Davis Tube Magnetic Separator Laboratory Magnetic Content Tester for Heavy Medium Mineral Analysis

Product Overview

This Davis tube magnetic separator is a specialized laboratory analytical instrument engineered for the precise determination of magnetic material content in ferromagnetic powders and metallurgical process streams. Designed to establish empirical separation benchmarks, the equipment isolates strongly magnetic fractions from non-magnetic gangue under tightly controlled hydrodynamic and electromagnetic conditions.

Widely deployed across dense medium coal preparation plants, mining assay laboratories, and geological institutes, this unit evaluates commercial magnetite purity and audits dense medium recovery circuits. It serves as an essential quality control apparatus for monitoring media loss per ton of clean coal and guiding plant-scale separation parameters.

Built with a heavy-duty vibration-damped chassis and advanced wireless online field-regulation technology, this system delivers uncompromising analytical consistency across demanding multi-shift testing cycles. Operations rely on this robust equipment for highly repeatable data that protects processing efficiency and supports strict environmental compliance.

Key Features

• Stepless Online Magnetic Field Regulation: Designed with advanced wireless control circuitry, the system empowers laboratory technicians to continuously adjust magnetic flux density from 0 up to 350 mT in real time. This capability eliminates the need to halt test runs or perform manual coil reconfigurations, allowing smooth, progressive magnetic sweeps for multi-phase mineral characterization.
• Optimized 52 mm Electromagnetic Air Gap: The high-permeability pole shoes are precision-machined to maintain an exact 52 mm gap clearance, producing an intense and uniform magnetic field gradient across the full working zone. This geometry prevents uncaptured particulate slip and ensures maximum recovery of fine ferromagnetic fractions.
• Harmonic Dual-Motion Mechanical Agitation: Driven by a calibrated electromechanical linkage operating at a steady oscillation frequency of 1.17 Hz and a fixed 40 mm stroke length, this unit imparts fluid agitation that dislodges entrained non-magnetic gangue from the magnetic concentrate bed without causing premature particle detachment.
• Standardized Φ50 mm Borosilicate Glass Separation Column: Featuring optical-grade, heavy-walled borosilicate glass, the standardized 50 mm diameter separation tube provides superior thermal and chemical resistance. Its exceptional clarity allows operators to visually observe slurry dispersion, flocculation dynamics, and rinse water clarity during active testing.
• Fine Particulate Sizing Compatibility (< 0.5 mm): Specifically engineered to process finely ground feed samples below 0.5 mm in particle size, the fluid dynamics and field geometry mitigate particle agglomeration, providing representative assay results even when handling ultra-fine magnetite powders.
• Structural Cast-Iron Vibration-Damping Base: Built upon an integrated 200 kg heavy-duty cast frame, the equipment absorbs the dynamic inertial forces generated by continuous mechanical reciprocation. This structural stability maintains precise air gap tolerances and safeguards internal electronics over years of continuous laboratory operation.
• Efficient 0.25 kW Continuous-Duty Drive Motor: Powered by a commercial 0.25 kW electric motor compatible with standard AC 380V three-phase electrical connections, the drive assembly delivers sustained, smooth oscillation while maintaining low operating temperatures, minimal electrical consumption, and quiet running decibels.
• Streamlined Hydrodynamic Washing Circuit: Equipped with precision-engineered fluid ports, the assembly facilitates uniform water distribution through the slurry column, enabling thorough wash-out of non-magnetic impurities and rapid recovery of purified magnetic concentrates.

Applications

Laboratory Davis tube magnetic testers provide standard analytical verification across mineral processing operations where ferromagnetic recovery efficiency and media purity dictate daily operational margins.

In heavy medium coal preparation facilities, the accurate quantification of magnetite recovery efficiency is a primary driver of plant profitability. Dense medium separation relies entirely on maintaining a stable suspension density; any uncontrolled loss or contamination of magnetite directly leads to misplaced clean coal in the refuse stream or high-ash contamination in clean product silos. By simulating commercial magnetic separation on an analytical scale, this equipment gives metallurgists precise control over washability curves, enabling predictive adjustment of plant-wide magnetic recovery drums and desliming screens.

Technical Specifications

The table below outlines the complete mechanical, electrical, and operational parameters for the standardized laboratory magnetic separator tube.

Separation Mechanism and Field Dynamics

The mechanical and electromagnetic architecture of the system is designed to simulate true selective separation. Two high-permeability electromagnetic pole shoes face each other across a calibrated 52 mm gap, concentrating flux lines directly across the center of the Φ50 mm borosilicate glass tube. When an ore or media sample is introduced with rinse water, the wireless stepless controller permits fine regulation of field intensity up to 350 mT. Strongly ferromagnetic particles are captured and held against the tube wall at the point of maximum flux gradient, while non-magnetic minerals remain in suspension and are swept downward by gravitational and hydrodynamic wash forces.

Operational Oscillation and Rinse Synchronization

Simultaneously, the electromechanical drive imparts a steady 1.17 Hz reciprocating motion with a 40 mm travel stroke. This rhythmic oscillation prevents fine mineral beds from packing densely, allowing continuous water flow to rinse away entrapped slime and weakly magnetic silicate impurities. Once the washing effluent runs completely clear, the magnetic field is deactivated or the tube is removed to flush the high-purity magnetic fraction into an evaporating dish for drying, weighing, and calculation of the magnetic percentage.

Why Choose This Product

• Wireless Online Field Control: Incorporating state-of-the-art wireless stepless magnetic field regulation, the system eliminates mechanical downtime and allows operators to adjust field strength up to 350 mT smoothly during active tests, significantly increasing daily sample throughput.
• Exceptional Mechanical Stability: Weighing 200 kg with an ultra-rigid cast chassis, this unit dampens reciprocating vibrations, eliminating physical movement across the bench or floor, which prevents uneven pole-gap wear and guarantees consistent mechanical alignment.
• Uncompromising Analytical Precision: With an exact 52 mm air gap, calibrated 1.17 Hz harmonic agitation, and standard Φ50 mm column geometry, the apparatus ensures laboratory-to-laboratory reproducibility and seamless correlation with standardized test protocols.
• Rugged Heavy Industrial Build: Engineered specifically for the demanding environment of mine-site assay rooms and coal washeries, the corrosion-resistant finishes, protected electrical components, and heavy-walled borosilicate glass resist harsh wash conditions.
• Comprehensive Technical Support & Consumables: Backed by specialized engineering expertise, complete maintenance documentation, and global parts availability—including precision replacement separation tubes and seals.

Contact our laboratory equipment specialists today to request a quotation or discuss how this advanced Davis tube magnetic separator can enhance your analytical accuracy.

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