Industrial Production of Calcium Chloride Product

Overview

Calcium chloride (CaCl₂) is an important industrial chemical widely used for deicing, dust control, oil and gas drilling, refrigeration, desiccants, food processing, and chemical manufacturing. Commercial calcium chloride products are commonly available as 74–77% calcium chloride dihydrate flakes and 94–95% anhydrous calcium chloride flakes or granules.

Although the manufacturing process appears straightforward, producing high-quality calcium chloride presents several technical challenges, particularly during the drying and dehydration stages.

Challenges in Calcium Chloride Production

1. Melting During the Drying Process

One of the greatest challenges in calcium chloride production is that the dehydration process involves a partial melting stage.

The solubility of calcium chloride varies significantly with temperature. Calcium chloride flakes are typically produced by cooling concentrated calcium chloride solution on a flaker. During subsequent heating and drying, the material inevitably passes through temperature ranges where partial dissolution occurs. The residual moisture dissolves part of the calcium chloride, causing particles to become sticky and agglomerate.

This phenomenon can lead to:

• Particle adhesion and caking

• Material buildup inside the dryer

• Reduced drying efficiency

• Product quality fluctuations

Careful control of the heating profile and residence time is therefore essential to ensure stable operation.

2. High Dehydration Temperature

Producing anhydrous calcium chloride requires substantially higher temperatures than simply removing free surface moisture.

Calcium chloride dihydrate gradually loses its crystal water during heating and is completely converted into anhydrous calcium chloride only at elevated temperatures. Consequently, the drying system must provide sufficiently high inlet air temperatures, typically above 260°C, together with adequate residence time to achieve complete dehydration while maintaining product quality.

3. Complex Heat Balance Calculations

The thermal design of a calcium chloride drying system is considerably more complex than that of conventional dryers.

In addition to evaporating free water, the process must also supply the energy required to remove chemically bound crystal water. Therefore, accurate heat balance calculations must consider:

• Sensible heating of the material

• Evaporation of free moisture

• Dehydration of crystal water

• Heat of dehydration

• Overall thermal efficiency

Proper thermal design is essential for achieving high production efficiency while minimizing energy consumption.

Our Complete Calcium Chloride Production Solution

We provide complete turnkey calcium chloride production plants capable of manufacturing:

• 74–77% calcium chloride dihydrate flakes

• 74–77% calcium chloride dihydrate granules

• 94–95% anhydrous calcium chloride granules

Customized process solutions are available to meet different raw materials, production capacities, product specifications, and customer requirements.

Advantages of Our Process Technology

• Continuous Reaction and Purification

The reaction and solution purification section operates continuously, providing stable product quality while effectively eliminating the intermittent exhaust emissions commonly associated with batch processes.

• Environmentally Friendly Emission Control

All exhaust gas emission points are equipped with multi-stage dust collection and mist elimination systems, ensuring emissions comply with applicable environmental standards while minimizing material losses.

• Fully Automated Production

The spray granulation and drying system is fully automated, eliminating manual solid feeding and reducing labor intensity while improving operational safety and production consistency.

• High Thermal Efficiency

Our optimized heat recovery and process integration enable the system to achieve an overall thermal efficiency of more than 90%, significantly reducing steam and fuel consumption while lowering operating costs.

• Stable Product Quality

Advanced process control ensures uniform particle size, low residual moisture, high product purity, and excellent flowability for both flake and granular calcium chloride products.

Conclusion

The production of high-quality calcium chloride requires much more than simple evaporation and drying. The unique thermal properties of calcium chloride demand careful process design, precise temperature control, and efficient dehydration technology.

With extensive experience in evaporation, drying, and granulation technologies, we provide complete calcium chloride production plants that combine continuous operation, high energy efficiency, environmental compliance, and reliable product quality. Whether producing calcium chloride dihydrate flakes or anhydrous calcium chloride granules, our customized solutions help customers maximize productivity while minimizing operating costs.