High-Temp & Pressure Desorption Electrowinning System
High-Temp & Pressure Desorption Electrowinning System — A One-Stop Solution From Gold-Loaded Carbon to High-Purity Gold Sludge
✦ Desorption rate ≥ 96%; electrowinning rate 99%.
✦ Cyanide-free and eco-friendly; low energy consumption.
✦ 500KG capacity, automatic control.
What Is High-Temp & Pressure Desorption Electrowinning System
The high-temp & pressure desorption electrowinning system, also known as the high-pressure thermal gold electrolysis unit or HTHP carbon stripping and recovery system, is a core cyanide-free leaching electrolysis device used in gold beneficiation plants to extract gold mud from gold-bearing carbon. It mainly utilizes a closed, high-temperature (150℃) and high-pressure (0.5 MPa) environment to efficiently desorb gold from gold-loaded activated carbon, and then reduces it to high-grade solid gold mud through electrolytic deposition.
This HTHP system serves as the critical link in the gold cyanidation process (CIL/CIP) for converting gold-loaded carbon into gold sludge, and is also a key gold extraction equipment that determines the recovery rate and production efficiency. Compared to normal-temperature and pressure systems, the high-efficiency HTHP electrowinning unit boosts recovery efficiency by 30%–50% and shortens the electrolysis cycle by 60%; furthermore, it is capable of processing activated carbon with high impurity loads, making it well-suited for large-scale gold processing plants.
Key Highlights Of High-Temp & Pressure Desorption Electrowinning System:
- Desorption rate 96%+; recovery 99%, minimal residual gold.
- Processing time is only 8–12 hours—a 50%–70% reduction compared to conventional systems.
- Power consumption is just one-quarter of conventional systems, significantly lowering operating costs.
- Fully automated control supports safe, unattended operation.
- No sodium cyanide added to the desorption solution; safe and environmentally friendly.
- Corrosion-resistant design; withstands harsh environments involving strong acids.
- Triple safety protection: intelligent control, automatic pressure-limiting mechanism, and safety relief valve.
- High-grade gold sludge output; suitable for direct smelting without reverse electrowinning.
Application Scenarios
- Gold CIL/CIP Plants: Efficiently desorbs and recovers gold from gold-loaded carbon; serves as the core final recovery step in the carbon-in-leach/pulp process.
- Heap Leaching Projects: Processes low-grade gold-loaded carbon produced from heap leaching operations, achieving efficient gold enrichment and recovery.
- Gold Concentrate Cyanidation Plants: Works in conjunction with cyanidation leaching processes to convert gold-loaded carbon (post-leaching) into high-grade gold sludge.
- Refractory Gold Projects: Pairs with pre-oxidation processes to handle complex gold-loaded carbon containing high levels of silver, copper, or calcium.
- Mine Expansion and Upgrading: Replaces traditional ambient-temperature/pressure desorption systems to increase processing capacity to the 1,000–5,000 t/d range and improve recovery rates.
Main Equipment And Function Of High-Temp & Pressure Desorption Electrowinning System
| No. | Equipment | Qty (Set) | Function |
|---|---|---|---|
| 1 | Electrolytic Tank | 1 | Reduces gold ions in the pregnant solution to solid gold mud under DC electric field. |
| 2 | Desorption Column | 1 | Holds loaded carbon, completes gold desorption under high temp & pressure. |
| 3 | Filter | 2 | Filters carbon fines and impurities from the pregnant solution to protect the electrolytic cell. |
| 4 | Electric Heater | 2 | Rapidly heats to 150℃, thermal efficiency above 90%. |
| 5 | Desorption Solution Tank | 1 | Prepares and stores NaOH desorption solution for recycling. |
| 6 | Carbon Storage Tank | 1 | Buffers loaded carbon and stripped carbon. |
| 7 | Acid Storage Tank | 2 | Stores hydrochloric acid for acid washing of loaded carbon. |
| 8 | Acid Cleaning Tank | 1 | Removes carbonate impurities from loaded carbon to improve desorption efficiency. |
| 9 | Carbon Transporting Pump | 2 | Hydraulically conveys loaded carbon and stripped carbon for closed-loop circulation. |
| 10 | Clean Water Pump | 1 | Supplies clean water for system cleaning and solution preparation. |
| 11 | Magnetic Pump | 1 | Corrosion-resistant acid pumping for acid washing. |
| 12 | Circulating Pump | 2 | Drives desorption solution in closed-loop circulation. |
| 13 | Power Control Cabinet | 1 | Centralized control of start/stop, temperature, pressure, and liquid level. |
| 14 | Air Compressor | 1 | Provides 0.5MPa working pressure to maintain system stability. |
| 15 | Rectifier Cabinet | 1 | Converts AC to DC power for the electrolytic tank. |
| 16 | Pipeline & Valve | 1 | High-temp & high-pressure piping system and control valves connecting all equipment. |
| 17 | Instrument & Meter | 1 | Includes temperature sensors, pressure gauges, level meters, flow meters, etc. |
How does it work?
The system operates based on a three-step process: “competitive ion displacement + electrolytic deposition + cyclic regeneration.”
- Desorption: Within a high-temperature, high-pressure closed-loop system, a high-concentration NaOH eluent is introduced to the gold-loaded carbon. Utilizing the mechanism of competitive anion adsorption, Au(CN)₂⁻ gold complex ions adsorbed within the activated carbon pores are forcefully displaced and eluted, yielding a gold-rich pregnant solution.
- Electrowinning stage: The precious liquid enters the pressurized electrolytic cell. Under the action of a DC electric field (voltage 2-4V, current 350-750A), gold ions gain electrons at the cathode and are reduced to metallic gold atoms, which are deposited on the cathode surface to form gold mud.
- Circulation System: The barren solution and the stripped carbon are recycled via pump assemblies, thereby reducing energy and reagent consumption.
why choose JXSC High-Temp & Pressure Desorption Electrowinning System
features & Advantages
√ Exceptionally high desorption rate: ≥96% under operating conditions of 150°C and 0.5 MPa—a significant improvement over atmospheric-pressure systems.
√ Rapid processing: 8–12 hours per batch; equipment turnover rate is 3–4 times that of atmospheric-pressure systems.
√ Reduced energy consumption: Desorption and electrolysis operate at the same temperature, eliminating the need for heat exchange; power consumption is only one-quarter that of atmospheric-pressure systems.
√ Cyanide-free and eco-friendly: The desorption solution contains no sodium cyanide and produces no highly toxic emissions, facilitating easier environmental regulatory approval.
√ High-grade output: Produces high-purity gold sludge, eliminating the need for reverse electrolysis and shortening the smelting process.
√ Dual regeneration benefits: Desorption reagents include a carbon activator, eliminating the need for thermal regeneration of barren carbon; this saves regeneration costs and extends carbon lifespan.
√ Intelligent control: Features PLC automation and one-touch start/stop functionality, reducing manual labor while ensuring stable, reliable operation.
√ Triple-redundancy safety: Combines intelligent protection, automatic pressure relief, and safety valves to guarantee absolute safety in high-pressure environments.
models & specifications
| Parameter | Value |
| Type | High Temperature High Pressure type |
| Starting Temperature of Electrolysis | 100 — 110℃ |
| Electrolytic Termination Temperature | 150℃ |
| Pressure | 0.5 Mpa |
| Process Time | 8 — 12 hours |
| Desorption Rate | > 96% |
| Electrolysis Rate | > 99% |
| Electrolysis Voltage | 2 — 4V (DC) |
| Electrolysis Current | 350 — 750A |
| Process Capacity | 500 kg /batch |
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