Rotary Sand Drying Equipment

Rotary Sand Drying Equipment is a device specifically designed for drying sand and stone materials, widely used in construction, building, mining, casting and other fields. By removing the moisture in the sand, it ensures that the sand meets the moisture content standard (usually ≤5%) for subsequent processing or. The following details its structure, working principle, core parameters, application scenarios, technical features and selection points:

I. Structure Composition (Taking the mainstream rot drum sand dryer as an example)

The structure of the sand dryer is designed around "efficient heat exchange" and "continuous operation", mainly consisting of the following parts:

rum body: The cylindrical drum body is installed at an inclined angle (3°-5°), with a length designed according to the processing capacity (usually 6-2 meters), and different types of scrappers (such as lifting type, impact type, combined type, etc.) are welded inside the wall, which plays a role in lifting and spreading the sand, extending the contact time with the hot air to ensure uniform drying.

Heat source system: Provides the required heat for drying, with common types:

Coal/gas fired hot air furnace (temperature 80-600℃, suitable for large-scale production);

Biomass burner (using straw wood chips, etc., low cost and environmentally friendly);

Heat recovery device (such as factory waste gas, boiler tail gas, suitable for enterprises with heat source recovery conditions.

Feeding and discharging system:

Feeding end: Moist sand (moisture content 10%-30%) is sent into the drum through a beltor or spiral feeder, and some equipment is equipped with a pre-screening device to prevent large pieces of impurities from entering.

Discharging end: Dry sand is through a star-shaped discharger or vibrating screen, and large particles of impurities that may remain are separated at the same time.

Transmission system: Consisting a motor, a reducer, and a support wheel set, it drives the drum to rotate at a low speed (rotation speed 3-10r/min), ensuring the sand gradually moves along the inclined direction of the drum.

Hot air and tail gas treatment system:

Hot air delivery: The induced draft fan sends the hot air generated by the heat source into the drum, where it exchanges heat with the sand;

Tail gas treatment: Includes cyclone dust collector (for preliminary separation of dust)

II Applicable Materials and Scenarios

Applicable materials:

Natural sand: River sand, sea sand, mountain sand, quartz sand;

Artificial sand: Mechanized (sand after crushing of stone), recycled sand from building waste;

Special sand: Casting sand (quartz sand, zircon sand), glass raw material sand insulation material sand (expanded perlite sand), etc.

Typical application scenarios:

Construction industry: Dry wet sand in concrete mixing stations and mortar plants to ensure stable concrete strength (excessive wet sand can lead to imbalance in the mix);

Sand and stone processing: Dry the sand after washing in sand and stone factories, improving storage and transportation stability of finished sand (avoiding clumping and mildew);

Casting industry: Dry the molding sand, ensuring casting accuracy (excessive moisture can to casting defects such as blowholes and shrinkage);

Environmental protection field: Dry the recycled sand from building waste, contributing to the recycling of resources

Product advantage

Rotary Sand Dryer, as a specialized equipment for processing sand and stone materials, is widely used in construction, building materials, mining and other fields. Its core advantages are reflected in efficient, strong adaptability, energy saving and stability, etc., specifically as follows:

High drying efficiency, large processing capacity

The equipment is designed for continuous operation, and a machine can process tens to hundreds of tons of wet sand per hour, which can quickly reduce the moisture content of sand from 15%-20% to 0.55% (adjustable according to demand), meeting the needs of large-scale production, especially suitable for continuous operation scenarios such as construction sites and sand and stone factories.

Long adaptability, applicable to a variety of materials

It can not only process river sand, sea sand, quartz sand and other conventional sands, but also dry special materials as slag, fly ash, and recycled sand from construction waste, and can also cope with sand of different particle sizes (0.1-5mm). By adjusting the speed, hot air temperature and other parameters, it ensures uniform drying.

Outstanding energy saving, high thermal efficiency

The equipment usually adopts countercurrent drying process, and the hot is fully contacted with the materials, with high thermal exchange efficiency; some models are equipped with waste heat recovery devices, which can recover the heat in the tail gas for secondary use, the thermal utilization rate can reach 60%-80%, reducing energy consumption by 10%-20% compared with traditional drying equipment.

Drying effect is, quality is controllable

A special scraper structure is set inside the drum, which can evenly lift and disperse the sand, avoid local overheating or incomplete drying, that the finished sand moisture content is consistent, particle size is uniform, reduce clumping phenomenon, and improve the subsequent use performance of the sand (such as stability during concrete mixing.

Easy to operate, low maintenance cost

The automatic control system is adopted, which can monitor temperature, moisture content, feed amount and other parameters in real time, and achieve-key start and stop and intelligent adjustment, reducing labor cost; the main body of the equipment (drum, scraper) is made of wear-resistant steel, which is-resistant and wear-resistant, with low failure rate and daily maintenance only needs regular cleaning and lubrication, and the service life can reach more than 10 years