Flake Dihydrate Calcium Chloride Production Plan

Production Equipment for Flake Dihydrate Calcium Chloride Includes:

1. Multiple-Effect Evaporator: Concentrates the feed calcium chloride solution to at least 68%–72%.
2. Rotary Drum Flaker: Converts the concentrated calcium chloride solution into wet flakes.
3. Fluidized Bed Dryer: Dries the wet flakes and cools them to ambient temperature before packaging.

Overview of Calcium Chloride
Depending on its hydration state and application requirements, calcium chloride is available in various forms, including:

• Calcium chloride solution
• Flake calcium chloride dihydrate (CaCl₂·2H₂O)
• Anhydrous calcium chloride (powder or granular/honeycomb form)

Calcium chloride dihydrate (CaCl₂·2H₂O) exists in granular and flake forms, depending on the production process and end-use requirements. Typical industrial-grade products contain 74% to 80% calcium chloride by weight.

Challenges in Producing Flake Calcium Chloride Dihydrate
In industrial production, both the dihydrate and anhydrous forms of calcium chloride present technical drying challenges due to their physical and thermodynamic properties:

1. Melting Behavior During Drying
   Calcium chloride exhibits melt-like behavior during drying. As the temperature increases, it can dissolve into its own crystallization water at a critical solubility point. This leads to softening and agglomeration or lump formation.
2. High Dehydration Temperature Requirement
   The melting point of saturated calcium chloride solution at standard pressure is about 170°C. For the production of flake calcium chloride dihydrate, the solution must be concentrated to saturation and then cooled and solidified into flakes. This process requires:

   Sufficient heat input for evaporation to reach the desired concentration

3. Precise temperature control to ensure stable supersaturation and uniform crystallization during flaking
4. Complex Heat and Mass Balance Calculations
   The drying of calcium chloride differs significantly from standard surface dehumidification. In addition to removing free water, it also requires extraction of crystallization water. This involves considering the heat of vaporization and lattice breakdown energy. Therefore, heat calculations for calcium chloride drying are more complex, requiring considerations of phase transitions, enthalpy changes, and mass transfer behavior under temperature gradients.

Equipment Description
The flake calcium chloride dihydrate production equipment uses calcium chloride solution as the raw material, producing flake dihydrate through concentration, cooling/flaking, and drying processes.

The plant consists of the following components:

1. Double-Effect Forced Circulation Evaporator, along with a final concentrator to concentrate the calcium chloride solution to about 68%–70%.
2. Rotary Drum Flaker, converting the concentrated liquid calcium chloride into wet flakes.
3. Fluidized Bed Dryer, which further dries the wet flakes to alternately produce 78% calcium chloride dihydrate or 94% anhydrous calcium chloride.
4. Automatic Weighing and Packaging Machine, with a capacity of 25 kg per bag.

System Advantages

1. The calcium chloride solution is concentrated using a multi-effect evaporator, flaked into wet flakes, and dried using a fluidized bed dryer—all steps can be fully automated.
2. The fluidized bed granulator requires no manual feeding, reducing labor intensity and ensuring a better operating environment.
3. All exhaust points are equipped with multi-stage scrubbers and demisters, ensuring dust removal while recovering materials, thus meeting environmental protection standards.
4. The equipment has a simple structure with few operating points. The main unit is maintenance-free, and auxiliary equipment uses conventional conveyors with minimal maintenance requirements.
5. The process enables multi-product output from a single system, allowing for alternate production of 77% flake calcium chloride dihydrate or 94% fl