In modern copper metallurgy, electrolytic refining is a crucial process for converting crude copper from pyrometallurgical refining into high-purity cathode copper. As the power core of this electrochemical process, the rectifier plays a critical role in converting AC into stable DC, directly determining the purity, yield, and energy consumption of electrolytic copper.

I. Core Functions and Technical Requirements of Rectifiers

1.Power Conversion and Supply

The primary function of the rectifier is to convert the three-phase AC power (typically 380V or high-voltage 6kV/10kV) supplied by the power grid into the low-voltage, high-current DC power required for the electrolysis process. Typical copper electrolysis rectifier output parameters are: voltage 1.5V-2.5V (single cell) to tens of volts (multiple cells in series), current 10kA to 50kA or even higher.

Modern copper electrolysis workshops typically use hundreds of electrolytic cells connected in series to form a series; the rectifier must provide a stable DC power supply for the entire series. For example, a series containing 144 electrolytic cells, with a design current density of 270A/m², can reach a total current of 21,330A, requiring a rectifier rated capacity of 1260kW (60V/21kA).

2.Precise Process Control

The rectifier is not only a power supply but also the core execution unit for process control:

• Constant current/constant voltage control
• Dynamic adjustment capability
• Multi-pulse rectification technology

II. Rectifier Technology Evolution and Solution Selection

1.Traditional SCR Rectifier

SCR rectifiers, with their mature technology and high reliability, remain the mainstream choice in the copper electrolysis industry. They achieve voltage regulation through phase control and feature strong overload capacity and adaptability to harsh industrial environments. Modern SCR rectifiers can achieve efficiencies of over 98% and are equipped with comprehensive protection functions (overcurrent, overvoltage, short circuit, phase loss, overheating, etc.).

2.Modern IGBT High-Frequency Switching Power Supplies

With the development of power electronics technology, IGBT-based switching power supply rectifiers are gradually being applied in the copper electrolysis field. Compared with traditional SCR solutions, IGBT rectifiers have significant advantages, achieving true uninterrupted operation—even if a single power module fails, the remaining modules can still maintain production, greatly improving system availability.

III. Direct Impact of Rectifiers on Production Efficiency

The technical level of the rectifier is directly related to the core economic indicators of copper electrolytic refining:

• Product Quality: The stability of current density and voltage determines the density and surface quality of cathode copper crystals, affecting whether the final product can meet LME standards. Grade A copper standard (Cu ≥ 99.99%).
• Energy Costs: DC power consumption is the main energy cost of copper electrolysis. Based on the deposition of one ton of copper, DC power consumption is approximately 250-280 kWh. For a refinery with an annual production capacity of 100,000 tons, a 1% increase in rectifier efficiency can result in annual power savings of over 250,000 kWh.
• Precious Metal Recovery: By precisely controlling the potential, the enrichment rate of gold and silver in the anode mud can be maximized, and the value of by-products often exceeds the profit of the main product.
• Capacity Utilization: Highly reliable rectifiers ensure equipment operating rates and reduce production losses due to unplanned downtime.

Liyuan Haina has been cultivating the high-power rectifier field for many years, providing a full range of electrolysis rectifier solutions from 10kA to 60kA+ to numerous copper smelting companies both domestically and internationally. Our products utilize advanced digital control technology and reliable power devices, maintaining excellent performance even in extreme industrial environments, helping customers achieve efficient production of high-quality cathode copper.

Contact us to obtain a rectifier solution tailored to your copper electrolysis process.