Rare Earth Smelting – 24V 4000A Heavy-Duty Electrolysis DC Rectifier

This high-frequency IGBT rectifier is designed exclusively for the extreme demands of rare earth molten salt electrolysis. Operating at peak efficiency above 90% at full load, it replaces legacy low-frequency SCR units with precise DC power delivery. This unit reduces the heavy carbon anode effect common in rare earth smelting, ensuring consistent electrolyte temperature and optimal current distribution across each cell. Sourced from an industrial high frequency rectifier factory, it minimizes harmonic distortion and maximizes uptime.
Part 1 Key Features & Engineering Highlights
MODULAR IGBT POWER STAGES: Utilizes advanced thyristor-free inverter technology with a switching frequency of 20-50kHz, delivering ripple-free DC current critical for quality rare earth metal deposition.
HIGH SYSTEM EFFICIENCY: Exceeds 90% across the full load range, reducing operational heat and electricity waste compared to traditional diode rectifiers.
SUPERIOR POWER FACTOR: Maintains a >0.95 power factor without external compensation, reducing demand charges and transformer loading.
CURRENT RIPPLE CONTROL: Less than 5% ripple at rated output, preventing unwanted fluctuations in the electrolytic bath that cause dendrite growth or irregular deposition.
TOUCHSCREEN HMI: Integrated 7-inch color display for real-time voltage, current, and energy consumption monitoring with fault logging.
IGBT rectifier manufacturer designed with liquid-cooled modular architecture to withstand continuous operation in heavy smelting environments.
Technical Specifications Table
| Parameter | Specification | Notes |
| — | — | — |
| Input Voltage | 3-Phase AC 380V ±10% 50Hz | Other voltages available on request |
| Output Voltage | 0–24V DC | Continuously adjustable |
| Output Current | 0–4000A DC | Stepless regulation |
| Switching Frequency | 20-50kHz | IGBT inverter stage |
| Full Load Efficiency | >90% | At rated 24V/4000A |
| Power Factor | >0.95 | Without PFC module |
| Ripple Factor | <5% RMS | Additional filtering optional |
| Cooling Method | Forced Air / Liquid Cooled | Ambient temp up to 50°C |
| Protection Class | IP21 (Indoor) | Higher IP ratings available |
| Regulation Accuracy | ±0.5% voltage; ±1% current | Digital PID control |
| Weight | ~180 kg | Single unit; no separate transformer |
Technical specifications are standard values. Precise numbers may vary based on final custom current voltage rectifier configuration.
Advanced Built-in Protection Systems
OVERVOLTAGE AND UNDERVOLTAGE: Automatic shutdown if input or output strays outside safe parameters, preventing cathode/anode damage.
OVERLOAD AND SHORT CIRCUIT: Instantaneous current foldback with automatic recovery. Redundant phase-loss detection guards against unbalanced three-phase power common in smelting plants.
THERMAL MONITORING: Dedicated sensors on IGBT modules and transformer core trigger controlled fan speed increase or system halt.
ARC SUPPRESSION: Solid-state switching eliminates contact arcing, a risk with contactor-based DC systems.
Target Industrial Applications
Rare Earth Electrolysis – Providing steady DC to molten fluoride-oxide baths for neodymium, praseodymium, samarium-cobalt, and dysprosium alloys.
Lithium Manganese Smelting – High-purity current for direct lithium extraction and manganese dioxide deposition.
Antimony Indium Extraction – Low voltage/high current profile ideal for recovering strategic metals from ores or electronic scrap.
Molten Salt Electrolysis – Suitable for magnesium, sodium, and aluminum production requiring surge-proof current handling.
Customization and Tailored Engineering Services
This unit serves as a base platform; the factory provides complete DC rectifier customization across a 1V-1000V and 1A-100,000A range. All units are designed for AC input and DC output only. You can configure the following:
Process Timer: Set specific electrolysis cycles with auto-ramp and shutdown sequences.
Multi-Stage Profile Control: Program up to 16-step voltage or current ramps (e.g. pre-heat, main electrolysis, finishing) stored in PLC memory.
Ampere-Minute Integrator: Track total charge delivered per batch for direct material yield estimation.
Automatic Reverse Polarity (ARP): Periodic current reversal to depolarize the bath and prevent anode passivation in smelting processes.
Soft-Start: Ramp output from 0 to target over user-defined time period of up to 120 seconds, preventing sudden thermal shock.
Interfaces: Standard RS485 Modbus RTU, optional Ethernet/IP, 4-20mA analog inputs for integration with plant-wide SCADA.
Pulse Functions: Adjustable pulse output from 1-3000Hz, duty cycle 1-99% for specialized electro-winning or pulse plating applications.
Enquire directly for heavy-duty DC power supply price and lead time for 24V/4000A configurations. We ship worldwide with full commissioning support.