sand dryer

The three-pass sand dryer is a professional drying equipment independently developed for dry-mix mortar production lines. It is mainly used for continuous dehydration of wet materials such as river sand, manufactured sand and quartz sand for mortar production.

Adopting a three-layer concentric sleeve composite heat exchange structure, the wet sand turns back and forth inside the drum and fully contacts with hot air for efficient heat exchange. The equipment can stably dry wet sand with an initial moisture content of 8%-20% to a finished product moisture content of 0.5%-1.0%, fully meeting the raw material standards for dry-mix mortar, tile adhesive, putty mortar and other building materials.

Matched with feeding machines, belt conveyors, hot blast stoves and dust removal systems, it forms a fully automatic drying production line. It supports 24-hour continuous stable operation, effectively solving common mortar quality problems such as caking, unstable strength and short shelf life caused by undried wet sand, and is the core supporting equipment for standard dry-mix mortar plants.

• Precise Moisture Control for Mortar Grade: Equipped with optimized combined lifting plates to ensure uniform material dispersion. The finished sand moisture content is stably controlled at 0.5%-1.0% without uneven drying, completely avoiding mortar moisture regain and caking, and ensuring stable finished mortar quality.
• High Energy-Saving Efficiency with Three-Pass Structure: The thermal efficiency is increased by more than 35% compared with traditional single-drum dryers. The outer drum is equipped with a thermal insulation layer to reduce heat loss, greatly reducing fuel consumption and production operation costs.
• Compact Structure & Small Floor Space: The three-layer nested integrated design shortens the overall equipment length. It features flexible layout, suitable for new construction and renovation of various dry-mix mortar production lines, saving plant construction area.
• Wear-Resistant & Durable: The drum body and lifting plates are made of high-strength wear-resistant manganese steel to resist scouring and abrasion of sand and gravel. The optimized sealing structure effectively prevents air and material leakage and reduces on-site dust pollution.
• Multi-Heat-Source Compatibility: It can be flexibly matched with natural gas, diesel, biomass particles, coal-fired and other hot blast stoves, adapting to different energy conditions of various factories and regions.
• High Automation & Easy Operation: Equipped with variable-frequency feeding and drum speed regulation systems. Optional online temperature and humidity monitoring system realizes real-time parameter adjustment, reducing manual operation and maintenance costs.
• Moderate Discharging Temperature: The temperature of finished dried sand is ≤60℃, which can be directly transported to the sand silo for storage without additional cooling process, improving production efficiency.
• Standard Environmental Protection Performance: It can be supporting with cyclone dust removal and bag dust removal systems to ensure up-to-standard exhaust gas emission, meeting the environmental protection acceptance requirements of building material factories.

Basic Working Conditions: Initial moisture content of wet sand 12%-18%; final moisture content ≤1.0%

General Technical Parameters

• Drum Speed: 3~6.5r/min (variable frequency adjustable)
• Hot Air Inlet Temperature: 450~650℃
• Exhaust Air Temperature: ＜120℃ (protects dust removal bag)
• Applicable Materials: 0~5mm mortar sand, including river sand, manufactured sand, quartz sand and tailing sand
• Power Supply: 380V/50Hz; non-standard customization is available

• Follow the standard startup sequence: start dust removal fan → dryer main machine → feeding conveyor → ignite hot blast stove. Preheat the drum for 30 minutes first, then feed materials gradually. Forbid large-scale feeding with cold drum.
• Keep uniform feeding at all times. Strictly prevent large mud blocks and sundries from entering the drum to avoid blockage. Pre-screening of wet sand is recommended.
• Do not overload the equipment beyond the rated capacity, so as to avoid unqualified drying effect and equipment overload damage.
• Monitor the moisture content of finished sand and hot air temperature in real time, and adjust feeding speed and combustion power timely.

• Stop feeding first before shutdown, and keep the drum running for 15-30 minutes to completely empty the residual sand inside the drum.
• Gradually reduce the temperature of the hot blast stove. Do not shut down the machine directly under high temperature to prevent local thermal deformation of the drum.
• Turn off the main machine and fan only after the drum is fully cooled down.

• Check the lubrication of supporting wheels and retaining wheels and the tightness of sealing parts daily to avoid air leakage and material leakage.
• Clean the adhered sand on the inner wall of the drum and the accumulated materials on the lifting plates weekly to maintain stable heat exchange efficiency.
• Inspect the blockage of dust removal pipes and filter bags monthly to avoid poor exhaust and reduced drying efficiency.
• It is forbidden for personnel to approach the rotating drum during equipment operation. Power-off and hanging warning signs are mandatory for maintenance.
• No flammable articles are allowed in the heat source area, and fire extinguishing equipment shall be equipped in the workshop.
• Completely empty the sand inside the drum and do anti-rust treatment for long-term shutdown.

The dried sand shall be stored in a closed silo to prevent re-absorbing moisture from the open air. Do not add admixtures before the dried sand is fully cooled.

• Core Application: Dry-Mix Mortar Production Line
• Sand Processing Plant
• Decorative Building Materials Production
• Production Line Renovation Project
• Building Material Industrial Park