The three-in-one filter dryer, also known as a deacidification dryer, integrates filtration, washing, and drying in a single unit.

Designed for sensitive powders such as lithium hexafluorophosphate and lithium salt additives that are susceptible to oxidation and hydrolysis and must be protected from air exposure, the equipment combines fully enclosed processing, inert gas protection, and no intermediate material transfers. Materials remain enclosed from feeding through discharge, reducing moisture uptake, oxidation, contamination, and material loss.

The equipment is suitable for lithium battery materials, fine chemicals, pharmaceuticals, electronic chemicals, and related applications.

Operating Principle: Three Core Processes in One Unit

The solid–liquid mixture enters through enclosed piping and undergoes three successive processes within the same chamber: filtration → washing → drying.

• Positive pressure or vacuum separates the solids from the liquid.

• Washing solvent is introduced to displace residual mother liquor from the filter cake.

• Jacket heating and a vacuum system then enable low-temperature drying.

Operating Process: Five Steps Under Full Containment

01 | Feeding

The solid–liquid mixture enters the equipment through fixed, enclosed piping.

02 | Filtration

Positive pressure or vacuum drives solid–liquid separation, forming a uniform filter cake.

03 | Washing

A measured quantity of washing solvent is introduced to remove residual mother liquor and impurities.

04 | Drying

Jacket heating, combined with a high-vacuum environment, enables efficient drying at low temperatures.

05 | Discharge and Conveying

Once drying is complete, the material is automatically discharged under containment. The equipment can connect directly to a pneumatic conveying system for transfer to a downstream storage silo.

Key Features

• Designed for air-sensitive materials: Developed for materials such as lithium hexafluorophosphate and lithium salt additives that are highly sensitive to air. The enclosed process protects materials from oxygen and moisture to maintain chemical stability.

• Fully automatic feeding and discharge: Filtration, washing, and drying take place automatically within a single unit, eliminating manual transfers between process stages.

• Fixed piping connections: Fixed inlet and outlet piping eliminates the need to connect flexible hoses on site, removing leakage risks associated with quick-connect couplings.

• No agitation required: The equipment operates without an agitator, avoiding crystal damage caused by mechanical forces.

• Fully enclosed processing for high cleanliness: A sealed structure and nitrogen protection prevent external contaminants from entering the process.

• Efficient heat transfer and drying: Uniform heat transfer through the jacket, combined with vacuum drying, provides efficient heat utilization.

• Durable, easy-to-replace filter screen: High-strength, corrosion-resistant filter media and a horizontal arrangement provide a large filtration area, reduce the tendency to clog, and simplify replacement.

Optional Configurations

Core functional modules can be selected according to operating conditions and specific production requirements:

• Solvent recovery system: Condenses and recovers volatile organic solvents to reduce consumption and support environmental compliance.

• Enclosed pneumatic conveying system: Transfers finished products under dust-tight containment, maintaining an enclosed material handling process.

• Clean-in-place (CIP) system: Provides fully automatic cleaning without disassembly, supporting multi-batch production and high cleanliness requirements.

• Explosion-protected control system: Configured for hazardous operating environments, with safety interlocks to support safe production.

Typical Applications

Lithium Battery Materials

Electrolyte materials such as lithium hexafluorophosphate and lithium salt additives.

Fine Chemicals and Pharmaceuticals

Highly reactive, highly sensitizing, or oxidation-sensitive raw materials and intermediates.

Electronic Chemicals

Fine powders with stringent requirements for moisture, impurities, and cleanliness.

Specialty Polymers

High-performance materials containing organic solvents or requiring strict control of air exposure.

With containment, process integration, and automated control at its core, the fully automatic three-in-one filter dryer addresses oxidation, contamination, material loss, and safety challenges in sensitive powder production.

It supports improved product quality, production efficiency, and resource utilization across demanding powder processing applications. Customized process solutions are available to match each customer’s material characteristics and capacity requirements.