1. Material Overview

Nickel sulfate exists in three forms: anhydrous, hexahydrate, and heptahydrate. The commercial product is mostly hexahydrate, which has two polymorphs: α-type (blue tetragonal crystals) and β-type (green monoclinic crystals). When heated to 103°C, it loses six molecules of crystallization water. It is easily soluble in water, slightly soluble in ethanol and methanol, and its aqueous solution is acidic. It is slightly soluble in acid and ammonia water and is toxic. Nickel sulfate is mainly used in the electroplating industry, pharmaceutical industry, inorganic industry, and dyeing industry.

2. Nickel Sulfate Dryer Overview

The material to be dried this time is nickel sulfate, which has strong acidity and corrosiveness. In response to these characteristics, our company has upgraded and improved the equipment manufacturing process. The upper and lower boxes of the vibrating fluidized bed, as well as the inner walls, are fully lined with 3mm fiberglass. The vibrating plate is made with special nickel-plated punched duckbill holes. The exhaust emissions are entirely made of high-temperature and corrosion-resistant fiberglass materials. The support frame and support pipes are also specially made of carbon steel Teflon material. To achieve optimal emission results, the bag filter bags are made of special materials that are extremely acid-resistant, and the induced draft fan with frequency conversion air adjustment is also made of FRP. This process effectively addresses the challenges of high temperature and high corrosion encountered during the material drying process.

 3. Principle of Nickel Sulfate Dryer

The material enters the machine through the feed port and advances by jumping on the air distribution plate under the excitation force provided by the vibration motor or other means. Simultaneously, the air is filtered and heated to a certain temperature, entering the lower wind chamber of the dryer through the air inlet. Under the dual action of the vibration force and the hot airflow evenly distributed by the air distribution plate, the material contacts the hot airflow in a suspended state. Intense turbulence occurs between the material particles and the hot medium, enhancing the heat and mass transfer process. The dried product is discharged from the outlet, and the evaporated moisture and exhaust gases are discharged into the atmosphere after the dust is recovered by the cyclone separator. The lower bed body provides a stable wind chamber with a certain pressure for the bed layer. By adjusting the induced draft fan, the upper part of the material in the bed layer of the upper box maintains a slight negative pressure, ensuring a good drying environment and preventing dust leakage.

4. Features of Nickel Sulfate Dryer

1. The material is heated evenly, with sufficient heat exchange and high drying intensity, saving about 30% energy compared to ordinary dryers. The vibration source is driven by a vibration motor, providing balanced operation, convenient maintenance, low noise, and long life. The fluidization is stable, with no dead corners or blow-through phenomena. It causes little surface damage to the material, making it suitable for drying fragile materials, and it is effective even if the material particles are irregular.

2. The fully enclosed structure effectively prevents cross-contamination between the material and the air, ensuring a clean working environment. It has good adjustability and a wide range of adaptability, with the thickness of the material layer, the movement speed within the machine, and the amplitude all capable of stepless adjustment.

3. The application of vibration reduces the minimum fluidizing gas velocity, significantly reducing the air demand, and thereby lowering the dust layer entrainment. The size of supporting equipment such as heat sources, fans, and cyclone separators can be correspondingly reduced, resulting in cost savings and noticeable energy efficiency. The residence time within the machine can be easily changed by adjusting the vibration parameters. The piston flow operation reduces the requirements for material particle uniformity and regularity, making it easier to obtain uniformly dried products.