Dihydrate Calcium Chloride Flake
1.Material properties
Calcium chloride dihydrate is hydrated inorganic salt with the chemical formula CaCl₂·2H₂O, also known as crystalline calcium chloride or industrial calcium chloride dihydrate. It appears as a white or grayish-white granular, flaky, or lumpy solid. Its density is 2.15 (25℃), melting point is 782℃, and boiling point exceeds 1600℃. It is highly hygroscopic, readily deliquescing when exposed to air, releases heat when dissolved in water, and its aqueous solution is slightly alkaline.
This substance is mainly produced through the purification and concentration of ammonia-soda process waste liquid or by reacting hydrochloric acid with limestone. Its main applications include de-icing agents, antifreeze, food coagulants, calcium fortifiers, and rubber coagulants. Industrial applications include construction, textiles, and metallurgy. The product requires a calcium chloride content of ≥68%. It should be stored in a cool, dry environment, and protective equipment must be worn during handling to avoid dust inhalation or skin contact.
2. Process Introduction
Through research and development and numerous engineering projects, Tianli has developed a mature, stable, and efficient production process for dihydrate flake calcium chloride. It provides customers with a comprehensive service including design, supply, installation, commissioning, and after-sales support, perfectly solving the difficulties in processing hydrochloric acid and calcium chloride.
The dihydrate calcium chloride flake production unit mainly includes an evaporation section and a flake drying section. The low-concentration calcium chloride solution first enters the evaporation system to evaporate to more than 68%, then is sent to the flake forming machine to form flakes, and then is sent to the fluidized bed dryer for drying via conveying equipment. After drying, the finished product is cooled and then enters the silo.
After evaporation, the steam in the process section is cooled and turned into condensate, which is then recycled and treated. The exhaust gas from the drying system is purified in two stages—by a cyclone dust collector and a wet scrubber—before being discharged in compliance with emission standards.
3.Technical Advantages
1）Evaporation section
A. The evaporation section has mature technology, stable operation, and can meet the evaporation needs of calcium chloride stock solution of different concentrations. It is also easy to operate.
B. To address the issue of strong chloride ion corrosiveness in calcium chloride solutions, key equipment and components are made of chloride ion-resistant materials, such as TA9 and TA10, to reduce equipment maintenance frequency and ensure equipment lifespan.
2) Flake drying section
A.The scraper of the flake machine has a special design to ensure uniform flake shape;
B. The fluidized bed air distribution plate adopts a patented three-layer side-blowing air distribution plate structure, with the parts in contact with the material polished. The unique design and reasonable distribution of the air distribution plate ensure uniform distribution of air velocity and air pressure throughout the bed, uniform mixing of materials within the bed, and no dead corners, ensuring sufficient mass and heat transfer between the materials and hot air and the internal heat exchange tube bundle.
C. The upper bed of the equipment adopts an enlarged section structure, which reduces the airflow velocity, promotes the natural settling of material particles, significantly reduces the amount of dust carried with the exhaust gas, and reduces the load on the subsequent dust removal system.
D. Cyclone is used for primary coarse separation, followed by secondary separation by a wet dust collector, achieving a fine powder recovery rate of over 99 %, ensuring high material yield and meeting environmental emission standards.
3) Control
a. It integrates complete DCS control logic, enabling fully automated operation from feeding, evaporation, drying to discharging, and supports preset and automatic switching of multiple process parameters.
b.The system collects and displays key process parameters such as feed rate , heat medium temperature , medium flow rate, and system differential pressure in real time. The system is automatically adjusted in a chain, and the system operates stably on its own, ensuring a stable and controllable production process.
4)Technical Benefit
(1) Significantly reduced steam consumption
The entire system can be designed specifically for the owner's material parameters to ensure reasonable equipment selection. The evaporation system can maximize the utilization of steam heat, and the fluidized bed's high fluidization mass transfer efficiency reduces steam consumption by 15%.
(2)Significantly optimized power consumption
Thanks to precise equipment selection and optimized equipment structure, heat utilization efficiency has been greatly improved, the flow rate of drying medium has been reduced, and the power consumption of electrical equipment has been reduced by 10% .
(3)Good product quality
The parts of the equipment that come into contact with materials are made of titanium or stainless steel, which greatly reduces the impact of chloride ion corrosion and fully guarantees product quality. At the same time, the well-designed structure of the flake machine, the polishing treatment of the fluidized bed, and the reasonable structure of the air distribution plate reduce material residue and adhesion within the equipment , and ensure the uniformity of the product flake shape, ensuring that the product appearance quality meets high industry standards.