GAOHUI Heavy Duty Metal Electrowinning Rectifier (12V 4000A) – Sealed Water-Cooled

Executive Summary
This is not an off-the-shelf general purpose power supply. This is a 12 Volt 4000 Ampere direct current system engineered specifically to survive and perform within the severe chemical environment of a metal electrowinning cell. Where standard units fail due to acid mist corrosion, this rectifier actively repels it. Built by an industrial high frequency rectifier factory with two decades of hydrometallurgy experience, this unit delivers ripple-free DC for efficient, high-yield metal recovery in copper, zinc, nickel, and silver operations. You are investing in uptime, not a $50 eBay variable supply that will fail in three weeks.
Part 1 Key Features & Engineering Highlights
SEALED WATER-COOLED ENCLOSURE: Unlike fan-cooled units that suck in corrosive sulfurous acid mist, this enclosure is completely sealed. Heat is transferred through an internal deionized water loop to an external heat exchanger. The electronics never touch plant air.
FULL EPOXY-COATED BUS BARS: Raw copper is porous and corrodes. Every bus bar in this unit is coated with a heavy-duty industrial epoxy, providing an impenetrable barrier against the hot sulfuric acid atmosphere common in electrowinning tanks.
IGBT SWITCHING TECHNOLOGY: Based on superior IGBT modules, this system achieves greater than 90% efficiency at full load. As an IGBT rectifier manufacturer, GAOHUI ensures precise PWM control for exceptional current stability, directly improving your metal deposit quality and reducing energy waste.
HIGH RIPPLE REJECTION: Output ripple is below 2% RMS. This is critical for electrowinning where high ripple causes poor cathode morphology and redeposits metal back into the solution, killing your current efficiency.
Part 2 Technical Specifications Table

Part 3 Advanced Built-in Protection Systems
This unit is deployed in a hostile environment. It protects itself so you don’t have to empty the cell. Standard protections include overcurrent, overvoltage, over-temperature for both the IGBT and the coolant, phase loss, and short circuit. The sealed water cooling system also includes a flow switch interlock. If the water pump fails or a line breaks, the rectifier instantly shuts down to prevent catastrophic thermal damage. This is the level of engineering you get when you ask for a reliable heavy-duty DC power supply price that matches real duty cycles, not a disposable unit.
Part 4 Target Industrial Applications
METAL ELECTROWINNING SYSTEM: Designed as the primary DC power source for electrowinning cells in the mining and refining industry. Ideal for copper, zinc, nickel, and cobalt recovery from pregnant leach solutions.
HYDROMETALLURGY TANKS: Perfect for high-impurity solutions where equipment must resist acid, chlorine, and high humidity.
METAL RECOVERY SYSTEM: Optimized for secondary recovery of precious metals including silver, gold, and platinum from scrap solutions or spent plating baths.
Part 5 Customization and Tailored Engineering Services
GAOHUI does not force fit a generic unit into your process. As a dedicated custom current voltage rectifier manufacturer, we offer full parameter customization to match your cell chemistry and bus configuration.
FACTORY CUSTOM CAPABILITY: Voltage range from 1V to 1000V. Current range from 1A to 100,000A. Input is AC only. Output is DC only.
OPTIONAL CONTROL MODULES AVAILABLE FOR INTEGRATION:
Process Timer: Set and monitor batch operation durations for automatic cycle completion.
Multi-Stage Profile Control: Program specific voltage or current ramps for nucleation and growth phases.
Ampere-Minute Integrator: Track total charge passed for precise metal thickness or recovery mass logging.
Automatic Reverse Polarity: For periodic current reversal to deburr cathodes or strip anode films.
Soft-Start: Reduce stress on tank house transformers and bus connections during startup.
Advanced Interfaces: Full RS485 Modbus RTU, Standard Ethernet TCP/IP, 4-20mA analog control.
Pulse Functions: Adjustable pulse output from 1 Hz to 3000 Hz for granular control over crystal morphology in high-purity recovery.
We will engineer the exact DC output profile your hydrometallurgy process requires. Contact GAOHUI for a quote tailored to your current voltage rectifier needs.