Sodium sulfate is an inorganic compound, typically a white, odorless, bitter-tasting crystalline solid or powder with hygroscopic properties. It can appear as large, colorless transparent crystals or as small granular crystals. It is widely used in fields such as water glass, glass, ceramic glazes, wood pulp, refrigerants, detergents, drying agents, dye diluents, analytical chemical reagents, and pharmaceuticals.

In the industrial production of sodium sulfate, drying is a critical step. The drying of this particular material has unique characteristics and requirements: when the moisture content is high, the material becomes sticky and tends to agglomerate (form hard crusts) on equipment surfaces; additionally, although the material itself is relatively loose in structure, its flowability is poor. An ideal drying process must meet the following specific criteria: low energy consumption, uniform heating, environmental friendliness, and the ability to reduce the product's moisture content to the required specification in a single drying pass.

To address these challenges, our company's engineering team, leveraging in-depth material analysis and years of practical experience in drying engineering, has successfully developed a high-efficiency, energy-saving, and environmentally friendly continuous disc dryer, positioning it as the core system for sodium sulfate drying. This solution has been widely applied and validated within the industry.

Conventional disc dryers often encounter material agglomeration issues when processing sodium sulfate. Agglomeration can cause scraper blades to deform or lift; material adhering to the drying discs becomes difficult to scrape off, subsequently damaging scraper arms, scraper blades, and even threaded connections. Furthermore, when the material throughput is high, wet material tends to fall directly from the upper layers to the bottom of the equipment, resulting in insufficient moisture content in the final product.

To address these issues, our company has implemented a series of targeted improvements and innovations to the standard continuous disc dryer. By integrating multiple patented technologies, we have designed an enhanced continuous disc dryer specifically optimized for the efficient drying of sodium sulfate.

Process flow overview: Wet sodium sulfate material from the previous production stage is continuously and stably fed into the top of the dryer via a metering feeder. As the material flows downward through each layer of drying discs, it undergoes indirect heat and mass transfer with the heating medium circulating inside the discs; during this process, moisture is gradually removed, achieving the desired drying effect. The dried material is finally cooled to packaging temperature (typically around 50°C) in the lower section of the equipment (specifically in the cooling zone), then discharged from the bottom outlet for packaging. The small amount of exhaust gas generated during the drying process is subjected to dust removal and purification treatment before being discharged via an induced draft fan.

Key process advantages of this specialized sodium sulfate disc drying system:

1. High efficiency and energy savings; continuous operation: The dryer employs a conduction-based heat transfer mechanism, requiring almost no large air volume; therefore, exhaust gas emissions are extremely low, and thermal efficiency can exceed 85%, far surpassing convective drying equipment.

2. Environmentally friendly with low losses; excellent operating environment: The material flows from top to bottom, with the upper layers being wet and the lower layers dry, combined with an extremely low exhaust gas velocity (approximately 0.1 m/s), effectively suppressing dust diffusion. The material is almost entirely free from being entrained by the exhaust gas, thereby minimizing product loss while ensuring a clean and environmentally friendly workplace.

3. Flexible adjustment; uniform drying: The drying process can be precisely controlled through multiple parameters, including main shaft rotation speed, material layer thickness, heating medium temperature and flow rate, rake structure and quantity, and the number of effective drying discs, thus ensuring stable and uniform product quality.

4. Reliable operation; long service life: The equipment features a robust structure, stable operation, easy maintenance, low failure rate, and long service life.

5. Unidirectional flow; consistent quality: Material moves along a "plug flow" trajectory on the drying discs, eliminating back-mixing. This ensures excellent drying uniformity without the need for subsequent blending processes.

6. Integrated drying and cooling; precise temperature control: Each drying disc layer can be independently supplied with heating medium (steam/thermal energy).