Permanent Drum Magnetic Separator

The permanent drum magnetic separator utilizes high-intensity NdFeB magnets mounted in a fixed position inside a rotating non-magnetic drum. As material flows over the drum surface, magnetic particles are attracted to the drum and held against the rotation until they exit the magnetic field zone. The magnetic particles are then carried further around the drum and discharged separately from non-magnetic particles, which fall naturally under gravity. This process creates distinct streams of magnetic concentrate and non-magnetic tailings without requiring electricity to generate the magnetic field.

Permanent magnetic drums offer several key advantages: 1) Significantly lower energy consumption, as no electricity is required to generate the magnetic field; 2) Consistent magnetic field strength without fluctuations or risk of power failure; 3) Lower maintenance costs with no cooling requirements or electromagnetic coil repairs; 4) Simplified operation without field current adjustments; 5) Higher safety profile without risks associated with electrical systems; 6) Lower operating temperatures improving longevity; 7) Lighter weight and more compact design. These benefits make permanent magnetic separators more economical over their operational lifetime despite a potentially higher initial investment.

The CTB series effectively processes ferromagnetic and paramagnetic materials, including: 1) Iron ores such as magnetite, hematite, and limonite; 2) Manganese ores with magnetic properties; 3) Ilmenite and other titanium-bearing minerals; 4) Coal with magnetic impurities; 5) Industrial minerals requiring iron removal; 6) Recycling materials containing ferrous components. The separators handle dry or wet feed with particle sizes from 0-3mm and moisture content up to 15%, making them versatile for various mineral processing applications where magnetic susceptibility differences can be exploited.

Model selection depends on several factors: 1) Required processing capacity - match expected throughput with model specifications; 2) Material characteristics - consider particle size, magnetic susceptibility, and moisture content; 3) Feed composition - analyze the percentage of magnetic particles expected; 4) Desired recovery and grade targets; 5) Installation constraints - evaluate available space and existing plant configuration; 6) Operational conditions - consider ambient temperature and humidity. Our engineering team provides comprehensive material testing services to recommend the optimal model and configuration for your specific requirements, ensuring maximum performance and return on investment.

Recommended maintenance includes: 1) Daily visual inspection of the drum surface and discharge points; 2) Weekly checking of drive system components and belt tension; 3) Monthly lubrication of bearings according to the schedule; 4) Quarterly inspection of drum seals and magnetic system integrity; 5) Semi-annual cleaning of the drum surface if processing dry materials; 6) Annual comprehensive inspection of all mechanical components. The permanent magnets require no maintenance and retain their magnetic properties for 15-20 years under normal operating conditions. Most operations report maintenance requirements of approximately 2-4 hours monthly, significantly less than electromagnetic alternatives.

Drum diameter influences separation performance in several ways: 1) Larger diameters provide greater magnetic field exposure time, improving recovery of weakly magnetic particles; 2) Increased diameter creates a larger working surface area, allowing for higher throughput capacity; 3) Larger drums generate more gradual magnetic force transitions, improving selectivity in some applications; 4) Different diameters are optimal for specific particle size ranges and magnetic susceptibilities. Generally, larger diameter drums (1050-1500mm) are preferred for finer materials and weakly magnetic ores, while smaller diameters (600-900mm) work effectively for strongly magnetic materials and coarser particles.

Yes, CTB series separators effectively handle wet material processing with several features addressing moisture challenges: 1) Corrosion-resistant drum surfaces suitable for slurry applications; 2) Special sealing systems that protect internal magnetic components from moisture exposure; 3) Drainage systems to manage excess water; 4) Optimized drum profiles that resist material buildup in wet conditions. The equipment processes material with moisture content up to 15% without performance degradation and can be configured for full slurry applications with appropriate tank designs. For high-slurry applications above 15% moisture, we recommend specialized wet drum configurations with adapted feed and discharge systems.

Key factors influencing separation efficiency include: 1) Magnetic field intensity and gradient - affects the selective capture of particles with different magnetic susceptibilities; 2) Drum rotation speed - impacts the balance between gravitational and magnetic forces; 3) Layer thickness on the drum - thinner layers typically yield better selectivity; 4) Feed rate consistency - uniform feed improves separation precision; 5) Particle size distribution - finer particles generally require stronger fields or slower drum speeds; 6) Moisture content - excessive moisture can increase viscous drag and affect separation; 7) Splitter position adjustment - critical for defining the cut point between magnetic and non-magnetic fractions; 8) Feed material liberation - proper grinding ensures magnetic minerals are sufficiently liberated from gangue.