   • Cell cryoprotectant: Used in biobanks as a freezing medium matrix to reduce ice crystal damage to cells;

   • Blood anticoagulation aid: Provides calcium chelation function in certain blood collection and processing procedures.

4. "Process Intensifier" in Green Chemical Industry

   • Gas drying and purification: Acts as an efficient desiccant for deep dehydration of industrial gases;

   • Azeotrope breaker for alcohol separation: Serves as an extractive distillation agent in the rectification of ethanol or isopropanol to break azeotropes.

Technological Breakthroughs and Sustainable Development

• High-end product purification: Employs recrystallization-spray drying combined technology to produce food and pharmaceutical grade products with low sodium and heavy metal content;

• Composite function development: Develops environmentally friendly deicing salts for different temperature zones by compounding with magnesium chloride and sodium chloride, reducing corrosion to vegetation and concrete;

• Circular economy model: Large-scale recycling and utilization of by-product calcium chloride solutions from ammonia-soda and oxime processes, followed by purification and concentration for resource utilization;

• Energy-saving process innovation: Utilizes solar energy or industrial waste heat for solution concentration, significantly reducing the energy consumption of anhydrous calcium chloride production.