Stearate drying
Stearate drying is an industrial process critical for producing free-flowing powders of metal stearates (e.g., magnesium, calcium, zinc, or aluminum stearate). Common Drying Method: Flash Dryer
Stearate drying is an industrial process critical for producing free-flowing powders of metal stearates (e.g., magnesium, calcium, zinc, or aluminum stearate). These compounds—widely used as lubricants, anti-caking agents, stabilizers, and release agents in plastics, pharmaceuticals, cosmetics, and food—require precise moisture control to ensure functionality, shelf stability, and ease of handling.
Critical Challenges
Low Melting Points: Magnesium stearate melts at ~88°C; drying must stay below 80°C.
Static Electricity: Dry stearates generate sparks → explosion/fire hazard (requires inert gas/Nā).
Hygroscopicity: Absorbs moisture post-drying → strict packaging needed.
Plastification: Overheating turns powder into a waxy mass ("case hardening").
Quality Control Parameters
Moisture Content: Target: 0.1–2% (varies by application).
Particle Size: 5–50 μm (ensures consistent dispersion).
Flowability: Measured by angle of repose (<40° ideal).
Residual Solvents: <100 ppm (pharma/cosmetics grades).
Common Drying Method:
Flash Dryer :
High-Efficiency Drying Mechanism: XSG Series Spin Flash Dryer employs a tangential air inlet and a high-speed stirrer to create a powerful rotating wind field. This ensures efficient heat transfer and uniform drying of paste, cake, and slurry materials.
Advanced Material Processing: The equipment processes raw materials through a combination of cutting, shearing, blowing, floating, and rotating actions, transforming them into granulated form. This enhances material separation and strengthens the heating exchange process.
