Three-Drum Dryer for Sand, Foundry Sand and Granular Clay

The three-drum dryer adopts a sleeve-type structure and is mainly used for drying granular materials within a certain temperature range, such as sand used in the dry mortar industry, various types of molding sand used in the foundry industry, small-particle clay in the building materials and cement industry, and small granular materials in the chemical industry that do not undergo chemical changes and are resistant to high temperatures and dust contamination. According to the requirements of different industries for the final moisture content of the dried materials, the moisture content of the dried materials can reach below 1-0.5%. Why choose a three-drum dryer? First, the sleeve-type structure allows for rapid drying of materials; second, the drum is designed with self-insulation, with a thermal efficiency of over 80%; third, the product is finely constructed and operates smoothly; fourth, the drying effect is good, with less than 8kg of coal consumed per ton of dried material; fifth, the fuel can be coal, oil, or gas, and it can dry materials under 20mm in size, whether block or powder; sixth, it reduces occupied space by about 50% compared to a single-drum dryer, reduces civil construction investment by about 50%, and lowers electricity consumption by approximately 60%; seventh, the final moisture content can be easily adjusted according to user requirements; eighth, the exhaust temperature is low, prolonging the lifespan of dust removal equipment; ninth, no large or small gear transmission is needed, using support wheels for rotation; tenth, the discharged material temperature is below 60°C, allowing for continuous production and packaging. The three-drum dryer is mainly used for sand drying in dry mortar production lines, molding sand drying in foundries, small-particle clay drying in the building materials and cement industry, small granular material drying in the chemical industry, as well as drying treatment of materials such as mineral powder, coal slime, and fly ash. People who need a three-drum dryer include dry mortar production enterprises, foundries, cement plants and building materials equipment procurement departments, chemical plant equipment maintenance departments, mineral powder and coal slime processing enterprises, EPC contractors for drying production lines, equipment distributors and stockists, and overseas procurement parties for building materials and mining projects. Under what circumstances should a three-drum dryer be chosen or replaced? When granular materials need to be dried within a certain temperature range, and the final moisture content requirement is below 1-0.5%; when space is limited and about 50% less floor space than a single-drum dryer is needed; when energy consumption requirements are strict and a 60% reduction in electricity consumption is desired; and when old drying equipment has high energy consumption, poor drying effects, severe material sticking, or high failure rates and needs upgrading. New dry powder mortar, foundry sand, or small particle clay drying production lines require efficient drying equipment. How to choose a three-cylinder dryer? Step one: Confirm the type of material and initial moisture content, and select a three-cylinder dryer according to the material characteristics; Step two: Confirm the final moisture requirement, with the dried material moisture content reaching below 1–0.5%; Step three: Confirm processing capacity, and choose the corresponding model within the 13–120 t/h range according to production line requirements; Step four: Confirm the heat source type, with options including coal, oil, steam, etc.; Step five: Confirm cylinder specifications, selecting from φ2×4.5m to φ4.2×8m based on processing capacity and space availability; Step six: Confirm motor power, choosing 5.5×2 to 22×4 kW according to cylinder specifications; Step seven: Confirm installation foundation, which should be installed on a solid concrete base with anchor bolts; Step eight: Confirm environmental protection and automation configuration, which can include a dust removal system and a central control system.

Three-cylinder dryer specifications and performance parameters table

Model	φ2×4.5m	φ2.2×5m	φ2.5×6m	φ2.7×6.5m	φ3.0×6.5m	φ3.2×7m	φ3.6×8m	φ4.2×8m
Outer cylinder diameter (m)	2	2.2	2.5	2.7	3.0	3.2	3.6	4.2
Outer cylinder length (m)	4.5	5	6	6.5	6.5	7	8	8
Cylinder volume (m³)	14.13	18.99	29.43	37.19	45.92	56.27	81.39	110.78
Cylinder rotation speed (r/min)	4-10	4-10	4-10	4-10	4-10	4-10	4-10	4-10
Maximum inlet temperature (°C)	700-750	700-750	700-750	700-750	700-750	700-750	700-750	700-750
Production capacity (t/h)	13-18	15-23	20-28	24-33	35-40	40-60	55-75	70-120
Motor power (kW)	5.5×2	7.5×2	5.5×4	7.5×4	11×4	15×4	18.5×4	22×4

General technical parameters table

Parameter	Specification
Type	Three-cylinder dryer (sleeve type)
Structural form	Three-cylinder sleeve rotary drum
Cylinder specifications	φ2×4.5m–φ4.2×8m
Production capacity	13–120 t/h
Motor power	5.5×2–22×4 kW
Maximum inlet temperature	700–750 ℃
Cylinder rotation speed	4–10 r/min
Moisture content after drying	Below 1–0.5%
Thermal efficiency	≥80%
Fuel	Coal, oil, steam
Applicable materials	Sand for dry powder mortar, molding sand for casting, small particle clay, small chemical particles, etc.
Core Advantages	Sleeve-type structure, high thermal efficiency, small footprint, low power consumption, continuous production

