Description

Introduction 

Calcium chloride (CaCl₂) is an important inorganic chemical widely used in deicing, dust control, oil and gas, food processing, refrigeration, construction, water treatment, and chemical manufacturing.

Industrial calcium chloride is available in several forms, including calcium chloride solution, calcium chloride hexahydrate, calcium chloride tetrahydrate, calcium chloride dihydrate flakes, and anhydrous calcium chloride powder or granules.

Calcium chloride dihydrate (CaCl₂·2H₂O) is typically a white crystalline solid with strong hygroscopicity and excellent water solubility. Commercial products generally contain 74%, 77%, or 80% calcium chloride.

Anhydrous calcium chloride is produced by further dehydration at elevated temperatures. It is a white to off-white granular or powdery solid with a calcium chloride content typically exceeding 93% and exhibits strong moisture absorption.

Process Description 

Industrial calcium chloride solution is commonly produced by reacting dilute hydrochloric acid with limestone or acetylene sludge.

The process begins by feeding crushed limestone into a multi-stage reactor system, while dilute hydrochloric acid is continuously dosed through metering pumps at a controlled ratio. The reaction between limestone and hydrochloric acid produces calcium chloride solution together with carbon dioxide and acid-containing vapor.

The generated vapor is directed to a multi-stage acid mist absorption system, where residual hydrochloric acid is recovered to minimize emissions and improve raw material utilization.

The crude calcium chloride solution then flows into a neutralization tank, where the pH is precisely adjusted using lime milk. After neutralization, the solution enters a clarification system to remove suspended impurities before being filtered through a filter press.

The clarified calcium chloride solution is finally transferred to a product buffer tank, providing a stable feed for downstream concentration or flake/granule production.

The lime milk preparation system serves two purposes:

• Neutralizing the calcium chloride solution to achieve the required pH.

• Absorbing acid mist generated during the reaction process, allowing recovered calcium chloride solution to be recycled back into the production system.

The entire production line is designed for fully automatic, continuous operation, ensuring stable product quality, high production efficiency, and minimal operator intervention.

System Configuration

A complete calcium chloride preparation and refining plant typically includes:

•  Limestone feeding system

•  Multi-stage reaction system

•  Acid mist absorption system

•  Lime milk preparation system

•  Neutralization and clarification tank

•  Filter press

•  Finished calcium chloride solution buffer tank

•  Automatic instrumentation and PLC control system

Main Equipment Features

• High-Efficiency Multi-Stage Reactor

A multi-stage reactor system ensures complete reaction between limestone and hydrochloric acid, maximizing raw material utilization while minimizing residual solids. The enclosed reactor design effectively contains reaction gases and improves environmental performance.

• Three-Stage Acid Mist Absorption

The acid mist treatment system adopts a three-stage absorption process to efficiently recover hydrochloric acid vapor and ensure exhaust emissions comply with environmental regulations.

System Advantages

• Fully Automatic Operation

Once raw materials are fed into the system, the entire process is automatically controlled by the PLC system, minimizing manual intervention and improving production reliability.

• Complete and Efficient Reaction

The optimized multi-stage reaction process ensures thorough conversion of raw materials with minimal residue, reducing maintenance and eliminating the need for frequent reactor cleaning.

• Stable Product Quality

Precise control of reaction conditions, pH adjustment, clarification, and filtration ensures a consistently high-quality calcium chloride solution suitable for downstream concentration and drying processes.

• Environmentally Friendly Design

The enclosed reaction system combined with a high-efficiency acid mist absorption unit effectively recovers hydrochloric acid vapor, reduces emissions, and improves overall environmental performance.

• Reliable Continuous Operation

Optimized equipment design minimizes blockage, improves operational stability, and supports long-term continuous production with low maintenance requirements.

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