Crystallizers

Crystallizers

Cooling crystallization is a process in which a liquid solution is gradually cooled below its crystallization temperature and held under controlled conditions, allowing the solute to transition from a dissolved state to a solid crystalline form. During this process, crystal growth occurs spontaneously, driven by the orderly arrangement of atoms or ions into a structured lattice.

To ensure effective crystallization and product purity, the process often incorporates techniques such as controlled cooling rates, seeding, mechanical agitation, and optimized vessel design. These methods help regulate nucleation and promote uniform crystal growth.

We offer advanced crystallization systems including DTB (Draft Tube Baffle) and OSLO crystallizers. These systems are tailored for high-purity solid separation, product recovery, and precision-controlled crystallization in chemical, pharmaceutical, and battery material applications.

Working Principle of Cooling Crystallizers

Cooling crystallizers operate based on the principle that reducing the temperature of a solution decreases the solubility of the dissolved salts, which leads to the formation of solid crystals. This controlled cooling allows targeted compounds to crystallize out efficiently.

Customized Cooling Crystallizers

We design and manufacture cooling crystallizers customized to specific processing needs in chemical manufacturing, food production, pharmaceuticals, and battery material refinement. Each cooling crystallizing unit is designed to ensure precise temperature control and high product purity, according to the requirements of the application.
    1. DTB Crystallizer
    2. DTB Crystallizer
      Upward velocity in the draft tube: ≤ 1 m/s
      Settling velocity in the vapor separation chamber: ≤ 0.2 m/s
      The DTB crystallizer is a high-efficiency crystallization system designed for evaporative crystallization from supersaturated solutions. It is suitable for processes with vacuum cooling and moderate evaporation rates and is widely used in chemical processing, metal smelting, acid recovery from steel pickling, and desulfurization wastewater treatment in power plants. View Details
    1. OSLO Crystallizer
    2. OSLO Crystallizer
      Processing capacity: 0.5 – 50 tons per hour
      Crystal size: Capable of producing crystals larger than 3.0 mm
      The OSLO crystallizer is a type of fluidized bed crystallization system designed for continuous operation, offering excellent control over crystal size and purity. It is available in evaporative and cooling configurations. The fluidized bed crystallizer is ideal for producing large, well-defined crystals, particularly in processes requiring low supersaturation and extended crystal residence time. View Details

A DTB crystallizer, or draft tube baffle crystallizer, is a type of internal circulation crystallizer that continuously recirculates a crystal slurry through a draft tube and baffle system, enhancing crystallization efficiency and promoting the formation of high-quality, uniform crystals.

While DTB crystallizers are highly efficient, they are not ideal for rapid crystallization, very large crystal formation, or materials with unfavorable sedimentation behavior (either too fast or too slow). They are best used in processes requiring controlled growth and uniform crystal size.

DTB crystallizers feature an internal draft tube and baffle that create strong internal circulation with minimal external flow. This ensures uniform supersaturation, encourages steady crystal growth, and supports the formation of larger, well-defined crystals. Compared to other types, they offer lower energy consumption, but are more sensitive to process fluctuations.

The OSLO crystallizer differs in structure, operating principle, product characteristics, and process advantages. Its fluidized bed design offers improved crystal growth control, reduced nucleation, and better separation of large crystals, making it particularly suitable for specialized crystallization applications.

The choice of materials directly impacts the crystallizer’s corrosion resistance, wear resistance, and thermal conductivity. Using appropriate materials ensures long-term reliability, improves energy efficiency, and supports product quality in demanding chemical environments.

No. OSLO crystallizers are well-suited for low-temperature (or cooling) crystallization processes. They are particularly effective for materials with high crystal density and low-viscosity mother liquors, maintaining stable operation even in chilled conditions.
Turnkey Cooling Crystallization Solutions

Cooling crystallization is used to turn liquid materials into solid form by lowering the temperature rapidly below their crystallization point. This fast cooling causes the material to solidify without forming a well-ordered crystal structure, resulting in an amorphous or glassy state where molecular mobility is greatly reduced. Since the chemical bonds remain unchanged, the material retains its composition while presenting a denser, disordered structure.

Lithium Hydroxide Cooling Crystallization System
Lithium Hydroxide Cooling Crystallization System We provide LiOH cooling crystallization solutions for producing mirabilite crystals
The cooling crystallization process for lithium hydroxide is designed to remove sodium sulfate in the form of sodium sulfate decahydrate (mirabilite). It typically follows a two-stage continuous setup. In the first stage, most of the mirabilite is separated using either a two-stage pusher centrifuge or a horizontal scroll-type filtering centrifuge.
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