Lithium Hydroxide Monohydrate & Carbonate Drying Machine

More and more new energy industries pay attention on drying process for their products, such as:

Lithium salts: lithium hydroxide monohydrate &anhydrous lithium hydroxide drying
Ternary precursor & High nickel ternary cathode material drying
Cobalt sulfate, nickel sulfate and other metal salts drying
Electrolyte additives, etc

Ordinary Ternary Positive Electrode	V.S	High Nickel Ternary Positive Electrode
Feeding raw material	Metal salt (Nickel cobalt manganese hydroxide) Lithium carbonate	Feeding raw material	Metal salt (Nickel cobalt manganese hydroxide) Lithium hydrate
Mixing & loading		Mixing & loading
One time sintering	Air	One time sintering	Pure oxygen
Coarse & fine crushing		Coarse & fine crushing
Sieving		Washing Dehydration	Deionized water
Coating	Coating agent	Drying
Loading		Sieving
Second sintering	Air	Coating	Coating agent
Sieving		Loading Second sintering	Pure oxygen
Deironing		Sieving
Batch mixed packing		Deironing Batch mixed packing
Finished product		Finished product

Precursor

The water content of the precursor after filtration and washing is 10-20%. The influencing factors of drying process include drying time, temperature and atmosphere. Under the condition of without increasing magnetic foreign matter, some problems can be avoid effectively by vacuum belt dryer, such as high temperature (< 150℃), easy oxidation and other requirements of the precursors.

Technological conditions of precursor preparation:

1. Ammonia concentration
2. PH value
3. Reaction temperature and duration
4. Solid content, composition content, impurities
5. Atmosphere of reaction
6. Stirring intensity

Drying process conditions：

1. Precursor particle size control (fine powder)
2. Crystal morphology control (structure)
3. Metal foreign body control (impurities)

Drying Method

Tray/Disc Drying
Paddle Drying
Drum Drying
Double Cone Drying
Vacuum Drying
Film Drying

Features of Vacuum belt dryer:

Effective control of magnetic foreign bodies and metal impurities in terminal products
During the whole drying process, the material is in a relatively static state to preserve the crystal shape of the product to the greatest extent
Continuous drying, gradient heat transfer, all on-line parameters controllable
The drying time is short (60-150min) at the temperature allowed by the product (40-250℃)
Clean, pollution-free production conditions and online recovery of organic solvents (continuous drying, closed system, effective in-place cleaning)
Drying under vacuum environment, reducing the entry of carbon dioxide, ensuring the product quality

Some of questions about Tray/Disc Dryer

Is disc drying a gentle process?

—No, because the product can be damaged for the following reasons:

The mechanical stress caused by the rotary rake increases the risk of magnetic foreign matter and metal impurities
In the process of material moving along the helix, a small amount of material is overheated and deteriorated, forming hot spots, increasing the difficulty of cleaning
During the feeding process, wet materials may fall directly into the chassis, resulting in unqualified moisture
During the operation of whole equipment, a small amount of material dust tend to float on the top of the machine, resulting in material backmixing