What is the Crystallizers?

Crystallization is a process of separating solid and liquid thus crystallizers are a machine that works on the solid-liquid separation technique of forming solid crystals from a liquid solution, with the help of them we convert wastewater into solid crystals and clean water. So, a crystallizer eliminates various liquid wastes to create zero liquid discharge also known as ZLD.

This complete process of crystallization is divided into two parts which are

1.       Primary nucleation

2.       Secondary nucleation.

The first part which is also known as primary nucleation involves the growth of new crystals and the other part also known as secondary nucleation perpetuates growth and thus the second part is the main stage that causes mass production of crystals.

Cooling crystallizer

Cooling Crystallizer type of crystallizer works on the crystallizer cooling method for converting liquid into crystals.

Crystallizers cooling is mainly divided into two types:

•          Vacuum Cooling Crystallizer
•          Surface Cooling Crystallizer

Application

Cooling crystallizer is used for separation of Na₂SO₄, KCl, MgSO₄, Dextrose Monohydrate, and Honey.

Evaporative Crystallizer

Evaporative crystallizer type of crystallizer works on the crystallizer evaporative process for converting liquid into crystals. Crystallizers evaporative are mainly divided into three Types:

Type	Particle size Produced
1. Forced Circulation Crystallizer	0.2 – 0.8 mm
2. Draft Tube Baffle (DTB) Crystallizer	0.8 – 2.5 mm
3. OSLO Type Crystallizer	1.5 – 5.0 mm

Applications:

Nacl, NH₄Cl, (NH₄)SO₄, Sucrose

Wastewater plants for chemicals / Pharmaceuticals

Oslo Crystallizer

Oslo type crystallizer is also termed as a classified-suspension crystallizer. This type of crystallizer is one of the oldest designs developed for the production of large, coarse crystals.

The basic design criteria for this crystallizer is twofold:

1.       It provides help in DE supersaturation of the mother liquor by contact with the largest crystals present in the crystallization chamber

2.       It also supports in keeping most of the crystals in suspension without contact by a stirring device, thus enabling the production of large crystals of the narrow size distribution

Typical products are:

·         (NH4)2 SO4

·         Na2SO4

·         AgNO3

·         hydrated monosodium glutamate

·         mono ammonium phosphate (MAP)

Vacuum Crystallizer

Vacuum crystallizers can be differentiated into two types that can be used to crystallize the solution they are continuous and batch crystallizer. Crystallizers vacuum uses condenser with a booster for maintaining a vacuum inside the crystallizer body. This vacuum supports to generate a supersaturated solution when very low operating temperatures are required. 

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