How Should Choose The Equipment For Drying Sand?

What is Sand?

Sand is a fine-grained material of small minerals or rock fragments, mainly formed by rock weathering or mineral fragmentation, with grain sizes usually ranging from 0.0625 mm to 2 mm (according to the international standard ISO 14688). Sand can be formed by the action of water, wind or ice, and it is one of the most common and abundant natural resources on earth, widely used in construction, concrete manufacturing, industry, foundry, glass making, and other applications.

Classification of Sand

According to the source of sand can be broadly categorized into river sand, sea sand, mountain sand and desert sand.

River Sand

collected from rivers, with rounded particles and low mud content, suitable for concrete for construction.

Desert Sand

too fine and smooth surface, not suitable for concrete, but can be used for special purposes such as solar thermal storage.

Sea Sand

from the coast, containing salt and shell fragments, need to be desalinated to be used in construction.

Mountain Sand

collected from mountainous areas, coarse particles, high mud content, need to be screened for use.

Sand from bodies of water, such as river, sea and lake sand, usually has a high moisture content. Sand needs to be dried before it can be used in industrial or construction applications. Most industrial sand drying processes are performed using sand drying equipment.

How To Dry Sand With A Dryer

Drying sand with a dryer is a systematic industrial process, which requires choosing the right type of equipment and controlling key parameters. The following are the detailed steps and technical points:

According to the output and thermal efficiency requirements, the common types of sand dryers are mainly as follows:

• Single drum dryer: simple structure, low price, but relatively low thermal efficiency, suitable for small and medium-scale production of 1-10 tons / hour capacity requirements.
• Double-cylinder dryer: with nested structure, longer hot air path, energy saving effect is better than single cylinder, suitable for 10-30 tons / hour capacity requirements of medium-scale production.
• Three-cylinder dryer: the highest thermal efficiency (up to 80%), small footprint, significant energy saving, suitable for large-scale or high-precision drying requirements of more than 30 tons / hour capacity requirements.

The core of dryer drying sand lies in the optimization of temperature control, hot air distribution and material residence time. The three-cylinder return dryer has the highest efficiency and is suitable for large-scale production, while the single-cylinder or double-cylinder equipment is more suitable for small-scale demand.

Dryer Drying Sand Working Process

Feeding: Wet sand enters the rotating cylinder through the feeding system, under the action of high temperature hot air, the lifting plate in the cylinder body will continuously copy up and throw the sand, forming a uniform material curtain to increase the contact area with the hot air.
Drying: the sand moves slowly to the discharging end with the rotating cylinder, and the water gradually evaporates, and after single or multiple (three-way design) heat exchanges, the finished sand, which is dried to a moisture content of ≤1%, is discharged from the discharging port, and at the same time, the exhaust gas is purified by the dedusting system and then discharged.

In the whole process, through the precise control of temperature, wind speed and material residence time, it realizes the continuous drying operation with high efficiency and energy saving

Sand Drying Production Line

The dryer drying sand production line requires a series of supporting equipment to work in concert to ensure an efficient and continuous production process.

Example of production line configuration:
Wet Sand → Disc Feeder → Belt Conveyor → Three-Drum Dryer → Vibrating Screen → Dust Removal System → Elevator → Storage Bin / Packaging Machine