Davis Tube Magnetic Separator Davis Analysis Tube for Mineral Separation

Product Overview

The Davis tube magnetic separator is a specialized laboratory instrument designed for the exact separation and quantitative determination of ferromagnetic components within mineral ores, industrial powders, and metallurgical slurries. Operating through controlled magnetohydrodynamic separation, this system subjects prepared pulp to a continuously adjustable electromagnetic field while applying synchronized mechanical agitation and continuous fluid flushing. Ferromagnetic particles are magnetically immobilized against the interior wall of a precision glass tube, while non-magnetic and weakly paramagnetic mineral gangue is flushed away by a regulated laminar water flow, providing clean, distinct separation fractions for quantitative analysis.

Widely utilized across coal preparation facilities, mining assay laboratories, metallurgy centers, and geological survey institutes, this equipment serves as an industry standard for characterizing ore dressability and grading commercial magnetic media. The system plays an indispensable role in verifying magnetite powder quality for dense medium cyclone operations, performing iron ore concentration assays, and evaluating residual value in industrial tailings. By generating highly repeatable quantitative ratios between magnetic and non-magnetic phases, the unit enables mineral processing engineers to optimize large-scale commercial magnetic separators with scientific confidence.

Constructed on an integrated heavy-duty mobile cart chassis, the equipment combines the electromagnet assembly, glass tube support cradle, mechanical drive motor, integrated water tank with fluidic manifold, and microcomputer controller into a self-contained operational footprint. Each system undergoes rigorous magnetic flux calibration and mechanical verification prior to factory dispatch, ensuring strict conformity with standard testing specifications such as GB/T 18711-2002 and enabling immediate operational deployment without extensive field calibration.

Key Features

• Stepless Electromagnetic Field Modulation (0 to 3000 mT): Built with high-purity copper windings and a low-loss electromagnetic core, this system delivers smoothly adjustable magnetic field intensity from 0 to 3000 mT. This extensive dynamic range allows operators to determine the precise magnetic susceptibility thresholds required to separate diverse mineral complexes, ranging from strongly magnetic magnetite to weakly magnetic artificially roasted iron ores.
• Optimized 52 mm Pole Gap Geometry: The electromagnetic pole pieces are precision-machined with a uniform 52 mm pole gap, focusing maximum magnetic field concentration directly across the central diameter of the separation tube. This geometry ensures exceptional flux homogeneity across the working volume, preventing sample drop-off and eliminating flux distortion during dynamic stroke cycles.
• Synchronized Reciprocating Agitation Mechanics: Incorporating a mechanical linkage drive, the cradle translates the separation tube through a 40 mm linear stroke at a pre-set frequency of 70 cycles per minute along a fixed 45-degree inclination angle. This continuous combined motion generates gentle hydrodynamic fluidization within the slurry bed, releasing entrapped non-magnetic particles from the magnetic floccules without disrupting magnetic immobilization.
• Integrated Wheeled Mobile Cart Architecture: Designed to eliminate benchtop clutter and multi-component assembly, the system houses all drive components, fluid reservoirs, electronics, and magnetic coils within a robust, powder-coated mobile cabinet equipped with lockable swivel casters. An integrated lower compartment provides protected onboard storage for spare glassware, calibration weights, and wash hoses.
• Closed-Loop Fluidics and Internal Water Reservoir: Featuring an integrated storage tank connected to an onboard fluid delivery and drainage manifold, the equipment provides stable, pulse-free wash water at controlled flow velocities. This self-contained fluid architecture removes the need for permanent facility plumbing connections while guaranteeing uniform hydrostatic pressure across consecutive test batches.
• Centralized Microcomputer Digital Control: An intuitive digital control panel provides precise management over coil excitation, stroke agitation, and system power. Microprocessor-stabilized excitation circuitry prevents magnetic flux drift caused by coil heating during extended test sequences, maintaining consistent separation standards throughout continuous operating shifts.
• Factory-Calibrated Compliance with Standard GB/T 18711-2002: Every unit undergoes multi-point magnetic flux mapping and mechanical stroke verification prior to shipment, fully aligning with the rigorous requirements of GB/T 18711-2002 for magnetite powder used in coal preparation. Laboratories achieve certified, audit-ready data straight from the crate without complex mechanical setup.
• Durable Borosilicate Glass Tube and Heavy-Duty Drive: Engineered for rigorous daily throughput in production assay environments, the mechanical drive utilizes an industrial gear motor and hardened eccentric linkages that resist mechanical wear. The sample zone uses heavy-wall, precision-ground borosilicate glass tubes that offer excellent optical clarity and resistance against abrasive mineral slurries.

