Rotary Sand Dryer
Tongding three-pass rotary dryer – high-efficiency sand drying for dry mortar production. >90% thermal efficiency, final moisture ≤1%, compact footprint, and worldwide installation support.
Features:
- Capacity: 3-120 T/H (Customizable)
- Moisture Reduction: 25% → 3%
- Heat Source: Coal / Gas / Biomass
- Powdery materials: (1)Construction sands: river sand, sea sand, yellow sand, quartz sand, foundry sandplate sand, steel sand, fracturing sand; (2)Mineral & mining materials: tailings sand, copper ore sand, iron ore sand, coloredsand, fluorite powder, potash feldspar powder, sodium feldspar powder. (3)And other building materials sands and industrial bulk materials. Process: Drying → Dust Collection → Screening.
Three Pass Rotary Sand Dryer
Triple Cylinder Drying System for High-Efficiency Sand Processing
Product Introduction
Tongding Machinery's three-pass rotary sand dryer is a high-efficiency drying solution specifically engineered for dry mortar plant, designed to process wet sand and other granular materials with consistent performance, aggregates, and various granular materials. The system integrates three core stages: drying, dust collection, and screening, ensuring a complete and automated sand processing workflow.
In the drying stage, wet sand is fed from the moist-material bin through a disk feeder and wet sand belt conveyor into the rotary dryer, where it is heated by a gas combustion chamber. The dust collection system captures particles generated during drying, redirecting them to the dry sand belt conveyor. Finally, the dried material passes through a linear vibrating screen to separate different particle sizes according to customer requirements.
Technological Process
The complete sand drying process follows a continuous, automated workflow:
- Material Feeding: Materials are sent into the stock bin via belt conveyor or bucket elevator, then conveyed to the belt conveyor by a disk feeder. The material enters the feed pipe where the gradient is designed to be larger than the material's angle of repose, ensuring smooth flow into the dryer.
- Rotary Drying: The drum rotates at a slight angle to the horizontal. Materials enter from one side while the heat carrier follows simultaneously. The material passes through the inner cylinder, middle cylinder, and outer cylinder, eventually reaching the discharge port and finally the discharge silo.
- Dust Collection: After the heat carrier passes through the dryer, dust-laden air is captured by a cyclone dust collector. For applications requiring stricter emission control, additional bag filters or wet dust collectors can be installed before final discharge.
- Screening: The dried material is conveyed to a linear vibrating screen, which separates qualified finished products according to particle size specifications.
Working Principle
The triple pass rotary dryer features three nested drying zones within the inner, middle and outer cylinders, which form the complete rotating body. This design enables efficient thermal processing of materials with high moisture content.
The material enters through the inlet hopper and moves into the inner cylinder, where primary heating and moisture evaporation occur. The solid material is gradually broken down as it passes through the drying zones, and finally discharged through the outlet after completing the third drying stage. Hot air generated by the furnace flows through the inner cylinder, then passes through the middle and outer cylinders, maximizing heat utilization before being sent to the cyclone dust collector for emission treatment.
Key Technical Advantages
- Three-stage drying: Material passes through 3 cylinders for extended heat exposure and uniform moisture reduction.
- Energy efficient: Hot air circulates through all three cylinders, maximizing heat utilization and reducing fuel consumption.
- Compact footprint: Nested cylinder design occupies approximately 1/3 of the space of a single-drum dryer with the same capacity.
- Integrated dust control: Cyclone + optional bag filter system ensures compliance with environmental regulations.
- Automated screening: Linear vibrating screen provides accurate particle size separation for downstream applications.
- Flexible fuel options: Gas, diesel, coal, or biomass – adaptable to local energy availability.
Applications
The dried sand produced by this system is widely used in:
- Dry mortar production plants
- Concrete batching plants
- Glass sand processing
- Foundry sand preparation
- Frac sand drying
- Construction material manufacturing
Frequently Asked Questions
What is the advantage of three-pass design over single drum?
Three-pass design allows material to travel through three cylinders, extending drying time and improving thermal efficiency by 15-20% compared to single-drum dryers.
Can this dryer handle wet sand with high moisture?
Yes, the system is designed for initial moisture up to 25% and can reduce final moisture to ≤1%.
What dust collection options are available?
Standard configuration includes a cyclone dust collector. For stricter environmental compliance, bag filters or wet dust collectors can be added.
Is overseas installation support available?
Yes, Tongding provides installation guidance, commissioning, and operator training for projects worldwide.
What fuel types can be used?
Gas, diesel, coal, and biomass fuels are all supported depending on local availability and cost.
Get a Customized Sand Drying Solution
Contact Tongding today for a tailored three pass rotary sand dryer solution based on your material type, capacity requirements, and site conditions.
Applicable Materials
Facturing Sand
Glass Sand
Iron Powder
Quartz Sand
Titanium Powder
Machine-made Sand
Slag
Stone Powder
River Sand
Specifications
| Model | Power（KW） | Capacity(T/H) | Rotary speed （r/min） | Installation Angle | final Moisture | Heat Supply Mode |
| HG1625 | 4kw | 3-8 t/h | 9 | Aclinic | ≤0.5％ | 1) Firewood 2) Pulverized coal 3) Diesel 4) Natural gas 5) not carbonizedbiomass fuel 6) carbonizedbiomass fuel |
| HG2240 | 7.5kw | 10-15 t/h | 9 | |||
| HG2250 | 7.5kw | 20t/h | 9 | |||
| HG2958 | 5.5kw*4 | 30t/h | 7 | |||
| HG3270 | 11kw*4 | 60t/h | 7 | |||
| HG3890 | 15kw*4 | 100t/h | 7 |
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