Dimension drawing and key dimensions: `[Image: /images/3-drum-dryer-dimension-drawing.webp]`

Material Table

Component	Standard Material	Optional Material	Description
Outer/inner cylinder	Carbon steel	Stainless steel, wear-resistant steel plate	Bears material and heat; requires high temperature resistance
Lifter/blade	High manganese steel	Wear-resistant alloy, stainless steel	Core consumable part; high wear and heat resistance
Cleaning device	High manganese steel/wear-resistant alloy	Stainless steel	Clean wall-adhered material, break agglomerates and lumps
Tire/wheel	40Cr/42CrMo forgings	Alloy steel	Quenched and tempered; withstands huge torque
Bearing	Self-aligning roller bearing	Double-row cylindrical roller bearing	Handles heavy load and thermal expansion
Heat source	Coal/oil/gas burner	Biomass, natural gas	Provides high-temperature hot air
Induced draft fan	Carbon steel/FRP	Stainless steel	Ensures airflow and dust removal effect
Distribution cabinet	Carbon steel/stainless steel	Rainproof and dustproof type	Fully automatic control
Dust collector	Carbon steel + filter bag	Stainless steel + filter cartridge	Environmentally friendly dust removal, emissions meet standards

Installation method: The three-cylinder dryer must be installed on a solid concrete foundation, which should bear the equipment's own weight and dynamic load during rotation; during installation, ensure the foundation level meets the requirements and tighten the anchor bolts according to torque specifications; after the equipment is in place, adjust the level to ensure the rotating drum is coaxial with the drive device; the drive device and drum are connected through support wheels, and the contact precision of the support wheels should be adjusted to ensure smooth transmission; the heat source, feeding machine, discharging machine, induced draft fan, dust collector, and distribution cabinet should be connected in the correct process sequence; the hot air duct should be insulated to reduce heat loss; the induced draft fan and dust collector must be tightly connected to ensure dust removal efficiency; after installation, a no-load test run should be conducted to check if the drum rotates smoothly and if there is any abnormal vibration or noise; during the loaded test run, gradually increase the feed amount, observe the drying effect and motor current, and ensure it does not exceed the rated current; a dust removal system needs to be equipped to reduce dust pollution; a central control system can be equipped to achieve online monitoring and automatic control.

Application scenario table

Industry	Application	Recommended configuration	Key requirements
Dry powder mortar	Sand drying	φ2.5×6m–φ4.2×8m	Moisture content after drying 1–0.5% or less, large processing capacity
Foundry industry	Drying of various specifications of molding sand	φ2.2×5m–φ3.6×8m	High temperature resistance, uniform drying, continuous operation
Building materials & cement	Drying of fine-grained clay	φ2.5×6m–φ4.2×8m	High thermal efficiency, small footprint
Chemical industry	Drying of small granule materials	φ2×4.5m–φ3.2×7m	Pollution prevention, corrosion resistance, controllable temperature
Mineral powder processing	Mineral powder drying	φ3.0×6.5m–φ4.2×8m	Large processing capacity, low energy consumption
Coal slime treatment	Coal slime drying	φ3.2×7m–φ4.2×8m	Anti-sticking, cleaning device, high thermal efficiency
Fly ash	Fly Ash Drying and Comprehensive Utilization	φ3.0×6.5m–φ4.2×8m	Environmental Dust Removal, Moisture Content Compliance

Note: The three-cylinder dryer is suitable for drying granular materials within a certain temperature range and can dry block materials and powders smaller than 20mm. The thermal efficiency reaches over 80%, and the moisture content of the dried material can reach below 1-0.5%. Compared with a single-cylinder dryer, it reduces the footprint by about 50%, civil construction investment by about 50%, and electricity consumption by approximately 60%. For explosive environments, an explosion-proof motor should be selected. For highly abrasive materials, it is recommended to use high manganese steel or wear-resistant alloy lifting and cleaning devices.

Selection Considerations (Comparison between Three-Cylinder Dryer and Single-Cylinder Rotary Dryer): The core differences between the three-cylinder dryer and the single-cylinder rotary dryer arethe structural form, thermal efficiency, and footprint.The three-cylinder dryer adopts a sleeve structure, with the cylinder self-insulated. The thermal efficiency reaches over 80%, reducing the footprint by about 50%, civil construction investment by about 50%, and electricity consumption by approximately 60%. The discharge temperature is below 60°C, allowing continuous production and packaging. The single-cylinder rotary dryer has a single-cylinder structure, zoned drying, anti-adhesion cleaning devices, strong adaptability, and is suitable for medium- and small-scale drying operations. When selecting, for large-scale, continuous production projects requiring high thermal efficiency, low energy consumption, and a small footprint, the three-cylinder dryer is preferred. For medium- and small-scale operations with varied material types, a single-cylinder rotary dryer can be considered.

## Technical FAQ

1. What is a three-cylinder dryer?

The three-cylinder dryer adopts a sleeve structure and is mainly used to dry granular materials within a certain temperature range, such as sand in dry mortar industries, various specification molding sands in casting industries, small-particle clay in the building and cement industries, and small granular materials in the chemical industry that are chemically stable, resistant to high temperatures, and not prone to dust contamination.

