Overview

Spin Flash Dryer

A spin flash dryer combines pneumatic (air-flow) drying technology with fluidization technology. It provides continuous, high-efficiency drying of pastes, filter cakes, and slurries into fine dry powder in a single step.

<1%

Final Moisture

5-30s

Residence Time

2t/h

Evap. Capacity

Principle

How does a spin flash dryer work?

Schematic Diagram of Spin Flash Drying

Material Feeding

Wet materials such as filter cakes, slurries, or pastes are continuously fed into the system. Before drying, they are mechanically stirred and broken into a more uniform consistency to avoid large lumps.

Mechanical Dispersion

When wet material enters the bottom of the dryer, a high-speed rotating agitator strikes the material, breaking it into smaller particles. This step greatly increases surface area and prepares the material for fast drying.

Swirling Hot-air Contact

Hot air is blown into the bottom of the dryer. It enters the drying chamber in a tangential direction, creating a strong vortex airflow inside the vertical drying chamber.

Flash Drying

The particles rotate and move upward inside the drying chamber. Because the material is highly dispersed, it has a massive surface area exposed to the hot air. As a result, the moisture evaporates rapidly.

Collection

Near the top of the drying chamber there is a classification ring. Only particles that are small enough can pass through. Oversized, still-wet particles bounce back into the drying zone. The fine, dry powder is carried by the air stream to a bag filter or cyclone.

Features

Continuous Operation

Wet feed material is constantly introduced into the drying chamber and an equal amount of dried powder is continuously discharged from the collection system.

One‑Step Drying

The entire transformation from moist feed to final dry powder happens inside a single unit. This eliminates the need for separate drying stages or additional equipment.

High Efficiency

Due to the strong contact between hot air and finely dispersed particles, heat and mass transfer occur very rapidly. The moisture in the material evaporates within seconds.

Processing of Difficult Feeds

Suitable for challenging materials such as filter cakes, slurries, and highly viscous pastes. Its powerful rotor can break down feeds into fine, manageable particles.

Built-in Size Control

A classification mechanism can be integrated into the drying chamber. Fine, fully dried particles are separated and collected, while larger particles are recirculated for further drying.

Self‑Cooling

Dried particles are quickly removed from the hot zone, which reduces thermal exposure and makes the system suitable for heat-sensitive materials.

Specification

Model	Inner Dia. (mm)	Rated Power (kW)	Air Flow (m³/h)	Evap. Rate (kg/h)	Height (m)
XZG-2	200	5-10	300-800	10-20	4
XZG-4	400	10-18	1,250-1,500	25-70	4.8
XZG-6	600	20-29	2,500-5,000	40-200	5.8
XZG-8	800	24-35	3,000-8,000	60-600	6.5
XZG-10	1,000	40-62	5,000-12,500	100-1,000	7.1
XZG-12	1,200	50-89	10,000-20,000	150-1,300	7.8
XZG-14	1,400	60-105	14,000-27,000	200-1,600	8.8
XZG-16	1,600	70-135	18,700-36,000	250-2,000	10.1

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Applications

Chemical

Inorganics

Widely used for drying various inorganic materials such as metal hydroxides, carbonates, sulfates, oxides, and mineral slurries.

Colorants

Dyes

The final colorants or dye intermediates maintain consistent particle size, uniform quality, and chemical stability,

Agrochemicals

Pesticide

In pesticide formulation, the spin flash dryer is employed to convert wet pesticide filter cakes into stable dry powders.

Food

Starch & Yeast

The rapid evaporation prevent thermal degradation, preserving nutritional value, taste, and functional properties.

Drying Reference

Drying parameters for 8 materials including inlet air temperature, initial and final moisture, and actual drying capacity.
Parameter	Stearic Acid	Aluminum Hydroxide	Zinc Carbonate	Nereistoxin Oxalate	Calcium Carbonate	Iron Oxide Red	Antimony Trioxide	Cuprous Chloride
Inlet Air Temp (°C)	150	180	150	120	160	200	180	200
Initial Moisture (%)	80	55	80	30	70	60	45	30
Final Moisture (%)	0.5	1.5	1.0	1.0	1.5	0.5	1.0	3.0
Drying Capacity (kg/h)	140-160	250-280	130-170	80-110	430-470	300-350	280-320	290-310

* Data from actual production trials based on XZG-6. Parameters may vary subject to feed characteristics and equipment configuration.

FAQ

Answers to the most common technical and commercial questions from procurement managers and process engineers evaluating spin flash dryers.

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What moisture levels can be handled?

Depending on the material properties, spin flash dryers can typically process feed materials with moisture contents ranging from 10% to 80% and reduce the final moisture content to below 1%–5%.

What inlet air temperature is typically used?

The inlet air temperature typically ranges from 150°C to 300°C, depending on the material properties and drying requirements. Heat-sensitive products may require temperatures as low as 120–180°C, while inorganic minerals and chemical products can utilize temperatures up to 300°C.

How long does drying take in a spin flash dryer?

Drying in a Spin Flash Dryer typically occurs within 5–30 seconds, depending on the material characteristics, moisture content, particle size, and operating conditions.

How can a spin flash dryer be made safe for organic solvents?

You must utilize a Closed-Loop System specifically designed for solvent recovery.

Inert Gas Atmosphere – Use an inert gas to eliminate oxygen and prevent combustion.
Solvent Recovery – A condenser is installed to capture and recover the evaporated solvent from the exhaust stream.
High-Level Sealing – The system must be hermetically sealed to prevent solvent vapor leakage and air ingress.