Applications

In practical laboratory workflows, the equipment facilitates standardized slurry testing protocols. Operators prepare a measured representative sample, typically between 10 and 20 grams of pulverized mineral ore or magnetite powder milled to the target liberation size. The mineral charge is suspended in water to form a uniform slurry and introduced into the pre-wetted borosilicate separation tube. As the slurry enters the active magnetic field zone between the pole pieces, the stepless electromagnet captures the susceptible ferromagnetic particles along the tube wall.

During this retention stage, the mechanical drive engages to translate and rock the tube at 70 cycles per minute through a 40 mm stroke. Simultaneously, clean water from the internal reservoir flows down through the tube at a calibrated rate. This fluid dynamics wash stream displaces mechanically trapped gangue, clay particles, and silica out through the bottom drainage port into a collection beaker. Once the discharge runs completely clear, indicating total gangue removal, the operator halts agitation, switches off the magnetic field, and collects the purified magnetic fraction. Both separated fractions are subsequently filtered, dried, and weighed to compute exact mass yields and metallurgical recoveries.

Technical Specifications

The mechanical and electrical sub-assemblies of the unit are engineered to provide maximum operational stability under continuous laboratory operation. The 52 mm pole gap is rigidly braced across a precision-machined yoke assembly, ensuring zero deflection of the magnetic gap under peak magnetic field forces. The excitation system incorporates solid-state rectification with thermal compensation, maintaining steady flux density within ±1% of the target setpoint even during extended test campaigns. The integrated water management system eliminates fluctuating mains water pressures by utilizing a steady onboard reservoir head, ensuring that hydrodynamic wash velocities remain identical from test to test.

Why Choose This Product

• Factory-Calibrated Plug-and-Play Precision: Every system arrives fully assembled, aligned, and calibrated against certified gaussmeter standards at the factory. Unlike disaggregated laboratory setups that require complex on-site mechanical alignment, pole gap setting, and field calibration, this unit is operational immediately upon arrival, guaranteeing compliance with GB/T 18711-2002 standards without costly commissioning delays.
• Broad 0 to 3000 mT Stepless Field Capability: Offering an exceptionally wide and continuously adjustable magnetic field up to 3000 mT, this analyzer covers the operational spectrum of low-intensity, medium-intensity, and high-intensity separation studies. Researchers can analyze highly magnetic magnetite media, moderately magnetic roasted ores, and synthetic ferromagnetic compounds on a single consolidated workstation.
• Ergonomic Self-Contained Mobile Workstation: The all-in-one cart architecture houses the electromagnetic yoke, water reservoir, fluidic valves, mechanical motor, and digital controller within a compact footprint. Heavy-duty lockable casters allow seamless transport between mineral preparation rooms and analytical labs, while the onboard storage cabinet protects sensitive glassware from accidental breakage.
• Hydrodynamic Agitation for Unrivaled Purity: The engineered 45-degree angle, 40 mm stroke, and 70 cycles per minute oscillation cycle generate optimal fluidization without disrupting magnetic capture. This dynamic prevents gangue entrainment within magnetic clusters, ensuring that assays achieve exceptional repeatability, high mass balance closure, and sharp fraction separation.
• Industrial Build Quality for Long-Term Durability: Constructed with a massive 220 kg reinforced steel chassis, precision-machined eccentric linkages, and corrosion-resistant powder coatings, the equipment delivers decades of reliable performance in demanding industrial and mining laboratory environments.

Contact our mineral processing technical team today to request a quotation, discuss custom voltage requirements, or discover how this advanced magnetic separator can bring speed, precision, and compliance to your analytical laboratory.

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