2. What is the working principle of the three-cylinder dryer?

Material enters the inner cylinder from the feed port and fully contacts high-temperature hot air. As the cylinder rotates, it is lifted by blades to form a curtain, quickly evaporating moisture. The material then sequentially enters the middle and outer cylinders, extending the drying path in the sleeve structure, and finally exits from the discharge port after reaching the required moisture content.

3. What is the moisture content after drying with the three-cylinder dryer?

Depending on the requirements for the final moisture content of the material in different industries, the moisture content of dried material can reach 1-0.5% or lower.

4. What is the thermal efficiency of the three-cylinder dryer?

The cylinder is designed to be self-insulating, with a thermal efficiency of over 80%.

5. What are the models of the three-cylinder dryer?

The models of the three-cylinder dryer include φ2×4.5m, φ2.2×5m, φ2.5×6m, φ2.7×6.5m, φ3.0×6.5m, φ3.2×7m, φ3.6×8m, φ4.2×8m.

6. What is the production capacity of the three-cylinder dryer?

The production capacity is 13-120t/h, varying according to model. φ2×4.5m is 13-18t/h, φ4.2×8m is 70-120t/h.

7. What is the motor power of the three-cylinder dryer?

The motor power ranges from 5.5×2 to 22×4kW, depending on the model.

8. What fuels can the three-cylinder dryer use?

Fuels can be coal, oil, or gas, capable of drying materials below 20mm and powdered materials.

9. What advantages does the three-cylinder dryer have compared to a single-cylinder dryer?

It reduces floor space by about 50% compared to a single-cylinder dryer, construction investment by about 50%, and electricity consumption by about 60%; thermal efficiency exceeds 80%; discharge temperature is below 60 degrees, suitable for continuous production and packaging.

10. What materials is the three-cylinder dryer suitable for?

Suitable for sand for dry mortar, foundry molding sand, fine-grained clay, small chemical granules, mineral powder, coal slime, fly ash, etc.

11. Does the three-cylinder dryer require a foundation?

Yes. It must be installed on a solid concrete foundation, which must support the equipment’s own weight and dynamic loads during rotation, with anchor bolts for fixing.

12. What are the common faults of the three-cylinder dryer?

Drum wall adhesion (excessive material humidity or cleaning device failure), overheating of bearings (poor lubrication or overload), roller wear (poor transmission), abnormal vibration (unbalanced drum or loose anchor bolts), poor drying effect (insufficient heat source temperature or uneven feeding).

13. What wear parts are on a three-drum dryer?

Lifting plate, lifting plate, sweeping device, roller, support wheel, bearings, etc. Among these, lifting plate and cleaning device are core wear parts; it is recommended to choose high-manganese steel or wear-resistant alloy materials.

14. Can a three-drum dryer be customized?

Can be customized with cylinder specifications, heat source type (coal/oil/gas), motor power, sheet material (high manganese steel/stainless steel/wear-resistant alloy), dust removal system, induced draft fan, distribution cabinet, central control system, etc.

15. How to maintain and care for a three-drum dryer?

Regularly check the wear of the lifting plate, lifting plate, and cleaning device, and replace or adjust in a timely manner; Regularly check bearing lubrication, and replenish or replace grease; Regularly check the wear of the support wheels; Regularly check whether anchor bolts and connecting bolts are loose; Regularly clean accumulated material and foreign objects inside the drum; Regularly check the operating status of the heat source, induced draft fan, and dust collector.

16. Can a three-drum dryer be used for dry mortar production lines?

Yes, it is an ideal equipment for drying sand in dry-mix mortar production lines. After drying, the moisture content can reach below 1-0.5%, with high thermal efficiency and a small footprint.

17. Can a three-drum dryer be used in the foundry industry?

Yes, suitable for drying various specifications of molding sand in the foundry industry, capable of drying block and powdered materials under 20mm, with good drying performance, and coal consumption per ton of dry material less than 8kg.

18. What is the discharge temperature for the three-drum dryer?

Discharge temperature below 60°C, allowing continuous production and packaging.

19. Does the three-drum dryer comply with RoHS and REACH?

Standard equipment complies with RoHS and REACH regulations and does not contain SVHC substances of high concern. Subject to product inspection reports for specific details.

20. How to choose the model of a three-drum dryer?

Select the model corresponding to 13-120t/h based on production line capacity requirements, confirm the drying effect according to the initial and final moisture content of the material, choose a three-cylinder dryer with a small footprint according to site space, and select coal, oil, or gas fuel based on heat source conditions.

Technical FAQ

What should be included in a mill or dryer RFQ?

Include feed size, moisture, throughput, final size, heat source or power supply, operating hours and dust-control requirements.

How are wear and energy costs controlled?

Use the correct feed size and operating range, monitor liners or hammers and keep airflow, lubrication and loading stable.

Authoritative references

For standards and safety context, see ISO standards and the U.S. Mine Safety and Health Administration. Confirm the exact local requirements for your project.

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